RAH-210 Residual Chlorine Monitor & Analyzer

Note: Food-grade vinegar can be used as the pH buffer reagent if the water pH varies. If pH is relatively constant and you are measuring free chlorine, no buffer solution is required.

Maintenance:
A continuously driven cleaning system is employed to prevent a concentration of impurities on the surface of the electrodes which reduces the need for maintenance.

Basic Specifications:

ELECTRICAL
• Power Consumption: 10 W max
• Power Requirements: 120VAC, 50/60 Hz or 240VAC, 50/60 Hz, single phase
• Output Signal: 4-20 mA
• Relay Contact: 10 Amps @ 120 VAC or 24 VDC, resistive load, 5 Amps @ 240 VAC, resistive
   load

MEASUREMENT
• Temperature Range: 0 to 50 C (32 to 120 F)
• Sample Water Flow Rate: 500 ml/minute (0.13 GPM or 8 gal/hr)
• Sample Pressure: 5 psig (0.3 bar) maximum at inlet point.
• Sample Supply: Continuous ~ Electrodes must be kept wet with fresh water.
• Speed of Response: 4 seconds ~ Full-scale residual change 90 to 120 seconds.
• Sample Water: Metal ions or corrosion inhibitors effect operation.
• Range: 0 to 0.1 to 0 to 20 mg/l (PPM) ~ Field adjustable.
• Accuracy: 0.003 mg/l or +/-1% of range, whichever is larger.
• Sensitivity: 0.001 mg/l (1 ppb)

RPH-250 - Probe-Style Residual Chlorine Analyzer

Because Chlorine residual measurement probes are sensitive to pressure and flow fluctuations, the RPH-250 is provided with everything needed to supply a steady sample water pressure at a consistent flow rate. A plastic pressure regulating valve with an attached pressure gauge is included with each unit. An integrally designed flow control valve and graduated metering tube make setting and maintaining the sample flow a snap.

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ELECTRICAL
• Power Consumption: 16 VA
• Power Requirements: 120VAC, 50/60 Hz or 240VAC, 50/60 Hz, single phase
• Output Signal: (2) 4-20 mA
• Relay Contact: 10 Amps @ 120 VAC or 24 VDC, resistive load, 5 Amps @ 240 VAC, resistive
   load

MEASUREMENT
• Temperature Range: 5º to 45º C (41º to 113º F)
• Sample Water Flow Rate: 30-100 ml/minute / 8-26 gal/hr (must be kept steady)
• Sample Pressure: 15 psig (0.9 bar) maximum at inlet point
• Sample Supply: Continuous. Membrane must be kept wet with fresh water.
• Speed of Response: 10 seconds. Full-scale residual change 90 to 120 seconds.
• Sample Water: Metal ions or corrosion inhibitors effect operation.
• Range: 0-0.1 to 0-10 ppm. Field adjustable.
• Accuracy: 0.01 ppm or +/-1% of range, whichever is larger.
• Sensitivity: 0.01 ppm (10 ppb)

Different Forms of Chlorine

FREE CHLORINE
Free chlorine is defined as the concentration of residual chlorine in water present as dissolved gas (Cl2), hypochlorous acid (HOCl), and/or hypochlorite ion (OCl-). A test kit which measures free chlorine will indicate the combined concentrations of HOCl, OCl-, and Cl2.

COMBINED CHLORINE
Combined chlorine is defined as the residual chlorine existing in water in chemical combination with ammonia or organic amines which can be found in natural or polluted waters. Ammonia is sometimes deliberately added to chlorinated public water supplies to provide inorganic chloramines. This process is generally referred to as "chloramination."

TOTAL CHLORINE
Total chlorine is the sum of free and combined chlorine. When chlorinating most potable water supplies, total chlorine is essentially equal to free chlorine because the concentration of ammonia or organic nitrogen compounds (needed to form combined chlorine) will be very low.

When chloramines are present in a municipal water supply, total chlorine will be higher than free chlorine.

Chlorine Analyzer Support