Description
Description
The Model Q46H/62-63 Residual Chlorine Dioxide Monitor system uses a polargraphic membraned sensor to measure chlorine directly, without the need for chemical reagents. When needed, automatic pH compensation may be added for highest free chlorine measurement accuracy and systems are available to provide 4-20mA outputs for chlorine, pH, and temperature to allow easy CT calculations.
Q46H systems are economical to purchase, economical to maintain, and provide long term accuracy and reliability for your chlorine monitoring needs. Monitor capabilities have been expanded to include options for a 3rd analog output or for adding additional low power relay outputs. Digital communication options for Profibus, Modbus or Ethernet have also been added.
Two types of chlorine sensors are available, one designed for flowcell installation and one for submersion applications. Free chlorine monitoring should always be done using a flowcell system. Good control of sample flow and pressure is important for accurate measurement, and the standard constant-head flowcell should be used for most applications. A sealed flowcell and a low-volume flowcell are also available for special applications.
Submersible combined chlorine sensors can sometimes be used for measuring total chlorine in wastewater effluent. Wastewater effluents containing more than 1 ppm of ammonia often result in a chlorine residual that is more than 90% microchloramine. Direct measurement with a submersible sensor can provide a dependable monitor without all the sampling and chemicals associated with total chlorine measurement.
Chlorine sensors, especially free chlorine, require up to 8 hours of stabilization time when first installed or after membrane change. The Q46H offers a battery powered “polarizer” that can be used to stabilize a spare sensor so it is ready to run within a few minutes of installation. Polarizers simply plug into the sensor connector and require no adjustments.
Standard Q46H systems are AC powered 9100-240 VAC, 50/60 Hz) but a 12-30 VDC version is also available. The basic system includes 2 isolated 4-20 mA outputs and 3 SPDT alarm relays. If pH correction is required, or if pH measurement is also desired, an optional pH sensor is available. With this sensor connected, the second analog output may be configured for pH instead of temperature to provide a dual chlorine/pH monitor system. Q46H systems may also be supplied with an additional output board. this output board may contain either a third 4-20 mA output or three additional low power relays. Adding the third analog output is the most common as the system then provides isolated outputs for chlorine, pH and temperature. In addition to the analog output options, Q46H monitors may be supplied with digital communications. A Profibus-DP interface is currently available, with Modbus and Ethernet options under development.
