Troubleshooting - Michell Instruments Easidew Portable HP User Manual

Easidew Portable HP User's Manual
5.6

Troubleshooting

Symptom
Display shows "
Display shows "
Display shows "
Display flickers on
and off.
Michell Instruments
Cause
ErrI Sensor disconnected
"
or sensor tile / sensor
thermistor fault.
NOTE: This error is
normally displayed
during the first few
seconds while the
instrument is starting
up.
ErrL " Sensor reading under-
range.
Sensor current signal
< 4mA
Sensor tile open circuit.
" Sensor reading over-
ErrH
range.
Sensor current signal >
20mA
Sensor tile short circuit.
Battery voltage low.
MAINTENANCE
Actions
Check sensor cable is securely
connected inside instrument.
Check instrument electronics with
4-20mA source.
Exchange sensor.
Check instrument electronics with
4-20mA source.
Exchange sensor.
Sensor may have been exposed
to saturation conditions or liquid
contamination. Check that filter and
sensor guard are clean and dry.
If liquid water has contacted sensor,
or sensor block, then disassemble
and dry thoroughly. After drying, it
is recommend to purge assembled
instrument with very dry (-75°Cdp
(-103°Fdp) / 1ppm moisture) air for
V
12 to 24 hours.
Exposure to other contaminants can
cause lasting damage and may require
sensor to be exchanged.
Check instrument electronics with
4-20mA source.
Connect charger.
13