Start-up and Calibration

Remote Controller and Menu Sequence

Initial Start-up

The device is factory-calibrated and ready for use. The device provides a 4 - 20 mA output signal that can be used in conjunction with data acquisition controllers. The digital HART signal that is superimposed on the 4 - 20 mA output can be read by control systems that are in compliance with HART Revision 7.0 format.

During device operation, fault codes E-01 through E-06 are from the PrimaX IR sensor. Use HART communicator to determine specific fault code. Fault codes E-07 through E-28 are notifications from the display module only, and the analog 4-20 mA output from the sensor will not be affected.

Table 2

Sensor Fault Code Analog Output Description Meaning
E-01 0.0 mA Safety Critical Fault Sensor Failure
E-02 2.0 mA General Fault Instrument fault
E-03 2.5 mA Dirty Optics Dirty sensor optics
E-04 3.0 mA Power Up - Sensor Calibration Start-up/Calibration
E-05 3.5 mA Cleaning Mode Sensor cleaning mode (defined in chapter Cleaning)
E-06 20.5 mA Overrange Sensor Overrange
Display Fault Code Description Meaning
E-07 Flash - Self Check Fault Power on Flash Check failed
E-08 RAM - Self Check Fault Power on RAM Check failed
E-09 CRC Fault CRC on information block failed
E-10 WDT Fail Watchdog failure
E-11 ADC Fault ADC measurement failure
E-12 Temp Sensor Fail Temperature failure
E-13 Relay Fault Relay failure
E-14 Task Fault Task fault
E-15 Relay SPI Fault SPI relay comms failure
E-16 Information Flash Write Fault Flash write failure
E-17 External Reference Check Fault External reference out of range
E-18 Periodic Flash Check Fault Periodic flash CRC failure
E-19 Periodic RAM Check Fault Periodic RAM check failure
E-20 ADC12 Stuck High Fault ADC12 stuck high
E-21 ADC10 Stuck High Fault ADC10 stuck high
E-22 Periodic PC Check Fault PC check failure
E-23 Periodic Stack Check Fault Stack check failure
E-24 Periodic Register Check Fault General register check failure
E-25 Periodic SFR Check Fault Special function register check failure
E-26 Periodic Voltage Check Fault Failed voltage check
E-27 Interrupt Fault Interrupt error
E-28 RAM Data Fault RAM data failure

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

4 - 20 mA

Definition

SAFETY CRITICAL FAULT

0.0 mA

Sensor failure.
Communications not available to sensor

*FAULT

2.0 mA

Problem detected.
Status available via HART interface

*OBSCURATION OR DIRTY OPTICS

2.5 mA

Light path is blocked

*POWER UP OR -SENSOR -CALIBRATION

3.0 mA

Unit power was recently applied or calibration in process with Cal Signal Enabled

*CLEANING MODE

3.5 mA

Defined in chapter Cleaning

NORMAL

Gas value scaled
from 4 - 20 mA
for 0 - 100 % LEL

  

OVERRANGE

20.0 - 20.5 mA

> 100 % LEL gas is detected by the device

* 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 Table 3 for the 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.

Signal

NOTE: Before attempting calibration the device should be powered for at least 60 minutes to allow for temperature stabilization.

The 4 - 20 analogue signal is available within 1 minute of power-on.

NOTE: It is recommended that all calibration components are connected before starting a calibration as it is necessary to apply test gas at the appropriate time (→ Figure 17 ).

Although the device is factory-calibrated, it is good practice to calibrate the unit once it is installed in its final environmental destination.

As with any type of gas monitor, the only true check of its performance is to apply gas directly to the sensor. New sensors should 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.

For span gas selections see chapter Calibration Kits.