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Colorimeter : IP67 Waterproof Portable Colorimeter measures Free Chlorine, Total Chlorine, Cyanuric Acid and pH

Our C401 colorimeter measures Free Chlorine, Total Chlorine, Cyanuric Acid and pH. This latest laboratory-grade microprocessor-based colorimeter offers quick, accurate and repeatable results. The meter comes with large custom-made LCD and user-friendly self-diagnostic warning messages.

These Colorimeters are supplied with reagents and sample vials in rugged carrying cases for swift testing on the go. Be it for swimming pools, spas, industrial wastewater, municipal treated water monitoring, paper and pulp mills or water conditioning control, you can select from the C401, C301, C201, C101 or C102 models. Excellent repeatability, auto-ranging and easy to use. The meter ensures excellent repeatability, has auto-ranging capabilities while using only one-vial-one-sachet per test.

Main Features :

  • High Quality Reagents
    The custom-formulated reagents provide excellent accuracy, repeatability and stability. The
    y are conveniently packed for ease of use.
  • USEPA-approved DPD method*
    Chlorine measurements are based on the USEPA-approved DPD method*.
  • Advanced Power Management
    The meter is capable of measuring more than 3,000 tests using a single set of 4 ‘AAA’ alkaline batteries. Auto power-off activates after 10 minutes of non-use to conserve battery life.
  • Fuss-free Meter Operation
    The meter is designed for easy operation. It allows one-time blanking for all parameters and ranges when measuring the same sample. The blanking value is stored in memory even if batteries are replaced. Furthermore, no calibration is needed for Chlorine and Cyanuric Acid. Most importantly, the meter is maintenance-free.
  • Large Easy-to-read Display
    The large screen features 4-digit 14-segment customized liquid crystal display (LCD) with mode indicators to guide meter use.
  • IP67 waterproof and lightweight
    The lightweight meter has a waterproof IP67-rated housing. It even floats when accidentally dropped in water.

*Procedure is equivalent to USEPA method 330.5 for wastewater and Standard Method 4500-Cl G for drinking water.

Parameters measured by C401/301/201/102/101


C401 Free Chlorine, Total Chlorine, Cyanuric Acid & pH
C301 Free Chlorine, Total Chlorine & pH
C201 Free Chlorine & Total Chlorine
C102 Cyanuric Acid
C101 pH

Specifications of the C401 Colorimeter :

Product Code

Measurement Method Photometric
Light Source Light Emitting Diode (LED)
Wavelength 525nm
Detector Silicon photodiode
Absorbance Range 0 - 2.5 Abs
Photometric Precision 0.0015Abs
Automatic Range Selection 0 - 1.99 ppm (Free & Total Chlorine)
2.0 - 6.0 ppm (Free & Total Chlorine)
5 - 90 ppm (Cyanuric Acid)
5.9 - 8.2 pH
Resolution 0.01 ppm (0 - 1.99 ppm; Free & Total Chlorine)
0.1 ppm (2.0 - 6.0 ppm; Free & Total Chlorine)
0.1 pH (5.9 - 8.2 pH)
1 ppm (5 - 90 ppm; Cyanuric Acid)
Accuracy 0.02 ppm (0 – 1.99 ppm; Free & Total Chlorine)
0.2 ppm (2.0 – 6.0 ppm; Free & Total Chlorine)
0.1 pH (5.9 – 8.2 pH)
4 ppm; Cyanuric Acid
Calibration Points User selectable; 1 point per colorimetric test
Display 4-digit 14-segments customized liquid crystal display with annunciators
Sample Cells Borosilicate glass with screw caps, fill line and indexing mark Height x Diameter : 51 x 25 mm
Sample Volume Required 10 ml
Operating Temperature Range 0 – 50C
Operating Humidity Range 0-90% RH non-condensing at 30C
Power Supply 4 ‘AAA’ alkaline batteries
Battery Life > 3000 tests
Electromagnetic EN 61326 Compliance (EMC)
Weight Instrument : 200g
Complete carrying case : 1.25kg
Dimensions Instrument :
6.8(W) x 15.5(L) x 4.6(H) cm
Carrying case : 16(W) x 35(L) x 12(H) cm

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We are proud to announce the pH600 series offering mega-memory capabilities: up to 500 data-sets, and gives you lab accuracy of up to 0.001 resolution. This versatile instrument is the ideal choice in today's demanding Laboratory and field environments with features such as, Wireless and cable-free data transfer with infrared IrDA technology. Comes with PC-based Complimentary Data Acquisition Software for hassle-free data import and report-generation into any popular spreadsheet programs of your choice. Please click here for details.

We accept all major credit/debit cards - please contact us for our best possible prices!; any questions? Why not try our Technical Area where you will find an in-depth explanation of many relevant aspects within the field of electrochemistry! more..


Russell Mainstream Supply Ltd.


Cameron House, 8 Crown Square, Kingskettle, Cupar, Fife, KY15 7PW


Phone: +44 (0)1337 831192

Fax: +44 (0)1337 371192


Email: Sales@rmprocesscontrol.co.uk 



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