PN 9000-280-VE, Rev B
Diagnostics Flowcharts
This section shows you how to check different analyzer areas for possible
problems. See the “Alarm and Warning Messages” section for assistance on cor-
rective action to perform based on the Alarm or Warning message displayed.
If you don’t see an Alarm or Warning message, but your readings appear to be
inaccurate, check for sample system plugs (see “Plugged Plumbing Check” later
in this chapter, and check the Diagnostic Flowcharts below.
AMETEK recommends monitoring the Thermocouple millivolts and Cell mil-
livolts be displayed during troubleshooting as a troubleshooting aid. This infor-
mation will be helpful should you need to contact the factory for assistance. Be
sure to always include your analyzer model and serial number when contact-
ing AMETEK for technical support.
Diagnostic checks are discussed in the following pages:
Use care when working on the analyzer. Turn off power, allow the unit
to cool, and wear gloves.
Thermocouple Checks
Possible Cause
Corrective Action
Open Thermocouple
Remove power to the analyzer. Measure across terminals
+TC-
on the
Sensor
board with an ohm meter. If an open is measured,
replace the thermocouple.
Shorted/Failed Thermo-
couple
Check that the thermocouple leads are not shorted to chassis
ground by using an Ohm meter to measure between terminal
TC+
on the
Sensor
board and chassis ground, and between
terminal
TC-
on the
Sensor
board and chassis ground. If shorted,
replace the thermocouple.
To verify the operation of the thermocouple itself, remove the
thermocouple from the analyzer and heat its ceramic tip to a
known temperature. Measure the millivolt output with a proper
temperature indicating meter (Type K Thermocouple). If the
thermocouple reads inaccurately, replace it.
Reversed Thermocouple
Wires
First, view the Cell temperature via the Home screen or Diagnos-
tic screen. If the thermocouple leads are reversed, the displayed
temperature will be decreasing as the analyzer warms up (this
will usually happen at start-up or after you replace a thermo-
couple). This indicates that the thermocouple wiring is reversed.
If you just replaced a thermocouple, check the leads from the
thermocouple to the
Sensor
board: yellow wire connects to
terminal
TC (+)
, red wire connects to terminal
TC (-)
.
3-6 | Thermox
®
WDG-V UOP ATEX-IECEx Analyzer
Содержание WDG-V UOP
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Страница 96: ...PN 9000 280 VE Rev B WDG V UOP Series Analyzer Rating Labels 4 6 Thermox WDG V UOP ATEX IECEx Analyzer...
