Calibration. Sierra Monitor Corporation 5100-04-IT, 5100-05-IT, 5100-03-IT, 5100-26-IT, 5100-10-IT, 5100-88-IT

Model 5100-XX-IT Toxic Gas Sensor Module

CALIBRATION

6.1 Calibration Frequency

The Gas Sensor Module has been calibrated in the factory prior to shipment. It is recommended that the user calibrate before placing into service. The sensor module must be calibrated every 180 days at a minimum.

Periodic functional tests are advisable for critical applications and hostile environments. Oxygen sensors will require more frequent adjustment.

The sensor module microprocessor software includes high-level self-checking algorithms which provide continuous sensor diagnostic and self-adjustment. Users may select to increase calibration frequencies based on low-drift experience during first two calibration periods.

6.2 Calibration Preparation

Calibration of the sensor 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 [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 gas of interest. When in doubt, use a portable instrument to confirm that there is no background.

For compliance with Factory Mutual (FM) Approvals, the Sierra Monitor Model 1250-01, 1260 -05 and 1260-45 are the FM Approved calibration gas delivery devices. Use the Model 5358-01 Calibration Adapter delivery fitting.

NOTE: Refer to Appendix H.1

for information on use of permeation tube for 5100-25-IT and Appendix H.2

for 5100-26-IT calibration.

6.3 Calibration Gas Delivery Methods

Calibration gas can be delivered to the sensors via the Model 5358-01:

Calibration Adapter ( Figure 21 ) - used with portable calibrators.

Calibration Procedure

The Calibration Menu is described on Figure 22 .

The procedure 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 21: Model 5358-01

Calibration Adapter

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