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ATI Models Q45H62 and Q45H63 are reagentless and designed for on-line monitoring and control of chlorination systems. It is available in two versions: a free chlorine monitor for drinking water and cooling water, 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 polarographic sensor that does not require the addition of chemical reagents.  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 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 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 1-3 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.

When the pH of the water stream varies regularly, a significant error in free chlorine concentration is introduced.  With the simple addition of an optional pH sensor, the Q45H will automatically correct for these changes up to a pH of 9.  With AC version, this option provides a second analog output that can be assigned to pH or temperature, converting the chlorine monitor into a dual parameter system.  Both Free and Combined Chlorine monitors can be converted to dual output monitors.

This line of microprocessor based instrumentation allows for easy implementation as a loop-powered transmitter, line powered analyzer, or portable battery powered unit within the same instrument.