This page is subject to proprietary rights statement on last page
1
06EN003368 Rev. G
ST75/ST75V MASS FLOW METER
Installation and Operation Guide
Pre-Installation
Serial Number Alignment
The ST75 and ST75V (Vortab) can be specified with integral or remote electronics. The flow element has a serial number etched
into the side of the HEX as shown on Figure A. In addition, the enclosure tag also shows serial and model numbers. The associated
transmitter circuit card has a serial number noted on the board as shown in Figure B. The flow sensor and transmitter circuit have been
calibrated as a matched set and should be paired together in service unless otherwise approved by a factory technician.
Flow Direction Alignment
All sensor elements have a flow arrow indicator marked on the element assembly at the reference HEX flat. These flow elements have
been calibrated in a particular direction and are designed to be used in service with the flow arrow going in the same direction as flow in
the pipe stream. The flow element has been calibrated directly in the pipe tee or tube tee with careful consideration for orientation and
insertion depth. Removal from the tee section while physically possible is not recommended unless authorized by a factory technician.
Figure C - Recommended Straight Run Condition
Recommended Straight Run
To optimize flow meter system performance, FCI recommends installation with a minimum of 20 diameters upstream straight run and 10 pipe
diameters of downstream straight run. Where straight run limitations significantly reduce the available pipe diameters, FCI uses flow conditioners
to produce a transferable flow profile from the calibration installation to actual field installations. FCI’s proprietary AVAL software is available
to make flow meter installation evaluations where straight run limitations are considered. See Figure C for recommended installation.
Figure A
Figure B
Flow Direction
Serial Number
FLOW
FLOW
247331
C00570-1
C00938-1
GND
EARTH
P3
ON
TB2
SIGNAL OUT
4-20mA
SINK
RTN
FCI
SOU
RCE
-
+
COM
F1
FC88/CLI
TB1
1.6A,
SB, UL)
(TR5,
18-36VDC POWER IN
247331
S/N
4-20mA
DIAMETER
AT LEAST 20 DIAMETERS
AFTER LAST FLOW DISTURBANCE
10 DIAMETERS
BEFORE NEXT
FLOW DISTURBANCE
OPTIMUM CONDITION
FLOW
C00568-3-1
