T3A Transmitter • 41
4. If “Yes” is selected to reset the zero and calibration values:
5. Press the ADD button to select “Yes” to confirm that you want to reset the Zero and
Calibration values and to return the device to normal operating mode. If you do not wish
to continue to reset the Zero and Calibration values, press the SUB button to select “No”
to leave the Product Settings and Configuration menu and to return the device to normal
operating mode.
6. Press and release the MENU button to move through the Product Settings and
Configuration menu or to exit to the normal operating mode screen.
NOTE:
If the T3A stored Zero and Calibration values are reset the device MUST be zeroed
and calibrated for proper and safe operation of the device.
Operation Settings
The Operation Settings menu allows you to:
•
change sensor alarm settings
NOTE:
After 5 minutes of no interaction with the device, the unit will automatically return to
normal operating mode.
The T3A continues monitoring for gas while in the Operation Settings menu.
Sensor Alarm Settings
The T3A has two alarm settings: Alarm 1 and Alarm 2. Regardless of whether the device
includes the optional two dry-contact relays, the system alarm settings are available on the
device. All alarm set-points are field adjustable up to 60% of the full scale gas concentration.
The factory default setting on the T3A for Alarm 1 is 10% of full scale and 15% of full scale
for Alarm 2. The Alarm 1 set-point should NEVER be programed to a higher setting than the
Alarm 2 set-point.
Both alarms are configurable to activate on either an increasing or decreasing level of gas. The
factory default setting is to activate when the detected gas increases above the alarm set-point.
When the gas concentration detected at the sensor meets or exceeds the Alarm 1 set-point, the
Alarm 1 indicator LED will illuminate amber. When the gas level meets or exceeds the Alarm
2 set-point, the Alarm 2 indicator LED will illuminate red. The alarm indicator LEDs will not
switch off until the gas level reading at the sensor has fallen 10% below the alarm set-points
or until the alarm is manually reset at the device, dependent upon the relay latching/auto reset
settings.