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The RC-31P Residual Chlorine meter provides a quick and easy measurement of free residual chlorine by the use of a polarographic sensor. The measurement can be achieved without the inconvenience and human errors associated with conventional reagent based portable instruments.
The New RC-31P has an expanded memory allows for the storage of 1000 results, upgraded software control program and the ability to use rechargeable batteries..
It is unique to other conventional models in that it uses no reagents and no membranes but is very accurate when compared against DPD for potable water. It can be calibrated against the colorimetric or titrimetric procedures within seconds.
The operational cost is extremely low and maintainence is simple.
The meter consists of two sections, a handheld keypad and a sensor assembly. The key pad section features a large, easy-to-read LCD panel. The sensor assembly is available in two versions, a grab sampler type and float suitable for field and grab applications, and a flow through cell suitable for tap water outlets and continuous flowing samples.
The meter also indicates the sample temperature and includes a built-in-clock. The instrument can store one set of results (measurement, temperature and time) in memory for later retrieval. Power is provided by two standard AA batteries which have an operating life of up to 50 hours.
|Measuring Method||Free chlorine by polarographic method, Amperometric detection|
|Indication||Digital display, residual chlorine, temp., and time simultaneous|
Chlorine : 0 to
Temperature: 0 to 45 degrees C.
|Repeatability||Residual Chlorine: +/- 0.05mg/L or less at 25C|
|Response time||Less than 90 seconds (at 25C)|
|Water Conditions||pH 5.8 to 8.0, Conductivity 8mS/m(80uS/cm) or more|
|Temp. Compensation||Automatic (0-45C)|
|Data Memory||Up to 1000 data sets|
|Calibration||by coefficient input method or correlation to alternate technique|
|Dual operating mode||Hypochlorous acid or Isocyanuric acid measurement|
|Interval Function||Data recording at selected time intervals (range; 1 second to 99.9 Minutes)|
|RS-232C Interface||Standard for printer or PC|
|Battery Life||Approx. 20 hrs. continuous mode(FCL-221CA), 70 hrs (CLS-221AA)|
|Power Source||2x AA cells or nickel hydride batteries, or AC adapter|
|Dimensions / weight||Main Body:68(W)
x 35(H) x 173(D)mm / Approx. 280g
Sensor: 34 x 111mm / 160g
RC-31-P-F with Electrode FCL-221CA
Standard Sensor and Immersion Type Sensor
RC-31-P-Q with electrode CLS-221AA
Sensor For Testing Flowing Tap Water
What is Residual Chlorine ?
Testing for Residual
Chlorine is very common in water treatment. The word, "residual", means
remainder or that which is left. This test is made to measure the amount
of chlorine remaining in the sample at the time the test is made.
This meter measures "free" chlorine as opposed to "combined" chlorine. Combined chlorines are usually weaker disinfectants and found in systems when ammonia is added to form monochloramine, dichloramine, and trichloramines. This is often done to minimize the amount (DUe to EPA regulations) of trihalomethanes and other organic byproducts that are formed with chlorine in the water.
Total chlorine is
the amount of both free and combined chlorine in the sample.