New Holland CX720 Repair Manual page 1440

Proximity and Speed Sensors
Proximity and speed (RPM) sensors generally will have five ranges, as follows:
A = 0 - 0.5 v(short to ground)
B = 0.5 - 5.6 v (normal operation, no metal present)
C = 5.6 - 7.6 v (normal operation, metal present)
D = 7.6 - 9 v (open circuit)
E = >9 v (short to high voltage)
In the example shown, the Unload Tube sensor circuit is currently displaying 7.9 volts, and is in the "D" range, indi-
cating an open circuit condition exists with this circuit.
Temperature/Fuel Level Senders
Temperature and fuel level sensors will generally have four ranges, as follows:
A = 0 - 0.5 v (short to ground)
B = 0.5 - 4.9 v (normal operating range)
C = 4.9 - 5.2 v (open circuit)
D = >5.2 v (short to high voltage)
In the example shown, the Hydraulic Reservoir Temperature sender circuit is currently displaying 3.4 volts, and is in
the "B" range, indicating normal operation.
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