Troubleshooting - Kahn Easidew Plus User Manual

Easidew Plus Portable Hygrometer User's Manual
5.6

Troubleshooting

Symptom
Display shows "
Display shows "
Display shows "
Display flickers on
and off
Display off but
battery meter full
Kahn Instruments
Cause
Sensor disconnected or
sensor element / sensor
thermistor fault.
NOTE: This error is
ErrI
"
normally displayed
during the first few
seconds while the
instrument is starting
up.
Sensor reading under-
range.
Sensor current signal
ErrL "
< 4mA.
Sensor element open
circuit.
Sensor reading over-
range.
Sensor current signal >
ErrH 20mA.
"
Sensor element short
circuit.
Battery voltage low.
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 (-103°Fdp
(-75°Cdp) / 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.
Connect charger.
15