Model 9060Z Manual
11. GAS CALIBRATION CHECK AND PURGE
The oxygen sensor that is used in the Teledyne Analytical Instruments oxygen probe is extremely predictable, stable and reliable. For this reason, the calibration of a Teledyne Analytical Instruments oxygen system does not require the use of calibration gases. However, all Teledyne Analytical Instruments oxygen probes have a built in gas connection that does allow the accuracy of the probe to be checked in‐situ. This chapter describes the operation of this gas checking system.
The 9060Z has a timer and solenoid driving system that can be configured to admit a certified calibration gas into the probe or an air supply to purge the probe filters through the gas connection. Both the calibration gas and the filter purge gas must be piped to the port on the probe labeled “CAL”. There are two solenoids drivers in the 9060Z transmitter. They can be used for any combinations of gas checking and probe filter purging. The only limitation is that if the transmitter is in dual probe mode, then solenoid #1 must be wired and plumbed to the probe #1 and solenoid #2 must be wired and plumbed to probe #2.
The transmitter can also be configured to be in a MANUAL or AUTOMATIC purge and gas check mode.
Function # | Function Description | Options |
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20 (29) | Solenoid 1 | (2) | Operation | Calibration Gas / Purge | √ | √ | √ |
21 (30) | Solenoid 1 | (2) Auto / Manual | Automatic / Manual | √ | √ | √ | |
22 (31) | Solenoid 1 | (2) | Start Time | 00:00 to 23:45 |
| √ | √ |
23 (32) | Solenoid 1 | (2) | Period | 1 hour – 7 days |
| √ | √ |
24 (33) | Solenoid 1 (2) Duration | 1 – 90 seconds |
| √ | √ | ||
25 (34) | Solenoid 1 (2) Post Freeze | 5 – 300 seconds |
| √ | √ | ||
26 (35) | Oxygen Content Cal Gas 1 (2) | 0.1 – 20.9% |
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| √ | ||
27 (36) | Max Cal Gas 1 (2) Positive Error | 0.1% to 3.0% |
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| √ | ||
28 (37) | Max Cal Gas 1 (2) Negative Error | 0.1% to 3.0% |
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| √ | ||
Functions available if either Calibration Gas or Purge and Manual are selected
11.1 PURGE
Functions available if Purge and Automatic are selected
Functions available if Calibration Gas and Automatic are selected
For processes that have particulate present in the gas stream, probe filters are necessary and should be back‐purged with sufficient frequency to avoid blocked filters. Select ‘Purge’ in function #20 (29) and ‘Automatic’ in function #30 and then set the times in function #22 (31) to #25 (34) The outputs can be frozen during purging if selected in COMMISSIONING menu function #19. A flow switch can be wired to terminals 16 and 17. If the flow is not sufficient at the end of the purge cycle to close the contacts of the flow switch a ‘Probe 1 (2) Filter Blocked’ alarm is generated. If a flow switch is not being used a short circuit should be placed across terminals 16 and 17 to suppress the ‘Probe 1 (2) Filter Blocked’ alarm.
11.2 CALIBRATION GAS
If it is required to automatically check the oxygen probe and transmitter on line, select ‘Calibration Gas’ in function #20 (29) and ‘Automatic’ in function #30 and then set the times in function #22 (31) to #25 (34) and the gas levels in function #26 (35) to 28 (37). If the transmitter measurement does not fall within the limits set in function #26 (35) to 28 (37) a ‘Gas1 (2) Calibration Error’ alarm will be generated. If the transmitter has ‘Automatic’ selected in function #21 (30) and one of the GAS/PURGE keys is pressed in RUN mode, the automatic cycle will be started and the alarms will be checked. The cycle can be stopped at any time by pressing the same key during the cycle.
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