OMNI
C2, F2, R2 and T2 Meters
User Guide
WUG-10003-02
Revision History
Rev No. Date Description
Rev 1 30-SEP-2009 Initial Release
Rev 2 15-MAR-2016 Added revised drawings, minor additions and corrections
Copyright
This document contains proprietary information. It is to be used only for the purpose for which it is intended.
Information in this document is subject to change without notice and does not represent a commitment on
the part of Sensus. No part of this publication may be reproduced, transmitted, stored in a retrieval system,
or granulated into any language in any form by any means, without the written permission of Sensus.
© Copyright 2016, Sensus. All Rights Reserved.
FlexNet® and associated logos are trademarks of Sensus and its subsidiaries and affiliates. All other brand
names may be trademarks of their respective owners.
Sensus
8601 Six Forks Road
Suite 700
Raleigh, NC 27615
1-800-638-3748
www.sensus.com
Document: OMNI User Guide
Document Number: WUG-10003-02
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Contents
Introduction
5 Specifications
OMNI Installation
6 Required Tools
6 Installation Instructions
Signal Connections
9 Description
9Features
9 Application
9 Electrical Connections
Measuring Chamber
13 Tools Required
14 Remove the Measuring Chamber
15 Disassemble the Measuring Chamber
17 Exchange the Measuring Insert
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Introduction 1
The OMNI family of meters are a technologically advanced set of water meters with no
restrictions as to sustained flow rates within its continuous operating range. OMNI
meters feature Floating Ball Technology (FBT), which allows the measuring element to
operate virtually without friction or wear.
Each OMNI meter consists of two basic assemblies: the maincase and the measuring
chamber. The measuring chamber assembly includes the “floating ball” impeller and
an all electronic programmable register. The OMNI electronic register is a hermetically
sealed register with an electronic pickup containing no mechanical gearing.
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Specifications
Category Specification
Input Power 12-24 VDC ± 10%
Output Signal Open Collector—Digital Signal
Wiring Red = + Power Supply Voltage
Green = Pulse, Switching to Ground
Black = Ground (- Power Supply Voltage)
Contact Closure Duration
Contact Open Duration
30ms Minimum (at 16Hz Output)
30ms Minimum (at 16 Hz Output)
a
b
Duty Cycle Approx. 50/50 ± 20% at normal flow rates
Pull-up Resistor (when
requir
ed)
6000 Ohms
Pulse Cable Length 25 ft. at meter
Pulse Cable Diameter 3.6 mm
Insulation Colors Red—12 to 24 VDC (Supply)
Green—Pulse, switching to GND
Black—GND
Maximum Cable Run -
1000 ft. without a repeater
Meter to Instrument
Lightning Protection Built-in lightning protection. Keep in mind that additional
lightning arrestors may be needed when long cables are used
to connect the register to devices which are not installed in the
same building as the register. The flash of lightning is not
compatible with the standards and can have greater energy
than any test can simulate.
a. With lower frequencies, the duration is longer. The duty cycle is roughly 40-60% closed/60-40%
open. It depends on the frequency, and is not as important as the contact timing.
b. With lower frequencies, the duration is longer. The duty cycle is roughly 60-40% closed/40-60%
open. It depends on the frequency, and is not as important as the contact timing
Introduction 5
OMNI Installation 2
Required Tools
• Correct tools for the corresponding size of bolts that are used. In the case of the
R2, 5/8” bolts are used for the 1-1/2” R2 and 3/4” bolts are used for the 2” R2.
• Hoisting devices may be required, depending on the weight of the meter and the
installation conditions.
Installation Instructions
To ensure valid registration, proper performance, and meter longevity, the following
factors should be considered when installing Sensus OMNI Meters.
1. When installing Sensus OMNI Meter with the strainer, a minimum of 2-½ pipe
diameters of straight run of pipe or equivalent full open components is required
upstream and downstream of the meter or strainer flanges. Full open flow
components may consist of: straight pipe, full open gate valves, bypass tees, all of
the same nominal size as the meter, and concentric reducers (1 nominal pipe size
reduction only).
2. Gate valves located immediately upstream or downstream are acceptable,
provided they are fully open during meter service and are not used to throttle flow
rates through the meter.
3. Install non-concentric reducers, check valves, back flow preventers, PRV
(pressure reducing valves), throttling devices, altitude valves no closer than 4 pipe
diameters downstream of the meter. Always avoid placing any of these devices
upstream of any meter since the placement will put the meter in a low pressure
zone thus possibly causing inconsistent accuracy and reduced longevity.
4. Accuracy levels may be determined by comparison accuracy testing either by
using a Sensus Portable Large Meter Tester, by removing the suspect meter and
testing it on a calibrated test bench or returning the suspect measuring chamber
or complete meter to Sensus Metering for a certified accuracy test
NOTE: High flow meter applications or near to open air discharge must maintain a
minimum of 25 psi downstream pressure to assure accuracy and meter longevity.
OMNI meters can be installed vertically or rotated on the bolt pattern in any
orientation. Contact Sensus with any questions.
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