Ametek Thermox CEM O2/TM, User Manual

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Calibration | 5-23
Set Cal Timers - Cal Gas Duration
This menu option allows you to define how long the RCU should apply
the span and zero calibration gases to the sensor during an automatic
calibration or verification. For a verification, the system uses the span gas
inlet for the verify gas.
To find out how long it takes for your calibration gases to reach the sen-
sor and stabilize, select the Inject Cal Gas menu option and record the gas
stabilization period. Then use this length of time as your calibration gas
duration (we suggest that you also add a buffer to this length of time to be
certain that the gas has stabilized).
1. Select Cal Gas Duration from the Set Cal Timers menu option.
You will be prompted to enter the new span gas duration time:
O2 Span Time = xx:yy
Enter new time: Mn:Sc
2. Enter the new span gas duration time, then press the Enter key. If
performing an automatic verification, enter the verify gas time here.
Mn equals minutes and
Sc = seconds. As you type the new span gas
duration, it overwrites the Mn:Sc text. If you wish to use the currently
displayed time, press the
Enter key without entering a new value.
At this point you will be prompted to enter the Zero gas duration time:
O2 Zero Time = xx:yy
Enter new time: Mn:Sc
3. Enter the new zero gas duration, then press the Enter key. (If perform-
ing automatic verifications, this time value is ignored since only a
single gas is used.) Mn equals minutes and Sc = seconds. As you type
the new zero gas duration time, it overwrites the Mn:Sc text. If you
wish to use the currently displayed time, press the
Enter key without
entering any text.