The document provides an overview of open channel flow panel meters developed by Dwyer Instruments, Inc., detailing various products that utilize Doppler radar and ultrasonic technology for accurate flow and level measurements. Each product, including specifications, features, and applications, is designed for specific environments such as wastewater facilities and river flow measurement. Usage guidelines emphasize that proprietary company materials are not to be reproduced without permission.

1. Open Channel Flow
Panel Meters
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
RVM ULF ULS SPPM

3. RVM – Introduction
Uses Doppler Radar technology to measure
surface velocity of open channel flow
Flow velocity can be measured bi-directionally
with user-selectable directional modes

4. RVM – General Specs
Range: 0.1 to 43 fps (0.3 to 13 m/s)
Accuracy: ±5%
Power Requirements: 6.1 to 8 VDC, (6) 1.2 V
rechargeable AA NiMH batteries, installed and
functional, user replaceable (12 VDC lighter plug power
cable included)
Power Consumption: 0.18 A max
Serial Communications: RS232 (with purchase of A-RVM-
CC)

5. RVM - Features
Higher accuracy
Doppler radar technology
Works with shallow flow depths
Field rechargeable

6. ULF – Introduction
Ultrasonic continuous flow measurement
transmitter
Perfect for direct installation over flumes and
weirs and compensates for virtually all
environmental conditions such as vapors, gases,
temperature variations, and wind

7. ULF – Specifications
Wetted Materials:
Sensor: Polypropylene
Acoustic window: ECTFE
Ranges:
ULF-X1-XXX: 0.82 to 16.4 ft (0.25 to 5 m)
ULF-X2-XXX: 1.96 to 49.2 ft (0.6 to 15 m)
Accuracy: 0.25% of max. range (at 20°C)

8. ULF – Specifications
Output Signal: 4 to 20 mA
Enclosure: Plastic enclosure: ABS & UV
resistant body
Enclosure Rating: NEMA 4 (IP65)

9. ULF - Features
High accuracy (0.25% of max range)
Automatic ambient temperature compensation
ABS & UV resistant body
Programmed with standard weir and flume sizes

10. ULS Introduction
ULSS ULSM ULSL

11. ULS-Introduction
Non-contact, continuous ultrasonic level
measurement for short range applications
Automatic temperature compensation for more
accurate measurements
Four relays for control applications

12. ULS-General Specifications
Range:
ULSS: 49.2” (1.25m)
ULSM: 9.8’ (3.0m)
ULSL: 18.0’ (5.5m)
Accuracy:
ULSS: 0.125” (3mm)
ULSM: +/‐ 0.2% of range
ULSL: +/‐ 0.2% of range
Compliance: CE, RoHS

13. ULS - Features
Selectable Deadband
Fail-safe logic for control applications
Four programmable relays
Narrow beam width and short deadband
Automatic Temperature Compensation

14. SPPM-Introduction
Configurable, full color display
Can easily be customized to read and/or graph
pressure, temperature, humidity, gas
concentration, or many other parameters
Purchase by display size and input

15. General Specification
Inputs: Current: 0 to 50 mA, scalable (factory set from 4 to 20
mA); Voltage: 0 to 40 VDC, scalable (factory set from 0 to 10 V)
Accuracy: 0.1%
Display: 2.4˝, 2.8˝ or 3.5˝ TFT full color touch screen
Display Resolution: 320 x 240 pixels
Software Requirements: Compatible with Windows® XP,
Windows® 2000, Windows® 7 and Windows Vista®
Approvals: CE, RoHS

16. SPPM - Features
USB Connection
Windows based software
Multiple screen sizes
Field configurable
Touch screen display

17. Ultrasonic Applications
Fly Ash Silos - Level Measurement

18. Ultrasonic Applications
River Water - Level Measurement

19. Ultrasonic Applications
Waste Water Facilities - Level Measurement

20. Ultrasonic Applications
Storage Tanks - Level Measurement

21. Ultrasonic Applications
Water Towers – Level Measurement

22. Ultrasonic Applications
River Flow - Velocity Measurement

23. Ultrasonic Applications
Process Plants – Water Flow Measurement

24. Ultrasonic Applications
Water Treatment – Open Channel Flow

25. Ultrasonic Applications
Dams – Water Flow Measurement

26. SPPM Applications
Skid Builders - Instrumentation

27. SPPM Applications
Power Plants – Control Rooms

28. SPPM Applications
Process Industries – Control Rooms

29. SPPM Applications
Utility Companies - Control Rooms