This document discusses Dwyer Instruments' paddlewheel flow sensors and transmitters. It provides an overview of their product lines including the PFT, IPFS, PDWS, DFMT/DFMT2, as well as accessories like fittings and transmitters. Specifications, features, and applications are described for each product. The materials are intended as a resource for Dwyer customers and employees and may not be reproduced without permission.

1. Paddlewheel Flow Sensors
The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees
as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes.
Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used
without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.

2. Overview
PFT - Paddlewheel Flow Transmitter
IPFS - Paddle Flow Sensor
PDWS - Paddle Flow Sensor
DFMT/DFMT2 - Digital Paddle Flow
Transmitter

3. Operation Principle
Paddlewheel Flow
Sensors
Minimally invasive
monitoring of fluid
velocity in industrial
pipes
Cost effective in
comparison to other
technologies

4. PFT - Introduction
Paddlewheel transmitter
Inductive rotor sensing, no magnets
Good for magnetic materials

5. PFT - Specifications
Adjustable from 1-1/2 to 40”
(38 to 1016 mm) pipes
1.2 to 25 ft/s (0.37 to 7.62 m/s)
Linearity ±1% full range
Repeatability ±0.5% full range
NEMA 6P (IP69)

6. PFT - Features
One unit adjustable for range of pipe
sizes
1-1/2 to 40” (76 to 1016 mm)
Pulse or 4-20 mA output signal
In one unit with no need for converter
Brass or stainless body, variety of
o-rings
Low friction bearings

7. IPFS - Introduction
Adjustable insertion paddlewheel transmitter
Hall Effect sensor with pulse signal output
Good for low flow

8. IPFS - Specifications
Adjustable between 3 to 40” (76 to 1016 mm)
pipes
0.3 to 30 ft/s (0.09 to 9.14 m/s)
Accuracy ±1.5% full range
NEMA 4X (IP66)

9. IPFS - Features
Adjustable for range of pipe sizes
Brass, PVC, or stainless
Hot tap option (brass or stainless)
Use with Series SDF fittings
Optional bi-directional sensor

10. SDF Fittings
Use with PFT and IPFS sensors
Brass or iron, 3 to 24”
(76 to 609 mm) pipe size

11. PDWS - Introduction
Fixed insertion paddlewheel transmitter
Hall Effect sensor with pulse signal output
Good for low flow

12. PDWS - Specifications
Pipe sizes ½ to 8” (12.7 to 203 mm)
0.3 to 30 ft/s (0.09 to 9.14 m/s)
Accuracy ±1.5% full range
NEMA 4X (IP66)

13. PDWS - Features
Brass, stainless, PVC, or polypropylene body
Use with Series PWF fittings and tees
High pressure options
Immersion options

14. PWF - Fittings
Use with PDWS sensor
Bronze, PVC, SS, and steel
½ to 8” pipes
(12.7 to 203 mm)

15. DFMT & DFMT2 - Introduction
Digital paddlewheel sensor
Hall Effect sensor with analog or pulse output
Good for low flow
DFMT
DFMT2

16. DFMT & DFMT2 - Specifications
Sizes from 3/8 to 2” NPT ( 9.5 to 51 mm)
Measures flow from 0.5 to 180 GPM (0.1 to
40.0 m3/h)
Accuracy ±1.5% full range
IP65 rating
DFMT
Optional RS485 communications
DFMT2

17. DFMT & DFMT2 - Features
Measures instantaneous and
total flow
Resettable totalizer
User selectable 4-20mA or
pulsed output
Easy to use push buttons for
programming
Password Protection
DFMT
DFMT2

18. BAT Transmitter
Blind Analog Transmitter
Use with IPFS and PDWS
Converts pulse to 4-20mA
Meter or wall mount

19. RTI Transmitter
Rate/Total Indicator
Use with IPFS and PDWS
Converts pulse to 4-20mA
Meter, panel, or wall mount

20. PWD Pulse Divider
Pulse Divider
Use with any pulse output
transmitter
Pace electronic pumps

21. Applications
Irrigation
Ground water remediation
Cooling systems
Pump flow proving
Chemical Proportioning
Reverse Osmosis

22. Irrigation
Monitor water flow
rate for pivot
irrigation systems
and drip irrigation
systems
Ensure proper water
transfer

23. Groundwater Remediation
Monitor flow rate of water usage from water
source for the purpose of cleaning water source

24. Cooling Systems
Monitor water
flow in and out
of cooling
system
Use for
obtaining BTU
usage and
monitoring
efficiency with
BAS system

25. Chemical Proportioning
Pump proving
Continuous
monitoring of
chemical usage for
ideal chemical
proportioning or
dosing

26. Reverse Osmosis
Monitor water
flow in and out of
water filtration
system
Determine
amount of water
being processed

27. The materials included in this compilation are for the use of Dwyer
Instruments, Inc. potential customers and current employees as a
resource only. They may not be reproduced, published, or
transmitted electronically for commercial purposes. Furthermore, the
Company’s name, likeness, product names, and logos, included
within these compilations may not be used without specific, written
prior permission from Dwyer Instruments, Inc. ©Copyright 2014
Dwyer Instruments, Inc.