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TMO2D Digital Display User’s Manual 45
Chapter 4. Basic Programming
4.8.5c Set AutoCal Mode?
Most transmitters will have the best accuracy with a two-point zero and span calibration. Transmitters such as the
O2X1 oxygen transmitter have a fixed zero point, so only a one-gas span (slope) calibration is required.
Set AutoCal
Mode? enables you to determine whether the display calibrates for both zero and span gases (two points) or simply for
one gas, either on offset or span (slope). To enter this option:
:
If you select 1 gas cal, the following prompt appears:
4.8.5d Set Cal Gas Data?
In the “Set Cal Gas Data?” option, you can program the zero, span or offset gases. If you select the “2 gas cal” mode,
the prompts ask for zero and span gas data. But if you select the “1 gas cal” mode, the prompt asks for data for either
the offset or span gas, depending on the mode selected in the
Set AutoCal Mode? on page 45.
For an oxygen transmitter, if 100% nitrogen is used for the zero gas, the concentration would be zero. If a mixture is
used, you should enter the oxygen concentration of the mixture. The default concentration is 0% oxygen.
After you enter the gas concentration, the display will automatically prompt for the equilibration time for the zero gas.
The equilibration time should allow for the distance the calibration gas must travel, and for the settling time of the
transmitter cell.
Note:
For a successful auto calibration, the equilibration time should be at least 3 minutes.The default is 5 minutes.
For testing purposes, the equilibration time can be as low as 0 seconds. The maximum equilibration time is 90
minutes.
For example, to set the zero gas in a 2-gas cal mode for 0.00% oxygen for an equilibration time of 3 minutes:
AUTO CALIBRATION MENU
Set AutoCal Mode
?
Scroll through the submenu, and press [YES] to enter the AutoCal Mode option.
Set AutoCal Type:
[1 GAS CAL] 2 gas cal
Use the [NO] or arrow keys to scroll to the desired selection, then press [YES].
Set 1Gas Auto Cal Type
[OFFSET-CAL] span-cal Use the [NO] or arrow keys to scroll to the desired selection, then press [YES].
AUTO CALIBRATION MENU
Set AutoCal Mode Press [NO] to proceed to the “Set Cal Gas Data?” option.
AUTO CALIBRATION MENU
Set Zero Gas?
Scroll through the submenu, and press [YES] to enter the Set Zero Gas option.