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7 - 26 Installation, Operations, and Maintenance Manual
The MART Corporation Standard Turntable Power Washer v.
4
.0
4.1. Theory of Operation
The Chemical Conductivity Controller system consists of the following:
·
Conductivity controller
·
Electrode-probe
· Peristaltic pump
· Tubing
For the system to function properly, the concentration of your chemical must be
proportional to its conductivity.
The system measures conductivity with electronics connected to a probe immersed in
the washer's cleaning solution. A concentrated chemical is added by a pump to
maintain the conductivity of the solution at the selected set point.
The conductivity controller uses a set point for the minimum allowable conductivity.
When the electrode probe senses that conductivity has fallen below the set point
you have selected, it closes a relay. If the relay closes while the wash pump is
operating, the
peristaltic pump activates and pumps concentrated chemical solution into
the washer's reservoir. Concentrate is only added during the wash cycle, so that mixing
occurs. When the probe senses that
conductivity has risen above the set point , the
controller relay opens. This prevents the peristaltic pump from adding concentrate.
The peristaltic pump turns rollers, which squeeze concentrate through the precision-
bore, high-tolerance tubing in a wave-like motion, acting like a positive-displacement
pump. The concentrate comes in contact
only with the tubing, not the pump. The pump
is self-priming and non-siphoning.
The probe is mounted to the end of a tube. This tube is used to insert the probe into the
pump suction tube. The probe can be removed without draining the washer.
Fig. 7 - 12: Chemical
Conductivity Probe