Tek-Trol TEK-DP1620A User manual

Technology Solutions
T1620A
EK-DP
Instruction Manual
Cone Meter
Document Number: IM-1620A
www.tek-trol.com

© COPYRIGHT Tek-Trol LLC 2020
NOTICE
Read this manual before working with the product. For personal and system safety, and for optimum
product performance, make sure you thoroughly understand the contents before installing, using, or
maintaining this product.
For technical assistance, contact
Customer Support
796 Tek-Drive
Crystal Lake, IL 60014
USA
Tel: [phone]
www.tek-trol.com
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.
The information contained in this manual is subject to change without notice.

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Table of Contents
1Safety Instructions....................................................................................................................... 3
1.1 Intended Use ..................................................................................................................................... 3
1.2 Certifications ..................................................................................................................................... 3
1.3 Safety Instructions from the Manufacturer........................................................................................ 3
1.3.1 Disclaimer ........................................................................................................................................... 3
1.3.2 Product Liability and Warranty .......................................................................................................... 3
1.3.3 Information Concerning the Documentation..................................................................................... 3
1.4 Safety Precautions............................................................................................................................. 3
1.5 Packaging, Transportation and Storage.............................................................................................. 4
1.5.1 Packaging............................................................................................................................................ 4
1.5.2 Transportation.................................................................................................................................... 5
1.5.3 Storage ............................................................................................................................................... 5
1.5.4 Nameplate .......................................................................................................................................... 5
2Product Description.....................................................................................................................6
2.1 Introduction ...................................................................................................................................... 6
2.2 Usage and DP Applications ................................................................................................................ 6
2.3 Main Meter Components................................................................................................................... 6
2.4 Measuring Principle........................................................................................................................... 7
2.5 Operation.......................................................................................................................................... 8
2.6 System Components.......................................................................................................................... 9
2.6.1 Differential Pressure Transmitters ..................................................................................................... 9
2.6.2 Shut-Off Valves................................................................................................................................... 9
2.6.3 Valve Manifolds.................................................................................................................................. 9
2.6.4 Impulse Tubing Considerations ........................................................................................................ 10
2.6.5 Tubing Size Selection........................................................................................................................ 10
2.6.6 Process Tubing / Sensing Lines......................................................................................................... 10
2.6.7 Tubing Lengths and Configurations.................................................................................................. 10
2.7 Very High Temperature Applications ............................................................................................... 11
2.8 Very Cold Temperatures .................................................................................................................. 11
2.9 Best Practices for Installing the Tek-DPro Cone Meter ..................................................................... 12
2.10 Flow Run Requirements................................................................................................................... 12
2.11 Meter Orientation and Transmitter Position.................................................................................... 12
2.12 Pressure Tap Location...................................................................................................................... 12
2.13 For horizontal installations, the following installation guidelines apply: .......................................... 12
2.14 Points to check for the Transmitter / Meter Installation .................................................................. 13
2.15 Liquid Service Meter Installation ..................................................................................................... 13
2.15.1 Meter Orientation ............................................................................................................................ 13
2.15.2 Pipe Orientation ............................................................................................................................... 13
2.15.3 Wall Taps .......................................................................................................................................... 13
2.15.4 Condensate Chamber or Drip Pot .................................................................................................... 14
2.15.5 Horizontal Installation for Liquids .................................................................................................... 14
2.15.6 Vertical Installation for liquids ......................................................................................................... 14
2.15.7 Horizontal Meter Installation for Wet Gas....................................................................................... 15
2.16 Cone Meter Installation - Hot Gases / Steam ................................................................................... 16
2.16.1 Orientation ....................................................................................................................................... 16
2.16.2 Sensing /Impulse Tubing Orientation............................................................................................... 16

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2.16.3 Condensate Chambers ..................................................................................................................... 16
2.16.4 Horizontal Service Applications – Steam / Hot Gases ...................................................................... 16
2.17 Specifications .................................................................................................................................. 17
2.18 Transmitters or Flow Computers...................................................................................................... 18
2.19 Cone Meter Designs......................................................................................................................... 18
2.20 Process Connections ........................................................................................................................ 19
2.21 Dimensional Drawings ..................................................................................................................... 19
2.22 Model Charts................................................................................................................................... 21
3Installations............................................................................................................................... 24
3.1 General Instructions ........................................................................................................................ 25
3.1.1 Before installing a Tek-DP 1620A Cone Meter, review the following installation tips: ................... 25
3.2 Installation for Gases....................................................................................................................... 25
3.2.1 Horizontal Installation Gases............................................................................................................ 25
3.2.2 Vertical Installation Gases ................................................................................................................ 26
3.3 Installation for Liquids ..................................................................................................................... 26
3.3.1 Horizontal Installations Liquids ........................................................................................................ 26
3.3.2 Vertical Installations Liquids............................................................................................................. 27
3.4 Installations for Steam..................................................................................................................... 28
3.4.1 Horizontal Installation for Steam ..................................................................................................... 28
3.4.2 Vertical Installation for Steam.......................................................................................................... 28
3.5 Installation for Upstream and Downstream ..................................................................................... 29
4Maintenance ............................................................................................................................. 30
5Troubleshooting ........................................................................................................................ 31

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1Safety Instructions
1.1 Intended Use
Tek-DP 1620A Cone Meter is measures flow over a wide range of Reynolds numbers of gas, steam
and liquid applications.
1.2 Certifications
ISO 5167-5 Compliance.
1.3 Safety Instructions from the Manufacturer
1.3.1 Disclaimer
The manufacturer will not be held accountable for any damage that happens by using its product,
including, but not limited to direct, indirect, or incidental and consequential damages.
Any product purchased from the manufacturer is warranted in accordance with the relevant
product documentation and our Terms and Conditions of Sale.
The manufacturer has the right to modify the content of this document, including the disclaimer,
at any time for any reason without prior notice, and will not be answerable in any way for the
possible consequence of such changes.
1.3.2 Product Liability and Warranty
The operator shall bear authority for the suitability of the device for the specific application. The
manufacturer accepts no liability for the consequences of misuse by the operator. Wrong
installation or operation of the devices (systems) will cause the warranty to be void. The
respective Terms and Conditions of Sale, which forms the basis for the sales contract shall also
apply.
1.3.3 Information Concerning the Documentation
To prevent any injury to the operator or damage to the device it is essential to read the
information in this document and the applicable national standard safety instructions. This
operating manual contain all the information that is required in various stages, such as product
identification, incoming acceptance and storage, mounting, connection, operation and
commissioning, troubleshooting, maintenance, and disposal.
1.4 Safety Precautions
You must read these instructions carefully prior to installing and commissioning the device. These
instructions are an important part of the product and must be kept for future reference. Only by
observing these instructions, optimum protection of both personnel and the environment, as well
as safe and fault-free operation of the device can be ensured.
For additional information that are not discussed in this manual, contact the manufacturer.

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Warnings and Symbols Used
The following safety symbol marks are used in this operation manual and on the instrument.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in
death or severe injury
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury. It may also be used to alert against unsafe practices.
NOTE
Indicates that operating the hardware or software in this manner may damage it
or lead to system failure.
1.5 Packaging, Transportation and Storage
1.5.1 Packaging
The original package consists of
1. Tek-DP 1620A Cone Meter
2. Documentation Package NDT and Materials Certificates
NOTE
Unpack and Check the contents for damages or sign of rough handling. Report
damage to the manufacturer immediately. Check the contents against the packing
list provided.

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1.5.2 Transportation
•Avoid impact shocks to the device and prevent it from getting wet during
transportation.
•Verify local safety regulations, directives, and company procedures with respect to
hoisting, rigging, and transportation of heavy equipment.
•Transport the product to the installation site using the original manufacturer’s packing
whenever possible.
1.5.3 Storage
If this product is to be stored for a long period of time before installation, take the following
precautions:
•Store your product in the manufacturer’s original packing used for shipping.
•Storage location should conform to the following requirements:
1. Free from rain and water ingress
2. Free from vibration and impact shock
3. At room temperature with minimal temperature and humidity variation
•Properties of the instrument can change when stored outdoors (carbon steels).
1.5.4 Nameplate
The nameplate lists the order number and other important information, such as design details
and technical data.
NOTE
Check the device nameplate to ensure that the device is delivered according to your
order. Check for the correct Beta Ratio, Pipe ID, and TAG number if printed on the
nameplate. Flow Meter Coefficient of discharge (Cd
) is shown on the materials
certification / documentation for entry into a flow computer
MODEL:
SERIAL No.:
PIPE ID/SCH:
PIPE MATL.:
DESIGN PR.:
www.tek-trol.com
High TAG No.: Low
PO No.:
BETA:
CONE MATL.:
COFF. DIS.:
MODEL:
SERIAL No.:
PIPE ID/SCH:
PIPE MATL.:
DESIGN PR.:
www.tek-trol.com
High TAG No.: Low
PO No.:
BETA:
CONE MATL.:
COFF. DIS.:

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2Product Description
2.1 Introduction
Tek-DP 1620A Cone Meters are manufactured and designed for measuring multiple fluid types
from gases to liquids and vapors, the meter uses differential pressure to provide accurate,
repeatable and low cost of ownership measurement solutions.
All Tek-DP 1620A Cone Meters read flow rates by using by a differential pressure or multi-variable
transmitter in conjunction with a flow computer in certain world regions chart recorders are still
used which will operate with a cone meter.
The method used to connect the transmitter to the meter varies, depending on the type of product
measured and available space for mounting the meter in the supporting pipework. This operator
manual provides installation instructions and some piping diagrams for using the Cone Meter in
liquid, gas, and steam applications.
2.2 Usage and DP Applications
Tek-DP 1620A Cone Meters are fully capable and designed to work in both unprocessed and
processed applications, and are ideal for upstream, midstream and downstream flow
measurement applications that present large measurement challenges.
The Tek-DP 1620A Cone Meters is also available in many different configurations for low-pressure
coalbed/seam methane wellhead, High /low pressure separator, wet gas with Tek DPro validation
systems steam and other field applications, compressor anti-surge control, and fuel gas as detailed
within the company website.
2.3 Main Meter Components
The cone meter comprises three main components, as shown in Figure 1 & Figure 2.
i. Meter body or tube (closed conduit) with or without flanges
ii. Differential Pressure Cone assembly, either fabricated or machined from a mono-block
stainless/ other steel piece (not carbon) positioned in the center of the meter tube
iii. A pair of pressure tapping’s - wall tap upstream and a sensing tap downstream with a
pressure sensing conduit for reading differential pressures at the center of the cone and
meter body. (Note: a downstream wall-tap may be used under certain process
measurement conditions.)
All Tek-DP 1620A Cone Meters can be manufactured from various materials (Carbon-
A105/106/LF350 steels etc., stainless, or duplex stainless steel) to meet specific process
requirements for metering: natural gas steam, air, nitrogen, ethanol, digester gas and a host of
hydrocarbon and non-Hydrocarbon liquids from crude oil to wastewater and cryogenic products.
The Tek-DP 1620A Cone Meter is manufactured to meet the ISO 5167 Part 5 DP Cone Meter
Standard when applied for custody transfer applications the same dimensions and geometry is
used for other cone meter types with certain exceptions such as wall taps for vertical flow
orientations and extra taps for smart metering operations.

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Fig 1: Basic components of the Tek-DP 1620A Cone Meter
The Tek-DP 1620A Cone Meter has no moving parts, and is designed to ISO 5167 Part 5 Geometries.
There are no stagnation areas at the DP meter element where trash or fluid particles can lodge
within the measurement section during normal flowing conditions.
The meter is virtually maintenance-free due to the self-cleaning action at the cone beta edge which
resides downstream of the flow.
2.4 Measuring Principle
The Tek-DP 1620A Cone Meter generates a differential pressure across a centrally fixed cone shape
that can be used to calculate fluid flow rates using ISO 5167 Part 5 published equations.
A DP / MVT transmitter measures the differential pressure and outputs an integrated electronic
signal, typically via standard Modbus or a 4-20 mA output to a flow measurement computer with
cone meter equations installed, or other process control tertiary device for readout and review.
For compressible fluids (gasses), line pressure and temperature measurements are required for
accurate flow rate calculations such as custody transfer applications as well as compensation for
any adiabatic changes in the meter expansion factor also detailed in ISO 5167 Part 5. During normal
operation process fluids flow around the differential producer cone, and pressure drop occurs
according to Bernoulli principles of conservation of energy. The static line pressure (P1) is
measured via a wall tap strategically located upstream of the cone (Figure 2). Pressure is also
measured via a sensing tap that is connected to the cone center using a conduit and measures
pressure at a central point immediately downstream of the cone (P2). The fluid flow-rate is
calculated using the differential pressure (DP).
The principle of the conservation of mass and energy applies to cone meters thus, a flow rate Q is
proportional to the Square Root of the DP. The pipe area is based on the internal pipe diameter
and the area reduction being the annulus area at the cone beta edge. This relationship is called the
beta ratio (β) for DP Cone Meters this is calculated as being:
β= �1−d2
D2
Where, D is pipe Diameter.
d is Cone Diameter.
HP LP
DP Cone
Meter Body

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Fig 2: TEK-DP 1620A DP Cone Meter (Cutaway View – Flow Streams)
The meter differential producer cone element reshapes the fluid velocity profile directly upstream
and across the expanding element conditioning flows naturally and eliminating the need for
traditional flow conditioners or long straight lengths. Tek-DP 1620A Cone Meter can therefore be
installed in shorter meter runs than those required by a conventional differential pressure meter
and high degrees of performance are ensured even under extremely disturbed flow conditions.
2.5 Operation
All Tek-DPro DP Cone Meters are fabricated and assembled using ASME approved welding
techniques. Welder qualifications and material certification available to 3.lb and 3.lc quality
requirements with full material traceability either in standard steels or exotics.
Fig 3: TEK-DP 1620A DP Cone Meter
TEK-DPro Cone Meters are manufactured with attention to their geometry and metrology based
on ISO Standards. All up and downstream weld-neck seam welds are honed to provide smooth
entry & exit into and out of the cone meter measurement section.
This honing procedure minimizes fluid jetting effects entering the meter throat/annulus that may
occur at certain higher fluid ReDnumbers.

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NOTE
Jetting effects occur where weld beads protrude into the flow stream and may cause
an over-run of the flow conditioning effect provided by the meter DP element. This
effect is particularly evident on larger beta ratios, it is good practice to always
implement this operation in the manufacturing process of a cone meter
2.6 System Components
A transmitter, valve manifold, shut-off valves, and impulse tubing are typically required for the
operation of a Tek-DP 1620A Cone Meter. If the meter is used to measure steam, a condensate
pot may also be required.
2.6.1 Differential Pressure Transmitters
A differential pressure transmitter records the differential pressure signal generated by the cone
meter and provides an analog or serial output to a flow computer or data control system.
The transmitter(s) selected for an installation must be appropriate for operating conditions of
the process in terms of both accuracy and safety.
DP devices must be zeroed following installation. The procedure varies somewhat for liquid, gas,
and steam applications.
2.6.2 Shut-Off Valves
Choose a block valve that is rated for the operating pressure of the pipe in which it will be
installed. Where dangerous or corrosive fluids or gases like oxygen are likely, the block valve
and packing must provide ample protection.
NOTE
The valves must not affect the transmission of the differential pressure signal.
Install block valves next to the Tek-DP 1620A Cone Meter pressure taps. Never use a globe
valve for differential pressure transmission lines. (See: Figure 4)
Fig 4: Valve Connections
2.6.3 Valve Manifolds
A 3-way or 5-way valve manifold isolates the transmitter from the process lines (5-valve
manifolds are recommended). They allow the operator to calibrate the transmitter without
removing it from the impulse tubing, drain the transmitter and impulse tubing or vent it to
atmosphere. (See Figure 5)
Note: Some meters have rear gussets
installed which does not affect the performance.

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Fig 5: Valve Manifolds
NOTE
Valve manifolds must be oriented according to manufacturer’s instructions to
prevent trapping of air or liquid in the sensing lines and tubing. This can cause an
incorrect flow measurement condition.
2.6.4 Impulse Tubing Considerations
Before connecting impulse tubing between the Tek-DP 1620A Cone Meter and its transmitter,
consider the following installation advice for optimizing your system’s measurement accuracy.
“In a well- designed installation, fluids will drain freely from the process lines and gases will vent
to the atmosphere”.
2.6.5 Tubing Size Selection.
Impulse tubing that connects any Tek-DP 1620A Cone Meter tap holes to the transmitter have
diameters that change with service conditions. The bore should be no smaller than ¼” (6 mm) a
minimum diameter of 3/8” (10 mm) is recommended to allow for any condensate drainage and
also reduce plugging / freezing.
2.6.6 Process Tubing / Sensing Lines
The internal diameter (ID) must not exceed 1” (25 mm). For steam applications, the ID should
be in the range 3/8” (10 mm) to 1” (25 mm) depending on meter diameter.
The use of incorrect tubing both diameter and material selection can create a safety risk and the
cost incurred to regaining a process system control can be substantial. High reliability is required
for flow signals used in process safety management. A minimum tubing ID of 5/8” (16 mm) is
recommended for these types of industrial applications were possible. For high temperatures in
condensing vapor service, 1” (25 mm) is preferred.
2.6.7 Tubing Lengths and Configurations
For best performance, please try to meet the following recommendations for tubing length
and tubing orientation:
•Tubing lengths must be short enough to ensure a high degree of accuracy, and long enough
to ensure proper cooling of high-temperature fluids before they reach the transmitter.
•Make sure the installation permits access to impulse tubes, valves, valve manifolds, and
transmitters in case of maintenance and also emergency maintenance.

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•Limit the number of fittings and avoid long tubing sections, which can impair measurement
accuracy and increase the risk of plugging.
•Avoid changes in tubing elevation and fluid temperature if possible. Differences in elevation
will cause differences in hydrostatic pressure of liquid columns in process/sensing lines.
•Temperature differences may cause a difference between the density of the fluids in the
two sensing lines, which will change the amount of differential pressure measured. Both
can result in inaccurate differential pressure measurements. Fasten both process lines
together, if possible, to alleviate this type of issue.
•Install process lines so that they slope in only one direction (up or down). If piping must be
installed to slope in more than one direction, do not allow more than one bend and install
a liquid or gas trap, as applicable. A liquid trap should be installed at the lowest point in a
gas service installation. A gas trap should be installed at the highest point in a liquid service
installation.
2.7 Very High Temperature Applications
Steam vapor can reach 1500°F (815°C), which exceeds the temperature rating of standard DP and
pressure transmitters (200°F or 92°C Max). A condensate chamber / vessel can be used to isolate
the transmitter from extreme temperature effects. Alternatively, a long tube section can be
installed to allow the fluid to cool sufficiently before it reaches the transmitter.
As a general operational guideline when planning tubing lengths for temperature control, run a
horizontal tubing orientation where possible, and allow for a temperature drop of 100°F (37.8°C)
per foot (305 mm) of tubing.
NOTE
This is a rule of thumb guideline, the operator is still responsible for verification that
the temperature at the transmitter does not exceed the transmitter’s thermal rating
including the environmental conditions during operation.
2.8 Very Cold Temperatures
During cold temperature installations, thermal insulation and/or “heat tracing” of process lines
may be necessary this is required where liquids are present or the possibility of liquid drop out in
a gas stream that sustains a freeze temperature to cause the liquid to solidify and block the sensing
line. The amount of heat used to prevent these issues must be calculated carefully to also prevent
liquids from vaporizing and prevent condensable vapors from producing unwanted condensation
dual phase conditions. Fastening process lines together is highly recommended to help keep
process lines approximately at the same temperature. Providing temperature-controlled
environmental conditions for the transmitter also helps to ensure accurate metering in locations
where extreme temperature swings are likely (i.e., offshore platforms, desert installations or artic
circle regions).

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2.9 Best Practices for Installing the Tek-DPro Cone Meter
WARNING
Read the best practice recommendations below in their entirety before installation of
the Tek-DPro Cone Meter.
The basic steps for installing a Tek-DPro DP Cone Meter system are described as follows.
1. Install the meter in the meter run in accordance with the flow run requirements below.
2. Secure the manifold to the meter taps.
3. Connect the differential pressure transmitter to the manifold, observing the
recommended guidelines below for pressure measuring tubes.
4. Connect the transmitter to the flow computer according to instructions in the
transmitter user manual.
5. Zero the transmitter.
2.10 Flow Run Requirements
The Tek-DPro Cone Meter should be installed with zero to five pipe diameters of straight run
upstream of the meter and zero to three pipe diameters downstream. The meter can be used in
pipelines that are slightly larger than the meter tube; however, if the meter tube is larger than the
pipeline, operators should contact Tek-DPro for installation requirements. This is usually
determined before supply according to application and the degree of accuracy and performance
required.
2.11 Meter Orientation and Transmitter Position
The Tek-DPro Cone Meter can be installed in a horizontal or vertical position. The location of the
transmitter with respect to the meter should be based on the properties of the fluid or gas being
measured (gas, steam, liquid, etc.) and the direction of flow through the pipeline.
The direction of flow is clearly labeled on nameplate affixed to the body of every Tek-DPro Cone
Meter shipped. The meter must be installed so that the static pressure is always upstream of the
differential pressure tap.
2.12 Pressure Tap Location
Location of the static pressure and differential pressure taps will vary with the product flowing
through the pipeline (liquid, gas, or steam) and the orientation of the meter (vertical or horizontal).
2.13 For horizontal installations, the following installation guidelines apply:
•For measuring liquid, differential pressure taps should be located in the bottom half of the
pipeline, between 4 o’clock and 5 o’clock positions, or between 7 o’clock and 8 o’clock
positions.
•For measuring gas, differential pressure taps should be located in the top half of the pipeline.
For wet gas, taps should be located between the 10 o’clock and 2 o’clock positions to allow
proper drainage of liquids present.
•For steam, differential pressure taps should be located in the side of the pipeline.
Illustrations of typical piping configurations for liquid, gas, and steam are provided in figure 6.

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For additional installation information, refer to ISO 5167 various parts (part 5 cone meters) or
contact Tek-Trol etc.
Fig 6. Standard Port Location for Horizontal Installation
2.14 Points to check for the Transmitter / Meter Installation
Before putting the Tek-DPro Cone Meter into service, verify that the transmitter is installed
properly by reviewing the following checkpoints:
a. Is the transmitter full scale range correct?
b. Has the transmitter zero been checked and/or adjusted (dead weight tested)?
c. Has the transmitter and flow computer been set to the correct operating mode “linear or
square root”?
d. Have the sensing lines to the transmitter been purged cleaned / blown with nitrogen?
e. Are there any leaks in the sensing lines?
f. Is the manifold calibration cross valve closed?
g. Is the Tek-DPro Cone Meter high pressure port located upstream of the low-pressure port
and connected the correct way to the transmitter – negative flow may show if incorrectly
mounted?
2.15 Liquid Service Meter Installation
2.15.1 Meter Orientation
Tek-DPro Cone Meters can be installed both in a horizontal or vertical position.
Horizontal Installations are is the standard orientation, however where space is very limited, a
vertical position may prove to be the best option.
2.15.2 Pipe Orientation
The orientation of piping is dictated by the position of the meter, the type of product being
measured, and for vertical meter installations, the direction of flow. When a vertical piping
system is used, the operator must give special consideration to the piping configuration to
prevent gas from being trapped in liquid differential pressure lines.
2.15.3 Wall Taps
In extremely cold environments where there is a risk of product freezing in the process lines, the
low-pressure sensing port connected to the cone meter can become plugged with ice for such
installations, a downstream wall tap may be installed in the meter and should be used measure
the downstream differential pressure value. (Note this has to be installed during manufacturing
and selected as an option before supply).

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This option will allow ice /hydrate blockage to be removed without removing the meter from
the meter run, but the meter run must be isolated and depressurized before attempting to clean
out the blockage refer to earlier sections regarding this aspect.
2.15.4 Condensate Chamber or Drip Pot
Condensate chamber (drip pot) is a collection vessel recommended in certain standards to avoid
gas bubbles in liquid instrument tubing. It should be mounted at the highest point in the impulse
tubing between the cone meter and the DP transmitter.
2.15.5 Horizontal Installation for Liquids
For horizontal installations, pressure taps must be positioned at 30° to 60° below the horizontal
centerline (4 o'clock to 5 o'clock or 7 o'clock to 8 o'clock). Taps at the bottom of the pipe may
also become plugged with solids from the liquid; taps above the centerline can accumulate air
locks or non-condensing gases. For liquid service, the connecting sensing lines from the meter
to the transmitter shall slope downward towards the transmitter with no U bends or
opportunities for pockets. The minimum recommended slope for self-venting is 1 inch per foot
as from various national standards documentation.
Fig 7. Installation - Liquid measurement (Horizontal Cone Meter)
2.15.6 Vertical Installation for liquids
In most process applications, the operator should assume that some level of gas or vapor exists
in a liquid service, even if the liquid is water. As a result, the piping configuration must be
designed to allow gas to rise back into the flow stream. The process piping should be extended
horizontally a very short distance from the downstream tap and then sloped at a nominal 1-
inch-per-foot angle to the top of the manifold block. The manifold block should be mounted
horizontally below the upstream tap so that piping from the upstream tap to the manifold slopes
downward also.

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CAUTION
When a flowing condition is stopped, particulates may fall into the low-pressure port.
It is advisable to flush the low-pressure port with an inert fluid before starting the
meter, unless a wall tap design is being used. A wall tap design should always be used
on applications where trash may have a propensity to fall into the central low-pressure
port (Fig 1.0). Downward flow piping configurations that use the standard upstream
and downstream pressure ports are also not recommended for liquid applications due
to the risk of trapping gas. For such applications, consider the use of a vertically
oriented meter with two wall taps (Fig 2.0)
Fig 8: Installation suggestion for upward flowing condition - Cone Meter with Vertical Orientation
2.15.7 Horizontal Meter Installation for Wet Gas
The pressure taps on the Tek-DPro DP Cone Meter should be between the horizontal centerline
and the top of the pipe (3 o'clock to 12 o'clock or 9 o'clock to 12 o'clock). If the fluid is a "wet
gas" (i.e., a gas containing small quantities of liquids). The pressure taps should be situated in a
vertical position (12 o’clock) to allow all liquids to drain away from the transmitter (Figure 9). If
the connecting tubing extending from the cone meter to the transmitter is not installed in a
vertical position, it should slope upward (at least 1 inch per foot) to ensure proper drainage.
Fig 9: 12 o’ clock position (preferred) Fig 10: 3 o’ clock position
Fig 1.0
Fig 2.0
Short lengths preferred
to assist in reduction
of Gauge Line Error

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2.16 Cone Meter Installation - Hot Gases / Steam
The most difficult application for a differential pressure measurement is steam or hot gasses. This
installation requires careful consideration regarding the transmitter tubing. Steam /Hot Gases are
usually at a temperature which can damage a DP transmitter and may not be single phase due to
temperature change at the tubing due to various factors (Insulation failure, Joules Thompson
effects, Phase envelope etc.) Liquid or gaseous phases can ensue depending on both temperature
and pressure /environmental conditions. Differential pressure impulse tubing must be orientated
in such a manner that it can operate with a gas or liquid present which requires some initial review
of the intended install.
2.16.1 Orientation
All Tek-DPro Cone Meters can be installed in a horizontal or vertical position. Horizontal is the
standard orientation, however where space is very limited, a vertical position may prove to be
the best option taking into consideration the previous suggestions in earlier paragraphs.
2.16.2 Sensing /Impulse Tubing Orientation
The installation /position of the DP impulse tubing is determined by the orientation of the meter,
also the type and quality of the Steam/Hot Gas to be measured. For vertical meter installations,
the flow direction is also a factor. When a vertical meter run is to be used, operators/ system
designers should give special consideration to the impulse tubing configuration to prevent liquid
from being trapped and thus cause incorrect measurement readings.
2.16.3 Condensate Chambers
Condensate chambers are installed to provide a liquid reservoir / buffer that helps to prevent
super-heated steam from entering a differential pressure transmitter and causing overheating
of the electronics. In most cases, a large-diameter tee is only required to collect the liquid.
However, if the DP is being read by using a chart recorder, a larger volume condensate chamber
reservoir will be needed to prevent heat issues. Modern DP / smart transmitters have smaller
diaphragm movements and do not need large condensate chamber volumes.
2.16.4 Horizontal Service Applications – Steam / Hot Gases
The meter shall be installed so that the pressure taps shall be situated above the horizontal
centerline (9 o'clock to 3 o'clock only) of the meter. Condensing hot vapors from steam, cause
liquid fluids to form in impulse lines. The use of a condensate chamber is mandatory to prevent
hot process fluid from damaging the transmitter in this operating condition. The
impulse/sensing tubing should slope upwards from the cone meter to the condensate pots. As
mentioned, a condensate pot can be a tubing tee (Modern DP / smart transmitters) as shown in
Figure 11 or large size condensate chambers (for higher volume devices like chart recorders) as
shown in Figure 12. In either case, condensate pots should be situated at the same location /
level to enable differential pressure readings that are accurate. A line from the bottom of the
tee to the transmitter mounted below the tee should be filled to the point where any excess
fluid can drain back into the meter to help prevent build up.
In many cases, water (condensed steam) is used for this fluid fill. However, in cold weather, the
fluid must be protected from freezing as mentioned in an earlier section. The fluid fill
methodology requires a careful application with heat tracing and insulation to keep it in the

Instruction Manual
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liquid phase and to keep both the high-pressure and low-pressure legs of the tubing at the same
temperature (maintaining the liquid fill at the same density).
A liquid leg fill fluid other than base water should be used if practical. Methanol is a possible
substitute, but di-butyl phthalate is recommended by various users as a fill fluid because it is
immiscible with water and remains liquid throughout a broader range of temperatures than
some other fill components (i.e., -31 to 645oF)
Fig 11: Horizontal Application DP Transmitter
2.17 Specifications
Accuracy
±0.5% with Calibration
Repeatability
±0.1 % or better
Flow Ranges
10:1 and greater
Standard Beta Ratios
0.45 through 0.85
Special betas available
Instillation Piping Requirements
as per ISO S167-5. Typically, 0-3D upstream and 0-2D
downstream is required
Material
Inconel
Duplex
304 or 316 Stainless Steel
Hastelloy C-276
Carbon Steels
Other materials available on request
Line Sizes
2” to 48”
End Connections
Flanged
Threaded
Hub or weld-end standard
Others on request
Performance Verification Testing
ISO 5167-5
Fig 12: Horizontal Application
(Chart Recorder Typical Application)
Large Condensate Chambers
(Steam)

Instruction Manual
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Technology Solutions
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2.18 Transmitters or Flow Computers
2.19 Cone Meter Designs
•Precision Welded (Fixed Design)
1. Field Replaceable Top Entry
Fig 17: Precision Welded
Fig 18: Field Replaceable Top Entry
•Field Replaceable Body
Fig 19: Field Replaceable Body
•Tek-Bar 3110A Explosion Proof
Differential Pressure Transmitter
Fig 13: Tek-Bar 3110A Explosion Proof
Differential Pressure Transmitter
•Tek-Bar 3800E Multivariable Pressure
Transmitter
Fig 14: Tek-Bar 3800E Multivariable Pressure
Transmitter
•Tek-Bar 3800XH Multivariable Transmitter
•TEK-FC 8000A Flow Computers
Fig 15: Tek-Bar 3800XH Multivariable
Transmitter
Fig 16: Tek-FC 8000A Flow Computer