T2A Transmitter • 27
2. Press and release the MENU button until the Cal Method screen appears.
3. Use the ADD button to select manual calibration and the SUB button to select auto
calibration.
4. Use the MENU button to scroll through the rest of the Product Settings and Configuration
menu and return to Normal Operating Mode.
4-20 mA Offset Settings
Setting the 4-20 mA offset allows the end-user to calibrate the sensor’s analog output. Upon
installation of the device, if the detected gas reading on T2A does not correspond to the
reading on the controller, the zero offset (4 mA) and the full-scale offset (20 mA) can be
adjusted on the unit.
Over time, as electronic components suffer from normal wear and tear, the circuits will tend to
drift. This drift can cause variances in the amount of current output by the sensor, or in the
current measurement by the controller. If at any time the reading on the T2A no longer
matches the reading on the controller, the 4-20 mA offset will need to be recalibrated.
The factory default settings on the T2A for the 4-20 mA offset are 4.00 mA for the zero offset
and 20.00 mA for the full-scale offset.
1. If necessary, enter the Product Settings and Configuration menu by pressing and holding
the MENU button for 6 seconds.
2. Press and release the MENU button until the 4-20 mA Offset screen appears.
3. Press and release the ADD button to set the 4-20 mA offset and advance to the zero offset
setting screen. If you do not wish to set the 4-20 mA offset, press and release the SUB or
MENU button to advance to the display screen contrast setting screen.
www.
GlobalTestSupply
.com
Find Quality Products Online at:
