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1640A-0100-A-01-A-01-A-03-A-XX-A-01-A
User manual
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Table of contents
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Tek-Trol 1640A-0050-D-01-H-08-D-03-A-XX-A-01-A, 1640A-0050-A-01-H-08-A-03-A-XX-A-01-A, 1640A-0150-A-01-A-01-A-03-A-XX-A-01-A, 1640A-0080-A-01-H-08-A-03-A-XX-A-01-A, 1640A-0080-D-01-A-01-D-03-A-XX-A-01-A User manual

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Technology Solutions
EK-DP
T
1640A
Venturi Tube
Instruction Manual
Document Number: IM-1640A
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Instruction Manual
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1
Tek-DP 1640A
Table of Contents
1 Safety Instructions ..................................................................................................................... 2
1.1 Intended Use ...................................................................................................................................2
1.2 Certifications ...................................................................................................................................2
1.3 Safety Instructions from the Manufacturer .......................................................................................2
1.3.1 Disclaimer ............................................................................................................................................2
1.3.2 Product Liability and Warranty ...........................................................................................................2
1.3.3 Information Concerning the Documentation ......................................................................................2
1.4 Safety Precautions ...........................................................................................................................2
1.5 Packaging, Transportation and Storage ............................................................................................3
1.5.1 Packaging .............................................................................................................................................3
1.5.2 Transportation .....................................................................................................................................4
1.5.3 Storage ................................................................................................................................................4
1.5.4 Nameplate ...........................................................................................................................................4
2 Product Description ................................................................................................................... 5
2.1 Introduction ....................................................................................................................................5
2.2 Measuring Principle .........................................................................................................................5
2.3 Variants ...........................................................................................................................................6
2.3.1 Classical Venturi ..................................................................................................................................6
2.3.2 Venturi Nozzle .....................................................................................................................................6
2.4 Specifications ..................................................................................................................................7
2.5 Meter Type ......................................................................................................................................8
2.6 Model Chart ................................................................................................................................
....9
3 Installations ............................................................................................................................. 12
3.1 Mounting Options ......................................................................................................................... 12
3.2 Sealing Faces for Flanged Version ................................................................................................... 13
3.3 Pressure Tappings .......................................................................................................................... 13
3.4 Installation for Gases ..................................................................................................................... 14
3.4.1 Horizontal Installation Gases ............................................................................................................ 14
3.4.2 Vertical Installation Gases ................................................................................................................ 14
3.5 Installation for Liquids ................................................................................................................... 15
3.5.1 Horizontal Installations Liquids ........................................................................................................ 15
3.5.2 Vertical Installations Liquids ............................................................................................................. 16
3.6 Installations for Steam ................................................................................................................... 16
3.6.1 Horizontal Installation for Steam ..................................................................................................... 16
3.6.2 Vertical Installation for Steam .......................................................................................................... 17
3.7 Standard Port Location for Horizontal Installation .......................................................................... 18
3.8 Installation for Upstream and Downstream .................................................................................... 18
4 Maintenance ........................................................................................................................... 20
5 Troubleshooting ...................................................................................................................... 20
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Tek-DP 1640A

1 Safety Instructions

1.1 Intended Use

Tek-DP 1640A Venturi Tube is extensively used as a flow restriction in order to measure differential pressure in pipes and flow lines. This measurement is used to calculate volumetric flow.

1.2 Certifications

Tek-DP 1640A has UL, CE, NTEP, and HMO certification.

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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Indicates a potentially hazardous situation which, if not avoided, could result in
Indicates a potentially hazardous situation which, if not avoided, may result in
Indicates that operating the hardware or software in this manner may damage it
Unpack and Check the contents for damages or sign of rough handling. Report
list provided.
Tek-DP 1640A
Warnings and Symbols Used
The following safety symbol marks are used in this operation manual and on the instrument.
WARNING
death or severe injury
CAUTION
minor or moderate injury. It may also be used to alert against unsafe practices.
NOTE
or lead to system failure.

1.5 Packaging, Transportation and Storage

1.5.1 Packaging

The original package consists of
• Tek-DP 1640A Venturi Tube
• Documentation
NOTE
damage to the manufacturer immediately. Check the contents against the packing
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Check the device nameplate to ensure that the device is delivered according to
Tek-DP 1640A

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
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.

1.5.4 Nameplate

The nameplate lists the order number and other important information, such as design details and technical data.
NOTE
your order. Check for the correct supply voltage printed on the nameplate.
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Tek-DP 1640A

2 Product Description

2.1 Introduction

Venturi Tubes are differential pressure flow measurement devices particularly designed to measure non-viscous, clean liquids and gases. The prominent features of Venturi tubes include maximum pressure recovery, minimal upstream and downstream pipe length requirement. Tek-DP 1640A Venturi Tubes are available in various models for normal liquid applications and wet gas applications. Tek-DP 1640A series Venturi Tubes provide consistent accuracy, maximum pressure recovery and sustained performance for various applications where permanent pressure loss is intolerable.

2.2 Measuring Principle

A Venturi Tube is nothing but a tubular section with a constriction in it. It has a convergent nozzle section towards upstream and a divergent diffuser section towards downstream which is responsible for creating a Venturi effect in the flowing fluid. The Venturi Tube is placed inside the pipe or positioned between two flanges. It is ensured that the pipeline is completely filled with a fluid, while operating the device. A differential pressure sensor is attached between the two points, convergent and divergent sections, to determine the fluids' differential pressure.
Fig 1: Venturi Tube Cross-Section
The DP sensor measures the pressure of the fluid flow, upstream and downstream. The differential pressure (P1-P2) is proportional to the flow rate and can be determined by mathematical equations and appropriate calibration. Bernoulli described this relation between differential pressure and volumetric flow rate by a mathematical equation.
Where ρ is density of fluid. The differential pressure generated, ΔP, is proportional to the square of mass flow rate Qm. In simple terms, or a given size of restriction, higher the Δp, higher is the flow rate.
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Tek-DP 1640A

2.3 Variants

Tek-DP 1640A Venturi Tubes are available in various models for single phase gas, liquid applications, steam and wet gas application. The Tek-DP 1640A Venturi Tube is available in the following two configurations:

2.3.1 Classical Venturi

The convergent inlet is like a truncated Venturi Tube. The Classical Venturi is used in gas and fluid flow applications, where low pressure loss is a primary requirement and can prevent sediment clogging.

2.3.2 Venturi Nozzle

The convergent inlet matches with the structure of a flow nozzle. The Venturi nozzles are suitable in the measurement of superheated fluid, steam and gas, where the pressure gradient is below critical, and the flow pattern is steady.
Fig 2: Venturi Tubes
Fig 3: Venturi Nozzle
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Material
All standard materials available
Tap Connections
Two ½” NPT per side standard, Flanged,
Venturi Tube Sizes
1" to 48", Custom size available on order,
Turn Down Ratio
10:1 Standard
Beta Ratio
Typically, β 0.4 to 0.75
End Connection
#150 - #2500 RF/RTJ, SO/WN Flanges or
Operating Temperature
Standard at -20° to 100° F, optional -40° to
Operating Position
Vertical, horizontal, (any orientations for
Process products
Liquids, Liquid Hydrocarbons, Cryogenics
Assembly Type
Flange, Weld-In, Insertion type
Material
All standard materials available (See model
Tap Connections
Three 1⁄2" NPT standard, Flanged end,
Venturi Tube Sizes
1" to 48", Custom size available on order,
Turn Down Ratio
10:1 Standard
Beta Ratio
Typically, β 0.4 to 0.75
End Connection
#150 - #2500 RF/RTJ, SO/WN Flanges or
Operating Temperature
Standard at -20° to 100° F, optional -40° to
Operating Position
Vertical, Horizontal, Hydrocarbon Wet Gases,
Process products
Natural Gases, Steam
Assembly Type
Flange, Weld in, Insertion type
Tek-DP 1640A

2.4 Specifications

• Venturi Meter for normal Liquids
socket welded, Butt welded, Valves
Flanged, Socket Welded, Butt Welded Valves
Beveled ends
1200° F
liquids only)
• Venturi Meter for Wet Gases
chart)
Socket welded, Butt welded, Valves
Flange, Weld in, Insertion type
Beveled ends
1200° F
Steam, (other orientations available)
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Tek-DP 1640A

2.5 Meter Type

Fig 5: Flanged Type
Fig 6: Weld-In Type
Fig 7: Insertion Type
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Example
Tek-DP
0050
A
01 A 01 A 03 A 03 A 01 A MTR
Tek-DP 1640A-0050-A-01-
MTR
Series
Tek-DP 1640A
Venturi Tube
Size
0015
½”
0020
¾” 0025
1”
0040
1 ½”
0050
2” 0065
2 ½”
0080
3”
0100
4” 0150
6”
0200
8”
0250
10” 0300
12”
0350
14”
0400
16” 0450
18”
0500
20”
0600
24” 0700
28”
0800
32”
0900
36” 1200
48”
Meter Body
A Carbon Steel (Standard)
B Low Temp CS
C 304L SS
D 316L SS
E Duplex 2205
F Duplex 2507
G Chromemoly CrMo P11
H Chromemoly CrMo P22
X Special
Pipe
01
STD (Standard Pipe SCH)
02
10S 03
10
04
20
05
30 06
40S
07
40
08
80S 09
80
Tek-DP 1640A

2.6 Model Chart

1640A
A-01-A-03-A-03-A-01-A-
Schedule
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10
10
120 11
160
12
XS
13
XXS XX
Special
Process
A Raised Face Slip On
B Raised Face Weld Neck
C RTJ Slip On
D RTJ Weld Neck
E Hubs
F API
G Beveled End
H Socket
I NPTF (Upto 3” Only)
W Wafer Style (Upto 4” Only)
X Special
Pressure
01
150#
02
300#
03
600#
04
900#
05
1500#
06
2500#
07
NPT (3000#)
08
Socket
09
Beveled End
XX
Special
Throat
A Carbon Steel
B Low Temp CS
C 304L SS
D 316L SS
E Duplex 2205
F Duplex 2507
G Chromemoly CrMo P11
H Chromemoly CrMo P22
X Special
Pressure
01
¼”
02
3/8”
03
½”
04
¾”
05
1” XX
Special
Pressure Tap
A 3000psi NPT
B 6000psi NPT
C 3000psi Socket
D 6000psi Socket
F Flanged
H Hubs
Tek-DP 1640A
Connection
Rating
Material of Construction
Taps Size
Style
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V Valves
X Special
Beta
01
0.45
02
0.5 03
0.55
04
0.6
05
0.65
06
0.7
07
0.75
XX
Special
Additional
A Nones
B Temperature Tap (3D)
C Validation/Diagnostic Tap (6D)
X Special
Flow
01
None (Customer Supplied)
02
Tek-Bar 3110 (Liquids) ­Smart DP
03
Tek-Bar 3800 (MVT Steam & Compressed Gases)
04
Tek-FC 8000 (Natural Gas ­Flow Computer)
05
TekValsys DPRO (Insitu Flow Validation)
06
TekValsys DPRO WFGM (Wet Gas)
XX
Special
Calibration
A Dry (ISO 5167)
B Water
C Air D
Multiphase
X Special
Options
MTR
Material Test Report EN3.1
MC
Material Cert EN2.1
PMI
Positive Material Identification (NDE)
COC
Certificate of Conformity
HYD
Hydro Test
XRT
X-Ray
DPT
Dye Penetrant
MPT
Magnetic Particle Testing
O2C
O2 Cleaned
TAG
SS TAG PLATE
UMR
Upstream Meter Run - 1PC
DMR
Downstream Meter Run ­1PC
FMR
Meter Run with Flow Container Plates - 2PC
Tek-DP 1640A
Meter Taps (D/S)
Transmitters/ Computers
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CDE
Certfiied Drawing Electronic (As Built)
MRB
Manufacturing Record Book
DFT
Dry Film Thickness - Custom Paint Spec
CPC
Custom Product Code
• When removing the instrument from hazardous processes, avoid direct
All installation must comply with local installation requirements and local
Tek-DP 1640A

3 Installations

This section covers instructions on installation and commissioning. Installation of the device must be carried out by trained, qualified specialists authorized to perform such works.
CAUTION
contact with the fluid and the meter.
•
electrical code.

3.1 Mounting Options

Fig 8: Butt Weld Fig 9: Welding Neck Flange
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Tek-DP 1640A

3.2 Sealing Faces for Flanged Version

Fig 10: Raised face (RF) Fig 11: Ring joint (option)

3.3 Pressure Tappings

Fig 12: NPT Tap or Weld Stub Fig 13: Tap with Flangged Ends
Fig 14: Annular Chamber Tap with Welded Ring Fig 15: Annular Chamber Tap from Pipes
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Top View
Side View
3-Valve Manifold
3-Valve Manifold
DP Transm itter
or
Direct Rea d Ga ge
Smart Temperature
Transmit ter
HI LO
HI LO
Tek-DP 1640A

3.4 Installation for Gases

3.4.1 Horizontal Installation Gases

• The pressure taps on the primary device should be between the center of the horizontal line and the pipe (3 o’clock to 12 o’clock or 9 o’clock to 12 o’clock) shown in figure 16.
• The taps should be vertical to allow the liquids to drain away from the secondary device if the fluid is a “wet gas,” i.e., a gas containing small quantities of liquids.
• For gases, the connecting lines from the primary device to the secondary device should be slope upwards.
• The recommended slope for self-draining is a minimum of 30°.

3.4.2 Vertical Installation Gases

• Standard taps can be used in clean, dry, non-condensing gases, where no liquid or dirt can fill the Venturi Tube.
• The position of the transmitter is not critical.
• The transmission lines should be straight to the transmitter or horizontal and then up or
down to the transmitter.
Fig 16: Horizontal Installation for Gases
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Tek-DP 1640A

3.5 Installation for Liquids

3.5.1 Horizontal Installations Liquids

• The pressure taps should be between the center of the horizontal line and 60° below the centerline (3 o’clock to 5 o’clock or 7 o’clock to 9 o’clock) shown in figure 18.
• Taps at the bottom-dead-center may accumulate solids if they are present in the liquid and taps above the centerline will accumulate air or non-condensing gases.
• The taps should be more than 60° to the horizontal plane in any case.
Fig 17: Vertical Installation for Gases
Fig 18: Horizontal Installation for Liquids
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Tek-DP 1640A

3.5.2 Vertical Installations Liquids

• In most process applications, the presumption should be made that there may be gas or vapor associated with a liquid, even though the liquid is water.
• The piping must then allow gas to rise back into the flowing medium.
• The DP piping should be carried out horizontally for a short distance and then down to the
transmitter and the transmitter should be below both taps.
*Note: Wall taps must be used for dirty liquids. Standard taps should only be used on clean liquids.
Fig 19: Vertical Installations for Liquids

3.6 Installations for Steam

3.6.1 Horizontal Installation for Steam

• Steam applications require careful consideration during installation.
• Steam at a very high temperature can damage the transmitter. Additionally, it can be in the
liquid or gaseous phase, depending on temperature and pressure. Therefore, the DP pipework must be positioned in such a way that it can operate with a gas or liquid present.
• The pressure taps should be on the center of the horizontal line(3 o’clock or 9 o’clock ) of the primary device. In condensing hot vapor service, such as steam, the fluid in the impulse lines is liquid condensed from the vapor. In this case, the pressure taps should be horizontal with the impulse lines and positioned to the DP transmitter, as shown in figure 20.
• There is a concern that before the lines fill with condensed liquid and cool, the secondary system will become exposed to the vapor temperature at start-up. In this case, it is wise to have a plugged tee fit in the impulse line to allow the liquid (water for steam service) to be filled with the impulse line and secondary unit before starting up (see Figure 20).
• Cryogenic (very low temperature) systems may require special designs, which are not considered here.
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Tek-DP 1640A
• The liquids in the lines will isolate the secondary device from the temperatures of the primary flowing fluid.
• Over a short distance of 100 mm (4”) to 200 mm (8”), the temperature difference can be considerable.
Fig 20: Horizontal Installation for Steam

3.6.2 Vertical Installation for Steam

• Wall Taps are mostly recommended for condensing vapors, preventing condensation from the buildup in the Venturi Tube or evaporating and changing the DP.
• The impulse lines are shut down horizontally to a “T” at a minimum distance of 18” for saturated and superheated steam to reduce the temperature to below the saturation temperature.
• The “T” enables a plug to be installed at the top for the liquid filling to avoid overheating of the DP cell.
• The manifold block will be placed directly below at a distance to maintain the DP transmitter at a safe operating temperature.
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4 O’CLO CK TO 5 O ’CLOCK
OR
7 O’CLO CK TO 8 O ’CLOCK
LIQUID
10 O ’CLOCK TO 2 O’CLOCK
WET GA S
9 O’CLO CK TO 3 O ’CLOCK
DRY G AS
HORI ZON TAL TAPS ON LY
9 O’CLOCK OR 3 O ’CLO CK
STE AM
Tek-DP 1640A
Fig 21: Vertical Installation for Steam

3.7 Standard Port Location for Horizontal Installation

Fig 22: Standard Port Location for Horizontal Installation

3.8 Installation for Upstream and Downstream

• In most of the flow elements, the proper operation and performance depend on unrestricted upstream and downstream piping length requirements.
• The fully developed symmetrical flow profile is achieved with relatively short upstream and downstream lengths.
• Therefore, it needs minimal upstream and downstream straight pipe runs.
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0.4 0.5 0.6 0.7
UL 4 4 4 5
DL 2 2 2 2
UL 8 8 9 10
DL 3 3 3 3
UL 15 15 15 20
DL 4 4 4 4
UL 6 6 6
7
DL 2 2 2 2
UL 8 8 8 10
DL 3 3 3 3
UL 8 8 8 10
DL 3 3 3 3
UL 6 6 6 6
DL 3 3 3 3
UL 12 12 14 18
DL 3 3 3 3
Note: UL= Upst ream DL = Downstre am 0 = NR
Sin gle Elbow
UL
UL
UL
UL
1.5 To 3D
1D To 2D
2D
0.5D
UL
UL
UL
d or D
D
DL
DL
DL
DL
DL
DL
DL
Two Elb ows in the Same Plane
Reducer
Expander
Globe or Gate Valve Fully Op ened
Globe or Gate Valve Partially Opened
Tek-DP 1640A
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Symptoms
Area
Possible Problem or Solution
• No Power to transmitter.
• Check continuity on wiring or loose connection.
Negative Signal (<0mA)
Transmitter
• Transmitter wires are reversed.
• Venturi Tube is installed backwards, with gauge
4mA.
• Gauge lines are reversed. Transmitter shows
• Check “H” and “L” marks on Venturi Tube.
• Some transmitters will send a specified mA
high values, such as 20.1mA.
• Meter has been damaged.
have no flow.
• Manifold / gauge lines closed or blocked.
to verify pressure in the gauge lines.
• Transmitter is in check mode.
forcing the signal to 4 or 20mA.
Tek-DP 1640A

4 Maintenance

• Periodic maintenance or re-calibration is unnecessary if the meter is installed correctly.
• In extreme process conditions, periodically inspect the Tek-DP 1640A Venturi Tube for any
significant physical damage. Calibrate and maintain secondary and tertiary instruments according to the manufacturer’s
•
instructions.

5 Troubleshooting

This section provides troubleshooting techniques for most common operating problems shown in table 1.
Table 1: Troubleshooting Techniques
No Signal (0mA) Transmitter
Tek-DP 1640A
Low signal (<4 mA)
Gauge Line
Transmitter
Tek-DP 1640A
• Transmitter not wired correctly.
lines attached as marked.
n this case, the high-pressure tap would be
• I sensing a lower pressure than the low pressure tap.
his negative DP would force the signal below
• T
more pressure on lower side than higher side.
signal when a malfunction occurs.
his can be set to low values, such as 3.8mA, or
• T
• Remove and visually inspect meter.
• No flow in pipeline.
• Check other system locations to verify flow
through the meter.
he meter could be under pressure but still
• T
Zero Signal (4mA)
Manifold
Transmitter
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• Ensure valves and lines are open.
f fluid is safe, open vent valves on transmitter
• I
• Some transmitters allow for system checks by
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21
• Vent low side of transmitter to ensure the signal responds to pressure changes.
• Process conditions do not match actual
flow coefficient.
• Foreign material trapped in gauge lines. Dirt
o’clock).
• Flow calculations have an error.
signal directly.
Unsteady Signal
• Partially full pipe occurring (liquids only).
wrong readings. See above for details.
• Insufficient Power supply to generate signal.
Check power specifications for transmitter.
Slow response time
Transmitter
Dampening.
Sudden change in readings
• Foreign object lodged in meter.
and raise the DP.
Tek-DP 1640A
conditions.
ontact Tek-Trol or your sales representative to
• C recalculate using the correct process conditions.
Wrong Signal High or Low
Tek-DP 1640A
Gauge Lines
• Wrong meter.
• Verify serial numbers on meters to ensure
correct specifications.
ometimes two meters are interchanged.
• S Remember each Venturi Tube has a unique
and sediment can settle into the gauge lines. If the fluid is safe, vent the gauge lines and inspect for spurts of solids, gasses, or liquids (whichever should not be there).
• I
f the fluid is not safe, open the center manifold valve for several minutes under high DP. Close the valve and compare the signal level to before readings.
n a horizontal, liquid application, install the
• I meter with the taps on the sides of the pipe (3 or 9 o’clock). For a horizontal, gas application, install at top or sides of the pipe (12, 3, or 9
Flow Computer
Tek-DP 1640A
Transmitter
Tek-DP 1640A
• Use loop calibrator and apply 4, 12, and 20mA to computer / system.
• Each of these points should be correlate with the Venturi Tube sizing information.
• Current output signal is read incorrectly.
• Apply a known current to the loop and read the
raw signal in the computer.
• M
ost computers allow the user to see the mA
• Periods with a partially full pipe will cause
•
• This will increase the restriction of the meter
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• Remove the meter for visual inspection.
Gauge Lines
• Possibility of leakage within the line.
• Meter body, near the pressure taps.
the DP. Remove the meter and visually inspect.
• Leak on low pressure gauge line.
transmitter.
• Leak on low pressure vent valve. Perform a leak
low.
Tek-DP 1640A
• If any arrow is not visible and the meter is large
• The pressure taps will be closer to the
• On meters less than 2”, the gauge lines will
• The smooth tap is on the upstream side.
• Flow is going in the opposite direction from
• Verify with other system readings.
Tek-DP 1640A
Signal Very High
• With a meter measuring backward flow, the DP
• Partially full pipe (liquids only). A partially full
• F
than 2”, the flow direction can be determined by the location of the pressure taps.
upstream side.
need to be removed. Look at the base of both pressure taps. One tap will be smooth at the base, the other will be mostly weld material.
what was expected. The assumption of flow direction is sometimes wrong.
signal will be approximately 30% high.
pipe will cause the meter to read very high value. This can happen even in pressurized systems.
o On horizontal pipes: If the fluid is safe,
open a pressure tap on the top of the pipe. Air release will indicate partially full pipe.
o On vertical pipes: Up flow will
guarantee a full pipe. Down flow is difficult to diagnose if the pipe is full.
oreign object lodged in meter. This will
increase the restriction of the meter and raise
Gauge Lines
Transmitter
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• Perform a leak check from the meter to the
check on valve.
ro point has shifted positively. This will cause
• Ze errors more pronounced at the low end of the transmitter range.
• Verify by closing the manifold side valves and opening the center valve. The reading should go to zero (4mA).
• R
ecalibrate if necessary. DP span is set very
Instruction Manual
Tech nology S olutions
23
• Use pressure calibrator or handheld communicator to verify span point.
• Both the transmitter and flow computer are set
error will increase dramatically as the signal
Use a loop calibrator to check 12mA point.
• 4mA set to minimum flow.
offset.
• Manifold is cross-vented. The center valve
valve is not closed completely.
• Leak on high pressure gauge line.
transmitter.
• Perform a leak check on valve to identify leak
to verify span point.
• Neither the transmitter nor flow computer is
• Use a loop calibrator to check 12mA point.
Tek-DP 1640A
to take the square root of the signal. Transmitter/ Flow Computer
Flow Computer
Manifold
he signal will be correct at 20mA. The positive
• T
decreases from 20mA.
•
• Our calculations assume that 4 mA will be
equal to zero flow. Sometimes 4 mA is set to
equal the minimum flow on the sizing page.
• This error will be zero at maximum flow and increase as the flow decreases.
he amount of error will depend on the zero
• T
must be closed.
test, close the two side valves and watch the
• To transmitter signal.
• I
f the signal goes to zero (4mA), the center
Signal Very Low
Gauge lines
Transmitter
Transmitter/ Flow Computer
• Perform a leak check from the meter to the
on high pressure vent valve.
ro point when shifted negatively will cause
• Ze errors more pronounced at the low end of the transmitter range. Verify by closing the manifold side valves and open the center valve. The reading should go to zero (4mA). Recalibrate if necessary.
ransmitter DP span is set too high hence use
• T pressure calibrator or handheld communicator
set to take the square root of the signal. The signal will be correct at 20mA.
• T
he negative error will increase dramatically as
the signal decreases from 20mA.
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