Sierra 241-VT, 241-VTP, 240-VTP, 240-VT User Manual

Series 24-HP Instruction Manual Table of Contents

Sierra Series 240 and 241

Innova-Mass™ Multi-Parameter

Vortex Mass Flow Meters

Models 240-VT, 240-VTP, 241-VT, 241-VTP

Instruction Manual

Part Number: IM-24-HP, Rev. C 11/07

CORPORATE HEADQUARTERS

5 Harris Court, Building L, Monterey, CA 93940

Phone [phone] [phone] Fax [phone]

www.sierrainstruments.com

EUROPE HEADQUARTERS

Bijlmansweid 2 1934RE Egmond ann den Hoef The Netherlands

Phone [phone] Fax: [phone]

ASIA HEADQUARTERS

R.M.618, Tomson Centre, Building A

188 Zhang Yang Road,

Pu Dong New District, Shanghai, P.R. China 200122

Phone [phone] Fax [phone]

IM-24-HP 0-1

Table of Contents Series 24-HP Instruction Manual

Customer Notice

Unless you have specifically ordered Sierra’s optional O2 cleaning, this flow meter
may not be fit for oxygen service. Sierra Instruments, Inc., is not liable for any
damage or personal injury, whatsoever, resulting from the use of Sierra Instru­ments standard mass flow meters for oxygen gas. You are responsible for clean­ing the mass flow meter to the degree required for your oxygen flow application.

© COPYRIGHT SIERRA INSTRUMENTS 1997
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 Sierra Instruments. The information contained in
this manual is subject to change without notice.

TRADEMARKS
Innova-Mass™ is a trademark of Sierra Instruments, Inc. Other product and company
names listed in this manual are trademarks or trade names of their respective manufac­turers.

0-2 IM-24-HP

Series 24-HP Instruction Manual Table of Contents

Table of Contents

Chapter 1 Introduction

Innova-Mass™ 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 Innova-Mass Vortex Meter Operates.................................... 1-3

Velocity Measurement/Pressure Drop .......................................... 1-3

Temperature Measurement ........................................................... 1-6

Pressure Measurement .................................................................. 1-7

Flow Meter Configurations ................................................................. 1-7

Chapter 2 Installation

Installation Overview........................................................................... 2-1

Flow Meter Installation Requirements.......................................... 2-1

Unobstructed Flow Requirements................................................. 2-2

Series 240 In-Line Flow Meter Installation......................................... 2-3

Wafer-Style Flow Meter Installation ............................................ 2-4

Flange-Style Flow Meter Installation............................................ 2-5

Series 241 Insertion Flow Meter Installation ...................................... 2-6

Cold Tap Guidelines ..................................................................... 2-7

Hot Tap Guidelines ....................................................................... 2-8

Flow Meter Insertion ........................................................................... 2-9

Installing Meters with a Compression Connection ..................... 2-10

Installing Meters with a Packing Gland Connection .................. 2-12

Installing Meters (Packing Gland), No Insertion Tool ............... 2-15

Adjusting Meter Orientation.............................................................. 2-17

Display/Keypad Adjustment ....................................................... 2-17

Enclosure Adjustment ................................................................. 2-18

Wiring Connections........................................................................... 2-19

Input Power Connections ............................................................ 2-19

4-20 mA Output Connections ..................................................... 2-20

Pulse Output Connections........................................................... 2-21

Alarm Output Connections ......................................................... 2-22

Remote Electronics Wiring......................................................... 2-24

Optional Input Electronics Wiring.............................................. 2-25

Chapter 3 Operating Instructions

Flow Meter Display/Keypad ............................................................... 3-1

Start Up................................................................................................ 3-2

Using the Setup Menus........................................................................ 3-3

Programming the Flow Meter ....................................................... 3-3

Output Menu ................................................................................. 3-4

Display Menu................................................................................ 3-6

Alarms Menu................................................................................. 3-7

Totalizer Menu.............................................................................. 3-8

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Table of Contents Series 24-HP Instruction Manual

Energy Menu .......................................................................3-10

Fluid Menu.................................................................................. 3-11

Units Menu.................................................................................. 3-12

Time and Date Menu................................................................... 3-13

Diagnostics Menu........................................................................ 3-14

Calibration Menu ........................................................................ 3-15

Password Menu ........................................................................... 3-16

Chapter 4 Troubleshooting and Repair

Hidden Diagnostics Menus.................................................................. 4-1

Column One Hidden Diagnostics Values ..................................... 4-2

Column Two Hidden Diagnostics Values..................................... 4-3

Analog Output Calibration ................................................................. 4-5

Troubleshooting the Flow Meter ......................................................... 4-6

Symptom: Output at no Flow........................................................ 4-6

Symptom: Erratic Output .............................................................. 4-6

Symptom: No Output .................................................................... 4-7

Symptom: Meter Displays Temperature Fault.............................. 4-7

Symptom: Meter Displays Pressure Fault..................................... 4-8

Electronics Assembly Replacement .................................................... 4-9

Pressure Sensor Replacement (Series 240 Only) ............................... 4-9

Returning Equipment to the Factory.................................................. 4-10

Appendix A Product Specifications

Appendix B Glossary

Appendix C Fluid Calculations

Appendix D HART Communication

Appendix E Modbus Communication

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Series 24-HP Instruction Manual Table of Contents

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 Innova-Mass........................ 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................................................................... 2-8

2-6. Insertion Calculation (Compression Type) .......................... 2-10

2-7. Flow Meter with Compression Type Fitting ........................ 2-11

2-8. Insertion Calculation (Meters with Insertion Tool).............. 2-12

2-9. Flow Meter with Permanent Insertion Tool ......................... 2-13

2-10. Flow Meter with Removable Insertion Tool ........................ 2-14

2-11. Insertion Calculation (Meters without Insertion Tool)......... 2-15

2-12. Display/Keypad Viewing Adjustment.................................. 2-17

2-13. Enclosure Viewing Adjustment............................................ 2-18

2-14. AC Power Connections ........................................................ 2-19

2-15. DC Power Connections ........................................................ 2-19

2-16. Load Resistance Versus Input Voltage................................. 2-20

2-17. Isolated 4-20 Output with External Power Supply............... 2-20

2-18. Non-Isolated 4-20 Output using Input Power Supply .......... 2-21

2-19. Isolated 4-20 Output using Meter Power Supply (AC only) 2-21

2-20. Isolated Pulse Output using External Power Supply ............ 2-22

2-21. Non-Isolated Pulse Output using Input Power Supply......... 2-22

2-22. Isolated Pulse Output using Meter Power Supply (AC only)2-22

2-23. Isolated Alarm Output using External Power Supply .......... 2-23

2-24 Non-Isolated Alarm Output using Meter Power Supply ...... 2-23

2-25 Isolated Alarm Output using Meter Power Supply(AC only) 2-24

2-26 Remote Electronics Junction Box Sensor Wiring ................ 2-24

3-1. Flow Meter Display/Keypad .................................................. 3-1

Tables

2-1. Minimum Recommended Stud Bolt Lengths ......................... 2-3

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Table of Contents Series 24-HP Instruction Manual

Warnings and Cautions

Warning!

Agency approval for hazardous location installations varies between flow meter models.
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 perform­ing 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 241 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 proce­dures 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. Sierra 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 in­stalled 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 241 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).

0-6 IM-24-HP

Series 24-HP Instruction Manual Chapter 1 Introduction

Chapter 1 Introduction

Innova-Mass™ Multi-Parameter Vortex Mass Flow Meters

The Sierra Instruments’ Series 240 In-Line and the Series 241 Insertion
Innova-Mass™ Vortex Flow Meters provide a reliable solution for proc­ess flow measurement. From a single entry point in the pipeline, Innova­Mass meters offer precise measurements of five parameters including
mass flow, volumetric flow, temperature, pressure and fluid density. The
unique Innova-Mass design reduces fugitive emissions, wiring, startup
time and work-force requirements.

Innova-Mass digital electronics allows reconfiguration for most gases,
liquids and steam with generous rangeability. The meter outputs a pulse
signal for remote totalization and up to three 4-20 mA analog signals for
monitoring your choice of the five process variables. The local key­pad/display provides instantaneous flow rate, total flow, temperature,
pressure and density in engineering units.

The Sierra Series 240 and 241 Innova-Mass 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 240 In-Line and Series 241 Insertion Innova-Mass Flow Meters.
The four chapters of this manual cover these areas:

• Chapter 1 includes the introduction and product description

• Chapter 2 provides information needed for installation

• Chapter 3 describes system operation and programming

• Chapter 4 covers troubleshooting and repair

The product specifications are found in Appendix A. Appendix B con­tains a glossary of terms. Appendix C provides reference fluid calcula­tions. Appendix D provides wiring and configuration information for
the Energy meter option.

IM-24-HP 1-1

Chapter 1 Introduction Series 24-HP Instruction Manual

Note and Safety Information

We use note, caution and warning statements throughout this book to
draw your attention to important information.

Warning!

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.

Caution!

This statement appears with
information that is important
for protecting your equipment
and performance. Read and
follow all cautions that apply
to your application.

Receipt of System Components

When receiving a Sierra mass flow meter, carefully check the outside
packing carton for damage incurred in shipment. If the carton is dam­aged, notify the local carrier and submit a report to the factory or dis­tributor. 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 Sierra Customer Service.

Technical Assistance

If you encounter a problem with your flow meter, review the configura­tion information for each step of the installation, operation and set up
procedures. Verify that your settings and adjustments are consistent with
factory recommendations. Refer to Chapter 4, Troubleshooting, for spe­cific information and recommendations.

If the problem persists after following the troubleshooting procedures
outlined in Chapter 4, contact Sierra Instruments, Technical Support 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 flow range, serial number and Sierra order number (all

marked on the meter nameplate)

• the problem you are encountering and any corrective action

taken

• application information (gas, pressure, temperature and pip-

ing configuration)

Note

This statement appears with a
short message to alert you to
an important detail.

1-2 IM-24-HP

Series 24-HP Instruction Manual Chapter 1 Introduction

How the Innova-Mass Vortex Mass Flow Meter Operates

Figure 1-1. In-Line Vortex Multi-Parameter Mass Flow Meter

Sierra Series 240 and 241 Innova-Mass™ 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 pres­sure. The built-in flow computer calculates the mass flow rate and volu­metric 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
vortices created by the shedder bar. Temperature is measured using a
platinum 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 Innova-Mass 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 vortex 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.

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Chapter 1 Introduction Series 24-HP Instruction Manual

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 other wake rotate counterclockwise. Vortices generate one at a time,
alternating from the left side to the right side of the shedder bar. Vortices
interact 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 Innova-Mass™ Flow Meter computes the total fluid
volume.

Velocity sensor

Vortex shedder bar

Flow

Constant
wave length

Vortices

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 pro­duced by the Von Karman vortices flowing downstream of the vortex
shedder bar. The alternating electric charge generated by the piezoelec­tric element is processed by the transmitter’s electronic circuit to obtain
the vortex shedding frequency. The piezoelectric element is highly sensi­tive and operates over a wide range of flows, pressures and temperatures.

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Series 24-HP Instruction Manual Chapter 1 Introduction

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.

Vmin
Vmax 300 ft/s 30 ft/s

Vmin
Vmax 91 m/s 9.1 m/s

Gas Liquid

25

37

ft/s

ρ

m/s

ρ

1 ft/s

0.3 m/s

English ρ (lb/ft3)

Metric ρ (kg/m3)

The pressure drop for series 241 insertion meters is negligible. The pressure
drop for series 240 in-line meters is defined as:

∆P = .00024 ρ V
∆P = .000011 ρ V

2

English units (∆P in psi, ρ in lb/ft3, V in ft/sec)

2

Metric units (∆P in bar, ρ in kg/m3, V in m/sec)

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 =

ρ V D

µ

Re = Reynolds Number
ρ = mass density of the fluid being measured
V = velocity of the fluid being measured
D = internal diameter of the flow channel
µ = viscosity of the fluid being measured

The Strouhal number is the other dimensionless number that quantifies
the vortex phenomenon. The Strouhal number is defined as:

Where

St = Strouhal Number
f = frequency of vortex shedding
d = shedder bar width
V = fluid velocity

IM-24-HP 1-5

St =

f d

V

Chapter 1 Introduction Series 24-HP Instruction Manual

As shown in Figure 1-3, Innova-Mass™ 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 Innova-Mass automatically
corrects for the variation in the Strouhal number 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. Innova-Mass meters automatically correct down to a Reynolds
number of 5,000.

0.3

Corrected range

Linear range

0.2

0.1

Strouhal Number, St

0.0

3 4

10

10

5000

5

10 10

Reynolds Number, Re

10

6

10

7

8

Figure 1-3. Reynolds Number Range for the Innova-Mass

Temperature Measurement

Innova-Mass Flow Meters use a 1000 ohm platinum resistance temperature
detector (PRTD) to measure fluid temperature.

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Series 24-HP Instruction Manual Chapter 1 Introduction

Pressure Measurement

Innova-Mass 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 tech­nology. 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 -4°F to 140°F. Thermal isolation of the pressure trans­ducer ensures the same accuracy across the allowable process fluid tem­perature range of -40°F to 750°F.

Flow Meter Configurations

Innova-Mass™ Vortex Mass Flow Meters are available in two
configurations:

• Series 240 in-line flow meter (replaces a section of the pipeline)

• Series 241 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 installa­tion 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 en­tire diameter of the flow body. Thus, the entire pipeline flow is included
in the vortex formation and measurement. The sensing head, which di­rectly measures velocity, temperature and pressure is located just down­stream of the shedder bar.

Insertion vortex flow meters have a shedder bar located across the di­ameter 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 (re­ferred to as “channels”). The velocity at a point in the pipe varies as a
function 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 advice.

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Chapter 1 Introduction Series 24-HP Instruction Manual

Flow Meter Electronics

Innova-Mass 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. Power require­ments are 100 milliamps at 12-36 VDC. An optional AC powered unit is
available. Three analog output signals are available for your choice of
three of the five process variables: mass flow rate, volumetric flow rate,
temperature, pressure or fluid density.

Innova-Mass Flow Meters include a local 2 x 16 character LCD display
housed within the enclosure. Local operation and reconfiguration is ac­complished 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.

1-8 IM-24-HP

Series 24-HP Instruction Manual Chapter 2 Installation

Warning!

Consult the flow meter name-

plate for specific flow meter ap-

provals before any hazardous lo-

cation installation.

Chapter 2 Installation

Installation Overview

Sierra’s Innova-Mass Vortex Flow Meter installations are simple and
straightforward. Both the Series 240 In-Line and Series 241 Insertion type
flow meter installations are covered in this chapter. After reviewing the
installation requirements given below, see page 2-3 for Series 240 instal­lation instructions. See page 2-6 for Series 241 installation instructions.
Wiring instructions begin on page 2-19.

Flow Meter Installation Requirements

Before installing the flow meter, verify the installation site allows for
these considerations:

1. Line pressure and temperature will not exceed the flow meter

rating.

2. The location meets the required minimum number of pipe di-

ameters upstream and downstream of the sensor head as illus­trated Figure 2-1.

3. Safe and convenient access with adequate overhead clear-

ance for maintenance purposes.

4. Verify that the cable entry into the instrument meets the

specific standard required for hazardous area installations.

5. For remote installations, verify the supplied cable length is

sufficient to connect the flow meter sensor to the remote
electronics.

Also, before installation check your flow system for anomalies such as:

• leaks

• valves or restrictions in the flow path that could create distur-

bances in the flow profile that might cause unexpected flow rate
indications

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Chapter 2 Installation Series 24-HP Instruction Manual

Unobstructed Flow Requirements

Select an installation site that will minimize possible distortion in the
flow profile. Valves, elbows, control valves and other piping components
may cause flow disturbances. Check your specific piping condition
against the examples shown below. In order to achieve accurate and re­peatable performance install the flow meter using the recommended
number of straight run pipe diameters upstream and downstream of the
sensor.

Note: For liquid applications in vertical pipes, avoid installing with flow
in the downward direction because the pipe may not be full at all points.
Choose to install the meter with flow in the upward direction if possible.

A B

A B

C' C

Flow conditioner

Example 1.
One 90° elbow before meter

Flow meter

Example 4.
Reduction before meter

A B

A B

C'

C

Flow meter

C' C

Flow conditioner

(if used)

Example 2.
Two 90° elbows before meter in one plane

Example 5.
Expansion before meter

Flow conditioner

A B

A B

C'

C

Flow meter

Flow conditioner

(if used)

Example 3.
Two 90° elbows before meter out of plane (if three
90° bends present, double recommended length)

Example 6.
Regulator or valve partially closed before meter
(If valve is always wide open, base length
requirements on fitting directly preceding it)

C' C

Flow conditioner (if used)

Minimum Required

Upstream Diameters

No Flow

Conditioner

With Flow Conditioner

Example A A C C´ B B

1 10 D N/A N/A N/A 5 D 5 D
2 15 D 10 D 5 D 5 D 5 D 5 D
3 25 D 10 D 5 D 5 D 10 D 5 D
4 10 D 10 D 5 D 5 D 5 D 5 D
5 20 D 10 D 5 D 5 D 5 D 5 D
6 25 D 10 D 5 D 5 D 10 D 5 D

D = Internal diameter of channel. N/A = Not applicable

Minimum Required

Downstream Diameters

No Flow

Conditioner

Flow meter

(if used)

Flow meter

(if used)

Flow meter

With Flow

Conditioner

Figure 2-1. Recommended Pipe Length Requirements for Installation, Series 240 and 241

2-2 IM-24-HP

Series 24-HP Instruction Manual Chapter 2 Installation

Series 240 In-Line Flow Meter Installation

Install the Series 240 In-Line Flow Meter between two conventional pipe
flanges as shown in Figures 2-3 and 2-4. Table 2-1 provides the recom­mended minimum stud bolt lengths for wafer-style meter body size and
different flange ratings.

The meter inside diameter is equal to the same size nominal pipe ID in
schedule 80. For example, a 2” meter has an ID of 1.939” (2” schedule

80). Do not install the meter in a pipe with an inside diameter
smaller than the inside diameter of the meter. For schedule 160 and
higher pipe, a special meter is required. Consult the factory before pur­chasing the meter.

Series 240 Meters require customer-supplied gaskets. When selecting
gasket material make sure that it is compatible with the process fluid and
pressure ratings of the specific installation. Verify that the inside diame­ter of the gasket is larger than the inside diameter of the flow meter and
adjacent piping. If the gasket material extends into the flow stream, it will
disturb the flow and cause inaccurate measurements.

Flange Bolt Specifications

Stud Bolt Lengths for Each Flange Rating (inches)

Line Size Class 150 Class 300 Class 600

1 inch 6.00 7.00 7.50

1.5 inch 6.25 8.50 9.00
2 inch 8.50 8.75 9.50
3 inch 9.00 10.00 10.50
4 inch 9.50 10.75 12.25

Table 2-1. Minimum Recommended Stud Bolt Lengths for Wafer Meters

The required bolt load for sealing the gasket joint is affected by several
application-dependent factors, therefore the required torque for each ap­plication may be different. Refer to the ASME Pressure Vessel Code
guidelines for bolt tightening standards.

1

34

2

1

8

6

5

34

7

2

4

10

4-bolt 8-bolt 12-bolt

1

12

8

6

5

9

3

7

11

2

Figure 2-2. Flange Bolt Torquing Sequence

IM-24-HP 2-3

Chapter 2 Installation Series 24-HP Instruction Manual

Wafer-Style Flow Meter Installation

Install the wafer-style meter between two conventional pipe flanges of the
same nominal size as the flow meter. If the process fluid is a liquid, make
sure the meter is located where the pipe is always full. This may require
locating the meter at a low point in the piping system. Note: Vortex flow
meters are not suitable for two-phase flows (i.e., liquid and gas mixtures).
For horizontal pipelines having a process temperature above 300° F,
mount the meter at a 45 or 90-degree angle to avoid overheating the elec­tronics enclosure. To adjust the viewing angle of the enclosure or dis­play/keypad, see page 2-17.

Caution!

When using toxic or cor-

rosive gases, purge the

line with inert gas for a
minimum of four hours

at full gas flow before

installing the flow meter.

Figure 2-3. Wafer-Style Flow Meter Installation

When installing the meter make sure the section marked “inlet” is positioned
upstream of the outlet, facing the flow. This ensures that the sensor head is
positioned downstream of the vortex shedder bar and is correctly aligned to
the flow. Installing the meter opposite this direction will result in completely
inaccurate flow measurement. To install the meter:

1. Turn off the flow of process gas, liquid or steam. Verify that the line

is not pressurized. Confirm that the installation site meets the re­quired minimum upstream and downstream pipe diameters.

2. Insert the studs for the bottom side of the meter body between the pipe

flanges. Place the wafer-style meter body between the flanges with the
end stamped “inlet” facing flow. Center the meter body inside the di­ameter with respect to the inside diameter of the adjoining piping.

3. Position the gasket material between the mating surfaces. Make sure

both gaskets are smooth and even with no gasket material extending
into the flow profile. Obstructions in the pipeline will disturb the flow
and cause inaccurate measurements

4. Place the remaining studs between the pipe flanges. Tighten the nuts in

the sequence shown in Figure 2-2. Check for leaks after tightening the
flange bolts

2-4 IM-24-HP

Series 24-HP Instruction Manual Chapter 2 Installation

Flange-Style Flow Meter Installation

Install the flange-style meter between two conventional pipe flanges of
the same nominal size as the flow meter. If the process fluid is a liquid,
make sure the meter is located where the pipe is always full. This may re­quire locating the meter at a low point in the piping system. Note: Vortex
flow meters are not suitable for two-phase flows (i.e., liquid and gas mix­tures). For horizontal pipelines having a process temperature above 300°
F, mount the meter at a 45 or 90-degree angle to avoid overheating the
electronics enclosure. To adjust the viewing angle of the enclosure or dis­play/keypad, see page 2-17.

Caution!

When using toxic or corro-

sive gases, purge the line

with inert gas for a mini-

mum of four hours at full

gas flow before installing

the flow meter.

Figure 2-4. Flange-Style Flow Meter Installation

When installing the meter make sure the flange marked “inlet” is positioned
upstream of the outlet flange, facing the flow. This ensures that the sensor
head is positioned downstream of the vortex shedder bar and is correctly
aligned to the flow. Installing the meter opposite this direction will result in
completely inaccurate flow measurement. To install the meter:

1. Turn off the flow of process gas, liquid or steam. Verify that the line

is not pressurized. Confirm that the installation site meets the re­quired minimum upstream and downstream pipe diameters.

2. Seat the meter level and square on the mating connections with the flange

marked “inlet” facing the flow. Position a gasket in place for each side.
Make sure both gaskets are smooth and even with no gasket material ex­tending into the flow profile. Obstructions in the pipeline will disturb the
flow and cause inaccurate measurements.

3. Install bolts in both process connections. Tighten the nuts in the se-

quence shown in Figure 2-2. Check for leaks after tightening the flange
bolts.

IM-24-HP 2-5

Chapter 2 Installation Series 24-HP Instruction Manual

Series 241 Insertion Flow Meter Installation

Prepare the pipeline for installation using either a cold tap or hot tap
method described on the following pages. Refer to a standard code for all
pipe tapping operations. The following tapping instructions are general in
nature and intended for guideline purposes only. Before installing the me­ter, review the mounting position and isolation value requirements given
below.

Mounting Position

Allow clearance between the electronics enclosure top and any other ob­struction when the meter is fully retracted.

Isolation Valve Selection

An isolation valve is available as an option with Series 241 meters. If you
supply the isolation valve, it must meet the following requirements:

1. A minimum valve bore di-

ameter of 1.875 inches is re­quired, and the valve’s body
size should be two inches.

2-inch min.

Normally, gate valves are
used.

2. Verify that the valve’s body

2-inch

valve size

and flange rating are within
the flow meter’s maximum
operating pressure and tem-

Isolation Valve Requirements

perature.

3. Choose an isolation valve with at least two inches existing between

the flange face and the gate portion of the valve. This ensures that the
flow meter’s sensor head will not interfere with the operation of the
isolation valve.

1.875-inch min.
valve bore

2-6 IM-24-HP

Series 24-HP Instruction Manual Chapter 2 Installation

Caution!

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.

Warning!

All flow meter connec-

tions, isolation valves

and fittings for cold tap-

ping must have the same

or higher pressure rating

as the main pipeline.

Cold Tap Guidelines

Refer to a standard code for all pipe tapping operations. The following
tapping instructions are general in nature and intended for guideline pur­poses only.

1. Turn off the flow of process gas, liquid or steam. Verify that the line

is not pressurized.

2. Confirm that the installation site meets the minimum upstream and

downstream pipe diameter requirements. See Figure 2-1.

3. Use a cutting torch or sharp cutting tool to tap into the pipe. The pipe

opening must be at least 1.875 inches in diameter. (Do not attempt to
insert the sensor probe through a smaller hole.)

4. Remove all burrs from the tap. Rough edges may cause flow profile

distortions that could affect flow meter accuracy. Also, obstructions
could damage the sensor assembly when inserting into the pipe.

5. After cutting, measure the thickness of the cut-out and record this

number for calculating the insertion depth.

6. Weld the flow meter pipe con-

nection on the pipe. Make sure
this connection is within ± 5°
perpendicular to the pipe cen­terline.

7. Install the isolation valve (if used).

8. When welding is complete and all fittings are installed, close the

isolation valve or cap the line. Run a static pressure check on the
welds. If pressure loss or leaks are detected, repair the joint and re­test.

9. Connect the meter to the pipe process connection.

10. Calculate the sensor probe insertion depth as described on the follow-

ing pages. Insert the sensor probe into the pipe.

IM-24-HP 2-7

Chapter 2 Installation Series 24-HP Instruction Manual

Warning!

Hot tapping must be

performed by a trained pro-

fessional. US. regulations of-

ten require a hot tap permit.
The manufacturer of the hot

tap equipment and/or the con-

tractor performing the hot tap

is responsible for providing

proof of such a permit.

Warning!

All flow meter connections,

isolation valves and fittings for

hot tapping must have the

same or higher pressure rat-

ing as the main pipeline.

Hot Tap Guidelines

Refer to a standard code for all pipe tapping operations. The following
tapping instructions are general in nature and intended for guideline pur­poses only.

1. Confirm that the installation site meets the minimum upstream and

downstream pipe diameter requirements.

2. Weld a two inch mounting adapter on the pipe. Make sure the mount-

ing adapter is within ± 5° perpendicular to the pipe centerline (see
previous page). The pipe opening must be at least 1.875 inches in di­ameter.

3. Connect a two inch process connection on the mounting adapter.

4. Connect an isolation valve on the process connection. The valve’s

full open bore must be at least 1.875 inches in diameter.

5. Hot tap the pipe.

6. Close the isolation valve. Run a static pressure check on the welds. If

pressure loss or leaks are detected, repair the joint and re-test.

7. Connect the flow meter to the isolation valve.

8. Calculate the sensor probe insertion depth as described on the follow-

ing pages. Insert the sensor probe assembly into the pipe.

Check upstream and
downstream piping
requirements

Weld mounting
adapter

Connect process
connection
(flange or NPT)

Connect
isolation valve

Hot tap pipe

FLOW

Test for leaks,
purge pipe

Connect meter to
valve, calculate
insertion depth,
install flow meter

Figure 2-5. Hot Tap Sequence

2-8 IM-24-HP

Series 24-HP Instruction Manual Chapter 2 Installation

Flow Meter Insertion

The sensor head must be properly positioned in the pipe. For this rea­son, it is important that insertion length calculations are carefully fol­lowed. A sensor probe inserted at the wrong depth in the pipe will result
in inaccurate readings.

Insertion flow meters are applicable to pipes 2 inch and larger. For pipe
sizes ten inches and smaller, the centerline of the meter’s sensing head is
located at the pipe’s centerline. For pipe sizes larger than ten inches, the
centerline of the sensing head is located in the pipe’s cross section five
inches from the inner wall of the pipe; i.e., its “wetted” depth from the
wall to the centerline of the sensing head is five inches.

Insertion flow meters are available in three probe lengths:

Standard Probe configuration is used with most flow meter process
connections. The length, S, of the stem is 29.47 inches.

Compact Probe configuration is used with compression fitting process
connections. The length, S, of the stem is 13.1 inches.

12-Inch Extended Probe configuration is used with exceptionally
lengthy flow meter process connections. The length, S, of the stem is

41.47 inches.

Warning!

An insertion tool must be

used for any installation

where a flow meter is

inserted under pressure

greater than 50 psig.

Use the Correct Insertion Formula

Depending on your flow meter’s process connection, use the applicable
insertion length formula and installation procedure as follows:

• Flow meters with a compression type connection (NPT or flanged)

follow the instructions beginning on page 2-10.

• Flow meters with a packing gland type connection (NPT or flanged)

configured with an insertion tool, follow the instructions beginning
on page 2-12.

• Flow meters with a packing gland type connection (NPT or

flanged) without an insertion tool, follow the instructions beginning
on page 2-15.

IM-24-HP 2-9

Chapter 2 Installation Series 24-HP Instruction Manual

Installing Flow Meters with a Compression Connection*

Use the following formula to determine insertion length for flow meters
(NPT and flanged) with a compression process connection. The installa­tion procedure is given on the next page.

Insertion Length Formula

I = S – F – R – t

Where:

I = Insertion length.
S = Stem length – the distance from the center of the sensor head to the base
of the enclosure adapter (S = 29.47 inches for standard probes; S = 13.1

inches for compact; S = 41.47 inches for 12-inch extended).
F = Distance from the raised face of the flange or top of NPT stem housing to
the outside of the pipe wall.
R = Pipe inside diameter ÷ 2 for pipes ten inches and smaller.
R = Five inches for pipe diameters larger than ten inches.
t = Thickness of the pipe wall. (Measure the disk cut-out from the tapping
procedure or check a piping handbook for thickness.)

Figure 2-6. Insertion Calculation (Compression Type)

Example:

To install a Series 241 meter with a standard probe (S = 29.47 inches) into a 14

inch schedule 40 pipe, the following measurements are taken:

F=3 inches
R=5 inches
t=0.438 inches

The insertion length for this example is 21.03 inches. Insert the stem through
the fitting until an insertion length of 21.03 inches is measured with a ruler.

*All dimensions are in inches

2-10 IM-24-HP

Series 24-HP Instruction Manual Chapter 2 Installation

Insertion Procedure for Meters with a Compression Connection

Caution!

The sensor alignment

pointer must point

downstream, in the

direction of flow.

Warning!

To avoid serious injury,

DO NOT loosen the

compression fitting

under pressure.

Figure 2-7. Flow Meter with Compression Type Fitting

1. Calculate the required sensor probe insertion length.

2. Fully retract the stem until the sensor head is touching the bottom

of the stem housing. Slightly tighten the compression nut to prevent
slippage.

3. Bolt or screw the flow meter assembly into the process connection.

Use Teflon tape or pipe sealant to improve the seal and prevent seiz­ing on NPT styles.

4. Hold the meter securely while loosening the compression fitting.

Insert the sensor into the pipe until the calculated insertion length,
I, is measured between the base of the enclosure adapter and the top
of the stem housing, or to the raised face of the flanged version. Do
not force the stem into the pipe.

5. Align the sensor head using the sensor alignment pointer. Adjust the

alignment pointer parallel to the pipe and pointing downstream.

6. Tighten the compression fitting to lock the stem in position. When

the compression fitting is tightened, the position is permanent.

IM-24-HP 2-11

Chapter 2 Installation Series 24-HP Instruction Manual

Installing Flow Meters with a Packing Gland Connection*

Use the formula below to determine the insertion depth for flow meters
(NPT and flanged) equipped with an insertion tool. To install, see the
next page for instructions for meters with a permanent insertion tool. For
meters with a removable insertion tool, see page 2-14.

Insertion Length Formula

I = F + R + t – 1.35

Where:

I = Insertion length.

F = Distance from the raised face of the flange or

top of the process connection for NPT style
meters to the top outside of the process pipe.

R = Pipe inside diameter ÷ 2 for pipes ten inches &

smaller.

R = Five inches for pipe diameters larger than ten

inches.

t = Thickness of the pipe wall. (Measure the disk

cut-out from the tapping procedure or check a
piping handbook for thickness.)

Figure 2-8. Insertion Calculation (Meters with Insertion Tool)

Example 1: Flange Style Meters:

To install a Series 241 Flow Meter into a 14 inch schedule 40 pipe, the fol­lowing measurements are taken:

F = 12 inches
R = 5 inches
t = 0.438 inches

The example insertion length is 16.09 inches.

Example 2: NPT Style Meters:

The length of thread engagement on the NPT style meters is also subtracted in
the equation. The length of the threaded portion of the NPT meter is 1.18
inches. Measure the thread portion still showing after the installation and sub­tract that amount from 1.18 inches. This gives you the thread engagement
length. If this cannot be measured use .55 inch for this amount.

F = 12 inches
R = 5 inches
t = 0.438 inches

The example insertion length is 15.54 inches.

*All dimensions are in inches.

2-12 IM-24-HP

Series 24-HP Instruction Manual Chapter 2 Installation

Insertion Procedure for Flow Meters with Permanent Insertion Tool

Caution!

The sensor alignment

pointer must point

downstream, in the

direction of flow.

Note

If line pressure is above
500 psig, it could require
up to 25 ft lb of torque to

insert the flow meter.

Do not confuse this with

possible interference

in the pipe.

Figure 2-9. Flow Meter with Permanent Insertion Tool

1. Calculate the required sensor probe insertion length (see previous

page). Measure from the depth marker arrow down the stanchion and
scribe a mark at the calculated insertion depth.

2. Fully retract the flow meter until the sensor head is touching the bot-

tom of the stem housing. Attach the meter assembly to the two inch
full-port isolation valve, if used. Use Teflon tape or pipe sealant to
improve seal and prevent seizing on NPT style.

3. Loosen the two packing gland nuts on the stem housing of the meter.

Loosen the stem lock bolt adjacent to the sensor alignment pointer.
Align the sensor head using the sensor alignment pointer. Adjust the
alignment pointer parallel to the pipe and pointing downstream. Tighten
the stem lock bolt to secure the sensor position.

4. Slowly open the isolation valve to the full open position. If necessary,

slightly tighten the two packing gland nuts to reduce the leakage
around the stem.

5. Turn the insertion tool handle clockwise to insert the sensor head into

the pipe. Continue until the top of the upper retractor bracket aligns
with the insertion length position scribed on the stanchion. Do not
force the stem into the pipe.

6. Tighten the packing gland nuts to stop leakage around the stem. Do

not torque over 20 ft-lb.

IM-24-HP 2-13

Chapter 2 Installation Series 24-HP Instruction Manual

Caution!

The sensor alignment

pointer must point

downstream, in the

direction of flow.

Note

If line pressure is above
500 psig, it could require
up to 25 ft lb of torque to

insert the flow meter.

Do not confuse this with

possible interference

in the pipe.

Insertion Procedure for Flow Meters with Removable Insertion Tool

Figure 2-10. Flow Meter with Removable Insertion Tool

1. Calculate the required sensor probe insertion length. Measure from

the depth marker arrow down the stanchion and scribe a mark at the
calculated insertion depth.

2. Fully retract the flow meter until the sensor head is touching the bot-

tom of the stem housing. Attach the meter assembly to the two inch
full-port isolation valve, if used. Use Teflon tape or pipe sealant to
improve seal and prevent seizing on NPT style.

3. Remove the two top stem clamp nuts and loosen two stem clamp

bolts. Slide the stem clamp away to expose the packing gland nuts.

4. Loosen the two packing gland nuts. Loosen the stem lock bolt adja-

cent to the sensor alignment pointer. Align the sensor head using the
sensor alignment pointer. Adjust the alignment pointer parallel to the
pipe and pointing downstream. Tighten the stem lock bolt to secure
the sensor position.

5. Slowly open the isolation valve to the full open position. If necessary,

slightly tighten the two packing gland nuts to reduce the leakage
around the stem.

6. Turn the insertion tool handle clockwise to insert the stem into the

pipe. Continue until the top of the upper retractor bracket lines up
with the insertion length mark scribed on the stanchion. Do not force
the stem into the pipe.

2-14 IM-24-HP