COSA Xentaur Xentaur XDTL-HT - Manual (Page 35)

Maintenance
35
Troubleshooting
Symptoms Solutions
Dewpoint reading is consistently
higher than expected Check all connections for leaks. Make sure that no plastic,
rubber, or Tygon tubing is used.
Dewpoint reading is lower than
expected The laser may be mistuned. Run TruTune™ tuning manually
(Measurement
> Dewpoint > Tune) with a gas sample at least
5000 ppm of moisture. Tuning process takes 2-3 minutes.
Screen is flashing Temperature
Too Low Set the secondary reading to display sample temperature.
If reading is -128.3°C, check the cable connection J5 on the
control board and check cable connector for any sign of
damage. Once problem is correct select Reset Alarms on
menu. If cable is damaged or cable is properly connected,
replace temperature sensor assembly.
Screen is flashing Temperature
Too High You may get this error during the first 90 minutes after startup.
The PID controller to the instrument heater may have overshot
the setpoint temperature. The controller is configured in 25°C
ambient temperature at the factory; its settings may produce
larger overshoot in hotter environment. In such case, re-tune
PID controller 1, starting with reducing Proportional value.
Verify the Sample Temperature > High Alarm value is set above
PID > Channel 1 > Setpoint value with room for overshoot.
Menu item does not take new
value Changing some items on the menu require appropriate access
level. Log in using administrator password to gain full access to
the menu.
Keypad is not responding The touch keys require sufficient surface contact to work. Try
pressing down the key with the finger instead of tapping it
with fingertip.
Screen is flashing Analog Output
Error If instrument is configured for current output, make sure that
the current loop is hooked up to the DCS system. The
instrument will give error on an open loop to signal a cable
breakage. If unsure whether the loop is opened, try measuring
the current with a multimeter. There is a cable breakage if the
error disappears when the output is being measured.
Make sure that the output + and – signals are not shorted.
Remove cable to the analog output and check for short circuit
at the cable end.