Vortex RWG Series User manual

Vortex Flow Meters
RWG/RWBG Wafer Style Flow Meters
RNG Insertion Style Flow Meters
VRX-UM-00374-EN-06 (June 2018)
FLOW
Flow
Flow
User Manual

Vortex Flow Meters, RWG/RWBG Wafer Style Flow Meters & RNG Insertion Style Flow Meters
VRX-UM-00374-EN-06Page 2 June 2018

User Manual
VRX-UM-00374-EN-06 Page 3June 2018
CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Flow Ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Velocity Ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Straight-Run Piping Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RWG/RWBG Wafer Meter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RNG Insertion Meter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Hot Tap Insertion Flow Meter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
EMC Notication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Instructions Specic to Hazardous Area Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Current Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
HART Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Additional Installation Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Turbulence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Swirl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Sonic Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Velocity Prole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Flow Proling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Reducing the Pipe Diameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Vortex Flow Meters, RWG/RWBG Wafer Style Flow Meters & RNG Insertion Style Flow Meters
VRX-UM-00374-EN-06Page iv June 2018

Introduction
Page 5June 2018 VRX-UM-00374-EN-06
INTRODUCTION
The RNG/RWG/RWBG series vortex shedding flow meter family is designed to provide accurate and repeatable gas flow
measurement. These meters employ a patented ultrasonic technique to measure a form of turbulence created in the flow
stream. This turbulence, known as the Von Karman Vortex Street, is related to the flow through the pipe.
The RNG/RWG/RWBG series flow meter is a microprocessor based device, with HART compatible communications. The
primary output of the meter is a 2 wire, 4…20 milliampere (mA) current which is proportional to the flow.
With HART communications, users have the capability to remotely configure the meter. Typical operations, like re-scaling the
analog output, can be performed in comfort using a standard PC or HART 275/375/475 Communicator.
The wafer style meters are for pipe diameters four inches or less, and are installed between 150 lb flanges, or are
manufactured with pipe extensions and 150 lb flanges welded on the ends. These meters are calibrated in volumetric flow
units, that is Actual Cubic Feet per Minute (ACFM). Flow rates for the wafer style meters are listed in Table 2 .
The insertion style meters are retractable meters that are installed through the walls of a pipe or duct larger than four inches.
These meters can be installed through a 2 in. full port valve, which permits the unit to be retracted or inserted manually
without shutting down the system. Flow rates for the Insertion style meters are shown in Table 3.
DANGER
CAUTION SHOULD BE USED WHEN INSERTING OR RETRACTING AT PRESSURES EXCEEDING 60 PSIG (4.14 BARG).
SPECIFICATIONS
Wafer Insertion
Mounting Requirements Mounts between two 150 lb. flanges Options for 2 in. NPT, 2 in. 150# Flange, 2 in. 300# Flange, DN50 Flange
Operating Pressure –5…250 psig (–0.34 …17 barg)
Operating Temperature –20…300° F (–28…150° C)
Ambient Temperature –20…155° F (–28…68° C)
Accuracy ±1% of Reading over the upper 90% of the flow range
Repeatability 0.5% of reading
Input Power 28V DC Maximum
Output 4…20 mA (2 wire)
Table 1: Specifications
Flow Ranges
Gas / Air Application
Flow Ranges for RWG / RWBG Series
Model Pipe Size
in. (mm)
Flow ACFM (m³/hr)
Minimum Maximum
RWG05 0.5 (13) 0.4 (0.7) 16 (27)
RWG10 1 (25) 1.2 (2.0) 45 (77)
RWG15 1.5 (38) 2.0 (3.4) 100 (170)
RWG20 2 (50) 5.0 (8.5) 200 (340)
RWG30 3 (76) 10.0 (17.0) 400 (680)
RWG40 4 (102) 20.0 (34.0) 600 (1019)
Table 2: Flow Ranges for RWG / RWBG Series
Velocity Ranges
Gas / Air Application
Velocity Range for RNG Series
Model Pipe Size
in. (mm)
Velocity fps (mps)
Minimum Maximum
RNG
4 (102)
2 (0.6) 140 (43)
6 (152)
8 (203)
10 (254)
Table 3: Velocity Ranges for RNG Series
Flow measured in feet / second @ 14.69 psia, 60° F (meter / second
@ 1.013 bar, 16° C)

Installation
Page 6 June 2018VRX-UM-00374-EN-06
INSTALLATION
The flow meter is shipped completely assembled, tested and ready to install in its permanent location. See Figure 2 on page
7through Figure 5 on page 9 for the applicable outline dimensions for specific meters.
Straight-Run Piping Considerations
The sensor should be installed with 20 diameters, or more, of straight, unobstructed, full area pipe upstream of the flow meter
installation and 10 diameters, or more, downstream. This condition provides the fully developed, symmetrical flow profile that
is necessary to obtain accurate and repeatable results. The first obstruction up and downstream should be a full area elbow. If
the minimum straight run is not possible, the general rule is to have 80% of the straight run upstream and 20% downstream
from the flow meter installation.
High intensity ultrasonic noises should not be located upstream or downstream from the sensor. Common ultrasonic noise
sources include the following:
• Slightly cracked valves operating with large pressure drops.
• Small pipe leaks in high pressure systems.
• Venturies operating at near-sonic flow rates.
• Sonic nozzles.
If these ultrasonic noise sources cannot be eliminated, the meter should be mounted with at least one elbow between the
flow meter and the noise source.
Installation Location
The RNG/RWG/RWBG series meters uses ultrasonics to measure flow. An ultrasonic noise can interfere with this technique,
therefore high intensity, ultrasonic noise sources should not be located upstream or downstream from the meter. Common
mechanical ultrasonic noise sources include the following:
• Slightly cracked valves operating with large pressure drops.
• Small pipe leaks in high pressure systems.
• Venturies operating at near-sonic flow rates.
• Sonic nozzles.
If these ultrasonic noise sources cannot be eliminated, the meter should be mounted with at least one elbow between the
flow meter and the noise source.
Temperature and Pressure Tap Locations
User supplied pressure and temperature sensors should be mounted downstream from the flow meter. The pressure sensor
should be approximately 3 to 5 pipe diameters and the temperature sensor approximately 4 to 8 pipe diameters downstream.
Mechanical Installation
The meter should be installed with at least 20 pipe diameters of straight pipe upstream and 10 pipe diameters downstream.
This condition provides the fully developed, symmetrical flow profile that is necessary to obtain accurate and repeatable
results. Shorter upstream/downstream piping may be used although a shift in calibration may occur. If severe turbulence or
distorted flow profiles are present, flow straighteners should be used. See “Additional Installation Requirements” on page 17
for additional information.

Installation
Page 7June 2018 VRX-UM-00374-EN-06
RWG/RWBG Wafer Meter Installation
The labeling of the flow direction on the meter should be aligned with the flow in the pipe. If liquids or condensate can be
present in the flow, the meter should be installed so that liquids will not accumulate on the ultrasonic transducers (the small
buttons on either side of the vortex strut).
The RWG/RWBG series wafer meters are designed to mount between two ANSI 150 lb flanges. The meter should be mounted
so its inside diameter is centered inside the pipe. See Figure 1.
OTE:NGaskets (not provided) are necessary between the sensor and the ANSI flanges. Ensure that these gaskets are
properly installed and do not protrude into the flow stream.
The RWGxxF series flanged meters are designed to mount between two ANSI 150 lb flanges. See Figure 4 on page 8.
OTE:NGaskets (not provided) are necessary between the ANSI flanges. Insure that these gaskets are properly installed and
do not protrude into the flow stream.
AVOID BENDING THE VORTEX STRUT OR DAMAGING THE TRANSDUCERS DURING INSTALLATION. DO NOT REMOVE
COVER PLATES WHILE UNIT IS OPERATING.
Flow Flow
CORRECT
(Meter Centered In Pipe)
INCORRECT
(Meter Not Centered In Pipe)
Figure 1: Wafer position in the piping
Flow
Flow
4.38"
+.12
C
-.00
5.75
Cable Entry
Accommodates
.19/.25 Dia Cable
3/4 -14 NPT Connector
2.25.06 .06
E Dia
Both Sides
A Dia
B Dia
.531 Dia 4 Holes
Spaced at 90° on
D Dia BC
4.50
3/4-14 NPT
Pipe Plug
Figure 2: 1/2 in., 1 in. and 1-1/2 in. meters
Model Diameter A
in. (mm)
Diameter B
in. (mm)
Dimension C
in. (mm)
Dimension D
in. (mm)
Dimension E
in. (mm)
RWG/RWBG05 3.50 (89) 0.50 (13) 5.60 (142) 2.38 (61) 1.38 (35)
RWG/RWBG10 3.97 (101) 0.88 (22) 5.78 (147) 3.12 (79) 2.00 (51)
RWG/RWBG15 4.72 (120) 1.38 (35) 6.34 (161) 3.88 (99) 2.88 (73)

Installation
Page 8 June 2018VRX-UM-00374-EN-06
Flow
Flow
+.12
C
-.00
2.25.06 .06
4.38"
5.75
Cable Entry
Accommodates
.19/.25 Dia Cable
3/4 -14 NPT Connector
D Dia
Both Sides
A Dia
B Dia
4.50
3/4-14 NPT
Pipe Plug
Figure 3: 2 in., 3 in. and 4 in. meters
Model Diameter A
in. (mm)
Diameter B
in. (mm)
Dimension C
in. (mm)
Dimension D
in. (mm)
RWG/RWBG20 3.97 (101) 1.75 (45) 5.92 (150) 3.15 (80)
RWG/RWBG30 5.22 (133) 2.75 (70) 6.62 (168) 4.55 (116)
RWG/RWBG40 6.87 (174) 3.75 (95) 7.52 (191) 6.19 (157)
5.75
A
SENSOR S.N.: 64
PRESSURE SENSOR:
OUTPUT:4 - 20 mA
HEDLAND
by
4.69"
FLOW
FLOW
B
4.50
3/4-14 NPT
Pipe Plug
Figure 4: Outline dimensions for flanged series meters
Model Size Dimension B
in. (mm)
Dimension A
in. (mm)
RWG05F15* 1/2 in. 9.88…10.00 (250…254) 5.60 (142)
RWG10F15* 1 in. 9.88…10.00 (250…254) 5.78 (147)
RWG15F15* 1-12 in. 9.88…10.00 (250…254) 6.34 (161)
RWG20F15* 2 in. 9.88…10.00 (250…254) 5.92 (150)
RWG30F15* 3 in. 11.88…12.00 (301…304) 6.62 (168)
RWG40F15* 4 in. 11.88…12.00 (301…304) 7.52 (191)
*150 lb RF ANSI Flange

Installation
Page 9June 2018 VRX-UM-00374-EN-06
RNG Insertion Meter Installation
The RNG series insertion meters are designed to mount on a standard ANSI 150 lb, 2 in. pipe flange. If the main line can be
depressurized easily, then a simple installation consisting of a 2 in. nozzle and a 2 in. ANSI 150 Class flange may be used. This
permits the shortest shaft length which minimizes the clearance space. The measuring window should be installed in the
center of the line for line sizes 12 in. or less (see Figure 5 on page 9). For line sizes larger than 12 in., the measuring window
should be installed 25% to 50% of the way into the pipe. It is recommended that the internal dimensions of the line be
measured for accurate readings.
Insertion meters can be used in any size pipe four inches and larger in diameter. In order to calculate accurate volumetric,
mass, and standard flow measurements, it is recommended to enter the exact pipe size into the meter. Normally this
operation, along with overall meter configuration, is performed at the factory. However, the user can enter the pipe diameter
on site using the Badger Meter HART Interface or a HART 275/375/475 communicator.
OTE:NThe torque requirement for the Conax fitting is 90…100 ft-lb. See Figure 5 on page 9. See “Additional Installation
Requirements” on page 17 for additional installation information and flow profiling.
5.75
4.38"
13.0" Maximum at
Maximum Insertion
C Maximum
Retracted
4.50"
Maximum
B Maximum
Insertion
4.50" Maximum
Retracted
FLOW
.75"
FLOW
4.50
3/4-14 NPT
Pipe Plug
A
Measuring
Window
Figure 5: Outline dimensions for RNG insertion meters
Model Dimension A
in. (mm)
Dimension B
in. (mm)
Dimension C
in. (mm)
RNG12 12.00 (305) 12.88 (327) 21.50 (546)
RNG24 24.00 (609) 24.88 (632) 33.50 (851)
RNG36 36.00 (914) 36.88 (937) 45.50 (1156)
RNG48 48.00 (1218) 48.88 (1242) 57.50 (1461)
RNG60 60.00 (1524) 60.88 (1546) 69.50 (1765)

Installation
Page 10 June 2018VRX-UM-00374-EN-06
Hot Tap Insertion Flow Meter Installation
Where de-pressurizing the line for flow meter maintenance is impossible or undesirable, the“hot tap”method of installation
is used. This method involves inserting the flow meter through a 2 in. (51 mm) spool piece and a 2 in. (51 mm) full port valve
and will require a longer shaft length as well as greater clearance space for removal and installation.
DANGER
CAUTION SHOULD BE USED WHEN INSERTING OR RETRACTING AT PRESSURES EXCEEDING 60 PSIG (4.14 BARG).
Figure 6 shows a sample hot tap installation. With the exception of the spool piece, which must be a minimum of
4.5 in. (114.3 mm), all of the dimensions are suggestions only. Actual dimensions may vary depending on customer’s own hot
tap configuration.
To calculate the required insertion flow meters stem length:
• For pipe diameters less than or equal to 24 in. (609 mm): Calculate the distance from the center line of the pipe to the top
of the flow meter mounting flange.
• For pipe diameters greater than 24 in. (609 mm): Calculate the distance from the top of the flow meter flange to a point
1/4 of the pipe diameter into the pipe.
When flow profiling is required, calculate the distance from the bottom of the pipe to the top of the flow meter mounting
flange and subtract 2 in. (51 mm). Next round this distance up to the next largest 12 in. (305 mm) increment. This is the stem
length that should be ordered.
13.05" Maximum at
Maximum Insertion
FLOW
4.50" Maximum
Retracted
Standard ANSI
2 Inch 150 Lb. Flange
Determined
By Stem
Length
Determined
By Stem
Length
2" Full Port
Valve
Flow
4.50"
Maximum
Spool Piece
4.50" Minimum
5.75
Cable Entry
Accommodates
.19/.25 Dia Cable
3/4 -14 NPT Connector
4.38"
Figure 6: Hot tap configuration for RNG insertion gas meters
DANGER
USE CAUTION WHEN INSERTING OR RETRACTING AT PRESSURES EXCEEDING 60 PSIG (4.14 BARG).