Teledyne 326, 327 and 328 - Oxygen analyzers - Manual (Page 33)

Teledyne Analytical Instruments
Operations Operations Operations Operations Operations Model 326/327/328 Model 326/327/328 Model 326/327/328 Model 326/327/328 Model 326/327/328
4-5
To prevent generating ambiguous alarms during calibration, simply
unlock and rotate the set point dial (or dials) until the limits of travel in the
NORMAL (rather than ALARM) direction have been attained. After sample
flow has been re-initiated, and the proper scale of analysis selected, the alarm
point can be precisely reset by simply re-dialing the set point.
4.8 Calibration of Converter-Equipped Instruments 4.8 Calibration of Converter-Equipped Instruments 4.8 Calibration of Converter-Equipped Instruments 4.8 Calibration of Converter-Equipped Instruments 4.8 Calibration of Converter-Equipped Instruments
Note: Note: Note: Note: Note: The current output spans 4 to 20 mA corresponding to zero to full The current output spans 4 to 20 mA corresponding to zero to full The current output spans 4 to 20 mA corresponding to zero to full The current output spans 4 to 20 mA corresponding to zero to full The current output spans 4 to 20 mA corresponding to zero to full
scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If
scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If scale WITHOUT REGARD TO WHICH RANGE THE ANALYZER IS IN. If
the current output is being used to drive a device which must have its
the current output is being used to drive a device which must have its the current output is being used to drive a device which must have its the current output is being used to drive a device which must have its the current output is being used to drive a device which must have its
input scaled to the particular analysis range, the customer will be
input scaled to the particular analysis range, the customer will be input scaled to the particular analysis range, the customer will be input scaled to the particular analysis range, the customer will be input scaled to the particular analysis range, the customer will be
required to provide the necessary electrical or mechanical interlocks.
required to provide the necessary electrical or mechanical interlocks. required to provide the necessary electrical or mechanical interlocks. required to provide the necessary electrical or mechanical interlocks. required to provide the necessary electrical or mechanical interlocks.
When calibrating, remember the following points:
1. With instruments that are attached to recorders, use the recorder
during calibration to improve accuracy. (Most recording
equipment is linear to ±0.25% or better.)
2. Make sure that the sample path flowrate is maintained at 2 SCFH
(1000 ml/min).
Note: Note: Note: Note: Note: Although the output of the cell is entirely independent of the sample Although the output of the cell is entirely independent of the sample Although the output of the cell is entirely independent of the sample Although the output of the cell is entirely independent of the sample Although the output of the cell is entirely independent of the sample
flowrate, the response and recovery is not. To achieve the response
flowrate, the response and recovery is not. To achieve the response flowrate, the response and recovery is not. To achieve the response flowrate, the response and recovery is not. To achieve the response flowrate, the response and recovery is not. To achieve the response
and recovery time that is specified on the application information
and recovery time that is specified on the application information and recovery time that is specified on the application information and recovery time that is specified on the application information and recovery time that is specified on the application information
page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/
page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/ page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/ page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/ page in the Appendix, the flowrate must be at least 2 SCFH (1000 ml/
min).
min). min). min). min).
3. Check to be sure that you have placed the range switch on the
position that will give you the best possible resolution of the
sample gas after calibration has been completed.
4.9 Special Shutdown for A-3 Cell 4.9 Special Shutdown for A-3 Cell 4.9 Special Shutdown for A-3 Cell 4.9 Special Shutdown for A-3 Cell 4.9 Special Shutdown for A-3 Cell
CAUTION: CAUTION: CAUTION: CAUTION: CAUTION: When the Analyzer is equipped with a Class A-3 cell, it must be When the Analyzer is equipped with a Class A-3 cell, it must be When the Analyzer is equipped with a Class A-3 cell, it must be When the Analyzer is equipped with a Class A-3 cell, it must be When the Analyzer is equipped with a Class A-3 cell, it must be
protected from prolonged exposure (more than four hours) to CO
protected from prolonged exposure (more than four hours) to CO protected from prolonged exposure (more than four hours) to CO protected from prolonged exposure (more than four hours) to CO protected from prolonged exposure (more than four hours) to CO
2 2 2 2 2
-----
free atmospheres (such as air). free atmospheres (such as air). free atmospheres (such as air). free atmospheres (such as air). free atmospheres (such as air).
The cell can be protected from lack of CO
2
by trapping CO
2
-containing
sample (flue gas) by closing the input manifold valves and sealing the vent
connection with a valve, water trap, or clamped-off plastic tubing.
4.10 Routine Operational Maintenance 4.10 Routine Operational Maintenance 4.10 Routine Operational Maintenance 4.10 Routine Operational Maintenance 4.10 Routine Operational Maintenance