Figure 14 - St 700 Standard Transmitter - Operating Ranges; Figure 15 - St 700 Standard Transmitter - 3-Screw Terminal Board And Grounding Screw - Honeywell ST 700 User Manual

Figure 14 – ST 700 Standard Transmitter - Operating Ranges
Loop wiring is connected to the Transmitter by simply attaching the positive (+) and negative (–) loop
wires to the positive (+) and negative (–) terminals on the Transmitter terminal block in the
Electronics Housing shown in
Figure 15 – ST 700 Standard Transmitter - 3-Screw Terminal Board and Grounding Screw
As shown in Figure 15, 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. While it is not
necessary to ground the Transmitter for proper operation, 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 an area that is highly susceptible to lightning strikes.
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: The right hand terminal is for loop test and is not applicable for the Fieldbus option.
The Transmitter is designed to operate in a two-wire power/current loop with loop resistance and
Figure 14. With optional lightning protection and/or a remote meter, the voltage drop for these
options must be added to the basic 10.8-volt supply requirements to determine the required
Transmitter voltage (V
required when selecting intrinsic safety barriers to ensure that they will supply at least minimum
Revision 8.0
Figure 15.
power supply voltage within the operating range; see
) and maximum loop resistance (R
XMTR
ST 700 SmartLine Pressure Transmitters User's Manual
). Additional consideration is
LOOP MAX
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