
ENMET Corporation
80003-503
Original April 2011
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Page 1 of 2
Guide for MRI-5175 Sensor Replacement
An Oxygen sensor must be replaced when it can no longer be calibrated. Typical sensor life is 3 to 5 years in a 20.9%
oxygen environment.
To replace a sensor, perform the following steps:
Turn off the electrical power.
Open the display panel and remove the four cover (lid) retention screws and remove the lid. See Figure 1.
Remove the old O
2
sensor, by unscrewing it, and replace it with a new sensor. See Figure 1.
Replace cover(lid) with retention screws.
Turn on the electrical power.
Wait 3 – 4 hours, then recalibrate the sensor per the instructions.
MRI-5175 Exterior View
(Optional)
MRI-5175 Lid, Interior View
Sensor Wiring
J8 Sensor Wires
V+
Not Used
Sig
Red wire
Gnd
Black wire
Figure 1: MRI-5175 Sensor Replacement
Figure 2: Calibration MRI-5175
O2 Sensor
To J8
Terminal J8
Power/Fault LED
on Sensor
Calibration Gas
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