Omega | FMA900A Series | Owner Manual | Omega FMA900A Series Owner Manual

Omega FMA900A Series Owner Manual
TM
User’s Guide
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FMA900A SERIES
Air Velocity Transmitter With One
SPST Relay Contact Closure
omega.com info@omega.com
U.S.A.
Headquarters:
Servicing North America:
Omega Engineering, Inc.
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: (203) 359-1660
Fax: (203) 359-7700
e-mail: info@omega.com
For Other Locations Visit omega.com/worldwide
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.
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
i
FMA900A SERIES
Air Velocity Transmitter With One SPST Relay Contact Closure
List of Figures
ii
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
Introduction
1
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
1
Introduction
NOTE:
The FMA900A air velocity transmitter is not explosion
proof, nor is it intrinsically safe. Do not use for flammable or
hazardous gases, or in Hazardous areas.
The FMA900A series air velocity switch is intended for use with clean air or
Nitrogen ONLY. Do not use with other gases, as it will produce an error in
measurement. In addition, air carrying dust or oil (such as found in blower/
compressor systems that utilize oil) can lead to coating of the sensor and thus
inaccurate readings.
Refer to the Maintenance section for information on cleaning the sensor. The
FMA900A is a bi-directional device, meaning the air flow in the forward or
reverse direction provides the same readings. The FMA900A can be mounted
vertically or horizontally without shift in calibration.
1-2
Installation
2
Section 2 - Installation
1. Remove the protective cap from the sensor tip.
2. Run a length of straight pipe before and after the flow sensor probe.
The amount of upstream straight pipe required depends on the type of
obstruction which is immediately upstream of the flow sensor. See Table 1
for specific requirements. Downstream of the flow sensor, in all situations,
run 5 diameters of straight pipe regardless of the downstream obstruction.
3. Align the sensor probe with the air flow. Make sure the air flow is
perpendicular to the sensor window. The score line on the sensor tubing
is another way of aligning the sensor to the flow stream. The score line
starts from the center of the sensor window and as a result it can be aligned
properly.
4. One way of installing the sensor probe into a flow stream is to utilize a
compression fitting such as Omega’s SSLK-14-14 stainless steel compression
fitting with PTFE ferrule, which allows adjustment of the insertion depth of
the probe.
5. Connect your wirings to the terminal block in the back of the unit. Figure
1 shows the back plate. The back plate has the terminal block for wiring
connections, and one potentiometer adjustment for high alarm set point.
It also has one red LED alarm indication, and the green LED for power
indication. Figure 2 shows a typical wiring diagram.
2-1
2
Installation
Recommended
Straight Pipe
Length "A"
Typical Piping
Without
Vanes
With
Vanes
15D
15D
Closed Branch
20D
15D
Elbow. Tee,
Branch Pipe
25D
15D
Elbow, 2 planes
25D
15D
Long-radius
bends
A
30D
25D
15D
15D
Elbow
Long-radius
bends
A
40D
35D
15D
15D
Elbow
Long-radius
bends
20D
15D
Contracting Pipe
40D
20D
Expanding Pipe
A
Varied Section
Fittings in Two Planes
All Fittings in Same Plane
A
A
A
A
A
A
Valves
Remarks
A
Recommend Meter
Be Installed
Upstream
Regulating,
reducing valves
Ball, check valves
Shut-off valves
Note: Straight pipe length on the downstram side to be 5 pipe diameters minimum.
Note: D – Pipe internal diameter
.
Table 1. Piping Requirements
2-2
Installation
2
8 7 6 5 4 3 2 1
HAL
ADJ
HI ALARM
HIGH ALARM
RED LED
HIGH ALARM
ADJUST
POWER
Figure 2-1. FMA900A Back Plate View
8
7
+
+PWR
15-24 VDC
POWER SUPPLY
-PWR
V
6
5
–
I
ANALOG OUTPUT
0/5 Vdc
HIGH ALARM SET
+
4/20mA
DVM
–
Fuse
4
HIGH ALARM CONTACT
CLOSURE. NORMALLY OPEN
LOAD
3
2
NC
1
NC
Figure 2-2. Typical Wiring Diagram
2-3
2
Installation
Figure 2-3 shows the FMA900A general dimensions with the fixed mount
probe. Figure 2-4 shows the FMA900A with remote probe.
97.8
(3.85)
DIMENSIONS mm (in)
31.8
(1.25)
SCORE LINE FOR
FLOW ALIGNMENT
304.8
(12.0)
88.9
(3.50)
FIXED PROBE MOUNT
8
HIGH ALARM SET
NC
TM
1
HAL
ADJUST
NC
RELAY CONTACT
10A @ 24Vdc
HIGH ALARM
POWER
HI ALARM
OUTPUT
AIR FLOW TO BE
PERPENDICULAR TO THE
SENSOR WINDOW
FMA900A SERIES
AIR VELOCITY
TRANSMITTER
!!
50.8
(2.0)
+PWR 15-24V
200 mA
–PWR
AIR VELOCITY
SENSOR
1/4" OD 304 STAINLESS STEEL TUBING
WITH INCH MARKING
Figure 2-3. FMA900A Fixed Mount Probe, General Dimensions
4.57 meters (15 feet)
OF SHIELDED
FLEXIBLE CABLE
30.5 cm (12 inches)
TM
8
!!
HI ALARM
NC
RELAY CONTACT
10A @ 24Vdc
HIGH ALARM
NC
HIGH ALARM SET
OUTPUT
+PWR 15-24V
200 mA
–PWR
FMA900A SERIES
AIR VELOCITY
TRANSMITTER
1
HAL
ADJUST
POWER
Figure 2-4. FMA900A With Remote Probe
2-4
AIR
FLOW
Operations
Section 3 - Operations
3
CAUTION:
Connection to the power supply, analog output, and the
relay output should be made by qualified personnel only.
When the relay connection is made to voltages greater than
40 Vac, extreme care must be taken to avoid injury, and the
transmitter should be operated in an enclosure as provided
by your local BOCA code. The relay load should be resistive
(eg. Not a torque motor).
The FMA900A measures the air velocity and provides either a 0 to 5 Vdc
or 4 to 20 mA analog output. It has a built-in SPST NO relay for high alarm
operation. Here is the procedure to operate this unit:
• After completing the wiring connections, use a regulated DC power supply
(15 to 24 Vdc) to power the device.
• Measure the high alarm set point voltage using a DVM (Digital Volt-meter).
This voltage is measured from terminal block # 5 to # 7. The air flow range
is based on 0 to 5 Vdc. For example, if you have a 0 to 5000 FPM range
unit, and want to adjust the high alarm set point to 3500 FPM, you will
adjust the high alarm potentiometer on the back plate (HAL ADJ) so that
the DVM measures 3.5 volts.
• Now you are ready to operate the unit. The analog output is measured
between terminal block # 6 & # 7. When the air flow goes above 3500
FPM, the relay will energize and will provide a contact closure. The red
LED alarm indicator will also turn on.
Maintenance
Except for intermittent removal of the sensor from the line for cleaning, there
is no routine maintenance. If the sensor probe becomes coated with dust, blow
the dust away with clean air. If the sensor probe is coated with sticky material,
clean it with water or alcohol (Ethanol) using an artist’s brush.
Calibration
Each FMA900A is individually calibrated in a NIST traceable wind tunnel. For
calibration certification or calibrating to a new air flow range, the unit must be
returned back to the factory.
3-1
4
Specifications
Section 4 - Specifications
Air Velocity Range:0 to 500 (0 to 2.54), 0 to 1000 (0 to 5.08), 0 to 2000 (0
to 10.16), 0 to 5000 (0 to 25.4), 0 to 10,000 (0 to 50.8),
0 to 12,000 (0 to 60.9) FPM (m/sec)
Accuracy:
Sensor Probe
Standard:
Steel
Remote:
-S (Short Probe):
Steel
2% of Full Scale
6.3 OD x 305 mm (1⁄4 OD x 12") – 304 Stainless
Standard probe connected via 15' of shielded cable
6.3 OD x 95 mm (1⁄4 OD x 3.75") – 304 Stainless
Velocity Sensor:
One 100 ohms RTD, Two 1000 ohms RTD
Response Time:
250 msec, 0 to 90% of final value
Analog Output
Voltage:
Current:
0 to 5 Vdc, 1K min. Load
4 to 20 mA, 400 Ohms Load Max.
High Alarm Set Point:
0 to 100% adjustable, 0 to 5 Vdc
Alarm Indication:
Red LED
Alarm Deadband:
5% of FS
Built-in Relay:
One 12V SPST NO relays
Contact Rating:
10A @ 24 Vdc, 10A @ 250 Vac (Resistive)
Operating Ambient Temperature
Sensor Probe:
-40 to 93ºC (-40 to 199ºF)
Electronic Case:
0 to 50ºC (32 to 122ºF)
4-1
Power:
15 to 24 Vdc @ 200 mA
Power Indicator:
Green LED
Dimensions:
89 H x 51 W x 32 mm D (3.5 x 2 x 1.25")
Weight:
160 g (5.6 oz)
FMA900A Series
NOTES:
4-2
FMA900A Series
NOTES:
4-3
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace
period to the normal one (1) year product warranty to cover handling and shipping time. This ensures
that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for
any damages that result from the use of its products in accordance with information provided
by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)
NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any
correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
FOR NON-WARRANTY REPAIRS, consult
FOR WARRANTY RETURNS, please have the
OMEGA for current repair charges. Have
following information available BEFORE contacting
the following information available BEFORE
OMEGA:
contacting OMEGA:
1.Purchase Order number under which the product
1. Purchase Order number to cover the COST
was PURCHASED,
of the repair,
2.Model and serial number of the product under
2. Model and serial number of the product, and
warranty, and
3. Repair instructions and/or specific problems
3. Repair instructions and/or specific problems
relative to the product.
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our
customers the latest in technology and engineering.
OMEGA is a trademark of OMEGA ENGINEERING, INC.
© Copyright 2018 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior
written consent of OMEGA ENGINEERING, INC.
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