19
300710168_002_C1 - 01/2018 - © Leybold
FAQ (Frequently Asked Questions)
Fault finding Guide
Symptom
Possible cause
Remedy
LED not lit
Incorrect electrical
supply
voltage.
Supply
polarity
reversed.
Check
electrical
supply
and
connections
Pressure reading incorrect
Vacuum leak
Leak check vacuum
system
Tube has drifted
and
requires
adjustment
Perform
the
atmosphere
and
vacuum adjustments
Tube contaminated
Replace the tube
Gauge indicates error voltage
Adjustment
has
been attempted at
an
inappropriate
pressure
Repeat
the
adjustment but make
sure that the pressure
is at atmosphere or
good vacuum
New tube has been
fitted
Perform ‘Adjustment
for new tube’
Tube has drifted
outside permissible
limits and can no
longer be adjusted
Replace the tube
Tube is missing
Fit
the
tube
and
remove then re- insert
the
electrical
connector
Filament is broken
Replace the tube
Storage and disposal
Dispose of the TTR 91 R and any components safely in accordance with all local and national safety and
environmental requirements.
Particular care must be taken if the TTR 91 R has been contaminated with dangerous process substances
For the benefit of the environment, at the end of life of the transmitter, it should not be disposed in
the normal unsorted waste stream. It should be deposited at an appropriate collection point or facility
to enable recovery or recycling.
Attention
!
