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Model 5100-XX-IT Toxic Gas Sensor Module
Page: 24
5. CALIBRATION
5.1 CALIBRATION FREQUENCY
The 5100-XX-IT has been calibrated in the factory prior to shipment. It is recommended that the user check
calibration before placing in service. The toxic sensor module must be calibrated every six months. Periodic
functional tests are advisable for critical applications and hostile environments.
The sensor module microprocessor software includes high level self checking algorithms which provide
continuous sensor diagnostic and self adjustment. Users may elect to increase calibration periods based on
low drift experience during the first two calibration periods.
5.2 CALIBRATION PREPARATION
Calibration of the Toxic Gas Sensor Module is accomplished by simple menu based steps and application of
span gas.
NOTE
If an error is made during any stage of the calibration process, hold the magnet stick at the
Switch [M] for 10 seconds. A scrolling display will indicate “Calibration aborted” and the
sensor module will exit the calibration activity and return to normal operating mode. The
calibration procedure can then be restarted
Calibration must be performed only when the area is known to be clear of the applicable toxic gas. If
necessary, use a portable instrument to confirm that there is no background toxic gas.
For compliance with Factory Mutual (FM) Apparatus, the Sierra Monitor Model 1250-01, 1256-01, 1260-XX are
the only FM Approved calibration gas delivery device. Use Model 5358-00 or 5358-01 Calibration Adapter or
Model 5360-00 Gas Delivery Fitting.
5.2.1 CALIBRATION GAS DELIVERY METHODS
Calibration gas is can be delivered to the sensors via the following delivery devices:
Model 5358-00: Calibration Adapter - used with portable calibrators. See 5-1.
Model 5360-00: Calibration Gas Delivery fitting - permanently installed fitting which
allows tubing to be run to a convenient delivery location
5.3 CALIBRATION PROCEDURE
Table 5-1 shows the step by step process of the calibration procedure.
The procedures requires that the menu “keys” be activated using the magnet stick.
Each key press steps through the process of setting the zero value for clean air and
then setting the span value.
At each of these steps, apply calibration gas of the value corresponding to the
setting accepted on the sensor module display.
Figure 5-1
Model 5358-01 Calibration
Adapter
Sample Gas In