28 • T2A Transmitter
Zero Offset Setting
If “Yes” is selected to set the 4-20 mA offset:
1. Use the ADD and SUB buttons to increase and decrease the zero offset on the unit,
respectively, until the controller reads 0 %/ppm, depending on the gas type being detected.
2. Press the MENU button to save the desired setting and to advance to the full-scale offset
setting screen.
Full-Scale Offset Setting
NOTE:
Adjusting the full-scale offset will initiate alarm conditions. Disable the alarms or
make sure all personnel are aware that any alarms are false.
1. Use the ADD and SUB buttons to increase and decrease the full-scale offset, respectively,
until the controller reads the full scale value for that channel.
2. Press the MENU button to save the desired setting and to advance to the display screen
contrast setting screen.
Display Screen Contrast Setting
The display screen contrast is the difference in luminance or color that makes the displayed
images distinguishable. Due to varying external elements, such as extreme sunlight, the
brightness of the display screen may need to be adjusted for optimum viewing.
The factory default setting on the T2A for the display screen contrast is 29, approximately
45% of the contrast scale. The contrast setting ranges from 1 to 64.
NOTE:
Setting the contrast too low will cause the display image to become faint or
indistinguishable, especially when the unit is located in areas with full-sun. The
resulting field of view could be misinterpreted as an error within the device. Be sure
to verify that the selected contract is within an appropriate range of viewing.
1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.
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