4.1
STARTUP PROCEDURE
NOTE
Caution should be exercised when applying
this and any electronic device to explosive
vapor extraction and measurement applications.
Typical hazards in these applications include
small fitting vapor leaks, resulting in dangerous
gas concentrations near or within the system
enclosure. Any spark or arc may result in a fire
or explosion in these conditions. Always inspect
all fittings for leakage before commissioning, and
always remove power from all electronic devices
before performing maintenance on the vapor
extraction system tubing, fittings, and hardware.
1. Inhibit the output loads that are actuated by the
system to prevent activation of these devices.
2. Check that the PIRVOL has been wired properly.
3. Apply power to the system and allow the PIRVOL
to operate for a minimum of 2 hours, then check
zero and verify gas response.
4. Place the system in normal operation by
reactivating the output loads.
TROUBLESHOOTING
Refer to Table 2 to isolate and correct malfunctions
with the PIRVOL.
MAINTENANCE
It is recommended to have spare IR Modules on hand
(see “Spare Parts” section). Use Table 2 to isolate and
correct malfunctions.
IMPORTANT MAINTENANCE NOTES
• Hydrocarbon-based grease emits hydrocarbon
vapors, which will be measured by PIRVOL,
resulting in elevated gas concentration readings.
Use only silicone -based grease (not
hydrocarbon-based grease) when lubricating
threads on the PIRVOL and associated
junction box.
A suitable grease is listed under
“Spare Parts” in the Ordering Information section
of this manual.
• It is recommended to keep spare IR modules
(See “Spare Parts” section) for field replacement
in the event of a malfunction.
9
95-8522
Current Level
Status
Corrective action
2.4 to 3.9 ma
Negative Zero Indication
NOTE:
This fault can be caused by the presence of background gas
during calibration. Ensure that background gas is not present and
recalibrate the unit. If fault does not clear, perform disassembly
and cleaning procedure, then recalibrate. If fault still does not clear,
replace electronics assembly.
1.6 ma
Calibration fault
Make sure that the calibration gas being used matches the Gas
Selection Switch setting. If these match and the fault is still present,
perform disassembly and cleaning procedure, then recalibrate.
1.0 ma
Fouled optics
Perform disassembly and cleaning procedure, then recalibrate.
0.8 ma
+24 vdc line low (less than +17.5 vdc)
Ensure that input voltage is correct and that power connections are
good. If fault does not clear, replace the electronics assembly.
0.6 ma
Calibrate input active at power-up
Ensure that calibration line is not shorted and that the calibration
switch is open. If fault does not clear, replace the unit.
0.4 ma
Active channel fault
Replace electronics assembly.
0.2 ma
Reference channel fault
Replace electronics assembly.
0.0 ma
CPU system fault, warmup
Ensure that power is applied and that the warmup period is complete
(1 minute). If fault does not clear, replace the unit.
Table 2—Troubleshooting Table
