FCI ST75 - Input Power and Wiring; Output Configuration; Analog and Pulse Output Setup

Fluid Components International LLC ST75/ST75V Mass Flow Meter
This page is subject to proprietary rights statement on last page 4 06EN003368 Rev. G
Instrument Wiring
Before opening the instrument to connect power and signal observe the following ESD precautions:
Use a wrist band or heel strap with a 1 megohm resistor connected to ground. If the instrument is in the shop setting, use a static
conductive mat on the work table or oor with a 1 megohm resistor connected to ground. Connect the instrument to ground. Apply
antistatic agents such as Static Free made by Chemtronics (or equivalent) to hand tools to be used on the instrument. Keep high static
producing items away from the instrument.
The above precautions are minimum requirements. The complete use of ESD precautions can be found in the U.S. Dept. of Defense
Handbook 263.
Warning: Only qualied personnel are to wire or test this instrument. The operator assumes all responsibility for safe
practices while wiring and trouble shooting.
Install an input power disconnect switch and fuse near the instrument to interrupt power during installation and maintenance.
Operator must have power disconnected before wiring.
See the “Specic Conditions of Use” and “Safety Instructions” sections in Appendix A for use of the ST75/ST75V (AC and
DC versions) in Hazardous Areas Category II (Zone 1).
Input Power
The ST75/ST75V is available with both VDC and VAC input power congurations. Customers selecting VDC input power will have a
VDC input board only. Similarly, the VAC power board is supplied only with VAC powered units. In addition, both boards are marked
for either AC or DC power. Only connect the power specied on the wiring module as shown on Figures D and E respectively. Both
VAC and VDC inputs require a Gnd wire to be connected. Input power terminal blocks accept 14-26 AWG wire.
Make sure that power is OFF before wiring the instrument. Pull the power and signal output wires through the port, using care not to
damage wires. FCI recommends using crimp lugs on the output wires to ensure proper connection with the terminal strip. Connect the
output wires as shown on Figures D and E. Note that when the 4-20 mA outputs are used simultaneously, a single return lead is used.
Analog Output
4-20 mA: The instrument is provided with two 4-20 mA outputs. By default Output 1 is congured for ow and Output 2 is congured
for temperature. Terminal blocks accept 14-28 AWG wire, 500 ohms max load per output.