5-6 | Thermox TM2000 Oxygen Analyzer
See the “Remote Calibration Unit Connections” section in the Installation
chapter for help on how to trigger an automatic calibration using a digital
input. When using a digital input to trigger the auto calibration, you must
make sure that the Setup Key/Remote Switch Config selection is set to
calibrate, and not verify.
If you replaced a cell, or your cell has failed a regular calibration
because of a deteriorating cell, you will need to perform a primary
calibration rather than a regular calibration. See the “Primary Cali-
bration” section in the Chapter 4 for help.
See the Chapter 3, Installation, for calibration gas requirements.
Auto Calibrate
• Enterthecalibrationgasvaluetomatchthezerocalibrationgascylin-
der you intend to use to calibrate your system.
• Definehowlongyouwantthecalibrationgastoflowthroughthesen-
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.
• Defineatimeperiodforthesystemtorecoverfromreadingthecali-
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.
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