MSA PrimaX IR+ Operating Manual page 30

5 Start-up and Calibration
When a Zero or Span calibration failure occurs, the device reverts back to its previous successful calibration settings.
If the calibration cap is left on for more than 15 minutes after calibration concludes, the 4 to 20 mA signal indicates Fault
status.
When the calibration cap battery is nearing the end of its useful life, the LCD will display all the icons in a series of rapid
flashes at power-up before it starts the normal calibration cycle. The battery is non-serviceable and the calibration cap
would need to be replaced once the battery is depleted.
WARNING!
The calibration cap must be removed from the device after completing the Zeroing and/or Spanning procedure. Failure
to do so could restrict gas flow to the sensor and result in erroneously low readings.
Failure to follow this warning can result in serious personal injury or death.
HART Calibration Procedure
The device can be calibrated using a HART compatible communications interface with Device Description capability
(DD), such as the Emerson 375 or 475 Field Communicator ( →
communicator is compatible with the area classification. This hand-held HART communicator must be HART revision
7.0 compliant and can be obtained from a HART authorized supplier. See the PrimaX IR HART specifications
document (10125187), which can be found on the product page https://msasafety.info/PrimaXIRPlus, for more
information.
Calibration can also be performed via the HART interface with optional screen inserts in the Environmental Guard. The
environmental guard can be fitted with these screens that will allow the calibration gas to be retained in the enclosure
long enough for a valid zero and/or span reading to be obtained under still-air conditions
WARNING!
Use of the insect screens can increase the sensor response time to ambient gas conditions. Ensure that the conditions
are appropriate for use of these screens.
Failure to follow this warning can result in serious personal injury or death.
When supplying tubing to the environmental guard to allow remote HART calibration, gas should be delivered to both
ports of the environmental guard from a 1.5 l/min regulator (→
Figure 18 HART Calibration Set-up
1 Insect screens
When used under windy conditions, a calibration cover must be used instead of the environmental guard while applying
the zero and span gas.
For a picture of the cover see
30
Figure 19 .
Figure 13 ). Ensure that the HART hand-held
(→Figure 18
Figure 18 ):
).
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