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MD 100 Chlorine, liquid reagents

Precise water control with proven and compact measuring system Mark as favourite

Part Number 276005


  • High-precision optics
  • High accuracy and reproducibility through precision interference filter (5 nm)
  • Industry specific parameter combinations available

The MD 100 colorimeter is a single parameter colorimeter for water quality analysis. This line of rugged, waterproof instruments is lightweight and ideal for field testing or for use in the laboratory.
Chlorine is one of the most popular water quality testing parameters and the MD 100 Chlorine Colorimeter offers a testing solution to fit a wide variety of industries and applications.
This instrument is pre-programmed with three testing ranges for testing Free, Total and Combined Chlorine. All testing ranges use the DPD method and utilize tablet or liquid reagents, depending on the range selected.


  • Boiler Water
  • Cooling Water
  • Disinfection Control
  • Drinking Water Treatment
  • Pool Water Control
  • Pool Water Treatment
  • Raw Water Treatment
  • Waste Water Treatment

The MD 100 has several key features that make it a favorite among users.

  • Waterproof Design
    The IP 68 design of this instrument ensures that the MD 100 remains water tight for up to 1 hour at 0.1 meter.
    Don't worry about dropping the instrument into a body of water - it floats!
  • Accurate, Reproducible Results
    The optical system of the MD 100 utilizes LEDs and interference filters
    which quickly gives you results that you can be confident in. You always measure in the spectral peak.
  • User Calibration Mode
    A one-point calibration is possible. 
    Additionally, all MD 100 instruments have the ability to display readings directly in ABS or %T units.
  • One-time-Zero Function
    Don't waste time waiting for your instrument to Zero after each test.
    When testing a new sample, zero the instrument once and all subsequent tests of that sample do not require you to re-zero the instrument.
  • Automatic Data Storage with Transfer Capabilities
    The MD 100 automatically stores the last 16 readings with time and date stamp.
    These results can be transferred to a spreadsheet using the IRiM accessory.
  • Ergonomic Design
    Whether you're using the MD 100 out in the field or in the lab, the design of the instrument  makes it easy to handle and view the display.
    If you're using the instrument in the lab, the rubber feet on the bottom of the housing eliminates the need for two hand operation or to chase your instrument around the workbench.
  • Factory Programmed
    All MD 100 instruments are supplied ready to use with up to 14 calibration curves.
    All you need to do is select the test you need, prepare your sample and test!
  • Scroll Driven Menu System
    The simple interface allows you to quickly reach the test you need.
    When the instrument is turned on, it will automatically display the last test used.
  • 2-Year Warranty
Optics LEDs, interference filters (IF) and photo sensor in transparent sample chamber. Depending on the version, up to 3 different interference filters are used. Wavelength specifications of interference filters:
430 nm Δλ = 5 nm
530 nm Δλ = 5 nm
560 nm Δλ = 5 nm
580 nm Δλ = 5 nm
610 nm Δλ = 6 nm
660 nm Δλ = 5 nm
Wavelength Accuracy ± 1
Photometric Range -2500 - 2500 mAbs
Photometric Accuracy 3 % FS (T = 20 °C – 25 °C)
Operation Foil keypad
Display backlit LCD (on keypress)
Suitable Vials Round Cuvettes 24 mm
Calibration factory calibration and user calibration. Reset to factory calibration possible
Interfaces Infrared
Internal Storage internal ring memory for 16 data sets
Power Supply 4 micro batteries (AAA)
Battery Life Time approx. 17 hours
Auto – OFF Yes
Clock Real Time Clock and Date
Portability Portable
Environmental Conditions Temperature:  5 - 40 °C rel. humidity: 30 - 90 % (non condensing)
Compliance CE
Protection Class IP 68
Dimensions 155 x 75 x 35 mm
Weight 260 g
Testparameter Measuring Range Method No. Chemical Method
Chlorine L 0.02 - 4.0 mg/l Cl2 M101 DPD
Title Measuring Range Chemical Method Packaging Unit Part Number Mark as favourite
DPD 1 Buffer Solution, Blue Bottle 0.02 - 4.0 mg/l Cl2 a) DPD 15 ml 471010
DPD 1 Buffer Solution 0.02 - 4.0 mg/l Cl2 a) DPD 100 ml 471011
DPD 1 Buffer Solution 0.02 - 4.0 mg/l Cl2 a) DPD 1 pc. 471016
DPD 1 Reagent Solution, Green Bottle 0.02 - 4.0 mg/l Cl2 a) DPD 15 ml 471020
DPD 1 Reagent Solution 0.02 - 4.0 mg/l Cl2 a) DPD 100 ml 471021
DPD 1 Reagent Solution 0.02 - 4.0 mg/l Cl2 a) DPD 1 pc. 471026
DPD 3 Solution, Red Bottle 0.02 - 4.0 mg/l Cl2 a) DPD 15 ml 471030
DPD 3 Solution 0.02 - 4.0 mg/l Cl2 a) DPD 100 ml 471031
DPD 3 Solution 0.02 - 4.0 mg/l Cl2 a) DPD 1 pc. 471036
DPD Reagent Set 0.02 - 4.0 mg/l Cl2 a) DPD 1 pc. 471056
Title Online Download Type Format Language Direct Download
Datasheet 276005 - MD 100 Chlorine, liquid reagents Datasheet PDF (0.20 MB)
Instruction Manual MD 100, MD 110, MD 200 Instruction Manual PDF (11.25 MB)
Instruction Manual Single Method M101 - Chlorine L Instruction Manual PDF (0.73 MB)
00386442 - MD1x0/200 - Chlorine L, Chlorine T Instruction Manual PDF (6.48 MB)
Data Acquisition Software Utility Program ZIP (124.72 MB)
Declaration of Conformity md_100 Declaration of Conformity PDF (0.19 MB)
  • Instrument in plastic case
  • DPD 1 Buffer Solution
  • DPD 1 Reagent Solution
  • DPD 3 Solution
  • 4 micro batteries (AAA)
  • 3 round cuvettes (glass) with lid
  • Sealing rings
  • Stirring rod
  • Brush
  • Instruction manual
  • Quick Start Guide
  • Certificate (COC)
  • Warranty information
Title SDS Country Direct Download
DPD 1 Buffer solution
DPD 1 Reagent Solution
DPD 3 Reagent Solution