VorTek Pro-V M22 User manual

Series M22/M23/M24 Instruction Manual Table of Contents
M-000-00010 0-1
VorTek Series M22, M23 and M24
Pro-V™ Vortex Volumetric and Mass Flow Meters
Instruction Manual
Document Number M-000-00010
Rev 8/2018
8475 W I-25 Frontage Rd
Suite 300
Longmont, CO 80504
[phone] [phone] Fax [phone]
http://www.vortekinst.com

Table of Contents Series M22/M23/M24 Instruction Manual
0-2 M-000-00010
Customer Notice for Oxygen Service
Unless you have specifically ordered VorTek’s optional O2cleaning, this flow me-
ter may not be fit for oxygen service. Some models can only be properly cleaned
during the manufacturing process. VorTek Instruments, LLC., is not liable for any
damage or personal injury, whatsoever, resulting from the use of VorTek Instru-
ments standard mass flow meters for oxygen gas.
Specific Conditions of Use
(ATEX/IECEx)
Contact Manufacturer regarding Flame path information.
Clean with a damp cloth to avoid any build-up of electrostatic charge.
The Model M22, M23, M24 and Pro-VTM Multivariable Mass Vortex Flowmeters
standard temperature option (ST) process temperature range is -40°C to 260°C.
The high temperature option (HT) process temperature range is -40°C up to
+400°C.
Pro-VTM Multivariable Mass Vortex Flowmeters
Tmax
(Process)
Temperature Class Value (Gas)
ST Version
HT Version
80°C
T6
85°C
95°C
T5
100°C
130°C
T4
135°C
195°C
T3
200°C
260°C
T2
300°C
400°C
N / A
405°C
Notice to Users
Warning based on Electric Appliances Safety Control Act of Korea. This product
should be handled as electromagnetic radiation emitting equipment, and is in-
tended for use by industrial dealers and end-users. It is not for residential use.
NIST Standard Reference Database 23, NIST Reference Fluid Thermodynamic and
Transport Properties: REFPROP Version 9.x. Standard Reference Databases are copy-
righted by the U.S. Secretary of Commerce on behalf of the United States of America. All
rights reserved. No part of the database may be reproduced, stored in a retrieval system
or transmitted, in any form or by any means, electronic, mechanical, photocopying, record-
ing or otherwise without prior permission.

Series M22/M23/M24 Instruction Manual Table of Contents
M-000-00010 0-3
© COPYRIGHT VORTEK INSTRUMENTS 2018
No part of this publication may be copied or distributed, transmitted, transcribed, stored in
a retrieval system, or translated into any human or computer language, in any form or by
any means, electronic, mechanical, manual, or otherwise, or disclosed to third parties
without the express written permission of VorTek Instruments. The information contained
in this manual is subject to change without notice.
TRADEMARKS
Pro-V™ is a trademark of VorTek Instruments, LLC. Other product and company names
listed in this manual are trademarks or trade names of their respective manufacturers.

Table of Contents Series M22/M23/M24 Instruction Manual
0-4 M-000-00010
Table of Contents
Chapter 1 Introduction
Pro-V™ Vortex Mass Flow Meters ..................................................... 1-1
Using this Manual ......................................................................... 1-1
Note and Safety Information ......................................................... 1-2
Receipt of System Components .................................................... 1-2
Technical Assistance ..................................................................... 1-2
How the Pro-V Vortex Meter Operates ............................................... 1-3
Velocity Measurement .................................................................. 1-3
Vortex Shedding Frequency.......................................................... 1-4
Vortex Frequency Sensing ............................................................ 1-4
Flow Velocity Range..................................................................... 1-5
Pressure Drop ................................................................................ 1-6
Minimum Back Pressure ............................................................... 1-6
Temperature Measurement............................................................ 1-7
Pressure Measurement................................................................... 1-7
Flow Meter Configurations.................................................................. 1-8
Multivariable Options ................................................................... 1-8
Line Size / Process Conditions / Materials.................................... 1-9
Flow Meter Electronics ................................................................. 1-9
Chapter 2 Installation
Installation Overview........................................................................... 2-1
Flow Meter Installation Requirements .......................................... 2-1
Unobstructed Flow Requirements ................................................. 2-2
Recommended Meter Locations.................................................... 2-3
Series M22 and M24 In-Line Flow Meter Installation ........................ 2-4
Wafer-Style Flow Meter Installation............................................. 2-5
Flange-Style Flow Meter Installation............................................ 2-6
Series M23 Insertion Flow Meter Installation ..................................... 2-7
Cold Tap Guidelines...................................................................... 2-8
Hot Tap Guidelines ....................................................................... 2-9
Flow Meter Insertion ......................................................................... 2-11
Installing Meters with a Compression Connection ..................... 2-12
Installing Meters with a Packing Gland Connection................... 2-14
Installing Meters (Packing Gland), No Insertion Tool................ 2-17
Adjusting Meter Orientation.............................................................. 2-19
Display/Keypad Adjustment ....................................................... 2-19
Enclosure Adjustment ................................................................. 2-20
Loop Power Flow Meter Wiring Connections................................... 2-21
Input Power Connections ............................................................ 2-21
4-20 mA Output Connections ..................................................... 2-22
Pulse Output Connections ........................................................... 2-23
Frequency Output Connections ................................................... 2-24
Optional Backlight Connections ................................................. 2-24
Remote Electronics Wiring ......................................................... 2-25
High Power Flow Meter Wiring Connections ................................... 2-27
Input Power Connections ............................................................ 2-27

Series M22/M23/M24 Instruction Manual Table of Contents
M-000-00010 0-5
4-20 mA Output Connections ..................................................... 2-29
Frequency Output Connections................................................... 2-30
Pulse Output Connections ........................................................... 2-31
Alarm Output Connections.......................................................... 2-33
Remote Electronics Wiring ......................................................... 2-34
Optional Input Electronics Wiring .............................................. 2-35
Optional Energy EMS RTD Input Wiring .................................. 2-35
Optional External 4-20 mA Input Wiring ................................... 2-36
Optional Contact Closure Input Wiring ...................................... 2-37
Chapter 3 Operating Instructions
Flow Meter Display/Keypad................................................................ 3-1
Start Up................................................................................................ 3-2
Run Mode Screens............................................................................... 3-3
Using the Setup Menus........................................................................ 3-4
Programming the Flow Meter ....................................................... 3-5
Output Menu ................................................................................. 3-6
Display Menu ................................................................................ 3-8
Alarms Menu................................................................................. 3-9
Totalizer #1 Menu ....................................................................... 3-10
Totalizer #2 Menu ....................................................................... 3-11
Energy Menu....................................................................... 3-12
Fluid Menu .................................................................................. 3-13
Units Menu.................................................................................. 3-14
Time and Date Menu................................................................... 3-15
Diagnostics Menu........................................................................ 3-16
Calibration Menu......................................................................... 3-17
Password Menu ........................................................................... 3-18
Chapter 4 Serial Communications
HART Communications ...................................................................... 4-1
Wiring ........................................................................................... 4-1
HART Commands with the DD Menu.......................................... 4-3
HART Commands with Generic DD Menu .................................. 4-8
MODBUS Communications ................................................................ 4-9
Wiring ........................................................................................... 4-9
Menu Items.................................................................................. 4-10
Register Definitions..................................................................... 4-12
BACnet MSTP Communications....................................................... 4-19
BACnet MSTP Description......................................................... 4-19
Baud Rates on the MS/TP Bus .................................................... 4-19
Supported BACnet Objects ......................................................... 4-20
ANNEX - BACnet Protocol Implementation Conformance
Statement..................................................................................... 4-26
Acronyms and Definitions .......................................................... 4-32
Chapter 5 Troubleshooting and Repair
Hidden Diagnostics Menus.................................................................. 5-1
Level One Hidden Diagnostics Values ......................................... 5-3

Table of Contents Series M22/M23/M24 Instruction Manual
0-6 M-000-00010
Level Two Hidden Diagnostics Values......................................... 5-4
Analog Output Calibration .................................................................. 5-7
Display Contrast Adjustment .............................................................. 5-7
Troubleshooting the Flow Meter ......................................................... 5-8
First Check Items ................................................................................. 5-8
Record Values...................................................................................... 5-8
Determine the Fault ............................................................................. 5-9
Symptom: Output at no Flow ........................................................ 5-9
Symptom: Erratic Output .............................................................. 5-9
Symptom: No Output .................................................................. 5-11
Symptom: Meter Displays Temperature Fault ............................ 5-12
Symptom: Meter Displays Pressure Fault ................................... 5-13
Electronics Assembly Replacement................................................... 5-14
Pressure Sensor Replacement (Series M22 and M24 Only) ............. 5-15
Returning Equipment to the Factory.................................................. 5-15
Appendix A Product Specifications
Appendix B Approvals
Appendix C Flow Meter Calculations
Appendix D Glossary
Figures
1-1. In-Line Vortex Multi-Parameter Mass Flow Meter................ 1-3
1-2. Measurement Principle of Vortex Flow Meters...................... 1-4
1-3. Reynolds Number Range of the Pro-V................................... 1-6
2-1. Recommended Pipe Length Required for Installation............ 2-2
2-2. Flange Bolt Torquing Sequence ............................................. 2-3
2-3. Wafer-Style Flow Meter Installation ...................................... 2-4
2-4. Flange-Style Flow Meter Installation ..................................... 2-5
2-5. Hot Tap Sequence................................................................... 2-9
2-6. Insertion Calculation (Compression Type)........................... 2-11
2-7. Flow Meter with Compression Type Fitting......................... 2-12
2-8. Insertion Calculation (Meters with Insertion Tool) .............. 2-13
2-9. Flow Meter with Permanent Insertion Tool.......................... 2-14
2-10. Flow Meter with Removable Insertion Tool......................... 2-15
2-11. Insertion Calculation (Meters without Insertion Tool) ......... 2-16
2-12. Display/Keypad Viewing Adjustment .................................. 2-18
2-13. Enclosure Viewing Adjustment ............................................ 2-19
2-14. Loop Power Wiring Terminals ............................................. 2-20
2-15. DC Power Connections......................................................... 2-20
2-16. Load Resistance Versus Input Voltage................................. 2-21
2-17. Isolated Pulse Output Using External Power Supply ........... 2-22
2-18. Non-Isolated Pulse Output Using External Power Supply ... 2-22

Series M22/M23/M24 Instruction Manual Table of Contents
M-000-00010 0-7
2-19. Isolated Frequency Output Using External Power Supply ... 2-23
2-20. Non-Isolated Freq. Out. Using External Power Supply........ 2-23
2-21. Backlight Using External Power Supply .............................. 2-23
2-22. Loop Power Volumetric Flowmeter Junction Box ............... 2-24
2-23. Loop Power Volumetric Flowmeter Junction Box Prior ...... 2-25
2-24. Loop Power Mass Flowmeter Junction Box......................... 2-25
2-25. AC Wiring Terminals ........................................................... 2-26
2-26. AC Power Connections......................................................... 2-26
2-27. DC Wiring Terminals ........................................................... 2-27
2-28. DC Power Connections......................................................... 2-27
2-29. Load Resistance Versus Input Voltage................................. 2-28
2-30. Isolated 4-20 Output Using External Power Supply............. 2-28
2-31. Non-Isolated 4-20 Output Using Input Power Supply.......... 2-29
2-32. Isolated 4-20 Output Using Meter Power Supply (AC only) 2-29
2-33. Isolated Frequency Output Using External Power Supply ... 2-30
2-34. Non-Isolated Frequency Output Using Input Power Supply 2-30
2-35. Isolated Freq. Out. Using Meter Power Sup. (AC only)....... 2-30
2-36. Isolated Pulse Output Using External Power Supply ........... 2-31
2-37. Non-Isolated Pulse Output Using Input Power Supply ........ 2-31
2-38. Isolated Pulse Output Using Meter Power Sup. (AC only) .. 2-31
2-39. Isolated Alarm Output Using External Power Supply.......... 2-32
2-40 Non-Isolated Alarm Output Using Meter Power Supply...... 2-32
2-41 Isolated Alarm Output Using Meter Power Sup. (AC only) 2-33
2-42 High Power Flow Meter Junction Box ................................ 2-33
2-43. Optional Energy EMS RTD Input Wiring............................ 2-34
2-44. External 4-20 mA Input Wiring –External Power Supply... 2-35
2-45. External 4-20 mA Input Wiring –DC Powered Meter......... 2-35
2-46. External 4-20 mA Input Wiring –AC Powered Meter......... 2-36
2-47. Optional External Contact Closure Input Wiring ................. 2-36
3-1. Flow Meter Display/Keypad................................................... 3-1
4-1. Loop Powered Meter Wiring (HART).................................... 4-1
4-2. DC Powered Meter Wiring (HART) ...................................... 4-2
4-3. AC Powered Meter Wiring (HART) ...................................... 4-2
4-4. RS-485 Wiring (MODBUS) ................................................... 4-9
5-1. Electronics Stack Sensor Connections.................................. 5-10
5-2. Remote Feed Through Board Sensor Connections............... 5-11
5-3. Vortex Sensor Connector...................................................... 5-11
5-4. Temperature Sensor Connector ............................................ 5-12
5-5. Pressure Sensor Connector ................................................... 5-13
Tables
4-1. Byte Order (MODBUS)........................................................ 4-11
4-2. Register Definitions (MODBUS) ......................................... 4-13

Table of Contents Series M22/M23/M24 Instruction Manual
0-8 M-000-00010
Warnings and Cautions
Warning!
Consult the flow meter nameplate for specific flow meter approvals before any hazardous
location installation.
Hot tapping must be performed by a trained professional. U.S. regulations often require a
hot tap permit. The manufacturer of the hot tap equipment and/or the contractor perform-
ing the hot tap is responsible for providing proof of such a permit.
All flow meter connections, isolation valves and fittings for cold/hot tapping must have the
same or higher pressure rating as the main pipeline.
For Series M23 insertion flow meter installations, an insertion tool must be used for any
installation where a flow meter is inserted under pressure greater than 50 psig.
To avoid serious injury, DO NOT loosen a compression fitting under pressure.
To avoid potential electric shock, follow National Electric Code or your local code when
wiring this unit to a power source. Failure to do so could result in injury or death. All AC
power connections must be in accordance with published CE directives. All wiring proce-
dures must be performed with the power Off.
Before attempting any flow meter repair, verify that the line is not pressurized. Always
remove main power before disassembling any part of the mass flow meter.
Caution!
Calibration must be performed by qualified personnel. VorTek Instruments, Inc., strongly
recommends that you return your flow meter to the factory for calibration.
In order to achieve accurate and repeatable performance, the flow meter must be in-
stalled with the specified minimum length of straight pipe upstream and downstream of
the flow meter’s sensor head.
When using toxic or corrosive gases, purge the line with inert gas for a minimum of four
hours at full gas flow before installing the flow meter.
For Series M23 insertion flow meter installations, the sensor alignment pointer must point
downstream in the direction of flow.
The AC wire insulation temperature rating must meet or exceed 85°C (185°F)

Series M22/M23/M24 Instruction Manual Table of Contents
M-000-00010 0-9
Revision History
Rev. 2/2018 to 8/2018
Page Change Description
0-2 Changed Model M22 Pro-VTM Multivariable Mass Vortex Flowmeters to
Pro-VTM Multivariable Mass Vortex Flowmeters
2-37 Added Figure 2-47 External 4-20 mA Input and RTD Wiring –Loop
Power
2-38 Added Figure 2-48 External 4-20 mA Input and RTD Wiring –High
Power
2-38 Added Figure 2-49 Energy EMS External 4-20 mA Input and RTD Wir-
ing –High Power
2-39 Changed the title of Figure 2-47 to Figure 2-50
A-3 Changed PN64 to PN63
A-4 Changed PN64 to PN63
A-5 Changed PN64 to PN63
A-7 Changed PN64 to PN63
A-10 Changed C64 to C63 and P64R to P63R
A-10 Changed PN64 to PN63

Table of Contents Series M22/M23/M24 Instruction Manual
0-10 M-000-00010

Series M22/M23/M24 Instruction Manual Chapter 1 Introduction
M-000-00010 1-1
Chapter 1 Introduction
Pro-V™Multi-Parameter Vortex Mass Flow Meters
The VorTek Instruments’ Series M22/M24 In-Line and the Series M23
Insertion Pro-V™ Vortex Flow Meters provide a reliable solution for
process flow measurement. From a single entry point in the pipeline,
Pro-V meters offer precise measurements of mass or volumetric flow
rates.
Multi-Parameter Mass Flow Meters
Mass flow meters utilize three primary sensing elements: a vortex shed-
ding velocity sensor, an RTD temperature sensor, and a solid state pres-
sure sensor to measure the mass flow rate of gases, liquids, and steam.
Meters are available as loop powered devices or with up to three 4-20
mA analog output signals for monitoring your choice of the five process
variables (mass flow, volumetric flow, temperature, pressure and fluid
density). The Energy Monitoring option permits real-time calculation of
energy consumption for a facility or process.
Volumetric Flow Meters
The primary sensing element of a volumetric flow meter is a vortex
shedding velocity sensor. Meters are loop powered. The analog 4-20
mA output signal offers your choice of volumetric or mass flow rate.
Mass flow rate is based on a constant value for fluid density stored in the
instrument’s memory.
Both the mass and volumetric flow meters can be ordered with a local
keypad/display which provides instantaneous flow rate, total, and process
parameters in engineering units. A pulse output signal for remote totali-
zation and MODBUS, HART, or BACnet communications are also
available. Pro-V digital electronics allows for easy reconfiguration for
most gases, liquids and steam. The VorTek Series M22, M23, and M24
Pro-V Meters’ simple installation combines with an easy-to-use interface
that provides quick set up, long term reliability and accurate mass flow
measurement over a wide range of flows, pressures and temperatures.
Using This Manual
This manual provides information needed to install and operate both the
Series M22/M24 In-Line and Series M23 Insertion Pro-V Flow Meters.
•Chapter 1 includes the introduction and product description
•Chapter 2 provides information needed for installation
•Chapter 3 describes system operation and programming
•Chapter 4 information on HART, MODBUS, and BACnet protocols
•Chapter 5 covers troubleshooting and repair
Appendix A - Product Specifications, Appendix B –Approvals,
Appendix C –Flow Meter Calculations, Appendix D –Glossary of
Terms

Chapter 1 Introduction Series M22/M23 Instruction Manual
1-2 M-000-00010
Note and Safety Information
We use note, caution and warning statements throughout this book to
draw your attention to important information.
Warning!
Caution!
Note
This statement appears with
information that is important to
protect people and equipment
from damage. Pay very close
attention to all warnings that
apply to your application.
This statement appears with
information that is important
for protecting your equipment
and performance. Read and
follow all cautions that apply
to your application.
This statement appears with
a short message to alert you
to an important detail.
Receipt of System Components
When receiving a VorTek mass flow meter, carefully check the outside
packing carton for damage incurred in shipment. If the carton is dam-
aged, notify the local carrier and submit a report to the factory or distrib-
utor. Remove the packing slip and check that all ordered components are
present. Make sure any spare parts or accessories are not discarded with
the packing material. Do not return any equipment to the factory without
first contacting VorTek Customer Service.
Technical Assistance
If you encounter a problem with your flow meter, review the configura-
tion information for each step of the installation, operation and set up pro-
cedures. Verify that your settings and adjustments are consistent with fac-
tory recommendations. Refer to Chapter 5, Troubleshooting, for specific
information and recommendations.
If the problem persists after following the troubleshooting procedures
outlined in Chapter 5, contact VorTek Instruments, Technical Support
Via Email at [e-mail] or by phone at [phone] or
[phone] between 8:00 a.m. and 5:00 p.m. MST. When calling
Technical Support, have the following information on hand:
•the serial number and VorTek order number (all marked on
the meter nameplate)
•the problem you are encountering and any corrective action
taken
•application information (fluid, pressure, temperature and
piping configuration)

Series M22/M23/M24 Instruction Manual Chapter 1 Introduction
M-000-00010 1-3
How the Pro-V Vortex Mass Flow Meter Operates
Figure 1-1. In-Line Vortex Multi-Parameter Mass Flow Meter
VorTek Series M22, M23, and M24 Pro-V™ Multi-Parameter Vortex
Mass Flow Meters use a unique sensor head to monitor mass flow rate by
directly measuring three variables–fluid velocity, temperature and pres-
sure. The built-in flow computer calculates the mass flow rate and volu-
metric flow rate based on these three direct measurements. The velocity,
temperature and pressure sensing head is built into the vortex meter’s
flow body. To measure fluid velocity, the flow meter incorporates a bluff
body (shedder bar) in the flow stream and measures the frequency of vor-
tices created by the shedder bar. Temperature is measured using a plati-
num resistance temperature detector (PRTD). Pressure measurement is
achieved using a solid-state pressure transducer. All three elements are
combined into an integrated sensor head assembly located downstream
of the shedder bar within the flow body.
Velocity Measurement
The Pro-V vortex velocity sensor is a patented mechanical design that
minimizes the effects of pipeline vibration and pump noise, both of which
are common error sources in flow measurement with vortex flow meters.
The velocity measurement is based on the well-known Von Karman vor-
tex shedding phenomenon. Vortices are shed from a shedder bar, and the
vortex velocity sensor located downstream of the shedder bar senses the
passage of these vortices. This method of velocity measurement has many
advantages including inherent linearity, high turndown, reliability and
simplicity.

Chapter 1 Introduction Series M22/M23 Instruction Manual
1-4 M-000-00010
Vortex Shedding Frequency
Von Karman vortices form downstream of a shedder bar into two distinct
wakes. The vortices of one wake rotate clockwise while those of the oth-
er wake rotate counterclockwise. Vortices generate one at a time, alter-
nating from the left side to the right side of the shedder bar. Vortices in-
teract with their surrounding space by over-powering every other nearby
swirl on the verge of development. Close to the shedder bar, the distance
(or wave length) between vortices is always constant and measurable.
Therefore, the volume encompassed by each vortex remains constant, as
shown below. By sensing the number of vortices passing by the velocity
sensor, the Pro-V™ Flow Meter computes the total fluid volume.
Figure 1-2. Measurement Principle of Vortex Flow Meters
Vortex Frequency Sensing
The velocity sensor incorporates a piezoelectric element that senses the
vortex frequency. This element detects the alternating lift forces pro-
duced by the Von Karman vortices flowing downstream of the vortex
shedder bar. The alternating electric charge generated by the piezoelec-
tric element is processed by the transmitter’s electronic circuit to obtain
the vortex shedding frequency. The piezoelectric element is highly sensi-
tive and operates over a wide range of flows, pressures and temperatures.

Series M22/M23/M24 Instruction Manual Chapter 1 Introduction
M-000-00010 1-5
Re =
V D

Flow Velocity Range
To ensure trouble-free operation, vortex flow meters must be correctly
sized so that the flow velocity range through the meter lies within the
measurable velocity range (with acceptable pressure drop) and the linear
range.
The measurable range is defined by the minimum and maximum velocity
using the following table.
Gas
Liquid
Vmin
25

ft/s
1 ft/s
English  (lb/ft3)
Vmax
0.5 in
0.75 in
1 in
1.5 in and
greater
175 ft/s
250 ft/s
250 ft/s
300 ft/s
30 ft/s
30 ft/s
30 ft/s
30 ft/s
Vmin
37

m/s
0.3 m/s
Metric  (kg/m3)
Vmax
DN15
DN20
DN25
DN40 and
greater
53 m/s
76 m/s
76 m/s
91 m/s
9.1 m/s
9.1 m/s
9.1 m/s
9.1 m/s
The linear range is defined by the Reynolds number. The Reynolds number is the
ratio of the inertial forces to the viscous forces in a flowing fluid and is defined
as:
Where
Re = Reynolds Number
= mass density of the fluid being measured
V = velocity of the fluid being measured
D = internal diameter of the flow channel
= viscosity of the fluid being measured

Chapter 1 Introduction Series M22/M23 Instruction Manual
1-6 M-000-00010
The Strouhal number is the other dimensionless number that quantifies the vortex
phenomenon. The Strouhal number is defined as:
St = f d
V
Where
St = Strouhal Number
f = frequency of vortex shedding
d = shedder bar width
V = fluid velocity
As shown in Figure 1-3, Pro-V™ meters exhibit a constant Strouhal number
across a large range of Reynolds numbers, indicating a consistent linear output
over a wide range of flows and fluid types. Below this linear range, the intelligent
electronics in Pro-V automatically corrects for the variation in the Strouhal num-
ber with the Reynolds number. The meter’s smart electronics corrects for this
non-linearity via its simultaneous measurements of the process fluid temperature
and pressure. This data is then used to calculate the Reynolds number in real
time. Pro-V meters automatically correct down to a Reynolds number of 5,000.
Figure 1-3. Reynolds Number Range for the Pro-V
Pressure Drop
The pressure drop for series M23 insertion meters is negligible. The pressure drop
for series M22/M24 in-line meters is defined as:
P = .00024 V2 English units (P in psi, in lb/ft3, V in ft/sec)
P = .000011 V2 Metric units (P in bar, in kg/m3, V in m/sec)
Minimum Back Pressure
A minimum back pressure is required to prevent cavitation in the vortex
flow meter when installed in liquid applications. Cavitation is a phenom-
enon wherein a liquid passing through a low pressure zone no longer can
remain in the liquid phase and therefore partially flashes (or “boils”) into
0.3
0.2
0.1
0.0 3 4
10
Linear range
Reynolds Number, Re
Strouhal Number, St
10 5 10 108 106107
5000
Corrected range

Series M22/M23/M24 Instruction Manual Chapter 1 Introduction
M-000-00010 1-7
its vapor phase. The resulting two-phase flow degrades the liquid calibra-
tion accuracy. For some applications, a valve downstream of the flow me-
ter may be required to increase the pressure in the meter, thereby avoiding
cavitation. The following equation defines the minimum back pressure to
prevent cavitation.
P = 2.9 P + 1.3 PV
Where:
P = Minimum line pressure five pipe diameters downstream of the flow
meter required to avoid cavitation (psia or bara).
P = Permanent pressure loss across the flow meter (psia or bara).
PV= Liquid vapor pressure at actual flowing conditions (psia or bara).
Temperature Measurement
Pro-V Flow Meters use a 1000 ohm platinum resistance temperature detec-
tor (PRTD) to measure fluid temperature.
Pressure Measurement
Pro-V Flow Meters incorporate a solid-state pressure transducer isolated
by a 316 stainless steel diaphragm. The transducer itself is micro-
machined silicon, fabricated using integrated circuit processing technol-
ogy. A nine-point pressure/temperature calibration is performed on every
sensor. Digital compensation allows these transducers to operate within a
0.3% of full scale accuracy band within the entire ambient temperature
range of -40°F to 140°F (-40 to 60°C). Thermal isolation of the pressure
transducer ensures the same accuracy across the allowable process fluid
temperature range of -330°F to 750°F (-200 to 400°C).

Chapter 1 Introduction Series M22/M23 Instruction Manual
1-8 M-000-00010
Flow Meter Configurations
Pro-V™ Vortex Mass Flow Meters are available in two model
configurations:
•Series M22/M24 in-line flow meter (replaces a section of the pipeline)
•Series M23 insertion flow meter (requires a “cold” tap or a “hot”
tap into an existing pipeline)
Both the in-line and insertion configurations are similar in that they both
use identical electronics and have similar sensor heads. Besides installa-
tion differences, the main difference between an in-line flow meter and
an insertion flow meter is their method of measurement.
For an in-line vortex flow meter, the shedder bar is located across the en-
tire diameter of the flow body. Thus, the entire pipeline flow is included
in the vortex formation and measurement. The sensing head, which di-
rectly measures velocity, temperature and pressure is located just down-
stream of the shedder bar.
Insertion vortex flow meters have a shedder bar located across the di-
ameter of a short tube. The velocity, temperature and pressure sensor are
located within this tube just downstream of a built-in shedder bar. This
entire assembly is called the insertion sensing head. It fits through any
entry port with a 1.875 inch minimum internal diameter.
The sensing head of an insertion vortex flow meter directly monitors the
velocity at a point in the cross-sectional area of a pipe, duct, or stack (re-
ferred to as “channels”). The velocity at a point in the pipe varies as a func-
tion of the Reynolds number. The insertion vortex flow meter computes the
Reynolds number and then computes the total flow rate in the channel. The
output signal of insertion meters is the total flow rate in the channel. The
accuracy of the total flow rate computation depends on adherence to the
piping installation requirements given in Chapter 2. If adherence to those
guidelines cannot be met, contact the factory for specific installation ad-
vice.
Multivariable Options
The M22, M23, or M24 models are available with the following options:
V, volumetric flowmeter; VT, velocity and temperature sensors; VTP,
velocity, temperature, and pressure sensors; VT-EM energy output op-
tions; VTP-EM, energy options with pressure; VT-EP, external pressure
transmitter input; VETEP, external RTD temperature input, external 4-20
mA input.

Series M22/M23/M24 Instruction Manual Chapter 1 Introduction
M-000-00010 1-9
Line Size / Process Connections / Materials
The M22/M24 In-line model is built for line sizes ½ through 4 inch wa-
fer or ½ through 12 inch flanged design using ANSI 150, 300, 600,
PN16, 40, or 64 class flanges. JIS flanges available upon request.
The M23 Insertion model can be used in line sizes 2 inch and greater and
is built with a compression fitting or packing gland design using 2 inch
NPT, or 2 inch flanged connections (ANSI 150, 300, 600, PN16, 40, or
64 class flanges). The packing gland design can be ordered with a per-
manent or removable retractor.
The M22/M24 In-line model can be built with A105 carbon steel, 316L
stainless steel, or Hastelloy C-276. The M23 Insertion model can be
built with 316L stainless steel or Hastelloy C-276.
Flow Meter Electronics
Pro-V Flow Meter electronics are available mounted directly to the flow
body, or remotely mounted. The electronics housing may be used indoors
or outdoors, including wet environments. Available input power options
are: DC loop powered (2-wire), DC powered, or AC powered. Three an-
alog output signals are available for your choice of three of the five pro-
cess variables: mass flow rate, volumetric flow rate, temperature, pres-
sure or fluid density. A pulse output signal for remote totalization and
MODBUS, HART, and BACnet communications are also available.
Pro-V Flow Meters include a local 2 x 16 character LCD display housed
within the enclosure. Local operation and reconfiguration is accom-
plished using six pushbuttons operated via finger touch. For hazardous
locations, the six buttons can be operated with the electronics enclosure
sealed using a hand-held magnet, thereby not compromising the integrity
of the hazardous location certification.
The electronics include nonvolatile memory that stores all configuration
information. The nonvolatile memory allows the flow meter to function
immediately upon power up, or after an interruption in power. All
flowmeters are calibrated and configured for the customer’s flow
application.

Chapter 1 Introduction Series M22/M23/M24 Instruction Manual
1-10 M-000-00010