MSA PrimaX IR+ Operating Manual page 22

5 Start-up and Calibration
During device operation, the 4 - 20 mA output signal is updated once/second and provides the information shown
below:
4-20 mA Output Levels (Default Values)
OPERATION
SAFETY CRITICAL FAULT
*FAULT
*OBSCURATION OR DIRTY
OPTICS
*POWER UP OR -SENSOR -
CALIBRATION
*CLEANING MODE
NORMAL
OVERRANGE
* Output levels are customer configurable between 2.0 - 3.5 mA via the HART interface See the PrimaX IR HART
specification document (10125187), which can be found on the product page https://msasafety.info/PrimaXIRPlus, for
more information.
Transient Fault conditions will be automatically cleared when the unit recovers from the fault condition.
MSA recommends verifying proper response to changes in mA outputs by using the "Enter Fixed Current Mode"
command described in the PrimaX IR Link Help Guide to check the four fault conditions noted with a * above. These
checks should be done at every calibration phase.
Calibrations
WARNING!
• Read all calibration instructions before attempting an actual calibration.
• Use zero gas when zeroing the device if there is any possibility of background gas. Otherwise, improper
calibration could occur.
• For optimal sensor performance, allow sensors to acclimate to application conditions before performing an initial
calibration.
• Perform calibrations 24 hours after initial start up and at regular intervals as detailed in this manual.
• You must calibrate the PrimaX IR sensor with either the target gas or the Span Gas indicated in
sensor to be accurate for the target gas.
• The device must be calibrated after changing the gas table and/or span value.
Failure to follow these warnings can result in serious personal injury or death.
Identify and become familiar with all of the calibration components. Assembling the calibration components before
starting the calibration process will make it easier. Carry out the calibration during commissioning as well as at regular
intervals. This ensures optimum operation of the sensor.
The calibration must be done at regular intervals in accordance with applicable national and regional regulations.
The device is calibrated at the factory. Nevertheless, it is recommended to recalibrate the device after installation. New
sensors shall be calibrated more often until the calibration records prove sensor stability.
The calibration frequency can then be reduced to the schedule set by the safety officer or plant manager.
22
4 - 20 mA
0.0 mA
2.0 mA
2.5 mA
3.0 mA
3.5 mA
Gas value scaled
from 4 - 20 mA
for 0 - 100 % LEL
20.0 - 20.5 mA
Definition
Sensor failure.
Communications not available to sensor
Problem detected.
Status available via HART interface
Light path is blocked
Unit power was recently applied or calibration in
process with Cal Signal Enabled
Defined in chapter 6.4 Cleaning
> 100 % LEL gas is detected by the device
Table 3 for the
US