Det-Tronics PIRVOLHV Volumetric Infrared Hydrocarbon Gas Process Monitor for Heavy Hydrocarbons - Manual (Page 10)

8 3 .1 95-8632
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 PIRVOLHV has been wired
properly.
3. Apply power to the system and allow the
PIRVOLHV 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 PIRVOLHV.
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 PIRVOLHV,
resulting in elevated gas concentration
readings.
Use only silicone-based grease (not
hydrocarbon-based grease) when lubricating
threads on the PIRVOLHV and associated
termination 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.
Table 2—Troubleshooting Table
Current Level Status Corrective action
2.4 to 3.9 mA Negative Zero Indication 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 Repeat zero calibration. If the condition persists,
replace electronics assembly.
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.