Xylem OMNI sensus C2 User manual

OMNI
C2, F2, R2 and T2 Meters
User Guide
WUG-10003-04

Revision history
Rev No. Date Description
Rev 01 30-SEP-2009 Initial Release
Rev 02 15-MAR-2016 Added revised drawings, minor additions and corrections
Rev 03 03-JUN-2020 Revisions for OMNI+ register.
Rev 04 21-APR-2021 Full OMNI+ release; updated SmartPoint module section.
Copyright
This document, in whole or in part, (“Document”) includes confidential and proprietary
information belonging to Sensus USA Inc. and/or one of its subsidiaries or affiliates.
Unauthorized use, reproduction, disclosure, distribution, or dissemination of this
Document is strictly prohibited. No party may use, reproduce, disclose, distribute, or
disseminate this Document for any purpose without express written authorization from
Sensus USA Inc. Any use, reproduction, disclosure, distribution, or dissemination of this
Document does not transfer title to, license, or grant any patent, copyright, trademark,
or other intellectual property rights. This Document, and any copies or derivatives
thereof, must be returned immediately on demand. This Document is subject to any
applicable non-disclosure agreement(s). Information in this Document is subject to
change without notice and does not represent a commitment on the part of Sensus.
© 2021, Sensus USA, Inc., a subsidiary of Xylem, Inc. All Rights Reserved.
Sensus, the Sensus logo, FlexNet® and associated logos are trademarks of Sensus and
its subsidiaries and affiliates. The N-Mark is a trademark or registered trademark of NFC
Forum, Inc. in the United States and in other countries.
Sensus USA
637 Davis Drive
Morrisville, NC 27560
1-800-638-3748
www.sensus.com
Document: OMNI C2, F2, R2 and T2 Meters User Guide
Document Number: WUG-10003-04
Revision history | ii

Contents
1 OMNI™ meter overview................................................... 4
OMNI™+ register.................................................................................. 4
Alarms.................................................................................................... 4
Data logging.......................................................................................... 4
OMNI meter specifications.................................................................... 4
2 LCD display....................................................................... 6
Segment Test view.................................................................................6
Totalizer view..........................................................................................7
Flow direction indicator..........................................................................8
Notification view.....................................................................................8
Smart Mode and Normal Mode.........................................................8
Notification icons...............................................................................9
Battery icon............................................................................................ 9
Dead battery read.................................................................................. 9
3 Signal connections.......................................................... 13
Electrical connection configuration options.........................................13
4 OMNI installation............................................................ 16
5 Measuring chamber.........................................................18
Remove the measuring chamber......................................................... 19
Disassemble the measuring chamber.................................................. 19
Exchange the measuring insert............................................................ 23
6 Two-way SmartPoint modules......................................... 24
Activate two-way SmartPoint modules.................................................24
FieldLogic errors.............................................................................. 28
Enable an unused port......................................................................... 32
Change two-way SmartPoint module configuration............................ 32
Get interval data from two-way SmartPoint modules.......................... 35
View two-way SmartPoint module details............................................ 37
Deactivate a two-way SmartPoint module........................................... 40
Contents | 3

1 OMNI™ meter overview
OMNI water meters feature unrestricted sustained flow rates within their continuous
operating range. The OMNI meter's Floating Ball Technology (FBT) measuring element
operates 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.
OMNI™+ register
The OMNI+ register features a programmable totalizer registration, an optional digital
pulse signal (C2/F2/T2 only), AMR reading digits, and a resettable test totalizer.
The OMNI+ register is designed for a non-explosive atmosphere. Because the register is
hermetically sealed, it is safe for pit environments as well as above ground settings. The
tamper-proof security cover can be positioned in any of 270 degrees of rotation, with
indexing points at each of the 90-degree customary register viewing positions. The
OMNI+ register is IP68 rated to 2 m.
Alarms
The OMNI+ alarms alert you to a myriad of conditions including reverse flow, leak, high
flow, and low battery life.
You can view alarms and event on the LCD display. Alarm state is logged hourly. You
can use field tools to retrieve the alarm log. In an AMI fixed-base system, alarms and
events are transmitted over FlexNet and you can user FieldLogic™ or Device Manager
to troubleshoot and clear the alarms.
Data logging
The OMNI+ logs 180 days of hourly data.
Data is retrieved directly from the meter and not through the SmartPoint due to battery
impact and time required to retrieve.
OMNI meter specications
Category Specication
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 User selectable fixed 5, 10, 20, 50, 200, 500 ms or
dynamic with a 32 ms Minimum (at 16Hz output)¹
1 OMNI™ meter overview | 4

Category Specication
Contact Open Duration User selectable fixed 5, 10, 20, 50, 200, 500 ms or
dynamic with a 32 ms Minimum (at 16Hz output)²
Duty Cycle Approx. 50/50 ± 20% at normal flow rates
Pull-up Resistor (when required) 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 - Meter to Instrument 1000 ft. without a repeater
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.
Note: There are two modes of pulse operation: Fixed and Dynamic.
For Fixed Rate, the Contact Open and Closure rate is set to the same minimum
duration. The meter supports settings of 5, 10, 20, 50, 200, and 500 ms Open
and Closure duration.
For Dynamic Operation, the length of the Open and Closure is based on the
number of pulses to be generated in a one second period. The minimum contact
closure duration is 32ms (16 Hz Output). A Maximum closed duration of 500ms (1
Hz Output) is supported.
¹ 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.
² 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.
1 OMNI™ meter overview | 5

2 LCD display
The LCD is the visual reporting mechanism for the meter.
The display contains dedicated display areas for information and icons. Multiple views
are available; use the lid to toggle through the various views. The first view available
when opening the lid is the Segment Test view. This is visible for one second and shows
all of the various display areas before flashing off.
The second view is the Totalizer view, which is the main visible view when the lid is
open. If the lid is left open, the display stays on in Totalizer view. If the lid remains open
for one hour in any view other than the Totalizer view, the display returns to the Totalizer
view. If the lid is closed and then reopened within 30 seconds, the display switches to
the next view in the sequence. If the lid is closed for more than 30 seconds, the view
resets and starts with the Segment Test view. The lid must be closed for two seconds to
advance to the next view.
The OMNI+ supports the following views:
Segment Test view
Totalizer view
Notification view (for alarms)
Flow Rate view
Totalizer Test view
Segment Test view
The Segment Test view displays all icons to ensure they are all still operational. This view
helps testers and operators troubleshoot the display to ensure parts of the display
correctly display as expected and stop displaying as expected.
The Segment Test view is always available regardless of the device type or operating
mode the device may support.
The segment test only flashes segments that have a use on the device. For example, if
the device does not support meter size, the meter size icons do not display during the
segment test for that device.
The OMNI+ does not use the meter size or radio icons. The segment test displays as
follows:
2 LCD display | 6

Totalizer view
The accumulation displays digits and decimal points. The units of measurement display
in the lower-left corner of the LCD.
The Totalizer view displays consumption values or messages, AMI/AMR digit identifier
bars, the unit of measure, the flow direction, and any notification icons that are currently
active.
The bars indicate which digits are reported . The units of measurement display in the
lower-left corner of the LCD. The OMNI+ supports five units of measure which are
displayed as:
Gallons
Cubic feet
Cubic meters
Imperial gallons
Acre feet
2 LCD display | 7

Flow direction indicator
The LCD displays a flow direction indicator at the lower right. A circle containing a "+"
represents a positive flow while a circle containing a "-" represents a negative flow. If no
circle is present, there is no flow or the flow is so minimal it cannot be detected.
Notication view
The Notification view provides more information about any alarms or events that have
been triggered. This is in addition to the bell and flag icons that display on the LCD.
The first two digits on the left in Notification view are AL, which is the indication that you
are in Notification view. The remaining six digits in that line display the alphanumeric
symbol for the alarm or event, with the most recent being the first one on the right and
moving from right to left. Only six alarms or events can display at the same time. Active
events flash.
For more information on alarms and events, see Alarms and events.
Smart Mode and Normal Mode
The OMNI+ can be configured in either Smart Mode or Normal Mode.
In Smart Mode, the register read consists of the AMI/AMR reading digits, the customer
ID, and any alarms present with a timestamp. In Normal Mode, the register read only
has the customer ID and the AMI/AMR reading digits. In Normal Mode alarm
information is still available, but only by retrieving a data log; no alarm information is
passed on to an AMI system.
The third LCD digit from the left indicates the register is configured for Normal reading
mode. A lowercase ‘n’ displays in the third digit from the left when the meter is
configured for Normal reading mode.
If the device is reporting in any other mode other than Normal mode, such as Smart
Meter mode, the third value is blank.
2 LCD display | 8

Notication icons
Two notification icons display in the upper-right corner of the LCD (in all views) when the
applicable conditions are present.
The Bell icon represents an Active event or alarm. Active events occur when the device
detects that the meter is currently in this event. As long as the meter is in this event, the
bell icon remains visible. When the event ceases, the icon is no longer visible. If the
active icon is visible, the operator can switch to Notification view to see which events are
currently set. Additionally, the utility can use field tools to extract the events for further
troubleshooting.
The Flag icon represents a recent event or alarm. Recent events indicate that an event
occurred within a predetermined time frame.
Battery icon
The OMNI LCD displays a battery icon to represent battery life. This icon displays in all
views when the battery is low or needs to be replaced.
The battery notification displays on the LCD when any of the following conditions are
triggered:
Near End of Life Alarm - A near end of life notification is triggered 9.5 years from
the date of installation or 10.5 years from the date of manufacture, whichever comes
first. This notification remains active until the end of life alarm is triggered.
End of Life Alarm - An end of life notification is triggered 10 years from date of
installation or 11 years from date of manufacture, whichever comes first. The LCD
indicates an end of life notification by flashing the battery icon in 0.5 sec intervals.
Low Battery Volts - The low battery volts notification is triggered when the battery
voltage drops due to over usage. This low voltage alarm indicates the battery will
expire soon, so the device must be replaced. The LCD indicates a low battery volts
notification by flashing the battery icon in 0.5 sec intervals.
Dead battery read
The Omni+ register contains a near field communications (NFC) interface. This interface
can be used to retrieve a last time read from a register that has failed due to a dead
battery or other reason.
The information is stored as a standard NDEF type 5 text record and can be read with
any compatible NFC reader such as a mobile phone. The information in the NFC tag is
updated every 15 minutes. Compatible phones include iPhone 7 or newer and most
advanced Android phones.
2 LCD display | 9

The NFC antenna is located around the perimeter of the LCD. The NFC tag can be read
by placing a compatible device such as a NFC enabled iPhone or Android parallel with
the register face. In addition, the device's NFC antenna must be aligned with the center
of the OMNI+ LCD. The location of the NFC antenna varies by device but is typically
found on the back of the device near the top or center. The following example is for
iPhone.
Many Android phones have the NFC function built in and the tag can be read by simply
tapping the tag. This example uses the NFC-Reader app available from the App Store
but any compatible reader program will work.
After opening the application, select Scan.
2 LCD display | 10

Tap the phone against the NFC tag near the LCD. The following screen displays,
showing the fields that are stored in the NFC tag.
2 LCD display | 11

The PV field displays the firmware version, the FI field displays the factory identification,
and the CI field displays the customer identification. The latest volume reading displays
in the V field and the D field displays the date and time of the last reading. The
remaining fields contain diagnostic information that Sensus Technical Services may
request.
2 LCD display | 12

3 Signal connections
The OMNI+ registers use fully solid-state electronics.
The OMNI+ C2/F2/T2 register is available with an optional programmable digital pulse
signal suited for interfacing with ACT-PAK instruments and SCADA systems to achieve a
4 to 20 mA output.
The OMNI+ R2 register outputs a programmable (using a Sensus FieldLogic
Communicator) register ID and AMR reading digits.
Electrical connection conguration options
The OMNI+ C2/F2/T2/R2 register is standard with AMR output wires in a variety of
lengths and interfaces. The OMNI+ C2/F2/T2 register is available with an optional 25
foot long pulse wire. Splicing of these wires or connecting to these wires should be
performed in accordance with standard practices depending on the environment of the
application. Care must always be taken when connections are made for meters in high
humidity or flooded pit settings. Maximum pulse cable length should be 1000 feet
without a repeater.
The OMNI+ register can be configured in four arrangements, shown in the following
illustrations.
Illustration 1
Illustration 1 is used when the OMNI is connected to a PLC (e.g., in a SCADA system).
The PLC should not have an internal pull-up resistor in its input circuit (no DC voltage at
the instrument inputs). Usually the instrument must be isolated by having an optical
isolator at its inputs.
3 Signal connections | 13

Illustration 2
Illustration 2 is used for all instruments with internal pull-up resistors. The voltage
supplied by the instrument's input when not connected to any circuitry should not
exceed 24 Vdc nom. and must not exceed 30 Vdc max. Otherwise, it will overload the
MOSFET inside the OMNI+ register. The voltage supplied to the register is allowed to
be different from the instrument's supply voltage.
Ground is common for both the OMNI+ register and instrument.
Illustration 3
Illustration 3 is used for instruments without internal pull-up resistors and without optical
isolators internal to their inputs. Ground is common for both the OMNI+ register and
instrument. When the OMNI's MOSFET is open (not conductive), nearly the full voltage
supplied to the OMNI will occur at the instrument's input. It must be able to withstand
this voltage (24 VDC in Illustration 3).
*In case the instrument's input provides optical isolation, the connection shown in
Illustration 1 should be used.
3 Signal connections | 14

Illustration 4
R1 R2 Vinstrument
2k 2k Vsupply/2
2k 1k Vsupply/3
6.8k 1k ~Vsupply/8
The table and formula are valid under the assumption that the instrument's input
resistance is higher than
50 kOhms. Otherwise, Vinstrument will be lower than shown in the table or calculated
with the formula.
*If possible, the circuit of Illustration 2 should be used.
3 Signal connections | 15

4 OMNI installation
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 ¾" bolts are used for the 2" R2.
Depending on the weight of the meter and the installation conditions, hosting
devices may be required.
Installation factors
To ensure valid registration, proper performance, and meter longevity, the following
factors should be considered when installing Sensus OMNI Meters.
1. When installing a 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 (one 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, pressure
reducing valves (PRV), throttling devices, and altitude valves no closer than four 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 by 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.
4 OMNI installation | 16

5. OMNI meters can be installed vertically or rotated on the bolt pattern in any
orientation. Contact Sensus with any questions.
6. No mechanical stresses should be exerted on the meter when installed in the
pipeline. The pipeline flanges must align with the meter flanges, the distance
between the flanges must match the meter body length, and the weight of the
meter must be supported evenly. Misalignment stresses can cause the meter body
or flanges to crack; thus, when the pipeline is under pressure, flooding can occur.
7. The meter must not be subjected to pressures higher than the pressure rating
printed on the data sheet. Pressures higher than the pressure rating can cause leaks
or burst the meter body.
8. Gaskets must not protrude into the pipeline or be misaligned.
9. The pipeline must be thoroughly flushed before installing the meter to prevent
damage from debris.
10. The flow direction of the meter (indicated by the arrow on the meter body) must
correspond with the flow direction in the pipeline.
11. After installation of the meter, the pipeline, strainer, and meter must be purged of
air and filled with water very slowly to prevent the meter from being damaged by
surges. Filling the pipe too rapidly can cause air and water surges, which can destroy
the meter insert.
12. The installation site should be chosen to prevent air bubbles from collecting in the
meter, and the pipeline must always be completely filled with water. Installation of a
meter at the highest point in a pipeline must be avoided.
13. The manufacturer's normal flow must not be exceeded for extended periods.
Applications with questionable water quality should be addressed with Sensus
Engineering before meter installations.
14. The meter should be protected from stones, sand, and fibrous material.
15. The meter must be protected from pressure surges.
4 OMNI installation | 17

5 Measuring chamber
The measuring chamber can be removed and disassembled when required to do so.
This section describes the steps for doing so.
Note: If the meter is under pressure, pressure must be turned off and relieved
before chamber bolts are loosened or removed!
Required tools
2.5, 3, and 6mm hex head ball end drivers (6mm not needed for the R2)
Sensus seal screw tool—for bonnet removal
Open end/box wrenches as determined by size and type of OMNI meter
7/16"x1/2" open end/box wrench
9/16" x 5/8" open end/box wrench
3/4" x 11/16" open end/box wrench
15/16" open end/ box wrench
Assembly grease
5 Measuring chamber | 18

Remove the measuring chamber
Chamber Cover
Bolts
Chamber Cover
Bolt Washers
Chamber Cover
O-Ring
Chamber Cover
Measuring
Chamber
Note: Chamber Bolt quantity varies
by meter size
(Black nylon washers are below
the stainless steel washers)
1. With the service line pressure off, loosen all chamber cover bolts.
2. Continue loosening the bolts until all bolts and washers can be removed.
3. Use a medium-size screwdriver to pry between the valve body and chamber cover at
the upstream cover bolt seal wire rib until the cover raises out of the body.
4. Remove the measuring chamber and place the chamber cover O-ring in a safe,
clean place.
Disassemble the measuring chamber
The following steps and accompanying illustrations explain how to disassemble the
OMNI measuring chamber for part replacement.
1. Remove the bonnet seal screw (4) using the Sensus seal removal tool.
2. Twist the bonnet (53 or 3) counter-clockwise and lift it off the base.
3. Raise the register (55 or 5) off the base, taking care to not strain the pick-up probe
wire.
4. Using your fingers (or a 7/16" wrench, if required), remove the probe retaining nut*
and remove the register and probe assembly from the measuring insert. (13).
5 Measuring chamber | 19

Note:
If the pipe pressure is not relieved yet, water will spray out when the
retaining nut is two turns from complete removal.
When re-installing, use fingers only and check for leaks before installing the
bonnet.
5. Place the register assembly in a safe place.
6. Remove the bonnet retaining ring (57 or 7) by removing the four allen head
countersink screws (3).
7. Remove the four allen head screws (14) from the measuring insert (13).
8. Pull the measuring insert (13) away from the chamber cover (11A).
9. Twist the inlet flow straightener balance plate (17) counter-clockwise, then pull it
straight out of the measuring insert housing.
Note: Take care to slowly separate the two housings or the rotor will fall out
of the measuring insert and will be damaged.
Do not remove the chamber seal gasket (12). It is factory glued in place for
ease of chamber installation. If a replacement gasket is required, you must
use a waterproof glue to attach it to the chamber.
10. Remove the rotor (16) from the measuring insert by slowly pulling it out of the
housing.
11. Inspect and replace any damaged parts.
12. For re-assembly, reverse this procedure.
5 Measuring chamber | 20