Calibration Problems; Miss-Calibrated - Teledyne 300E Instruction Manual

Model 300E Carbon Monoxide Analyzer
Instruction Manual
To determine which is the case, view the Sample Pressure and Sample Flow
functions on the front panel. If the sample pressure is reading abnormally low, then
the cause is likely a flow obstruction upstream of the flow sensor. First, check the
sample filter and make sure it is not plugged and then systematically check all the
other components upstream of the orifice to ensure that they are not obstructed.
If the sample pressure is reading normal but the sample flow is reading low then it
is likely that the pump diaphragm is worn or there is an obstruction downstream of
the flow sensor.
11.2.1.5. Actual Flow Does Not Match Displayed Flow
If the actual flow measured does not match the displayed flow, but is within the
limits of 720-880 cc/min, adjust the calibration of the flow measurement as
described in Section 6.6.6.
11.2.1.6. Sample Pump
The sample pump should start immediately after the front panel power switch is
turned ON. The TEST variable VACUUM should read about 10"-Hg for a pump in
good condition. Readings above 15"-Hg indicate that the pump needs rebuilding, or
the instrument has a leak.

11.3. Calibration Problems

11.3.1. Miss-Calibrated

There are several symptoms that can be caused by the analyzer being miss-
calibrated. This condition is indicated by out of range Slopes and Offsets as
displayed through the test functions and is frequently caused by the following:
Bad Span gas. This can cause a large error in the slope and a small error in
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the offset. Delivered from the factory, the M300E's slope is within ±15% of
nominal. Bad span gas will cause the analyzer to be calibrated to the wrong
value. If in doubt have the span gas checked by and independent lab.
Dilution calibrator not set up correctly or is malfunctioning. This will also
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cause the slope, but not the zero to be incorrect. Again the analyzer is
being calibrated to the wrong value.
Too many analyzers on the manifold. This can cause either a slope or offset
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error because ambient gas with its pollutants will dilute the zero or span
gas.
P/N 04288 REV: A
TROUBLESHOOTING & REPAIR PROCEDURES
201