Omega Products FDT-30 Installation Manual
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TABLE OF CONTENTS
Quick Start Instructions 4
Introduction 6
Specifications 7
Symbol Explanations 7
Components and Terminology 8
Flow Meter Mounting Procedure 11
Electronic Connections 14
4-20mA Output Connections 16
Pulse Output Connections 18
Applying Power 20
Troubleshooting Guide 22
Drawings 23
Notes 24
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QUICK-START INSTRUCTIONS
This manual contains detailed operating instructions for the FDT-30 instrument.
The following condensed instructions are provided to assist an experienced
operator in basic operation of the instrument. If the operator is unfamiliar
with this type of instrument, refer to the detailed explanations located on
pages 10-32.
A. Select a flow meter mounting location with at least 10 pipe
diameters upstream and 5 diameters downstream from the
meter with no flow disturbances (i.e. elbows, tees, needle
valves, etc.). See Figure 1.
Figure 1
B. On horizontal pipe, choose a flow meter mounting location
within approximately 45-degrees of the side of the pipe. See
Figure 2. Locate the flow meter so that the pipe will be
completely full of liquid when flow is occurring in the pipe.
Avoid mounting on vertical pipes where the flow is moving in
a downward direction.
45°
NO
Figure 2
YES
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YES
45°
NO
FLOW METER MOUNTING ORIENTATION
C. Remove rust, scale and paint from the flow meter mounting
location. Clean to bare metal. Plastic pipes do not require
preparation.
D. Apply a thin, even layer of silicone grease to the two
transducer faces. Ensure that air bubbles are not present
over the two brown plastic sound-guides. Place the electronic
portion of the flow meter onto the prepared area of pipe,
making sure that the flow direction arrow is pointing in the
direction of flow. Place the clamp portion opposite the flow
meter and secure with the enclosed screws. Only moderate
torque is required on the screws—DO NOT OVER TIGHTEN
and DO NOT ROTATE the flow meter on the pipe once the
screws have been tightened.
E. Connect 11-30 Vdc to the power terminals within the FDT-30
transmitter. Ensure that the power supply is capable of
sourcing a minimum of 0.25 Amps. Observe polarity.
F. Connect either the 4-20mA, pulse output or both outputs to
the data acquisition or monitoring system as required.
G. Apply power.
H. If the pipe is full of liquid, a flow rate reading will appear. If
the pipe is empty or partially empty, a ERROR 0010 will be
shown on the display. The error will clear when flow resumes
and the pipe fills up with water.
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INTRODUCTION AND OPERATING THEORY
FDT-30 transit time flow meters measure flow velocity by sending
pulses of ultrasound energy back and forth between two
piezoelectric devices. See Figure 3. The piezoelectric components
are located behind the oval-shaped, dark plastic sound guides that
are embedded in the flow sensor clamp. If the liquid inside of the
pipe is moving, the sound will travel faster when it is sent in the
Figure 3
FDT-30
Sound Path
difference in time between upstream and downstream time
measurements. The FDT-30 compensates for gas content in the
liquid and will remove gaseous content from flow rate and totalizer
readings. Outputs from the flow meter include 4-20 mA analog,
turbine frequency output/pulse output.
direction of liquid flow than it
will when it is sent against the
liquid flow. The FDT-30
microprocessor generates the
pulses and measures the
elapsed time required for the
sound to travel between the
piezoelectric devices. Liquid
velocity is proportional to the
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SPECIFICATIONS/OPERATING CONDITIONS
For a complete table of specifications, contact Omega.
Description Specification
Input Voltage
Flow Range Reference
Sch 40 ½” Pipe
Sch 40 ¾” Pipe
Sch 40 1” Pipe
Sch 40 1¼” Pipe
Sch 40 1½” Pipe
Sch 40 2” Pipe
Accuracy
Environment
Ambient Temperature
Altitude
Humidity
Transient
Overvoltages
Pollution Degree
Enclosure Material
11-30 VDC @ 0.25A
0.1 to 40 FPS [0.03 to 12.4 MPS]
0.5 to 25 GPM [20 to 850 BPD]
1.0 to 55 GPM [40 to 1800 BPD]
2.0 to 100 GPM [80 to 3400 BPD]
4.0 to 150 GPM [170 to 5000 BPD]
5.0 to 220 GPM [170 to 7500 BPD]
8.0 to 400 GPM [275 to 13500 BPD]
±1% of rate above 1 FPS [0.3 MPS]
Indoor use
General Purpose: 0 to +185°F [-20 to +85°C]
Hazardous Area: 0 to +105°F [-20 to +40°C
Up to 2000 meters
-20º to 31ºC; 80% max; decreasing linearly to
50% at 40ºC
According to installation category 1, in accordance with IEC 664
2 in accordance with IEC 664
ABS/Polycarbonate
4-20 mA Output
Pulse Output
12-bit, sourcing, DC ground referenced
Turbine Frequency Output/Pulse Output—
Switch Selectable, non-ground referenced AC/
Ground referenced square wave, 0-1,000 Hz,
100mVpp minimum/5VDC.
SYMBOL EXPLANATIONS
Caution—Refer to accompanying documents
!
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FLOW METER COMPONENTS AND TERMINOLOGY
The pictures on the following two pages reference key
components and their respective terminology of the FDT-30
flow meter. These terms are utilized throughout this manual.
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SOUND GUIDES
CLAMP
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