{"id":20821,"date":"2026-10-31T07:56:07","date_gmt":"2026-10-31T04:26:07","guid":{"rendered":"https:\/\/artinazma.net\/?p=20821"},"modified":"2026-10-31T11:57:36","modified_gmt":"2026-10-31T08:27:36","slug":"spectrophotometer-guide-dr1900-dr6000-en","status":"publish","type":"post","link":"https:\/\/artinazma.net\/en\/spectrophotometer-guide-dr1900-dr6000-en\/","title":{"rendered":"How Spectrophotometers Work: Hach DR1900 and DR6000 Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"20821\" class=\"elementor elementor-20821 elementor-20807\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d00002d e-flex e-con-boxed wd-section-disabled e-con e-parent\" data-id=\"d00002d\" data-element_type=\"container\" data-e-type=\"container\" id=\"aa-spectro-en\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d000001 elementor-widget elementor-widget-html\" data-id=\"d000001\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>#aa-spectro-en{direction:ltr;min-width:0;width:100%}#aa-spectro-en .elementor-widget{min-width:0;max-width:100%}#aa-spectro-en .elementor-widget-text-editor{line-height:1.95;overflow-wrap:anywhere}#aa-spectro-en .elementor-image-caption{text-align:center;font-size:14px;line-height:1.7;margin-top:10px}#aa-spectro-en .aa-table-wrap{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}#aa-spectro-en table{width:100%;min-width:520px;border-collapse:collapse;margin:0 auto;float:none;direction:ltr}#aa-spectro-en th,#aa-spectro-en td{text-align:center;vertical-align:middle;padding:12px;border:1px solid #d9e2ea;white-space:normal}#aa-spectro-en th{background:#eef5f8}#aa-spectro-en img{height:auto;max-width:100%}#aa-spectro-en figcaption{text-align:center;line-height:1.7}#aa-spectro-en h2,#aa-spectro-en h3{text-align:left;direction:ltr;line-height:1.6}@media(max-width:767px){#aa-spectro-en{padding:0 12px}#aa-spectro-en .elementor-widget-text-editor{font-size:16px;line-height:1.9}#aa-spectro-en th,#aa-spectro-en td{padding:9px;font-size:14px}#aa-spectro-en .elementor-image-caption{font-size:13px}}<\/style>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000002 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000002\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>A spectrophotometer measures how much light passes through a sample at a selected wavelength and uses that measurement to determine absorbance. Absorbance can support a concentration result when the analytical method, sample preparation and calibration relationship are defined. The instrument does not identify every substance in a sample simply by measuring its colour.<\/p>\n<p>In water and wastewater laboratories, many spectrophotometric tests use reagents to form a coloured reaction product. Selecting an instrument therefore involves more than choosing a wavelength range. The method, sample cell, reagent system, expected concentration and measurement location all matter. Two relevant instruments listed on the Artin Azma website are the portable Hach DR1900 and the laboratory Hach DR6000. This guide explains their roles and the measurement practices that support usable results.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000003 elementor-widget elementor-widget-heading\" data-id=\"d000003\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">How does a spectrophotometer work?<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000004 elementor-widget elementor-widget-image\" data-id=\"d000004\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"950\" src=\"https:\/\/artinazma.net\/wp-content\/themes\/woodmart\/images\/lazy.png\" class=\"attachment-full size-full wp-image-20826 wd-lazy-load wd-lazy-fade\" alt=\"\" data-wood-src=\"https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/spectrophotometer-optical-path-en.svg\" srcset=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1. Conceptual optical and signal path. Original educational schematic, not a model-specific optical drawing.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000005 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000005\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>The main functional parts are a light source, a wavelength selection system, a sample compartment, a detector and electronics that process and display the result. Their exact optical arrangement varies between instruments. A general explanation of these components should not be mistaken for a service drawing of a particular model.<\/p>\n<p>The source produces light. The wavelength selection system directs a selected portion of that light towards the sample. After passing through the sample cell, the light reaches the detector. The instrument compares the measurement with its reference condition and calculates transmittance or absorbance. A concentration calculation then requires the calibration relationship associated with the selected method.<\/p>\n<p>Transmittance is defined as T = I \/ I\u2080, where I is transmitted intensity and I\u2080 is reference intensity. Absorbance is A = \u2212log\u2081\u2080(T). When transmittance is expressed as a percentage, the equivalent expression is A = \u2212log\u2081\u2080(%T \/ 100). Absorbance is dimensionless, although instrument displays commonly identify it with Abs.<\/p>\n<p>Under conditions where the Beer\u2013Lambert relationship is valid, absorbance is proportional to concentration and optical path length. Real samples may depart from those conditions. Chemical interferences, background colour, scattering and unsuitable calibration ranges can prevent a simple conversion. A stable absorbance reading is therefore only one part of a valid analytical result.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000006 elementor-widget elementor-widget-heading\" data-id=\"d000006\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Hach DR1900 and DR6000: the main differences<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000007 elementor-widget elementor-widget-html\" data-id=\"d000007\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"aa-table-wrap\" role=\"region\" aria-label=\"DR1900 and DR6000 comparison\" tabindex=\"0\"><table><thead><tr><th>Feature<\/th><th>Hach DR1900<\/th><th>Hach DR6000<\/th><\/tr><\/thead><tbody>\n<tr><td>Instrument type<\/td><td>Portable VIS spectrophotometer<\/td><td>Laboratory UV\u2013VIS spectrophotometer<\/td><\/tr>\n<tr><td>Wavelength range<\/td><td>340\u2013800 nm<\/td><td>190\u20131100 nm<\/td><\/tr>\n<tr><td>Light source<\/td><td>Xenon flash lamp<\/td><td>Deuterium for UV and tungsten-halogen for the visible region<\/td><\/tr>\n<tr><td>Selection context<\/td><td>Measurements at the sampling location using compatible methods<\/td><td>Laboratory methods requiring a broader wavelength range<\/td><\/tr>\n<\/tbody><\/table><\/div><p style=\"text-align:center;font-size:14px;margin-top:10px\" dir=\"ltr\">Table 1. Main specifications of the two Hach spectrophotometers; confirm configuration details against the applicable model documentation.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000008 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000008\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>The specifications above are based on the <a href=\"https:\/\/cdn.hach.com\/7FYZVWYB\/at\/jxx9c9mznc7c3mwbbkpfs54\/LIT2829.pdf\">official DR1900 technical brochure<\/a> and the <a href=\"https:\/\/cdn.hach.com\/7FYZVWYB\/at\/hscg3tn325cqcmt9mhfsxc93\/DOC0225290367_8ed.pdf\">official DR6000 user manual<\/a>. Check the documentation supplied with the particular instrument and configuration when preparing an operating procedure.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000009 elementor-widget elementor-widget-heading\" data-id=\"d000009\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">When is the DR1900 worth considering?<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00000a elementor-widget elementor-widget-image\" data-id=\"d00000a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"578\" height=\"533\" src=\"https:\/\/artinazma.net\/wp-content\/themes\/woodmart\/images\/lazy.png\" class=\"attachment-full size-full wp-image-20815 wd-lazy-load wd-lazy-fade\" alt=\"\" srcset=\"\" sizes=\"(max-width: 578px) 100vw, 578px\" data-wood-src=\"https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/DR1900-01H_Spectro-Portable-DR1900-RZ-1.webp\" data-srcset=\"https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/DR1900-01H_Spectro-Portable-DR1900-RZ-1.webp 578w, https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/DR1900-01H_Spectro-Portable-DR1900-RZ-1-300x277.webp 300w, https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/DR1900-01H_Spectro-Portable-DR1900-RZ-1-150x138.webp 150w\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Hach DR1900 portable spectrophotometer, from the Artin Azma product library<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00000b color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d00000b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>The <a href=\"https:\/\/artinazma.net\/en\/product\/dr1900-portable-spectrophotometer\/\">Hach DR1900 portable spectrophotometer<\/a> is an option when measurements need to be performed near the sampling location. Portability can influence instrument selection where transporting samples is difficult, provided that the analytical procedure can be performed correctly at that location. The working environment, sample preparation requirements and control materials still need consideration.<\/p>\n<p>Its 340\u2013800 nm range sets a clear limitation: a method requiring a wavelength outside this interval is unsuitable for this model. Even within the interval, compatibility must be established for the actual reagent, concentration range, cell and procedure. A vial fitting into the sample compartment does not establish complete analytical compatibility.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00000c elementor-widget elementor-widget-heading\" data-id=\"d00000c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">What does the DR6000 offer?<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00000d elementor-widget elementor-widget-image\" data-id=\"d00000d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"450\" height=\"297\" src=\"https:\/\/artinazma.net\/wp-content\/themes\/woodmart\/images\/lazy.png\" class=\"attachment-full size-full wp-image-20818 wd-lazy-load wd-lazy-fade\" alt=\"\" srcset=\"\" sizes=\"(max-width: 450px) 100vw, 450px\" data-wood-src=\"https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/LPV4419900012_Spectro-DR6000-LZ-e1764762894581-1.webp\" data-srcset=\"https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/LPV4419900012_Spectro-DR6000-LZ-e1764762894581-1.webp 450w, https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/LPV4419900012_Spectro-DR6000-LZ-e1764762894581-1-300x198.webp 300w, https:\/\/artinazma.net\/wp-content\/uploads\/2026\/10\/LPV4419900012_Spectro-DR6000-LZ-e1764762894581-1-150x99.webp 150w\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Hach DR6000 laboratory spectrophotometer, from the Artin Azma product library<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00000e color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d00000e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>The <a href=\"https:\/\/artinazma.net\/en\/product\/dr6000-uv-vis-spectrophotometer\/\">Hach DR6000 UV\u2013VIS spectrophotometer<\/a> covers 190\u20131100 nm and supports wavelength scanning. It can therefore be considered for laboratory work requiring ultraviolet measurements or absorbance measurements across a wavelength interval. These capabilities are described in the <a href=\"https:\/\/cdn.hach.com\/7FYZVWYB\/at\/hscg3tn325cqcmt9mhfsxc93\/DOC0225290367_8ed.pdf\">manufacturer&#8217;s user manual<\/a>.<\/p>\n<p>A broader wavelength range does not automatically make every result more accurate. For a particular test, sample preparation and method execution may have a larger practical effect than the availability of additional wavelengths. Compare instruments against a defined list of methods rather than assuming that one model is universally preferable.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00000f elementor-widget elementor-widget-heading\" data-id=\"d00000f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Choosing the sample cell and the blank<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000010 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000010\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>The sample cell must be compatible with the instrument, selected method and measurement wavelength. Its material, dimensions and optical path length all matter. For ultraviolet work, use a cell with suitable transmission at the required wavelength. A glass or plastic cell intended for another application should not be assumed suitable for UV measurements.<\/p>\n<p>Inspect optical surfaces for contamination, fingerprints, droplets and significant scratches. Bubbles in the light path can change the reading. Handle cells consistently and follow the method&#8217;s instructions for positioning and filling. Differences between cells should be considered when unexpected offsets occur, rather than immediately changing instrument calibration.<\/p>\n<p>The blank establishes the measurement reference, but its composition depends on the method. It may be water, solvent, untreated sample or a preparation containing reagents. Using distilled water for every test is incorrect. Distinguish the solution used to zero the instrument from other analytical blanks included to monitor contamination or reagent contribution.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000011 elementor-widget elementor-widget-heading\" data-id=\"d000011\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">A general measurement workflow<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000012 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000012\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>The following sequence is a framework, not a substitute for an analytical procedure. Sample volumes, reagent quantities, reaction times, temperatures and instrument settings must come from the specific method. Keep the applicable procedure available at the workstation so that operators are working from the same instructions.<\/p>\n<ol>\n<li><strong>Select the method and range.<\/strong> Confirm the parameter, method number, reporting unit, concentration range and compatibility with the instrument and reagents.<\/li>\n<li><strong>Prepare the instrument and cell.<\/strong> Complete the model-specific startup checks and select the required cell and holder.<\/li>\n<li><strong>Prepare sample and blank.<\/strong> Follow the prescribed addition sequence, mixing, reaction conditions and any digestion step.<\/li>\n<li><strong>Read the blank.<\/strong> Establish the reference as directed and determine when a new blank measurement is required.<\/li>\n<li><strong>Measure the sample.<\/strong> Clean the cell exterior, position it correctly and read it within the permitted time window.<\/li>\n<li><strong>Review and record the result.<\/strong> Retain sample identification, method, unit, dilution information and quality control results.<\/li>\n<\/ol>\n<p>Do not report an out-of-range result by extrapolating a calibration curve without method support. Use an appropriate alternative range or an authorised dilution procedure. An instrument displaying a number does not establish that the number lies within the validated working range.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000013 elementor-widget elementor-widget-heading\" data-id=\"d000013\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Absorbance, transmittance and concentration are different results<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000014 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000014\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>An absorbance display does not by itself establish analyte concentration. Concentration requires a calibration relationship and a reporting basis. For example, a result expressed as mg\/L Fe is not interchangeable with the mass concentration of an iron-containing compound. For nitrogen compounds, reporting as nitrogen is also different from reporting as the complete ion. Check the measurand and unit before comparing reports.<\/p>\n<p>Hypothetical example: an absorbance of 0.30 does not mean a concentration of 0.30 mg\/L. The conversion depends on the calibration slope, intercept, reaction conditions and any dilution factor. Display resolution also differs from the number of significant digits justified in a report. Additional decimal places do not improve the underlying method performance.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000015 elementor-widget elementor-widget-heading\" data-id=\"d000015\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">What does a stored instrument program establish?<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000016 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000016\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>A stored program typically supplies settings and a calculation associated with a defined analytical method. It does not remove the need to read that method. A single parameter can have several reagent systems, ranges and preparation procedures. Selecting a familiar parameter name while overlooking the method number can produce a plausible but inappropriate result.<\/p>\n<p>Before ordering consumables, prepare a list containing method numbers, reagent catalogue references and required cells. Identify any separate digestion reactor, pipettes, preparation vessels or adapters. An instrument used for the optical reading does not necessarily include all the equipment needed to perform the test. Include quality control materials in this list rather than treating them as an afterthought.<\/p>\n<p>For a user-defined method, establish the working range, calibration, quality control and matrix limitations before routine use. Changing a wavelength or importing a factor does not by itself create a validated method. Document who approved the procedure and how later changes will be assessed.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000017 elementor-widget elementor-widget-heading\" data-id=\"d000017\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Sample preparation and measurement timing<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000018 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000018\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Sampling is part of the measurement process. An unsuitable container, delayed testing or incorrect preservation may alter the sample before it reaches the instrument. Correct instrument operation cannot reconstruct the original sample. Obtain container requirements, storage conditions and permitted holding times from the method for the individual parameter; there is no single preservation instruction suitable for all tests.<\/p>\n<p>Retain the sampling location, collection time and any preparation details with the sample record. Where sampling and analysis are performed by different people, make the handover information explicit. A result with an unclear sample identity remains difficult to interpret even if the optical measurement was performed correctly.<\/p>\n<p>For colour-forming reactions, track reagent addition and reading times. When a method specifies a colour development or stability interval, an earlier or later reading is not automatically equivalent. Use appropriate volumetric equipment for small additions. Incomplete mixing may cause uneven response, while excessive shaking may introduce bubbles. Apply the mixing instructions of the actual test.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000019 elementor-widget elementor-widget-heading\" data-id=\"d000019\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Dilution and the final reported concentration<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00001a color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d00001a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Use an authorised diluent and suitable volumetric equipment. Dilution may reduce an interference, but it does not guarantee its elimination. It can also move an analyte towards the lower end of the method&#8217;s working range. Confirm that the diluted solution gives a result within the applicable interval and respect any method-specific restrictions on dilution.<\/p>\n<p>Hypothetical example: bringing 10 mL of sample to a final volume of 50 mL gives a dilution factor of 5. If the diluted solution reads 2 mg\/L and the instrument has not already applied that factor, the original sample concentration is 10 mg\/L. Applying the factor both in the instrument and again manually creates an incorrect result.<\/p>\n<p>Make the point of application explicit in the laboratory procedure. Record both the dilution preparation and the calculation so another analyst can reconstruct the result. Distinguish the measured concentration of the diluted solution from the concentration reported for the original sample.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00001b elementor-widget elementor-widget-heading\" data-id=\"d00001b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Instrument verification and method calibration<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00001c color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d00001c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Zeroing, checking instrument performance and calibrating an analytical method serve different purposes. Zeroing establishes a reference. Instrument verification examines characteristics such as wavelength accuracy or photometric response. Method calibration defines the relationship between response and analyte concentration under the specified analytical conditions.<\/p>\n<p>Use suitable reference materials or filters with relevant certificates and acceptance limits. A calibration procedure written for a UNICO instrument should not be transferred to a DR1900 or DR6000 without confirmation. Internal adjustment is not a substitute for investigating a failed performance check. Establish the cause and the authorised corrective action before changing settings.<\/p>\n<p>The appropriate checks depend on the intended use and the laboratory quality programme. Record reference identification, conditions, acceptance criteria and results. A pass should be traceable to a defined requirement rather than a general statement that the instrument \u201clooks correct.\u201d<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00001d elementor-widget elementor-widget-heading\" data-id=\"d00001d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Planning useful analytical quality controls<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00001e color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d00001e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Define acceptance criteria before analysing a batch. A control standard with an assigned value can help assess performance, but acceptance depends on the method and laboratory quality programme. One fixed percentage is not automatically appropriate for every analyte and concentration. Check standard suitability, validity and storage conditions before interpreting a failure.<\/p>\n<p>Duplicate samples provide information about result dispersion. A matrix spike can help investigate recovery where the method supports it. Passing a standard prepared in clean water does not establish the absence of interference in an actual wastewater sample. These checks answer different questions and should be selected for the problem being investigated.<\/p>\n<p>Retain failed controls and the corrective action record. Repeatedly reading a control until an acceptable number appears is not an investigation. Hach&#8217;s <a href=\"https:\/\/waterinsights.hach.com\/check-colorimetric-accuracy-troubleshoot-results\/\">guidance on checking colorimetric accuracy<\/a> discusses the distinct contributions of instrument performance, reagents and sample conditions. Apply corrections only as supported by the analytical procedure.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00001f elementor-widget elementor-widget-heading\" data-id=\"d00001f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Troubleshooting an unexpected result<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000020 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000020\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Start with observable issues: sample identity, selected program, unit, cell type, cleanliness and dilution factor. Next review reagent validity and storage, preparation and reaction timing. Investigate an unusual blank before continuing the batch. Subtracting an arbitrary offset or changing program coefficients to match an expected answer is not a valid correction.<\/p>\n<p>If several samples and controls shift together, investigate a possible shared cause. If only one sample behaves unusually, its preparation or matrix deserves attention. This is an investigation strategy, not a diagnosis. Preserve raw results and record when the problem first appeared.<\/p>\n<p>Avoid making several unrelated changes simultaneously. Replacing reagents, cleaning cells and changing settings together may conceal which action resolved the issue. Assess each justified action and its effect. Determine whether earlier results could have been affected and document any required reassessment.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000021 elementor-widget elementor-widget-heading\" data-id=\"d000021\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Maintenance and instrument records<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000022 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000022\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Clean the housing, sample compartment and cells using materials and procedures authorised by the manufacturer. A reagent spill should be addressed under the appropriate cleaning instructions rather than ignored while measurements continue. Opening internal components or handling optics is not routine external cleaning.<\/p>\n<p>Base servicing and parts replacement on the specific instrument documentation, observed condition and technical service advice. Retain service dates, error messages, performance checks and changes that could affect measurements. After relevant repair or relocation, confirm fitness for the intended work under the laboratory programme.<\/p>\n<p>Startup times, stray-light tests and wavelength correction procedures are model-specific. Do not copy instructions from another instrument simply because both devices measure absorbance. Maintain the operating procedure alongside the correct revision of the manufacturer&#8217;s documentation.<\/p>\n\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000023 elementor-widget elementor-widget-heading\" data-id=\"d000023\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Frequently asked questions<\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000024 elementor-widget elementor-widget-heading\" data-id=\"d000024\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Can the DR1900 fully replace the DR6000?<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000025 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000025\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>No. Their wavelength coverage and intended operating contexts differ. A method outside the DR1900 wavelength range is unsuitable for that model. Within the shared range, establish reagent, cell and program compatibility for the particular test before deciding whether substitution is acceptable.<\/p>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000026 elementor-widget elementor-widget-heading\" data-id=\"d000026\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Does good repeatability prove that a result is correct?<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000027 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000027\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>No. Closely grouped readings can share a systematic error, such as an unsuitable blank or incorrect program. Assess trueness using an appropriate control or reference. Repeated readings alone provide incomplete evidence about analytical quality.<\/p>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000028 elementor-widget elementor-widget-heading\" data-id=\"d000028\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">Can the method be chosen from the sample's visible colour?<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d000029 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d000029\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Visible colour alone is insufficient. Define the target analyte, expected range, reaction and potential interferences. A coloured sample may require an authorised background correction. Guessing a wavelength or blank does not establish a reliable method.<\/p>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00002a elementor-widget elementor-widget-heading\" data-id=\"d00002a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><span dir=\"ltr\">What information is needed to select an instrument?<\/span><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00002b color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d00002b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div dir=\"ltr\" style=\"text-align:left\">\n<p>Prepare the parameter list, method numbers, required ranges, sample types and measurement location. Then check instrument compatibility, consumables and preparation equipment. The DR1900 and DR6000 product pages on Artin Azma provide starting points for reviewing the models; the final choice should follow the actual analytical requirements.<\/p>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d00002c elementor-widget elementor-widget-image\" data-id=\"d00002c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.instagram.com\/artin.azma\/?hl=en\" target=\"_blank\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"227\" height=\"222\" src=\"https:\/\/artinazma.net\/wp-content\/themes\/woodmart\/images\/lazy.png\" class=\"attachment-full size-full wp-image-17699 wd-lazy-load wd-lazy-fade\" alt=\"\u0627\u06cc\u0646\u0633\u062a\u0627\u06af\u0631\u0627\u0645\" srcset=\"\" sizes=\"(max-width: 227px) 100vw, 227px\" data-wood-src=\"https:\/\/artinazma.net\/wp-content\/uploads\/2025\/08\/download-2.jpg\" data-srcset=\"https:\/\/artinazma.net\/wp-content\/uploads\/2025\/08\/download-2.jpg 227w, https:\/\/artinazma.net\/wp-content\/uploads\/2025\/08\/download-2-150x147.jpg 150w\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Follow Artin Azma on Instagram<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Learn how spectrophotometers work, compare Hach DR1900 and DR6000, and review cells, blanks, dilution, calibration and analytical quality control.<\/p>\n","protected":false},"author":2,"featured_media":20814,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[490],"tags":[],"class_list":["post-20821","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Spectrophotometer Guide: DR1900 vs DR6000 | Artin Azma<\/title>\n<meta name=\"description\" content=\"Learn how spectrophotometers work, compare Hach DR1900 and DR6000, and review cells, blanks, dilution, calibration and analytical quality control.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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