T3A Transmitter • 15
Wiring Power and 4-20 mA Output
The T3A has several basic wiring configurations, dependent upon the desired usage and
functionality intended by the end-user. All T3A units r12 to +35 Volts of wired DC
power to operate. Data communication from the device, through either the 4-20 output or the
RS-485 Modbus connection, to an external location are optional.
CAUTION:
The internal components can be static sensitive. Use caution when opening the
enclosure and handling internal components.
CAUTION:
Make sure the power source is off before beginning the wiring procedure.
CAUTION: DO NOT
use any metal objects or tools to remove the terminal board from the
internal system.
1. Unscrew the enclosure lid and set it aside.
2. Grab the thumbscrews and gently lift the internal system out of the enclosure. It can rest
on the edge of the enclosure.
NOTE:
Disconnecting the sensor connector plug from the sensor housing will allow for the
complete removal of the internal system from the device enclosure. Disconnecting the
internal system may provide ease in accessing the control board terminals for wiring.
Reconnect the sensor connector plug before reinstalling the internal system.
WARNING: Use appropriate construction technique to maintain the explosion proof
classification of the assembly.
Table 2: T3A Terminal Block Wire Gauges
Terminal Block
Wire Gauge
Power terminal
Min: 26 AWG
Max: 14 AWG
Relay 1 & 2 terminal
Modbus terminal
Min: 26 AWG
Max: 16 AWG
Fault terminal