Ametek Thermox CEM O2/TM, User Manual

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5-6 | Thermox CEM O2/TM
Auto Calibrate
• Enter the calibration gas value to match the zero calibration gas cylin -
der you intend to use to calibrate your system.
• Define how long you want the calibration gas to flow through the sen -
sor (Set Cal Timers/Cal Gas Duration). Remember that with an auto
calibration, the RCU automatically shuts down the zero calibration
gas based on the calibration gas duration time you specify. Be sure to
allow enough time for the gas to stabilize. You may want to use the
“Inject Cal Gases” option from the Calibrate menu to determine how
long it takes for the gas from the remote calibration unit (RCU) to
reach the sensor and stabilize and then use this time.
• Define a time period for the system to recover from reading the cali -
bration gas value to reading process gases (Set Cal Timers/Recovery
Duration).
Start the auto calibrate as follows:
1. Select the Initiate Cal option from the Calibrate key menu.
2. Select Auto Calibrate.
The system will begin the automatic calibration and will notify you
how long the span gas will be applied to the sensor from the RCU:
Spam Gas xx:xx
System Calibrating
Then the following message will appear on the display:
Zero Gas xx:xx
System Calibrating
During this time, the RCU has switched the solenoid valves and has
introduced the zero gas to the sensor.
Then the system will display the recovery time remaining:
Recovery xx:xx
The system then returns to monitoring process readings, and the
calibration is complete. You can view the results of the last calibration
using the Cal/Verify Data menu option from the Calibrate key menu.