Quality Monitoring and Control

TM 55-1905-223-24-7

The permeate is collected and salinity tested, then piped into the ship fresh water storage tanks. Brine concentrate is also

collected and piped overboard.

1-14. Quality Monitoring and Control. The water quality monitor (3, FIGURE 1-6, Sheet 1), is a solid state electronic

module which continuously monitors the product water quality via the signal received from the salinity probe sensor.

Increased salinity in the product water increases the conductivity of the water sample between the electrodes of the probe.

A set point is established in the circuitry connected to the probe so that when the conductivity of the product water drops to

the set point level, a holding voltage is applied to the diversion valve solenoid for delivery of the product water into the

ship's fresh water system. Increased salinity automatically deenergizes the valve so that the water is dumped via the brine

manifold. Red (low quality) and green (high quality) lamps on the monitor panel show the operator at a glance the

condition of the solenoid valve.

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