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M1000002 V1.2 - 11/2021
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3.3
Pressure Sensor
Pressure sensors use a G1/4 hydraulic interface to the machine hydraulics.
The ram full side pressure transducer, and the optional reverse side (rod side) pressure
transducer, must measure the pressure in the lift ram at all times. Therefore, the measuring
point must be on the ram side of any hose burst check valves that may be fitted. This port
is often designated with an ‘E” stamped into the valve body. If in doubt check. [Note hoses
should be fitted with restrictors (typically with a 0.75mm hole) to control the rate of descent
of the boom in the event of failure of the balance hose].
The pressure sensors should be mounted in such a position that the electrical connector may
be accessed and the cable securely routed. The mounting position should also protect against
damage caused by persons climbing the machine or other objects striking the machine.
Typical pressure transducer installations.
3.4 Alarm
The alarm is wired as a relay change over contact output and uses 3 wires in the Series
1-L Display power cable. The output has a limited current capability of 1A. Any alarm that
exceeds this current capability will need to be controlled via another relay.