MSA PrimaX IR, Руководство по эксплуатации

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PrimaX® IR
22
Start-up and Calibration
GB
(5) The calibration cap display indicates the zero gas cylinder symbol and flashes, indicating that
the device is in Zero Calibration mode.
The initial 30 seconds is intended to give the user time to apply gas to the sensor. During
this time, the user can abort the process by removing the calibration cap.
After the initial 30 seconds, the device will start the Zero calibration adjustment. The Zero
Calibration is indicated by the white cylinder (see Fig. 13) and the word "Zero".
Removal of the calibration cap after the initial 30 seconds will result in a calibration fault. This
will abort the present calibration and the device will continue to operate with the previous
calibration settings.
(6) Apply zero gas to the calibration port at an approximate flow rate of 1.5 LPM while the cylinder
symbol is flashing. Zero gas can be supplied as ambient air or from the zero gas cylinder in the
calibration kit as noted in chapter 4.3.
Fig. 13 Zero Gas Cylinder Symbol
(7) When the Zero calibration is successful, the checkmark 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 “
 ”.
(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 (see Fig. 12).
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.
Fig. 14 Span Gas Cylinder Symbol
(10) When the Span calibration is successful, the checkmark symbol “  ” will appear. If the Span cali-
bration fails, an X will be displayed for approximately 2 minutes, and the device will then power
down.
See chapter 5 for subsequent action upon calibration failure.
(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.
(12) 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.