MSA PrimaX IR+ Operating Manual page 28

5 Start-up and Calibration
Figure 15 Zero Gas Cylinder Symbol
7. When the Zero calibration is successful, the tick symbol "✓ " will appear. If only performing a Zero calibration,
remove the calibration cap. Following a successful zero, the span process will automatically begin within 30
seconds following the zero symbol "✓ ".
8. If the Zero calibration fails, the display will show an X for approximately 2 minutes, and will then power down.
○ If the Zero calibration fails, remove the calibration cap and reinstall to start another zero attempt. If multiple
failures occur, contact an authorized MSA service center.
9. When the display flashes the span gas symbol, apply the span gas through the calibration cap port (→
).
○ The unit must see gas within 30 seconds after the span symbol starts to flash or a calibration fault may
occur. The initial 30 seconds are intended to give the user time to apply gas to the sensor. During this time,
the user can abort the Span process by removing the calibration cap.
○ The display will then flash at a faster rate to indicate active calibration by the sensor.
Figure 16 Span Gas Cylinder Symbol
10. When the Span calibration is successful, the tick symbol "✓ " will appear. If the Span calibration fails, an "X" will
be displayed for approximately 2 minutes, and the device will then power down.
○ See chapter
11. When calibration is complete, stop the gas flow and remove the calibration cap. Reconnect the environmental
guard or flow cap to the sensor. The calibration cap will automatically power down once removed from the sensor.
The 4 - 20 mA is held at the sensor calibration level for two minutes to reduce the chance of a nuisance alarm
upon completion of a calibration procedure.
○ During calibration and this 2 minute period, the unit will not be detecting any gas in the ambient area.
• Alternately, the device can be commanded via HART to track the gas level during calibration (see the Calibration
Signal Enable/Disable command in the HART Specification).
○ Once the calibration cap is removed it can take up to two minutes for gas to diffuse and the device to read
normal ambient levels.
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6 Maintenance for subsequent action upon calibration failure.
Figure 11
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