Introduction

Application

Design

Operation

Specification

Capital Controls' Series 1870E chlorine residual analyzer technology has been independently tested and proven to be a reliable analyzer for continuous, accurate residual analysis.

The amperometric-based instrument is designed to continuously analyze free or total chlorine, chlorine dioxide, potassium permanganate, iodine, bromine or other oxidants for water, wastewater, cooling water and other process water applications.

Series 1870E features a field selectable monitoring range from 0-0.1 to 0-20 mg/l. the analyzers incorporate a constant, direct-drive electrode cleaning system which eliminates signal drift and the need for frequent recalibration. Internal high and low set points are sstandard.

The analyzer's reagent and sample are gravity fed eliminating the need for metering pumps. Extra large gold and copper electrodes are used for maximum signal strength. Sample temperature variations are compensated within the measuring cell, thereby providing consistent residual values.

1870E chlorine residual analyzer
Continuous on-line operation High-reliability Field-proven Multiple ranges - selectable up to 20 mg/l High and low alarm points Automatic cleaning system Direct measurement of free or total chlorine High/low band control for chemical feed systems Highly accurate low level readings
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Applications Wastewater: Feed - forward dechlorination control; Effluent monitoring Industrial wastewater: Effluent control Power Industry: Effluent monitoring to meet NPDES and M.O.E/ discharge limits Drinking water disinfection: In-plant and finished water monitoring and control Food and beverage: Zero verification after carbon filtration Pharmaceuticals: Zero verification after carbon filtration; simplification of validation procedures Swimming pool disinfection: Accurate control of chlorine residual Cooling water monitoring and control: Control of slime and algae in piping and heat exchangers and throughout the tower
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Design Features Gravity feed reagent: Provides the analyzer with a sample pH of 4.5-4.8 which increases the stability and strength of the generated signal High and low alarm set points: Monitor and control chlorine and other residual oxidants within a concentration band by using high and low alarm set points that are easily adjusted on the front panel. LED lights indicate an alarm has occurred. A latching contact option is available to provide band control for high-low feed control systems Large Cell: The extra large gold and copper electrodes provide maximum signal strength Automatic cleaning : A continuous direct-drive cleaning system maintains a constant level of electrode cleanliness Ease-of-use: All components and controls are accessible from the front of the unit to permit ease of observation of solution level, sample flow, electrodes and adjustment of set points Accurate: The 1% accuracy of the unit is ideal for monitoring and control of water, wastewater and industrial process water Mounting: Easy mounting is accomplished through the mounting panel where all components are attached. Units can also be supplied in a floor or wall cabinet NEMA 4X: The electronics enclosure is NEMA 4X for protection
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Principle of Operation A sample liquid is delivered to the constant head weir at an approximate rate of 500 ml/minute. The excess overflows to drain. The sample then passes through the annular space between the two fixed electrodes in the sensing cell. As it passes, a small DC current is generated in direct linear proportion to the amount of residual present in the sample. The residual value is displayed on the digital indicator in mg/l. The surfaces of both electrodes are kept clean by the continuous action of PVC spheres agitated by a motor-driven rotating striker. This constant cleaning eliminates signal drift and recalibration, and provides an accurate residual measurement. A thermistor compensates for sample temperature variatioon. The liquid reagent is stored in a single bottle an fed from constant head reservoir through a rotary valve. This configuration adds the precise amount of solution during each valve rotation. The reagent bottle supplies 7 days of use before refilling is required. An optional reagent feed system may be adapted for pH buffering using carbon dioxide gas for water treatment applications.
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Specifications Instrument Range: Field selectable 0-0.1, 0-0.2, 0-0.3, 0-0.5, 0-1, 0-2, 0-3, 0-5, 0-10, 0-20 (mg/l) (Others available, consult factory) Resolutions: 0.001 mg/l (1 ppb) Power Requirements: 120 Vac, 60 Hz, or 240 Vac, 50 Hz, single phase Output Signal: Isolated 4-20 or 0-20 mAdc into a maximum of 800 ohms or 0-50 mVdc. Sample Flow: 500 ml/minute Sample Temperature Range: 32°  to 120° F (0° to 50°C) Speed of Response: 4 seconds from sample entry to display indication. 90% of full scale response within 1 1/2 to 2 minutes Ambient Temperature: 32° F to 120° F (0° C to 50° C) Sample Limitations: Samples containing high concentrations of metal ions or certain corrosion inhibitors may effect analyzer operation. At low residual levels (less than 0.1 mg/l) variations in sample dissolved oxygen level may affect the residual reading. Consult factory for specific applications. Accuracy: 0.003 mg/l or +/-1% of range whichever is larger. Reagent Requirement Residual Reagent Chlorine (Free) pH buffer (or CO2 gas) Chlorine (Total) pH buffer (or CO2 gas) and potassium iodide Chlorine Dioxide pH buffer and glycerine Potassium Permanganate pH buffer Iodine pH buffer Bromine pH buffer and potassium iodide Other Oxidants Consult Factory Shipping Weight: 14 lbs. (6.4 kgs)