Dechlorination of wastewater effluent is common practice in many treatment facilities throughout the US. Strongly reducing sulfur compounds are used to eliminate chlorine residuals that might prove toxic to fish in the receiving stream. Because residual chlorine discharge limits are often very close to zero, monitoring residual values to comply with regulations has become very difficult, and controlling residuals at values between zero and a few hundred parts-per-billion is often not achievable. Residual chlorine is normally removed by injection of either sulfur dioxide gas or a solution of sodium...

Sulfite Monitors consist of three separate components: a chemistry module where the sample is pH adjusted for measurement, an inlet overflow assembly where raw sample is delivered to the system, and an electronic readout containing the sulfite concentration display, analog output, and alarm contacts. Readout modules are available in either wall mount NEMA 4X or general purpose panel mount versions. A 20 foot interconnecting cable is supplied to connect the monitor to the chemistry module, and this separation can be increased to a maximum of 100 feet if required. An optional stainless steel system...

Suffix C - Enclosure 1 - Panel Mount 2 - NEMA 4X Wall Mount Suffix D Suffix D - Power 1 - 120 VAC, 60 Hz 2 - 220 VAC, 50 Hz Options: 00-1261 Stainless steel system mounting plate 31-0037 Sensor interconnect cable (max. 100 ft.) Represented By: Ordering Information: Model A15/66 - C - D Monitor Typical Installation Electronic Monitor Range: 0-2.000 or 0-20.00 PPM Accuracy: ±0.03 PPM Repeatibility: ±0.01 PPM Linearity: 0.1% of FS Zero Drift: <0.01 PPM per month Display: 16 character alphanumeric backlit LCD Control Relays: Two SPDT relays, 5A @ 220 VAC resistive Programmable deadband and time delay...