Fluid Components International LLC
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6 Doc. No. 06EN003367 Rev. E
ST50 Mass Flow Meter
Instrument Wiring
Before the instrument is opened to connect power and signal, FCI recommends that the following ESD precautions be observed:
Use a wrist band or heel strap with a 1 megohm resistor connected to ground. If the instrument is in the shop setting, there should be
a static conductive mat on the work table or floor 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 qualified personnel are to wire or test this instrument. The operator assumes all responsibility for safe
practices while wiring and troubleshooting.
FCI recommends installing and input power disconnect switch and fuse near the instrument to interrupt power during
installation and maintenance. Operator must have power disconnected before wiring.
Safety instructions for the use of the ST50 series (18 to 36 VDC version only) in Hazardous Areas. Approval, KEMA
06ATEX0207 X for Category 3 GD protection EEx nA T6 T65°. Special conditions for safe use:
1) Provision shall be made to prevent the rated voltage from being exceeded by transient disturbances of more than 40%.
2) For applications in explosive atmospheres caused by air/dust mixtures, cables and conduit entries shall be provided a
degree of protection of at least IP65 according to EN60529.
Input Power
The ST50 is available with both VDC and VAC input power configurations. 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 DC or AC power. Only connect the power specified on the wiring module as shown in Figures G and H. Both VAC and VDC
inputs require a Gnd wire to be connected. Input power terminal blocks accept 14-26 AWG wire.
Make sure 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 in Figures G and H. Note that when the 4-20 mA outputs are used simultaneously, a single return lead is used.
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