17
Installing the Oxygen Sensor
The GPR-2500/2500MO Oxygen Transmitter is normally equipped with an integral oxygen sensor. It has been
tested and calibrated by the manufacturer prior to shipment and are fully operational from the shipping container.
However, when the application requires a remote sensor (external to the electronics enclosure) or other special
circumstances, the oxygen sensor will be packaged separately and must be installed prior to operating the
transmitter. If the sensor has not been installed at the factory, it will be necessary to install the sensor in the field.
Caution: All transmitters must be calibrated once the installation has been completed and periodically thereafter
as described below. Following the initial installation and calibration, allow the transmitters to stabilize for 24 hours
and calibrate with certified span gas.
Caution: DO NOT open the oxygen sensor. The sensor contains a corrosive liquid electrolyte that could be harmful
if touched or ingested, refer to the Material Safety Data Sheet contained in the Owner’s Manual appendix. Avoid
contact with any liquid or crystal type powder in or around the sensor or sensor housing, as either could be a form
of electrolyte. Leaking sensors should be disposed of in manner similar to that of a common battery in accordance
with local regulations.
Caution: Do not change the factory settings until instructed to do in this manual.
Integral Oxygen Sensor:
1.
Remove the four (4) screws securing the top section of
the enclosure, set them aside for reinstallation and raise
the hinged top section 180º until it locks in place.
2.
Caution: Do not remove or discard the gaskets from
either the enclosure or junction box. Failure to reinstall
either gasket will void the NEMA 4 rating and RFI
protection.
3.
The transmitters design provides protection from RFI
that is maintained by leaving specific mating areas of the
enclosure unpainted to maintain conductivity the gasket,
top and bottom sections of the enclosure. These
unpainted areas are protected by gaskets and contribute
to maintaining the NEMA 4 rating. Do not paint these
areas. Painting will negate the RFI protection.
4.
Remove the oxygen sensor from the bag.
5.
Screw the oxygen sensor into the sensor flow housing,
equipped with elbows and tubing, finger tighten plus one
half (1/2) turn to ensure a good seal from the o-ring
affixed to the sensor.
6.
Remove the shorting device (looped wire) from the receptacle located at the rear of the sensor. Minimize the
time the sensor is exposed to ambient air.
7.
Assure the keyway registration of the female plug on the cable and male receptacle on the sensor match up.
8.
Push the female plug (including the knurled lock nut) molded to the cable into the male receptacle attached to
the new sensor.
9.
Screw the knurled lock nut attached the cable onto to the male connector attached to the sensor, tighten
finger tight plus ¼ turn.
