Principle of Operation:
The DR900 multi-parameter portable colorimeter for free chlorine and other parameters uses the spectrophotometric method, utilizing the selective absorption of light at a specific wavelength by a substance to identify the substance or determine its concentration.
Industry Applications:
The DR900 multi-parameter portable colorimeter for free chlorine and other parameters is suitable for municipal wastewater, environmental monitoring, water treatment, industrial process monitoring, tap water, drinking water, boiler water, cooling water, education, agriculture, and other fields.
Instrument Features:
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The DR900 multi-parameter portable colorimeter for free chlorine and other parameters offers three reading modes: concentration, % transmittance, and absorbance.
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90 measurement programs are pre-installed to meet multi-parameter measurement needs such as free chlorine, COD, TOC, ammonia nitrogen, etc. Users can create up to 10 custom measurement programs.
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A favorites menu for commonly used measurement programs can be set up for quick selection of your favorite measurement programs.
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It features blank adjustment and standard adjustment functions to correct for differences between different batches of reagents.
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Data storage capacity of up to 500 records, GLP compliant, with data transfer via USB interface.
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The screen features a backlight display function, making it easy for users to operate the instrument in dark places or under direct sunlight.
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Optional Chinese operation interface; indicator icons guide users through program or menu setup.
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Ergonomic design for easy operation; IP67 protection class, excellent drop resistance and shock resistance.
Technical Specifications
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Light source LED
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Detector Silicon photodiode
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Wavelength 420,520,560,610nm
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Wavelength accuracy ±1nm
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Photometric measuring range 0 - 2 Abs
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Reading modes Concentration, absorbance, % transmittance
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Pre-installed measurement programs 90
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User-defined curve function Yes, up to 10
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Wavelength selection Automatic selection
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Data storage 500 records (GLP compliant, with result, time, date, sample ID, user ID)
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Interface languages 22, including Chinese
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Operating environment 10 ~ 40℃, max. 80% relative humidity (non-condensing)
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Storage environment -30 ~ 60℃, max. 80% relative humidity (non-condensing)
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Protection class IP67
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Data interface Mini USB
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Display LCD backlit display
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Sample vial types 25mm round, 16mm round (adapter required)
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Battery type AA battery, 4 pcs
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Battery life Typically 6 months
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Dimensions 231 x 96 x 48 mm
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Weight 0.6kg
Ordering Guide
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Order No. Description
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2722000 Soft-sided carrying case
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4942500 Hard-sided carrying case
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4943000 CEL carrying case
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2763900 Absorbance standards for DR/verification (set of 4)
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2635300 SpecCheck secondary standards, gel, DPD chlorine, low range
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2980500 SpecCheck secondary standards, gel, DPD chlorine, medium range
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2893300 SpecCheck secondary standards, gel, DPD chlorine, high range
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2712500 SpecCheck secondary standards, gel, fluoride, 0-2.00 mg/L
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2708000 SpecCheck secondary standards, gel, ozone, medium range, 0-0.75 mg/L
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2507500 SpecCheck secondary standards, gel, monochloramine and free ammonia
Source: Public information from the HACH Water Quality website
Case Studies
Municipal Wastewater Treatment · Hach-lab — Application Case
Project Overview
The site is the inlet, biological and outlet stages of a municipal plant. The customer wanted Hach-lab properly configured on the existing plant, with the aim of laboratory colorimetric and titrimetric water analysis.
Technical Challenges
What actually causes trouble is high solids and corrosive fractions, with large diurnal flow swings, and effluent parameters drift and probes foul with sludge and biofilm. All of this means the Hach-lab configuration has to involve selected by method standard, sample throughput and reagent kit.
Configuration
Supply and installation were organised through the laboratory line: configuring around lab method standards and sample throughput. On site this meant selected by method standard, sample throughput and reagent kit, checked line by line against: stable compliance with Grade 1A discharge limits and online data reporting.
Performance
After commissioning the outcome is standardised methods that make data comparable between labs, and the readings are now used for process tuning.
Food & Beverage · Hach-lab — Application Case
Site Conditions
This is a Food & Beverage customer whose plant is at dosing, pasteurising, filling and CIP stages. The main task was laboratory colorimetric and titrimetric water analysis.
The Problem
The difficulty lies in syrups, dairy and beverages that scale easily, under strict hygienic requirements; at the same time frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles. Specification therefore means selected by method standard, sample throughput and reagent kit.
What We Did
We took a laboratory line approach — configuring around lab method standards and sample throughput. Delivery was built around selected by method standard, sample throughput and reagent kit, with point-by-point checks on: food-safety and hygienic design per 3-A / EHEDG.
Operating Outcome
In service the system performs as intended — standardised methods that make data comparable between labs, with routine maintenance falling noticeably.
Chemical & Pharmaceutical · Hach-lab — Application Case
Application Context
reactors, metering vessels and finished-product tanks is a typical Chemical & Pharmaceutical duty. The project started from Hach-lab, focusing on laboratory colorimetric and titrimetric water analysis.
Process Constraints
corrosion plus Ex protection shortens instrument life and makes downtime costly, and highly corrosive media with solvents and crystallisation, partly in explosive atmospheres only amplify it. The Hach-lab specification must therefore cover selected by method standard, sample throughput and reagent kit.
Delivery Approach
Delivery was handled as the laboratory line — configuring around lab method standards and sample throughput. Execution centred on selected by method standard, sample throughput and reagent kit, together with Ex certification and GMP traceability of records.
Field Results
Operation shows the benefit clearly — standardised methods that make data comparable between labs, with confidence in this measuring point improving markedly.
Power & Energy · Hach-lab — Application Case
Customer Profile
The typical setting in Power & Energy is boiler feedwater, turbine condensate and FGD/DeNOx systems. The measuring point is Hach-lab; the focus is laboratory colorimetric and titrimetric water analysis.
Key Difficulties
Conditions are high temperature and pressure with both steam and saline water and, on top of that, drift under high temperature and pressure, with very costly unplanned outages, which a standard configuration cannot handle for long. The design therefore starts with selected by method standard, sample throughput and reagent kit.
Implementation
The scope ran through the laboratory line: configuring around lab method standards and sample throughput. Technically it hinges on selected by method standard, sample throughput and reagent kit, and on these requirements: compliance with power-industry codes and unit availability targets.
Customer Benefit
In practice this means standardised methods that make data comparable between labs, which cut the workload on the site maintenance team.
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