Q45N monitors are available in two versions, one that includes all components conveniently integrated into a NEMA 4X fiberglass enclosure and a second that separates the monitor from the chemistry system for applications where a more convenient display location is desired. A sample inlet filter assembly attached to the sie of the enclosure allows filtered sample to be drawn from the inlet flow. Sample must be pumped to the inlet assembly at a rate high enough to insure the desired response time for the measurement system. Excess sample is bypassed to any convenient drain location.

The electronic display and alarm package provides the user interface to the system. Ammonia concentration is displayed on a large format LCD display with secondary display for other operating variables. Operating ranges for the ammonia monitor are 0-2 or 0-20 ppm, with a low end resolution of about 0.05 ppm. Response time to changes in ammonia concentration is less than 60 seconds to 90% of a step change in concentration, making the system much faster responding than competitive monitors. Two programmable alarm relays are available for local alarm functions and two analog 4-20 mA output signals are provided for interface to plant DCS, telemetry or other supervisory instrumentation.

ATI's Q45N monitoring package for dissolved ammonia provides the measurement stability needed to avoid complicated automatic calibration systems. Unlike typical ammonia SIE sensors subject to significant drift problems, the amperometric sensor provides excellent repeatability for long periods of time. And because the measurement utilizes chloramine conversion for measurement, the sample is inherently subjected to biocidal conditions, eliminating long term biofouling on the sensor.

This new ammonia system represents a major step forward in providing users with a monitor that is both simple to operate and economical to purchase, selling for 50% of the cost of many competitive ammonia monitors.

Chloramination Process Monitoring

Chloramination is increasingly being used in potable water systems to limit THM formation and insure disinfection in large distribution systems. Proper control of this process requires the addition of sufficient ammonia to insure that only monochloramine is formed while limiting the amount of excess ammonia to a minimum.

An enhanced version of the Q45N Dissolved Ammonia Monitor is available that provides an excellent tool for monitoring the chloramination process. This system employs two separate sensors, the first measuring monochloramine and the second measuring total ammonia after reagent addition. From these measurements, the monitor will calculate "Free Ammonia" concentration, which effectively is the excess ammonia that has not combined with chlorine.

This Free Ammonia version can provide two separate 4-20 mA outputs and those outputs may be programmed to track Free Ammonia, Total Ammonia or Monochloramine concentration. For chloramination systems, it provides operating personnel with continuous confirmation that the process is running correctly or warns of process problems.

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