Troubleshooting; Error Messages; Error Messages Flashing Over Displayed Values; Figure 26 Error Message Line - Michell Instruments Liquidew EExd User Manual

Liquidew EExd User's Manual
4.4

Troubleshooting

4.4.1

Error Messages

If a system errors occur, an error message will appear at the bottom line of the MAIN
Page describing the problem. If more than one system error has occurred, the error
messages associated with those faults will continually scroll in turn.
Error Message
DEWPOINT UNDER RANGE
DEWPOINT OVER RANGE
TEMPERATURE OUT OF
RANGE
LOW FLOW
HIGH FLOW
SATURATION
CAL TABLE ERROR
INTERNAL HEATER FAULT
4.4.2

Error Messages Flashing over Displayed Values

A short message will flash over the displayed value in the MAIN Page, in certain
conditions, as indicated below:
Flashing Message
error
error
under
over
error
Michell Instruments
DEWPOINT
3.9
TEMPERATURE
55.4
TEMPERATURE OUT OF RANGE
Figure 26 Error Message Line
Description and Possible Causes
Dew point <-120°C (<-184°F) or sensor tile failure
Dew point >+30°C (>+86°F) or sensor tile failure
Temperature >+50 or <0°C (>+122 or <32°F)
Flow through sensor measurement cell is <0.1 l/min
(0.03 GPM) or flow meter has failed / disconnected
Flow through sensor measurement cell is >2.6 l/min
(0.69 GPM)
Dew point is greater than or equal to temperature
Fault with sensor calibration data
Internal temperature set-point not achievable or fault
with the internal temperature control devices
Over Value
Dew-point or
moisture content
Dew-point or
moisture content
Dew-point or
moisture content
Dew-point or
moisture content
Temperature
0 Cdp
C
0
Condition
Moisture saturation condition (dew point ≥
temperature)
Calibration table error (checks sensor
impedance values are increasing in the
correct direction)
Dew point under range <-120°C (<-184°F)
Dew point over range >+30°C (>+86°F)
Sensor temperature fault <-40 or >+70°C
(<-40 or >+158°F)
MAINTENANCE
31