Omega Products FPR 200 Installation Manual

FPR 200

Flow Sensor

Flow Sensor with Stainless Steel Body

Flow Sensor with
Polypropylene Body

User’s Guide

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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.

Introduction

This manual is a service guide produced by the manufacturer. The
manual provides specific procedures and/or illustrations for installa­tion, 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 thor­ough knowledge of the precautionary areas and following safe operat­ing 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 batch­ing 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.

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Installation - Mechanical

1. The flow sensor has NPT (National Pipe Thread) plumbing con­nections. 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 down­stream 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 dis­tances, some instability of the output signal may result. The aver­age signal will be accurate.

(4)

Illustration 1:

Mounting Instructions

4. It is recommended that the sensor be placed in such a position
that the round access cover can be removed for cleaning and tur­bine 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 cur­rent transmission from the sensor can be routed with low cost two con­ductor 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

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