Monitor Operation
22 E
3
Point Gas Monitor Technical Manual
Set Span menu
WARNING: If the calibration gas concentration exceeds alarm setpoints,
alarms will be triggered. Either change alarm levels so the alarms are not
triggered, or put the entire system in service mode so no external equipment
(lights, fans, ventilators, buzzers) will be activated.
Only use the Set Span function when inspection or calibration maintenance
indicate that it is necessary. See Periodic Inspection and Maintenance.
This option allows users to calibrate the sensor’s span. In the main Set
Span screen, press enter to begin. If there is a remote sensor connected,
you must scroll to select Z1 (built-in sensor) or Z2 (remote sensor).
* Menu *
Set Span
Set Span
Z1
Before starting calibration, connect the regulator to the gas cylinder.
• Adjust the flow rate to 0.5 L/min.
• Connect the tubing from the regulator to the sensor calibration
cap. See Figure 4.
• Let the gas flow for at least 2 minutes before starting the
calibration.
If the gas is not allowed to flow for at least 3 minutes, it will affect the
calibration accuracy.
The next screen allows you to specify the span calibration gas
concentration value.
Set Gas
200 ppm
• Use the arrow keys to increase or decrease the value and press
enter to select.
• The next screen requests confirmation.
Set Span
Yes
• Press enter to confirm and the screen displays the concentration
during calibration.
Set Span
198 ppm
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