Omega Products FMA901A-V1-S Installation Manual

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FMA900A SERIES

Air Velocity Transmitter With One

SPST Relay Contact Closure

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User’s Guide

Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford, CT 06907-0047 USA

Toll Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Canada: 976 Bergar

Laval (Quebec), H7L 5A1 Canada
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378/1-800-622-BEST

®

Engineering Service: 1-800-872-9436/1-800-USA-WHEN

®

Mexico/ En Español: 001 [phone] FAX: [phone]
Latin America: [e-mail] e-mail: [e-mail]

Servicing Europe:

Benelux: Managed by the United Kingdom Office

Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Czech Republic: Frystatska 184

733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

France: Managed by the United Kingdom Office

Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Germany/Austria: Daimlerstrasse 26

D-75392 Deckenpfronn, Germany
Toll-Free: 0800 6397678 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified One Omega Drive, River Bend Technology Centre, Northbank

Irlam, Manchester M44 5BD United Kingdom
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

OMEGAnet®Online Service Internet e-mail

omega.com [e-mail]

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

i

FMA900A SERIES

Air Velocity Transmitter With One SPST Relay Contact Closure

Table of Contents

Section Page

Section 1 - Introduction ....................................................................................... 1-1

Section 2 - Installation ......................................................................................... 2-1

Section 3 - Operations ......................................................................................... 3-1

Maintenance ..................................................................................................... 3-1

Calibration ........................................................................................................ 3-1

Section 4 - Specifications ................................................................................... 4-1

ii

FMA900A SERIES
Air Velocity Transmitter With One SPST Relay Contact Closure

List of Figures

Figure Description Page

Table 1 Piping Requirements .......................................................................... 2-2

2-1 FMA900A Back Plate View ............................................................... 2-3

2-2 Typical Wiring Diagram .................................................................... 2-3

2-3 FMA900A Fixed Mount Probe, General Dimensions .................... 2-4

2-4 FMA900A With Remote Probe ......................................................... 2-4

Section 1 - Introduction

The FMA900A series measures air velocities up to 12,000 FPM (60.9 m/sec). It
provides either a 0 to 5 Vdc or 4/20 mA analog output corresponding to the air
flow range and one SPST relay contact closure corresponding to high alarm set
point. The alarm set point is adjustable from 0 to 100% of the air flow range. This
unit can be used in HVAC applications, R&D labs, exhaust/ ventilation hoods
and other manufacturing processes.

The sensor is designed based on RTD elements. The air velocity is measured by
the heat loss from the RTD sensor as it cools down by the air flow. The sensor is
housed in a 1/4" OD x 12" long 304 Stainless Steel tube with inch marks for ease
of insertion depths. The sensor probe comes in three configurations:

• Fixed mount probe

• 12" long remote probe connected via 15 feet of shielded cable

• 3.75" Short Probe

The following table shows all the models of this product.

Model No. Range FPM (m/sec) Description

FMA901A-*-** 0 to 500 (0 to 2.54) Air velocity transmitter, relay output, fixed probe

FMA901R-*-** 0 to 500 (0 to 2.54) Air velocity transmitter, relay output, remote probe

FMA902A-*-** 0 to 1000 (0 to 5.08) Air velocity transmitter, relay output, fixed probe

FMA902R-*-** 0 to 1000 (0 to 5.08) Air velocity transmitter, relay output, remote probe

FMA903A-*-** 0 to 2000 (0 to 10.16) Air velocity transmitter, relay output, fixed probe

FMA903R-*-** 0 to 2000 (0 to 10.16) Air velocity transmitter, relay output, remote probe

FMA904A-*-** 0 to 5000 (0 to 25.4) Air velocity transmitter, relay output, fixed probe

FMA904R-*-** 0 to 5000 (0 to 25.4) Air velocity transmitter, relay output, remote probe

FMA905A-*-** 0 to 10,000 (0 to 50.8) Air velocity transmitter, relay output, fixed probe

FMA905R-*-** 0 to 10,000 (0 to 50.8) Air velocity transmitter, relay output, remote probe

FMA906A-*-** 0 to 12,000 (0 to 60.9) Air velocity transmitter, relay output, fixed probe

FMA906R-*-** 0 to 12,000 (0 to 60.9) Air velocity transmitter, relay output, remote probe

Where,
*- Specify output type, add suffix “V1” for 0 to 5 Vdc, “MA” for 4 to 20 mA
**- Add suffix “S” for 95mm (3.75”) short probe

1-1

Introduction

1