Rae MultiRAE Plus PGM-50/4, Руководство пользователя

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Maintenance 33
Sensor Replacement
Under normal operating conditions, most sensors will lose their original
sensitivity after the expected operating life and eventually need to
be replaced. Each sensor has a non-volatile memory that has the
manufacturing and expiration dates, which appear during the warm-up
period or can be looked up in the diagnostic mode.
Warranties : Oxygen (O
2
), combustible gas (LEL), hydrogen sulfide
(H
2
S) and carbon monoxide (CO) sensors all have a 2-year warranty.
All other toxic sensors have a 1-year warranty.
NOTE: The Oxygen and the LEL sensors have assigned sockets.
These are identified on the PCB. High bias toxic sensors should be
installed in socket 1/A. Refer to Special Bias Voltage for Toxic Sensors
on page 35. Any toxic sensor can be installed in socket 2/B.
Replace the sensor when it fails to calibrate.
To replace sensor(s), turn the monitor off
and remove the cover.
Using the sensor puller, remove the sensor
to be replaced by carefully pulling straight
out.
Plug a new sensor into the empty socket.
Make sure the sensor pins are aligned with
the socket holes before firmly pushing the
sensor all the way down.
Replace the monitor cover.
Turn on the power of the monitor and
the newly installed sensors should be
recognized. Let the monitor run for 15
minutes before calibration.
Some sensors, like NO and NH3, require up to 24 hours on-bias in the
monitor prior to calibration and use. Refer to Techincal Note 114 Sensor
Specifications and Cross Sensitivities.
NOTE: Calibrate all sensors prior to use!