Model Q45H/62-63 Residual Chlorine
Monitor from Analytical Technology

The Model Q45H is designed for on line monitoring and control of chlorination systems. It is available in two versions: a free chlorine monitor for drinking and cooling water systems and a combined chlorine monitor ideally suited for "chloraminated" drinking water. The combined chlorine system can also be used in wastewater effluents where sufficient ammonia is present prior to chlorination to result in a predominantly monochloramine residual. Unlike on line colorimetric and most amperometric monitors, Q45H systems utilize a membrane covered polargraphic sensor that does not require the addition of chemical reagents. That means no more costly reagents to purchase or flowcells that require frequent cleaning. All that is needed is a constant flow of water across the face of the sensor, provided by a simple constant head flowcell.

The Q45H system has no moving parts, so there are no pumps or motors that burn out or tubing breaks that create maintenance nightmares. All normal maintenance items are included with each system.

The Q45H chlorine monitoring system is easy to operate, requires minimal maintenance and will not eat a hole in your operating budget with on going reagent requirements or component replacement costs.

Features

• No Costly Reagents Required: The Q45H will save you money when you buy it, as well as for years afterwards. You will also improve the work environment by eliminating the storage, handling and disposal of chemical reagents and the organic waste produced by DPD colorimetric analyzers.
• Lower Your Maintenance Costs: The Q45H has no moving parts, so you do not have to replace worn out tubing or failed pump modules.
• Automatic pH Compensation: Eliminate Free Chlorine error caused by process pH drift with the optional pH compensation feature. Available with loop power or AC versions.
• 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.
• Dual Measurement Capability: On AC powered units, choose the optional pH sensor and get outputs for both chlorine and pH. This feature is available with either the Free of Combined Chlorine monitors
• Free of Combined Chlorine Measurements: Monitor is programmable for either type of measurement with simple sensor conversion.
• PID Control Output: Standard PID control function can be configured quickly and easily.
• 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.

The residual chlorine sensors are available in two configurations: flowcell and submersion. The Free Chlorine sensor should always be used in the flowcell configuration. The Constant Head Flowcell is used to maintain a constant flow rate and pressure at the face of the sensor. The sample inlet flow rate and pressure can vary widely without affecting the measurement. The only requirement is that the sample inlet flow rate be at least 7 gallons per hour. A Low Volume Flowcell is available for clean water application with a flow rate of 3-6 gallons per hour. The Combined Chlorine sensor can be used in either the Flowcell or Submersion configuration. The submersion sensors require flow velocities of at least 0.4 ft/sec for proper operation.

For many applications, process pH is relatively stable and nothing more than the standard monitor and sensor are needed. However, when the pH of the water stream varies regularly, a significant error in free chlorine concentration is introduced. This error is due to the sensitivity of the membraned sensor to wide pH fluctuations.

With the simple addition of an optional pH sensor, the Q45H will automatically correct for these changes, maintaining accurate measurement even when pH varies widely or is up near a pH of 9. With AC version, this option provides a second analog output that can be assigned to pH, converting the chlorine monitor into a two parameter system, providing isolated 4-20 mA outputs for both chlorine and pH. Both Free and Combined Chlorine monitors can be converted to dual output monitors.

The Q45H 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.

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AFC International, Inc.
PO Box 894, DeMotte, IN 46310
715 SW Almond St, Ste C, DeMotte, IN 46310
800-952-3293 219-987-6825 Fax 219-987-6826
eMail: sales@afcintl.com

Last Revised: 1/23/07