Troubleshooting & Maintenance
Hardware Manual B
–9
Table B-1 Potential instrument problems and their solutions (Continued)
Symptom Response
Temperature too Low or Temperature
too High fault (Continued)
If the temperature reading is incorrect,
check that the pressure/temperature
cable is tight. Check the connector on
the cell temperature sensor. Check the
temperature connector on the back-
plane board. (NOTE: A temperature
reading greater than 150 °C indicates a
short circuit on the temperature sensor
leads; a reading of less than –40 °C
indicates an open circuit).
Front panel display is not lit and no char-
acters appear
Check for correct voltage on terminal
block input. Observe polarity on DC
powered units.
Check for correct voltage after fuses.
Check for 5 VDC on red wires, 12 VDC
on yellow wires, and 24 VDC on orange
wires from power supply.
Check connections on display commu-
nication and power cables.
Strange characters appear on front panel
display
Check connections on display commu-
nication cable.
Pressing keys on front panel do not have
specified effect
Check connections on keypad cable.
System stuck in Fit Delta Exceeds Limit
restart for greater than 30 minutes
Refer to “Service Contact” on page
B-11 for information.
Not getting enough flow to the sample cell Check both the micro filter and mem-
brane separator for contamination.
Replace if necessary.
Check if supply pressure is sufficient.
No reading on device connected to cur-
rent loop
Make sure that connected device can
accept a 4-20 mA signal. The analyzer
is set to source current. Refer to the
Firmware Manual.
Make sure the device is connected to
the correct terminals (see Table 2–1 on
page 2–4).
Check the open circuit voltage (35-
40 VDC) across the current loops ter-
minals (see Table 2–1 on page 2–4).
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