Teledyne 326, 327 and 328 - Oxygen analyzers - Manual (Page 32)

Teledyne Analytical Instruments 4-4
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5) Connect analyzer input to the sample gas and retrim the throttle
valve for an indicated flowrate of 2.0 SCFH, or insert probe
holder back into its holder.
Note: Note: Note: Note: Note: Analyzer accuracy is not affected by variations in sample flowrate. The Analyzer accuracy is not affected by variations in sample flowrate. The Analyzer accuracy is not affected by variations in sample flowrate. The Analyzer accuracy is not affected by variations in sample flowrate. The Analyzer accuracy is not affected by variations in sample flowrate. The
recommended flowrate of 2.0 SCFH insures maximum speed or
recommended flowrate of 2.0 SCFH insures maximum speed or recommended flowrate of 2.0 SCFH insures maximum speed or recommended flowrate of 2.0 SCFH insures maximum speed or recommended flowrate of 2.0 SCFH insures maximum speed or
response.
response. response. response. response.
6) Select the range of analysis that will provide the best possible
resolution of the oxygen content of the sample gas.
7) Allow sample gas, not calibration air, to flow through the
analyzer. For best results, let sample gas flow through the
analyzer for 24 hours. This allows the Micro-Fuel Cell to
equilibrate.
Important: Important: Important: Important: Important: It is particularly vital to the condition of the A-3 cell employed in It is particularly vital to the condition of the A-3 cell employed in It is particularly vital to the condition of the A-3 cell employed in It is particularly vital to the condition of the A-3 cell employed in It is particularly vital to the condition of the A-3 cell employed in
flue gas (or high CO
flue gas (or high CO flue gas (or high CO flue gas (or high CO flue gas (or high CO
2 2 2 2 2
-content applications) that the cell not be -content applications) that the cell not be -content applications) that the cell not be -content applications) that the cell not be -content applications) that the cell not be
exposed to a CO exposed to a CO exposed to a CO exposed to a CO exposed to a CO
2 2 2 2 2
-free environment for a prolonged period of -free environment for a prolonged period of -free environment for a prolonged period of -free environment for a prolonged period of -free environment for a prolonged period of
time. time. time. time. time.
4.6 Operational Calibration 4.6 Operational Calibration 4.6 Operational Calibration 4.6 Operational Calibration 4.6 Operational Calibration
After the 24-hour equilibration period following the installation of any
new cell, or whenever it is desirable to recheck the calibration of the instru-
ment, use the following calibration procedure:
1) Place the range selector switch on the 0-25% position.
2) Connect the analyzer input to a supply of calibration (span) air
and adjust the flowrate to 2.0 SCFH.
3) Unlock and adjust the span control until the meter pointer is in
precise coincidence with the scale calibration mark and relock the
span control.
4) Return the instrument to service by restoring sample flow at the
proper rate (2.0 SCFH), and selecting the range that provides the
best possible resolution of the sample oxygen.
4.7 Calibration of Alarm Equipped Instruments 4.7 Calibration of Alarm Equipped Instruments 4.7 Calibration of Alarm Equipped Instruments 4.7 Calibration of Alarm Equipped Instruments 4.7 Calibration of Alarm Equipped Instruments