MIL-HDBK-740
Figure SA - Detergent Concentration Meter
(h) Automatic detergent dispenser (Single, Multiple). - The automatic detergent dispenser should conform to the requirements of
MIL-D-43729 (Figure 9). It consists of an electrical control unit, a low voltage solenoid valve, detergent reservoir) sensing electrode or conductivity cell, copper tubing, and wiring to form a complete automatic dispensing
system. The units are adjustable to maintain a detergent concentration of
0.15 to 0.40 percent by weight and automatically feed and maintain a detergent
concentration of the wash solution between 0.20 and 0.25 percent by weight.
The electrical control unit registers changes in the conductivity of the wash solution as sensed by the electrode. As the concentration of the detergent solution is weakened by dilution or by neutralization, the resistance to the
flow of electrical current is increased. This increase in electrical resistance
or a decrease in detergent concentration below a preset concentration actuates the automatic dispensing mechanism by opening the solenoid valve. When this valve is opened, water enters the reservoir. The addition of water causes the saturated solution in the reservoir to overflow into the wash tank. When the desired detergent concentration is attained, the water valve closes. The control unit has also an "ON" and "OFF" switch for operating the unit, a white light to indicate that the unit is operating, and a red light and buzzer to indicate that more detergent should be added to the reservoir. Two different
types of reservoirs are available. One is mounted on the top of the dishwashing
machine and the other is mounted on the side of the machine or on a nearby wall.
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