L H ENVIRONMENTAL

Laser Pure

Roseburg, OR

PARTICLE COUNTERS

Data you Can Count On

Turbidity monitoring of filtered potable water provides an excellent indicator of water clarity as well as a reliable measure of general filter efficiency. Recent studies, however, indicate that particle count data can provide additional information concerning filter operation, and often can provide an early warning of filter breakthrough before turbidity values begin to rise. In addition, particle count data can indicate breakthrough of particles in the Cryptosporidium (5-7 micron) or Giardia (9-11 micron) size ranges before any change in turbidity can be detected.

On line particle measurement can be an extremely valuable operating tool for any water plant striving to meet increasingly stringent surface water treatment regulations. The response of treatment processes to changes in chemical addition can be measured with high sensitivity, helping to optimize suspended solids removal. Filter backwash operations can be monitored to ensure that particle counts have declined to low levels before the filter effluent is again allowed into the distribution system. Log removals can be easily monitored on individual filters and recorded to document system operation. These and other benefits of particle monitoring can easily be incorporated into any water treatment monitoring system.

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Particle Measurement

The Model A10/77 Particle Sensor is designed to provide valuable particle data by continuously monitoring particle counts in raw water, filter influent, or filter effluent. Based on a laser light blocking principle, this sensor will provide particle count data over size ranges from 2 to 200 microns, with three 4-20 mA analog outputs and an RS-232/485 digital output supplied as standard. The three 4- 20 mA outputs may be scaled for ranges of 0-100 to 0-25,000 counts per milliliter, with one channel

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