FCI ST75 User Manual (English)

To Next Page

This page is subject to proprietary rights statement on last page

06EN003368 Rev. G

ST75/ST75V MASS FLOW METER

Installation and Operation Guide

Pre-Installation

Serial Number Alignment

The ST75 and ST75V (Vortab) can be specied with integral or remote electronics. The ow 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 ow 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 ow arrow indicator marked on the element assembly at the reference HEX at. These ow elements have

been calibrated in a particular direction and are designed to be used in service with the ow arrow going in the same direction as ow in

the pipe stream. The ow 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 ow 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 signicantly reduce the available pipe diameters, FCI uses ow conditioners

to produce a transferable ow prole from the calibration installation to actual eld installations. FCI’s proprietary AVAL software is available

to make ow meter installation evaluations where straight run limitations are considered. See Figure C for recommended installation.

Figure A

Figure B

Flow Direction

Serial Number

FLOW

247331

C00570-1

C00938-1

GND

EARTH

TB2

SIGNAL OUT

4-20mA

SINK

RTN

FCI

SOURCE

COM

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

Need help?

Do you have a question about the FCI ST75 and is the answer not in the manual?

FCI ST75 Specifications

General

Manufacturer	Fluid Components International (FCI)
Type	Thermal Mass Flow Meter
Media	Gases
Accuracy	±1% of reading +0.5% of full scale
Repeatability	±0.5% of reading
Enclosure	NEMA 4X (IP66)
Resolution	0.1% of full scale
Display	Optional LCD
Output	4-20 mA, HART
Power	24 VDC
Approvals	FM, CSA, ATEX, IECEx
Insertion Type	Insertion
Storage Temperature	-40°C to +85°C (-40°F to +185°F)
Weight	Varies with configuration
Application	Air and Gas Flow Measurement