Badger Meter Dynasonics Polymer RS-900w User manual

HYB-UM-03506-EN-01 (April 2022) User Manual
Ultrasonic Flow Meters
RS-900w Polymer

CONTENTS
Scope of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Introduction . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .3
Installation.. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .4
General Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mechanical Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
LED Light Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Controller Settings .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .6
Calibration Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specications .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .7
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Ultrasonic Flow Meters, RS-900w Polymer
April 2022HYB-UM-03506-EN-01Page ii

Scope of this manual
Page 3HYB-UM-03506-EN-01April 2022
SCOPE OF THIS MANUAL
This manual contains installation, operation and maintenance procedures for the
Dynasonics RS-900w Polymer Ultrasonic flow meters. Proper performance and
reliability of the product depend upon installation in accordance with
these instructions.
This safety sign signifies that this document must be read
prior to starting work or before operating equipment.
INTRODUCTION
The RS-900w Polymer Ultrasonic Flow Meters can be used with any compatible
irrigation controller, decoder sensor or pulse input type flow monitor. These
ultrasonic flow meters provide highly accurate readings of flow rate over a large
range of flow conditions.
The ultrasonic flow meter uses sound waves, transmitted through the moving
water in the irrigation pipe, to measure the speed of the water flow. Two
transmitters generate and receive the soundwaves. The soundwave moving
upstream will be slower than the soundwave moving downstream. The difference
in the transit time equates to the velocity of water flowing through the pipe.
The flow meter generates an electrical pulse frequency proportional to the flow
rate. An internal preamplifier allows the pulse signal to travel up to 2000 feet (610
meters) without further amplification. Power to operate the flow meter is provided
by the irrigation controller or flow monitor.
Flow meters of similar type are interchangeable, so there is no need for
recalibration after servicing or replacement. Ultrasonic and Impeller type flow
meters can also be interchanged because the output signal is similar, however the
K and Offset values might be different and require reprogramming at the irrigation
controller or flow monitor.
THE ULTRASONIC STYLE FLOW METER DESCRIBED IN THIS MANUAL IS NOT INTENDED
FOR USE IN SAFETY CRITICAL APPLICATIONS. USE OF THE DEVICE IN THIS MANNER IS
DONE AT THE SOLE DISCRETION OF THE CUSTOMER AND/OR END USER OF
THE DEVICE.
THE ULTRASONIC STYLE FLOW METER DESCRIBED IN THIS MANUAL IS NOT INTENDED
FOR USE IN SYSTEMS WITH FLAMMABLE LIQUIDS OR GASES. ADDITIONALLY, THE
DEVICE IS NOT INTENDED FOR SYSTEMS CONTAINING HAZARDOUS FLUIDS OR FLUIDS
OTHER THAN WATER.
THE ULTRASONIC STYLE FLOW METER DESCRIBED IN THIS MANUAL MUST BE
INSTALLED IN ACCORDANCE WITH ALL LOCAL AND FEDERAL CODES OR END-USE
STANDARDS, AS APPLICABLE.
IF THE DEVICES DESCRIBED IN THIS MANUAL ARE USED IN A MANNER NOT SPECIFIED
BY THE MANUFACTURER, THE PROTECTION PROVIDED BY THE EQUIPMENT MAY
BE IMPAIRED.
IF THE SYSTEM PRESSURE EXCEEDS 200 PSI (1379 KPA), A PRESSURE SAFETY VALVE
MUST BE INSTALLED.

Installation
April 2022HYB-UM-03506-EN-01Page 4
INSTALLATION
Depressurize, vent and drain the piping system prior to any installation or
maintenance of the flow meter.
General Installation Information
The accuracy of flow measurement for all flow measuring devices is dependent
on proper location of the sensor in the piping system. Entrapped air in the pipe
will cause inaccurate or“no-flow” readings. Accumulated debris or sediment in the
pipe will also affect accuracy and repeatability.
Ultrasonic flow meters are less affected by irregular flow velocity profiles caused
by valves, fittings, pipe bends, or other obstructions than Impeller style flow
meters. The RS-900w flow meter is designed with a long body that provides
sufficient upstream and downstream straight-pipe requirement in most situations.
It can be connected directly to a master valve or other device.
Installation Details
RS-900w
Mechanical Installation Procedure
1. Make sure the RS-900w ow meter arrow faces the direction of ow.
2. Apply Teon tape to the threads on the pipe and screw the pipe into the ow
meter. DO NOT OVERTIGHTEN.
Electrical Installation Procedure
MPORTANTI
Disconnect the power from the flow meter source and/or receiving device prior to any
installation or maintenance of the system. Flow meter source and/or receiving device
must provide basic isolation from mains for safe operation of the system.
OTE:NIf the flow meter has white and black wires instead of red and black,
connect the white wire wherever red is indicated.
1. Use watertight connectors/gel caps to connect the wire leads from the RS-
900w ow meter to a 2-conductor shielded 20 AWG (or larger) copper wire.
2. Route the cable from the RS-900w ow meter to the irrigation controller or a
Badger Meter ow monitor/endpoint. The cable may be extended up to 2000
feet. Be sure to leave enough exibility in the cable or conduit to allow for
future service of the ow meter, if necessary.

Installation
Page 5HYB-UM-03506-EN-01April 2022
3. When connecting to an irrigation controller or Badger Meter ow monitor/
endpoint, locate the section of terminal strip on the monitor labeled SENSOR
INPUT or SENSOR. Connect the red (or white) wire to IN, SIGNAL (+) or SIGNAL
terminal, connect the black wire to GND, SIGNAL (–) or COM terminal.
4. When interfacing with other equipment, consult the equipment manufacturer
for input designations. The signal wave forms and power requirements are as
shown in the "Specifications" on page 7.
5. After all electrical connections have been made, turn on power at the irrigation
controller or a Badger Meter ow monitor/endpoint.
The output of the flow meter is essentially a 15 Ohm switch with a 600 µA current.
With no flow running, the flow meter will appear to the controller input as a small
current load. When the flow rate is above the minimum threshold, it appears as a
quick series of 5 millisecond connections to ground.
LED Light Operation
LED lights on the top of the RS-900w flow meter will
indicate the conditions in the table below.
LED Light Condition Correction
Power LED
(Green) Off
There is no power to the flow sensor or
insufficient power for normal operation, or
the Red and Black wires have been reversed
at the controller.
Check the power and wiring.
Power LED
(Green) On
Power is connected and is sufficient for
operation. Normal operation
Forward Flow
LED (Green)
Off
Insufficient water in the pipe for proper
operation.
Check to ensure the pipe is full of water
and no air is trapped in the meter.
No water flow. Check for closed valves or obstructions
preventing water flow if not expected.
Forward Flow
LED (Green)
Flashing
Water is flowing in the forward direction. LED
will flash proportionally to the flow rate. Normal operation.
Reverse Flow
LED (Red)
On or flashing
Water is flowing in the reverse direction. LED
will flash proportionally to the flow rate.
Check arrow on meter is in the same
direction as expected flow. Check for
reverse flow conditions.

Controller settings
April 2022HYB-UM-03506-EN-01Page 6
CONTROLLER SETTINGS
The RS-900w flow meter uses unique K and offset numbers for calibration. These
numbers are derived from calibration runs using NIST traceable instruments.
Using both a K-factor and an offset number provides higher accuracy than using a
K-factor alone. The K and offset numbers for each meter configuration are listed in
the "Calibration Table" below.
Use the K and offset values in the frequency equation: Frequency = GPM - Offset
K
This equation describes the frequency of the output signal of all RS-900w flow
meters. By substituting the appropriate K-factor and offset values from the
table, the flow meter’s output frequency can be calculated for each pipe size.
This information is required when calibrating an output board, or when using
the raw flow meter data as direct output to interface with a device that is not a
Badger Meter product.
Calibration Table
Size K Offset Flow Range
1 inch (NPT or BSP) 0.25 0.000 1.30…50.0 GPM
1-1/2 inch (NPT or BSP) 1.70 -0.316 3.09…125 GPM
2 Inch (NPT or BSP) 2.85 0.144 5.13…200 GPM

Specications
Page 7HYB-UM-03506-EN-01April 2022
SPECIFICATIONS
Materials Body: glass filled nylon
Upper: polyphenylene oxide
Sizes
1 in. female taper threaded (NPT or BSP)
1-1/2 in. female taper threaded (NPT or BSP)
2 in. female taper threaded (NPT or BSP)
Flow Range &
Accuracy
Meter
Size
Normal Flow Range Extended Low Flow Range
Flow Range
gal/min
(liters/min)
Accuracy
% of
reading
Flow Range
gal/min
(liters/min)
Accuracy
gal/min
(liters/min)
1 in. 1.30…50.0 (4.92…189) ± 2 0.26…1.30 (0.98…4.92) ± 0.05 (± 0.19)
1-1/2 in. 3.09…125 (11.7…473) ± 2 0.62…3.09 (2.35…11.7) ± 0.13 (± 0.47)
2 in. 5.13…200 (19.4…757) ± 2 1.03…5.13 (3.90…19.4) ± 0.20 (± 0.76)
LED Indicators
Power (On/Off indication)
Reverse Flow (Flashing proportional to flow rate)
Forward Flow (Flashing proportional to flow rate)
Pressure
Rating 200 psi working pressure
Fluid
Temperature 32…140° F (0…60° C)
Ambient
Temperature 32…140° F (0…60° C)
Power/Output
Supply voltage = 8V DC min; 28V DC max.
Quiescent current = 600 µA (typical)
OFF state (VHigh) = Supply voltage – (600 µA * Supply impedance)
ON state (VLow) = 1.2V DC @ 40 mA (15 Ω + 0.7V DC)
Output
Frequency 0.5…200 Hz
Output Pulse
Width 5 msec ±25%
Environmental
Suitable for outdoor use below grade
IP 68 / NEMA 4X
Suitable for use in submerged installations (< 3 ft water, 24 hours)
Suitable for pollution degree 4 environments
Altitude: <2000 m (6560 ft)
Relative Humidity: 0…90%, non-condensing
Electrical Cable
4 ft of 2-conductor AWG 18 drain wire; shielded UL type PTLC wire provided for
connection to display or endpoint unit; rated to 221° F.
May be extended to a maximum of 2000 feet with 20 AWG (or larger) copper wire
suitable for direct burial, or appropriate for installation.
Water System
Certification NSF/ANSI/CAN 61 and 372 certified option
Compliance CE EMC Directive 2014/30/EU

Ultrasonic Flow Meters, RS-900w Polymer
www.badgermeter.com
Control. Manage. Optimize.
Dynasonics is a registered trademark of Badger Meter, Inc. Other trademarks appearing in this document are the property of their respective entities. Due to
continuous research, product improvements and enhancements, Badger Meter reserves the right to change product or system specications without notice, except
to the extent an outstanding contractual obligation exists. © 2022 Badger Meter, Inc. All rights reserved.
TROUBLESHOOTING
The RS-900w flow meter is an active device that can be verified with the LED lights
on the upper body, or tested at the connection point of the controller to which
they are connected. Before trying to troubleshoot, confirm that the flow rates are
well above the minimum recommended flow rates in the “Calibration Table” on
page 6. This will usually purge any air out of the line.
Symptom Possible Cause Recommended Action
All LED lights are off Power is not connected • Measure voltage at wire termination. If the
voltage at the controller drops below 7V DC
when the meter is connected, then the wires are
swapped or there is a short or moisture in the
wiring.
• Check voltage polarity: red wire +, black wire -
• Check for damaged wires or splices.
No flow reading
at controller, and
Power LED is on and
Forward Flow LED
is off
No water in meter • Check to ensure the pipe is full of water and no
air is trapped in the meter.
No flow • Check for closed valves or obstructions
preventing water flow.
No flow reading
at controller, and
Power LED is on and
Forward Flow LED is
flashing
Controller is not
programmed correctly
Flow rate is too low for
controller
• Check K and offset settings in the controller.
• Check the minimum frequency of the controller.
• Disconnect meter from the controller and
simulate an input to see if the controller registers
a reading.
No flow reading
at controller, and
Power LED is on and
Reverse Flow LED is
on or flashing
Meter is installed
backwards
• Check arrow on meter is in the same direction as
expected flow.
Backflow conditions • Check for possible backflow conditions, such as
leaking check valves when pumps are turned off.