Teledyne BDS-3000 - Oxygen analyzer - Manual (Page 84)

Maintenance BDS 3000
Teledyne Analytical Instruments 70
5.6 Cleaning
If the instrument is unmounted at time of cleaning, disconnect the
instrument from the power source. Close and latch the front-panel access
door. Clean outside surfaces with a soft cloth dampened slightly with
plain clean water. Do not use any harsh solvents such as paint thinner or
benzene.
For panel-mounted instruments, clean the front panel as prescribed
in the above paragraph. DO NOT wipe front panel while the instrument
is controlling your process.
5.7 Troubleshooting
Symptoms Possible causes and Solutions
Read higher than expected (1), (2), (3)
Read lower than expected (2), (3)
Read negative (3), (4)
Noise signal (3), (5)
Slow response (5)
Causes and solution keys:
(1) Gas leak: Make sure to use new VCR gaskets, high quality
valves and gas regulator for the sampling system. Tighten each
connection.
(2) Improper gas flow rate: adjust the inlet pressure to obtain 0.5 –
1 SLPM flow rate.
(3) Improper calibration of the analyzer: Turn the analyzer off,
then turn back on again. Press the SYSTEM key when prompted
by the analyzer “Press the System for default Values”. This will
return the analyzer to its defaults settings in calibration and zero
values. Recalibrate the analyzer with a high quality standard gas
if it is necessary.
(4) Just after adding water: The analyzer will recover by itself.
(5) Gas entered and is trapped in the sensor: This could happen if
the sensor is filled with the electrolyte improperly, or the sensor
is pressurized because of a clogged vent. To remedy this