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6 Maintenance
6
Maintenance
6.1
General
WARNING!
• All maintenance procedures must be performed on a clean surface using clean tools. Avoid touching the lamp's
window as well as the metalized portion of the Cell Assembly with bare fingers. Fingerprints left on these parts
may adversely affect the sensors operation. Latex gloves are recommended, but if they are not used, hands must
be clean and free of oils, lotions, etc. It is acceptable to hold the lamp by its glass body or by the edges of the
window.
• Before working on the device, turn off the power and secure against restart. Ensure no hazardous atmosphere is
present. Otherwise electrical shock or ignition of a hazardous atmosphere could occur.
• Remove and reinstall sensors carefully, ensuring that the components are not damaged; otherwise device
intrinsic safety may be adversely affected, wrong readings could occur, and persons relying on this product for
their safety could sustain serious personal injury or death.
Failure to follow these warnings can result in serious personal injury or death.
There are NO field repairable internal components for this IR sensor. Return to MSA for warranty replacement per the
Warranty section
1.4 MSA Permanent Instrument
Do not attempt to open the enclosure of the IR sensor, it is factory sealed for protection from hazardous environments.
If the troubleshooting guides in chapters
alleviate the problem, contact your MSA representative.
6.2
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
Verify sensor and facility wiring according to the installation section and then reapply power
does not flash
Sensor IR source
is flashing but no
Verify sensor and facility wiring according to the installation section and then reapply power.
4 - 20 mA signal
Check power supply and restart. Check to ensure that the calibration cap was not left on the
FAULT mA output
sensor for an extended time.
OBSCURATION
Verify optical path is not obscured or perform the cleaning procedure below.
mA output
Elevated gas
reading when no
Clean the optical window and mirror using the cleaning procedure below. Apply zero gas to see if
gas is expected to
reading drops to zero. If it does not, then perform Zero and Span calibration.
be present
Unstable 4 mA
Verify input voltage is between 20 - 30 VDC. If input voltage is within specification, check for noise
signal after power
on the input power cabling.
on and warm up
mA ouptut current
Verify that gas flow path is unobstructed. Visually inspect the gas inlets and the regulator. Verify
does not change
that you are not in calibration mode or any of the defined mA output levels shown in chapter
when gas is
Remote Controller and Menu
applied
(Commanded via HART).
Pull the cap off and evacuate gas from the calibration cap. Retry the calibration procedure and
Calibration cap
verify the Zero calibration was successful. If Zero calibration returns "✓ " and the Span calibration
span fails
32
Warranty.
6.2 Troubleshooting
and
6.3 HART Information for Troubleshooting
Sequence. Verify that the device is not in Fixed Current Mode
do not
5.1
US
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Table of Contents
Troubleshooting
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