209Service Manual – CS7010™ 30 - Solution System
Solution Pressure Sensor
The level in the solution tank is detected with a
remote-read pressure transducer located on the Main
Machine Control board. The weight of the water
column in the solution tank produces a pressure
greater than the local atmospheric pressure. The
sensor detects this difference in pressure and
mathematically converts it into a water depth
reading.
Because the control board and sensor are located
above the bottom of the solution tank, a sensor
tube serves to convey this pressure up to the
control board. The weight of the water in the tank
compresses the air that is in the sensor tube, and
this air pressure is what pushes against the sensor.
This is why it is important that the sensor tube be lled with air before it is connected to the solution tank.
If it were lled with water, the weight of that column of water would cancel out some of the weight of the
water column in the solution tank. Because air is compressible and water is not, it should be noted that some
water will enter the sensor tube when the solution tank is full. This is what creates the pressure in the tube.
For example, if you were to open the tubing joint, shown above, while the solution tank was full, the water
column in the tubing would equalize to the height of the water level in the tank, but no pressure would
be inside the tubing. If you then sealed this tubing by reconnecting the joint, that would establish a new
zero-pressure height. If you then drained the solution tank, the sensor would then begin seeing negative
pressures in the tubing.
Solution Pump (EcoFlex™ Models Only)
The Solution Pump is mounted
underneath the rear right-hand side of the
solution tank and pumps the solution to
the solution solenoid valve.
Low Pressure (Wash Hose) Pump
The optional low pressure (wash hose)
pump is mounted next to the solution
pump underneath the rear right-hand
side of the solution tank. The low pressure
pump pumps solution to the optional wash
hose behind the operator seat.
Sensor
Tubing
J1
Connector
J2
Connector
Solution
Pump
Low
Pressure
Pump
Solution
Shutoff Valve
(shown on)
Solution
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