
ENMET Corporation ISA – M
6
4.3 Sensor Hook-up
The MOS sensor is connected to the ISA-M control unit with three conductor wiring, use the correct oiltight fitting.
Two conductors supply heater current to the sensor. The third conductor is a signal wire. Size of heater wire depends
on the distance between the particular sensor and the control unit. See Table 4.
Sensor wires correspond to the normal wire code:
orange – heater
brown – heater ground
blue – signal
Figure 4: Internal View of Sensor Wiring
NOTE: The three color-coded wiring attachments must be performed by the user when replacing the sensor.
Table 4: Recommended Wire Gauge
Distance from Sensor to Control Unit Recommended Wire Gauge
250 feet 16 AWG
350 feet 14 AWG
Longer Distances Contact Factory
CAUTION: After you mount and install the ISA – M, you must adjust the sensor heater voltage (see section 4.4).
Sensor Wiring
FOR 812 / 813 / 814 SENSORS
Position Function Wire Color
1 Signal (Blue)
2 Heater (Orange)
3 Ground (Brown)
Splash Shield
Terminal
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