Fluid Components International ST51 - Manual (Page 4)

FLUID COMPONENTS INTERNATIONAL LLC ST51 MASS FLOW
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To assist in final installation, FCI suggests making a readable mark on the extension pipe to indicate the final desired compression
fitting position that will place the element at the centerline reference once the system is tightened down into place. With the compres-
sion fitting lightly tightened , hold the element assembly along the outside of the installation, or directly above, to visually verify the
compression fitting location will ensure centerline installation. To calculate the actual “U” length dimension, take the inside diameter
of the pipe or duct divide by 2 , then add 0.25", then add for the pipe wall thickness and the process fitting offset that allows the
compression fitting to securely seat in the process port. See Figure D above.
Align the flat parellel to flow and adjust the instrument depth. Upon determination of the final compression fitting location on the
extension pipe, apply the proper thread sealant to the NPT threads, firmly tighten the compression fitting into the mating process
connection. Torque varies per application. Tighten the compression nut to the torque indicated with the corresponding ferrule
material. Manufacturer recommends 1-1/4 turns from hand tight baseline.
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 megaohm 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 megaohm 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 trouble shooting.
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.
See Safety instructions in Appendix A for the use of the ST51 series (AC and DC versions) in Hazardous Areas
Category II (Zone 1). Approval, KEMA 08ATEX0045/IECEx KEMA08.0012 for Category 2 GD protection Ex d IIC
T6..T1, Ex tD A21 IP67 T 90
° C ...Τ 121° C.
Ferrule Torque
Teflon 65 in – lbs
316 SST 65 ft – lbs
Input Power
The ST51 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 AC or DC power. Only connect the power specified on the wiring module as shown on Figures E and F respectively. Both
VAC and VDC inputs require a Gnd wire to be connected. Input power terminal blocks are rated for 14-26 AWG.
To wire the instrument, ensure that the power is off. 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 E and F. Note that when the 4-20mA outputs are used simultaneously, a single return lead is
used.
Analog Output
4-20mA: The instrument is provided with a standard set up, of two 4-20mA outputs. Output 1 configured for flow and Output 2
configured for temperature. Terminal blocks rated for 14-28 AWG., 500 ohm max load per output.