The Model Q45H/65 Residual Chlorine Dioxide Monitor is designed for on line monitoring and control of industrial disinfection systems. Chlorine dioxide is a powerful disinfecting agent used for treating potable water, cooling water and food processing wash water. To ensure proper disinfection while minimizing disinfection by products, the concentration of disinfectant must be precisely maintained.

The Residual Chlorine Dioxide system features a unique membrane covered polarographic sensor that does not require the addition of chemical reagents. All that is needed is a constant flow of water across the face of the sensor and this is provided by a simple constant head flowcell. The sample water is unaffected by the measurement and can be safely discharged back into the process.

The Q45H system has no moving parts, so there are not pumps or motors that burn out or tubing breaks that create maintenance nightmares. All normal maintenance items are included with each system.

The Q45H/65 system responds to chlorine dioxide with minimal interference from any residual chlorine that may be present.

A standard feature of the Q45H is a PID control function. To use this function, the primary 4-20 mA output from the monitor must be assigned for PID control. Control setpount and PID variables for proportional, integral and derivative are easily entered using front panel push buttons. The isolated 4-20 mA output can then be used as the control input to any metering pump with analog input capability. While not suitable for systems with rapid flow changes requiring compound loop control, the Q45H PID function can handle many stable flow applications.

The Model Q45H/65 Residual Chlorine Dioxide system can easily be converted into a dual measurement system. A special pH sensor can be used to allow the monitor to display both chlorine dioxide and pH. The isolated analog outputs can also be configured to track the dual parameters. Calibration and configuration of both parameters is done through the Q45H/65 user interface. This feature allows the user to add a pH measurement system at approximate half the price of a stand alone system.

The Q45H/65 is designed for exceptional flexibility to meet a variety of monitoring applications. In it simplest form, the unit is a loop powered transmitter operating from standard 24 VDC power supplies. This means easy integration into many DCS, PLC and SCAD systems. Loop powered instruments include the PID output function.

For applications where the second analog output is desired or where alarm relay functions are needed, an AC powered system is available. Operation from AC power allows the user to utilize analog outputs for both chlorine dioxide and pH or for independent PID and chlorine dioxide outputs or simply for chlorine dioxide and temperature outputs.

For even greater versatility, a portable unit powered by a standard 9V battery is also available. The dual 0-2.5 VDC outputs are assignable to chlorine dioxide concentration and temperature. This instrument can be supplied with an internal data logger, making it ideal for short term monitoring at remote sites. The unit will run for 10 days on a single battery and the data logger will store up to 32,000 data points, easily enough for 10 days of data at 1 minuted intervals.

Features

• No Costly Reagents Required: The Q45H will save you money when you buy it, as well as for years afterwards.
• Loop Powered, AC or Battery Versions: For chlorine dioxide measurement only, a loop powered system is available. AC powered versions provide for PID, relay and dual output functions. A unique battery operated unit with internal data logger is also available.
• Large, Dual Line Display: Large, high contrast display for easy viewing of chlorine dioxide concentration. Second line scrollable through pH, temperature and other information
• Dual Measurement Capability: On AC powered units, choose the optional pH sensor and get outputs for both chlorine dioxide and pH.
• PID Control Output: Standard PID control function can be configured quickly and easily.
• Two Alarm Relays: AC operated systems provide two relays that are configurable for either "control mode" or "alarm mode" of operation.
• Flexible Range Capability: Standard Q45H monitors are programmable for display ranges of 0-2, 0-20, 0-200 ppm with analog outputs scalable within the display range to any desired value. For low level applications, a display range of 0-200 ppb may also be selected.
• Universal Enclosure: NEMA 4X (IP-66) enclosure is suitable for panel, wall or pipe/header mounting.

Specifications - Monitor

Display Range	0-200.0 ppb, 0-2.000 ppm, 0-20.00 ppm, or 0-200.0 ppm
Accuracy	±0.02 ppm or 0.5% of FS
Repeatability	±0.01 ppm or 0.3% of FS
Linearity	0.1% of full scale
Zero Drift	< 0.01 ppm per month
Display	Large 4 digit main display, 0.75" characters, 12 digit alpha numeric second line display
Power	16-35 VDC for loop powered unit, 115/230 VAC 50/60 Hz, 10 VA max, 9 volt battery operated portable
Control Relays	Two SPDT relays, 6A., 250 VAC 5A@24VDC, resistive
Relay Mode	Programmable for control or alarm function
Analog Output	Isolated 4-20 mA, 550 ohms max load. Two assignable 4-20 mA outputs, 550 ohms max (AC only)
Data Logger	Battery version only, stores 32,000 data points
Operating Temperature	-20 to 60°C
Operating Humidity	0-95% non-condensing
Enclosure	NEMA 4X (IP-66) polycarbonate wall, panel or pipe mount
Weight	5 pounds

Specifications - Sensor

Sensor	Membrane covered polarographic sensor
Wetted Materials	Noryl and 316 stainless steel
Sensor Cable	25' standard, 100' maximum
Response Time	90% in 60 seconds
Temperature Limits	0-50°C
Flowcell Material	Clear Acrylic
Sample Flow Rate	7-15 GPH
Sample Inlet	¼" id hose barb
Sample Outlet	½" id hose barb

Ordering Information

For pricing please call AFC International at 800-952-3293, 219-987-6825 or fax 219-987-6826 or email sales@afcintl.com.

Downloads

Model Q45H/65 Chlorine Dioxide datasheet