Teledyne 2010A - Split architecture thermal conductivity analyzer - Manual (Page 48)

4 Operation Model 2010A
4-14 Part I Teledyne Analytical Instruments
####.## % H2 — N2
Slope=#.### S—Zero
Generally, you have a good zero when Slope is less than 0.05 ppm/s for
about 30 seconds.
Once zero settling completes, the information is stored in the analyzer’s
memory, and the instrument automatically returns to the Analyze mode.
4.4.1.3 Cell Failure
Cell failure in the 2010A is usually associated with inability to zero the
instrument with a reasonable voltage differential across the Wheatstone bridge. If
this should ever happen, the 2010A system alarm trips, and the VFD displays a
failure message.
Cell cannot be balanced
Check your zero gas
Before replacing the sensor:
a. Check your zero gas to make sure it is within specifications.
b. Check for leaks downstream from the sensor, where contamina-
tion may be leaking into the system.
c. Check flowmeter to ensure that the flow is no more than
200SCCM
d. Check temperature controller board.
e. Check gas temperature.
If none of the above as indicated, the sensor may need to be replaced.
Check warranty, and contact Analytical Instruments Customer Service.
4.4.2 Span Cal
The Span button on the front panel is used to span calibrate the analyzer.
Span calibration can be performed in either the automatic or manual mode.
CAUTION: If you are spanning the Cal Range by itself (multiple
application analyzers only), use manual mode
zeroing.
If you want to calibrate ALL of the ranges at once
(multiple application analyzers only), use auto mode
spanning in the Cal Range.
Make sure the span gas is flowing to the instrument.