User’s Guide
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Flow Sensor with
Polypropylene Body
ISO 9001
CERTIFIED
ISO 9002
CERTIFIED
CORPORATE QUALITY
CORPORATE QUALITY
MANCHESTER, UK
STAMFORD, CT
Flow Sensor with Stainless Steel Body
FPR 200
Flow Sensor
Introduction
This manual is a service guide produced by the manufacturer. The
manual provides specific procedures and/or illustrations for installa-
tion, inspection, cleaning and filtration of all Omega FPR 200 flow
sensors. When properly followed, these procedures will keep your
flow sensor operating dependably for many years.
It is important for operators and maintenance personnel to be safety
conscience when operating or repairing equipment. Developing a thor-
ough knowledge of the precautionary areas and following safe operat-
ing procedures, can prevent equipment damage and/or personal injury.
Before making any repair, read all of the repair procedures to learn
the correct method and all precautions.
General
Omega’s flow sensors integrate rugged tangential turbine technology
with a precision digital to analog conversion circuit hermetically
encapsulated within the body of the sensor. The flow sensor is ideal
for measuring flow rates in cooling circuits, HVAC systems and batch-
ing operations.
Additional features are:
„ simple in-the-field serviceability of its moving components
„ the integral 4-20mA circuit design eliminates the need for separate
signal conditioning modules
„ units come factory calibrated to your system requirements
„ the low impedance 4-20mA circuit can transmit a "clean" signal
over low-cost wire for several thousand feet without degradation
„ accurately measures flow in both directions.
(3)
Illustration 1:
Mounting Instructions
Installation - Mechanical
1. The flow sensor has NPT (National Pipe Thread) plumbing con-
nections. It is recommended that a paste type pipe sealant be
used on these threads. [Teflon tape sealant can be used as long
as it is applied in such a way that it will not enter the flow stream.
Pieces of Teflon tape can wrap around the turbine and impede its
rotation.]
2. The recommended mounting orientation would be any plane that
will place the axis of the turbine horizontal with respect to the
ground. See Illustration 1. The unit will operate satisfactorily with
its axis at angles other than horizontal, but side loading of the
bearing surfaces will lead to premature wear of the rotating parts.
3. For the best flow measurement results, place the inlet (See Note 1)
of the flow sensor at least 10 straight pipe diameters down-
stream from any fitting, valve, elbow, reducer, etc. that causes
non-stable flow conditions. Ideally, 5 straight pipe diameters should
be placed at the outlet of the sensor. If the sensor must be placed
closer to a source of non-stable flow than these recommended dis-
tances, some instability of the output signal may result. The aver-
age signal will be accurate.
(4)
4. It is recommended that the sensor be placed in such a position
that the round access cover can be removed for cleaning and tur-
bine servicing. It is also recommended that a union be placed
near the sensor to allow easy removal.
Note1: The flow sensor is a bi-directional measuring device.
References to “inlet” and “outlet” refer to uni-directional systems.
Installation - Electronic (4-20mA Only)
The flow sensor circuit is a two-wire loop-powered design that transmits
a 4-20mA signal that is proportional to flow rate. The noise-immune cur-
rent transmission from the sensor can be routed with low cost two con-
ductor twisted-pair cable. The circuit operates on 12-35 VDC and
requires a source capable of supplying at least 20mA of current. The
circuit has built in polarity protection and over-current limiting to protect
both the transmitter and what the transmitter is connected to.
1. Connect the red wire (pin 1 for units with the electronic disconnect
option) from the transmitter sensor to the positive 12-35 VDC
power supply output.
2. Connect the black wire (pin 2 for units with the electronic disconnect
option) from the transmitter to the positive side of the loop load
(resistor, chart recorder, data acquisition board, meter, etc.). This
connection may be labeled "4-20mA Input" or "4-20mA (+)" on
some devices.
3. If applicable, connect the negative side of the loop load to negative
side of the power supply.
4. Apply power to the system.
5. If everything is operating correctly, the green LED on the sensor
will dimly illuminate and 4mA will be flowing in the loop. If there is
fluid flowing through the sensor, the current will be higher than
4mA and the LED will be quite bright.
If the LED does not illuminate:
„ check wiring terminations for good connections
„ check wiring polarity
„ verify correct supply voltage
„ ensure that the load impedance is within allowable limits
(5)
„ Apply the DC supply voltage directly across the sensor wires. If
the LED does illuminate, the load is either: too great of imped-
ance or an open circuit. If the LED does not illuminate, the sen-
sor's lead wires or circuit are defective.
6. The installation should be complete.
Installation - Electronic (0-5VDC Output Only)
1. Connect the red wire (pin 1 for units with the electronic disconnect
option) from the sensor to the positive terminal of the 12-35 VDC
power supply.
2. Connect the black wire from the transmitter (pin 2 for units with the
electronic disconnect option) to the negative terminal of the 12-35
VDC power supply.
3. Connect the green wire from the transmitter (pin 3 for units with
electronic disconnect) to the (+) 0-5 VDC input of the data acquisi-
tion device. This connection may be labeled "Voltage Input" or
"Analog Input" on some devices.
4. If applicable, connect the negative side of the power supply to the
negative side of the pulse input.
5. Apply power to the system.
6. If everything is operating correctly, the green LED will illuminate
brightly and the data acquisition device should show an increase in
flow rate as fluid starts flowing through the sensor.
If data acquisition device does not show an increase in flow rate:
„ check wiring terminations for good connections
„ verify that the LED is illuminated
„ verify that the DC supply voltage is between 12 and 35 VDC
(6)
Installation - Electronic (Pulse Output Only)
The flow sensor pulse output circuit is a three-wire DC-powered design
that transmits a frequency proportional to flow rate. The circuit operates on
5-24 VDC and will consume a maximum of 25 mA from the power supply.
1. Connect the red wire (pin 1 for units with the electronic disconnect
option) from the sensor to the positive terminal of the 5-24VDC
power supply.
2. Connect the black wire from the transmitter (pin 2 for units with the
electronic disconnect option) to the negative terminal of the 5-24
VDC power supply.
3. Connect the green wire from the transmitter (pin 3 for units with
electronic disconnect) to the (+) pulse input of the data acquisition
device. This connection may be labeled "Pulse In" or "DC Input"
on some devices.
4. If applicable, connect the negative side of the power supply to the
negative side of the pulse input.
5. Apply power to the system.
6. If everything is operating correctly, the data acquisition device should
begin "counting" pulses when fluid starts flowing through the sensor.
If the data acquisition device is not “counting”:
„ check wiring terminations for good connections
„ verify correct supply voltage and current
Flow Rate vs. Frequency Output
Flow Rate vs. Frequency Output
Standard 1/2" NPTF Units
Standard 3/4" & 1" NPTF Units
60
50
40
30
20
10
0
60
50
40
30
20
10
0
0
2
4
6
8
10
12
14
16
0
10
20
30
40
50
60
Flow Rate (GPM)
Flow Rate (GPM)
7. The installation should be complete. The relationship between the
frequency output and flow rate is shown in the graphs above.
(7)
Installation - Electronic (Relay Output Only)
1. Connect the red wire from the sensor to the positive terminal of the
12-35 VDC power supply.
2. Connect the black wire from the transmitter to the negative terminal
of the 12-35 VDC power supply.
3. (Versions with stainless steel sensor body only) Be sure to properly
ground the flow sensor by using the ground screw shown
in Illustration 2 to
GROUND SCREW
connect the sensor body
Earth ground. This step
may be unnecessary if
the piping system that the
flow sensor is plumbed
into is already connected
Illustration 2
to Earth ground.
4. Wire the appropriate relay contacts to the load that is to be
switched per Table 1 below.
5. If the unit is operating correctly, the green power indication LED
and the red relay status LED should illuminate after the DC supply
voltage is turned on. As fluid flow is increased above the factory-
adjusted set point, the red relay status LED should turn off.
If the LEDs do not illuminate when power is applied:
„ check wiring terminations for good connections
„ verify that the DC supply voltage is between 12 and 35 VDC
Table 1.: Wiring Connections
Wire Color
Connection
Red
+12-35 VDC
Black
DC Ground
Green
White
Relay Common
Relay Normally Closed Contact
Relay Normally Open Contact
Brown
(8)
Set Point Adjustment (Relay Output Only)
1) Adjust the flow rate through the line in which the flow sensor is
installed to the rate that corresponds to the desired relay trip point.
2) If the red LED on the back side of the sensor is not illuminated, use a
small flat bladed screwdriver to slowly turn the adjustment screw on the
set point potentiometer counter-clockwise until the red LED illuminates.
3) If the red LED is already illuminated, turn the adjustment screw on
the potentiometer clockwise until red LED turns off. Next, slowly
rotate the adjustment screw counter-clockwise until the red LED
illuminates.
4) Once the set point has been adjusted, the relay will operate as
shown in the Truth Table illustrated in Table 2 below.
Table 2.: Truth Table - Relay Operation
Relay NC
Contact
Relay NO
Contact
Condition
Red LED
Green LED
Illuminated
Illuminated
Flow rate<
set point
Open
Closed
Open
Closed
Open
Illuminated
Flow rate >
set point
Not
Illuminated
Not
Loss of power
to sensor
Not
Closed
Illuminated
Illuminated
Service and Maintenance
The sensor is designed to provide years of low maintenance service
in industrial environments. As with all mechanical rotating devices, the
bearing surfaces will wear with use. The life of the parts will depend
on factors such as cleanliness of the fluid, media, mounting orienta-
tion, temperature, fluid velocity and frequency of operation. The flow
sensor was designed with simple field-replacement of the rotating
parts in mind. To inspect or replace the rotating components:
(9)
1. Relieve pressure in the piping system.
2. Remove the retainer ring that secures the turbine access cover.
3. Remove the access cover with a pliers, taking care not to damage
the o-ring seal.
4. Pull out the turbine assembly and the shaft.
5. Inspect the shaft for things that may have wrapped around it.
6. Inspect the turbine bearing surface for wear and elongation.
Replace as necessary.
7. Clean any rust off of the magnets that may have accumulated.
8. Reassemble the unit by placing the turbine into the body cavity
with the two magnet pockets facing inward. Place the shaft into the
turbine hole and guide it into the retaining hole in the body cavity.
Lubricate the o-ring seal with some glycerin or other lubricant and
press it into the pocket of the body. Replace the retaining ring
securely before applying pressure to the system.
Circuit recalibration (4-20mA version):
1. Place a milliamp meter into the current loop.
2. Turn off the flow going though the sensor. Adjust the OFFSET
control for a reading of 4mA on the milliamp meter.
3. Adjust the flow rate though the meter to full flow rate. Adjust the
SPAN control for a reading of 20mA on the milliamp meter. The
two controls are not interactive, so further adjustment should not
be necessary.
Circuit recalibration (0-5VDC version):
1. Place a voltmeter across the black & green wires of the sensor pigtail.
2. Turn off the flow going though the sensor. Verify a reading of less
than 50 mVDC on the voltmeter.
3. Adjust the flow rate though the meter to full-scale flow rate. Adjust
the SPAN control for a reading of 20mA on the milliamp meter.
The two controls are not interactive, so further adjustment should
not be necessary.
(10)
Mechanical Specifications
FLOW SENSOR WITH STAINLESS STEEL BODY
Maximum pressure:
200 PSI clear cover, 500 PSI SS cover
º
Maximum temperature: 225 F
Measuring range*
1/2" NPT Ported:
0.5 - 15 GPM
3/4" & 1" NPT Ported: 1.5 - 50 GPM
Wetted materials:
316SS, acetal copolymer, Buna, PEEK
and polycarbonate
Non-wetted materials: Epoxy, Lexan® and PVC
FLOW SENSOR WITH POLYPROPYLENE BODY
Maximum pressure:
150 PSI
º
Maximum temperature: 150 F
Measuring range*
1/2" NPT Ported::
0.5 - 15 GPM
Wetted materials:
316SS, acetal copolymer, Buna, PEEK,
polycarbonate and polypropylene
Non-wetted materials: Epoxy, Lexan® and PVC
*Important: Chose a maximum flow rate. For 1/2": 5 - 15 maximum GPM.
For 3/4" and 1": 15 - 50 maximum GPM. Minimum flow rate will
be 10% of maximum flow rate. Example: If your maximum flow
rate is 8 GPM, the minimum flow rate would be .8 (8 x .1 = .8).
Thus, the correct flow range would be .8 - 8.0 GPM.
Electronic Specifications
ALL VERSIONS WITH 4-20 MA CIRCUIT
Power requirements:
12-35VDC, 20mA
Load driving capacity:
Max. Load (Ω) = 50(Power Supply Voltage - 12)
Trans. Distance:
LED:
limited only by wire resistance & supply voltage
provides power indication
±2% of full scale
Flow rate accuracy:
Repeatability:
Resolution:
±0.5% of scale
infinite
Response time:
2 seconds to 90%
Over-current protection: self limiting at 30mA
Fail safe indication: 4 mA
(11)
ALL VERSIONS WITH 0-5 VDC CIRCUIT
Power requirements:
Maximum Current:
Max. Trans. Distance:
Min. Load Resistance:
Flow rate accuracy:
Repeatability:
12-35VDC, 20 mA
30 mA DC
<200 feet recommended
1000 Ω
2% of full scale
0.5% of scale
infinite
Resolution:
Response time:
2 seconds to 90%
ALL VERSIONS WITH PULSE OUTPUT CIRCUIT
Power requirements:
Maximum Current:
Max. Trans. Distance:
Flow rate accuracy:
Linearity:
5-24VDC, 20 mA
25 mA DC
<200 feet recommended
2% of full scale
0.5% of scale
Infinite
Resolution:
Response time:
< 100 mS
ALL VERSIONS WITH RELAY OUTPUT CIRCUIT
Power Requirements
Max. Trans. Distance
Switch Contact
12-35 VDC
< 200 feet recommended
Form C, 5A max @120 or 240 VAC
5% of reading max.
Hysteresis
(12)
Dimension Drawings
DIM
A
1/2" NPTF Ports
3/4" & 1" NPTF Ports
3.06" (78 mm)
1.33" (34 mm)
2.46" (62 mm)
2.78" (71 mm)
2.88" (73 mm)
5.25" (133 mm)
3.80" (97 mm)
n/a
1.94" (49 mm)
1.13" (29 mm)
2.00" (51 mm)
2.45" (62 mm)
2.60" (66 mm)
3.70" (94 mm)
2.63" (67 mm)
3.38" (86 mm)
B
C
D
D1
E
F
F2
1Dimension with optional clear cover installed
2Polypropylene version only
(13)
NOTES:
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(14)
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 vibra-
tion; 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 pur-
chaser 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 WARRANTY RETURNS, please have
the following information available BEFORE
contacting OMEGA:
1. Purchase Order number under which
the product was PURCHASED,
2. Model and serial number of the product
under warranty, and
3. Repair instructions and/or specific
problems relative to the product.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover the
COST of the repair,
2. Model and serial number of the
product, and
3. Repair instructions and/or specific problems
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 registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2005 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.
Where Do I Find Everything I Need for
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OMEGA…Of Course!
Shop online at omega.com
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