Troubleshooting

The 4 - 20 mA output provides a limited set of information for diagnostic purposes. Additional troubleshooting steps are outlined below.

Table 5 General Troubleshooting Guide

Indication	Action
Sensor IR source does not flash	Verify sensor and facility wiring according to the installation section and then reapply power
Sensor IR source is flashing but no 4 ‑ 20 mA signal	Verify sensor and facility wiring according to the installation section and then reapply power.
FAULT mA output	Check power supply and restart. Check to ensure that the calibration cap was not left on the sensor for an extended time.
OBSCURATION mA output	Verify optical path is not obscured or perform the cleaning procedure below.
Elevated gas reading when no gas is expected to be present	Clean the optical window and mirror using the cleaning procedure below. Apply zero gas to see if reading drops to zero. If it does not, then perform Zero and Span calibration.
Unstable 4 mA signal after power on and warm up	Verify input voltage is between 20 - 30 VDC. If input voltage is within specification, check for noise on the input power cabling.
mA ouptut current does not change when gas is applied	Verify that gas flow path is unobstructed. Visually inspect the gas inlets and the regulator. Verify that you are not in calibration mode or any of the defined mA output levels shown in chapter Remote Controller and Menu Sequence. Verify that the device is not in Fixed Current Mode (Commanded via HART).
Calibration cap span fails	Pull the cap off and evacuate gas from the calibration cap. Retry the calibration procedure and verify the Zero calibration was successful. If Zero calibration returns “✓” and the Span calibration fail, verify adequate span gas and flow. Verify that the Span gas is applied within the 30 second window. Check the o-ring integrity to ensure a good seal between the sensor and the calibration cap. Check the cap for damage.
Calibration cap rapidly flashes all icons during start-up	The calibration cap battery is nearing the end of its useful life. The calibration cap will continue to operate until the battery is consumed.
Known gas concentration response is incorrect	Calibrate. If calibration fails, remove power and reapply. Verify span gas flow rate and cylinder accuracy. Verify environmental guard and/or flow cap are not obstructed. Verify line load is according to electrical installation chapter Electrical Installation. Verify ambient temperature range is appropriate for the device rating.
One source not flashing	The PrimaX IR+ is designed to meet all specifications with only one source. Source status is available through HART communication. See HART manual for details. Perform standard calibration. No further action required.