Model
6. CALIBRATION
6.1CALIBRATION FREQUENCY
The sensor module must be calibrated every 180 days. Periodic functional tests are advisable for critical applications and hostile environments.
The sensor module microprocessor software includes
6.2CALIBRATION 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 “Operate Mode” 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 Hydrogen Sulfide gas. When in doubt, use a portable instrument to confirm that there is no background Hydrogen Sulfide gas.
For compliance with Factory Mutual (FM) Approvals, the Sierra Monitor Model
6.2.1 CALIBRATION GAS DELIVERY METHODS
Calibration gas can be delivered to the sensors via the Model
CALIBRATION PROCEDURE
The Calibration Menu is described on Table
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.
6.2.2 SENSOR EXPOSURE TO GAS
Calibration gas must be delivered to the sensor using the flow rate and duration listed in below:
Model | Gas | Flow | Period |
Carbon Monoxide | 300 cc/min | Until Stable (minimum 3 minutes) | |
Hydrogen Sulfide | 300 cc/min | Until Stable (minimum 3 minutes) | |
Chlorine | 300 cc/min | Until Stable (minimum 3 minutes) |
Sample Gas In
Figure
Model
Calibration Adapter
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