MSA PrimaX IR+ Operating Manual page 27

Target Gas
n-Pentane
1
IEC/UL/EN 80079-20-1 was used as bases for converting test and calibration gas concentrations from % LEL to %
volume fraction
2
For the measurement of n-Pentane, n-Hexane, Propylene, Ethane or Isobutane PrimaX IR shall be calibrated with the
target gas at a span value of approximately 50% LEL.
Calibration Cap Procedure
1. Remove the environmental guard from the device.
2. The calibration cap is equipped with a slot for an optional tether retention system. The figure below shows the
location of the tether slot.
Figure 14 Calibration Cap
1 Tether slot
3. If the user can confirm that the ambient air is free of combustible gas, ambient air can be used in place of the zero
gas cylinder. For a visual representation of the calibration process see (→
4. Install the calibration cap. Press firmly to ensure cap is properly seated.
○ The calibration process will start automatically when the cap is fully seated on the sensor housing.
○ Under normal conditions, the display will show all icons steady at power-up.
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 (→
○ 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 (→
US
100% Performance
1
LEL
Approved
Range
1.10% 0-30%
Figure 15
Measuring Calibration
Range Gas
0.55%v/v n-
0-100%
Pentane
Figure 17
) and the word "Zero".
5 Start-up and Calibration
Span t50 t90 Gas
2
Value
Cal
Curve
No.
≤ 11 ≤ 24
50% 2
s s
).
5.3 Calibration Kits).
27