FCI ST51 User Manual (English)

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Pre-Installation

The ST51 can be specified with integral or remote electronics. The flow element has a serial number etched into the side of the

extension pipe as shown on figure A. The 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 flat. These flow elements have

been calibrated in a particular direction and are designed to be used in service with the flow arrow facing in the same direction as

flow in the pipe stream. See Appendix C for orientation and factory calibration details.

ST51 MASS FLOW METER

Installation and Operation Guide

Recommended Straight Run

To optimize flow meter system performance, FCI recommends installation with a minimum of 20 pipe diameters upstream straight run

and 10 pipe diameters of downstream straight run. Where straight run limitations significantly reduce the available pipe diameters, FCI

utilizes Vortab 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 Fig C for recommended installation.

FCI Flow Meters may be installed with less than the recommended straight run, but may have performance limitations. FCI offers

Vortab flow conditioners for use in applications that have significant straight run limitations. FCI uses the AVAL application model-

ing software to predict meter performance in each installation. AVAL outputs are available to review prior to order placement and

will indicate performance expectations both with and without Vortab Flow Conditioning.

Figure C

Figure A

Figure B

Flow Direction

Serial Number

FLOW

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FCI ST51 Specifications

General

Manufacturer	Fluid Components International (FCI)
Type	Thermal Mass Flow Meter
Repeatability	±0.5% of reading
Enclosure	NEMA 4X (IP66)
Insertion Type	Insertion
Response Time	1 second
Application	Air, Compressed Air, Nitrogen, Natural Gas, Biogas, Mixed Gases
Media	Gases
Temperature Range	-40°C to 260°C (-40°F to 500°F)
Pressure Range	Up to 500 psig (34 bar)
Accuracy	±1% of reading
Flow Range	0.076 to 122 NMPS (0.25 to 400 SFPS)
Output	4-20 mA, HART
Approvals	ATEX, IECEx
Measurement Range	0.076 to 122 NMPS (0.25 to 400 SFPS)
Operating Temperature	-40 to 85°C (-40 to 185°F)
Operating Humidity	0 to 95% RH (non-condensing)
Dimensions	Varies depending on probe length and enclosure type. Consult datasheet.
Weight	Varies depending on probe length and enclosure type. Consult datasheet.