SmartLine Temperature Transmitter
10
Quick Start Installation Guide
Figure 8 - Transmitter 9-Screw Terminal Board and Grounding Screw
As shown in
Figure 8
, each transmitter has an internal terminal to connect it to earth
ground. Optionally, a ground terminal can be added to the outside of the Electronics
Housing. Grounding the transmitter for proper operation is required, as doing so
tends to minimize the possible effects of noise on the output signal and affords
protection against lightning and static discharge.
An optional lightning terminal block can be installed in place of the non-lightning
terminal block for transmitters that will be installed in areas that are highly
susceptible to lightning strikes. As noted above, the Loop Power wiring shield should
only be connected to earth ground at the power supply end.
Note: Terminal pin 9 is not used.
Wiring must comply with local codes, regulations and ordinances.
Grounding may be required to meet various approval body certification,
for example CE conformity. Refer to Appendix A of this document for details.
Note:
Terminal #3 is for loop test
The Transmitter is designed to operate in a two-wire power/current loop with loop
resistance and power supply voltage within the operating range; se
With an optional remote meter, the voltage drop for this must be added to the basic
power supply voltage requirements to determine the required Transmitter voltage
and maximum loop resistance. Additional consideration is required when selecting
intrinsic safety barriers to ensure that they will supply at least minimum Transmitter
voltage, including the required 250 ohms of resistance (typically within the barriers)
needed for digital communications. See
Figure 7.
