ABB COPA-XM 3000 Series User manual

INSTRUCTION MANUAL
MAGNETIC FLOWMETERS
10DS3111 Design Level A
Sizes 14 through 24 inches
SERIES 3000 AC MAGNETIC FLOWMETER
PN25012

The following are trademarks of ABB Inc.: MINI-MAG
The following is a registered trademark of DuPont: TEFLON®
TEFZEL®
The following is a trademark of Haynes International Incorporated: HASTELLOY
The following is a registered trademark of Richard Klinger, Inc.: KLINGER®
The following is a registered trademark of Ladish Company, Tri-Clover Div: TRI-CLAMP®
The following is a registered trademark of Garlock Inc.: GYLON®
WARNING notices as used in this manual apply to hazards or unsafe practices which could result in personal in-
jury or death.
CAUTION notices apply to hazards or unsafe practices which could result in property damage.
NOTES highlight procedures and contain information which assist the operator in understanding the information
contained in this manual.
All software, including design, appearance, algorithms and source codes, is owned and copyrighted by
ABB Inc. or its suppliers.
WARNING
INSTRUCTION MANUALS
Do not install, maintain or operate this equipment without reading, understanding and following the
proper ABB Inc. instructions and manuals, otherwise injury or damage may result.
POSSIBLE PROCESS UPSETS
Operation & maintenance must be performed only by qualified personnel and only after securing
equipment controlled by this product. Adjusting or removing this product while it is in the system may
upset the process being controlled. Some process upsets may cause injury or damage.
NOTICE
The information contained in this document is subject to change without notice. ABB Inc. reserves the
right to make minor changes to this publication, such as company name & logos as well as other minor
corrections, without necessarily changing the publication number.
ABB Inc., its affiliates, employees, and agents, and the authors of and contributors to this publication
specifically disclaim all liabilities and warranties, express and implied (including warranties of
merchantability and fitness for a particular purpose), for the accuracy, currency, completeness, and/or
reliability of the information contained herein and/or for the fitness for any particular use and/or for the
performance of any material and/or equipment selected in whole or part with the user of/or in reliance
upon information contained herein. Selection of materials and/or equipment is at the sole risk of the
user of this publication.
This document contains proprietary information of ABB Inc. and is issued in strict confidence. Its use,
or reproduction for use, for the reverse engineering, development or manufacture of hardware or
software described herein is prohibited. No part of this document may be photocopied or reproduced
without the prior written consent of ABB Inc.
Copyright 2002 ABB Inc. [May, 2002]

Table of Contents
READ FIRST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Signal Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.3 Model Number Breakdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2.0 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Meter Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.3 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.4.1 Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2.4.2 Pipe Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.5 Grounding Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.5.2 Conductive Pipeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.5.3 Non-Conductive or Electrically Insulated Pipeline . . . . . . . . . . . . . . . . . . 2-9
2.6 Electrical Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.7 Conduit Seal and Pressure Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
3.0 START-UP and OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
4.0 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1 Basic Operating Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1.1 Signal Voltage Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1.2 Volumetric Flow Rate Measurement . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2 Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.1 Liquid Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.2 Metering Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
5.0 CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.2 System Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.3 Static Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.3.1 Magnet Coil Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.3.2 Electrode Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
7.0 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
10DS3111A INSTRUCTION MANUAL
i

List of Figures
FIGURE 1-1. TYPICAL 10DS3111A MAGNETIC FLOWMETER . . . . . . . . . . . . . . . . 1-1
FIGURE 1-2. ELECTRONIC COMPARTMENT WITH COVERS REMOVED . . . . . . . . . 1-3
FIGURE 2-1. PROPER HOISTING TECHNIQUE . . . . . . . . . . . . . . . . . . . . . . . . 2-2
FIGURE 2-2. OUTLINE DIMENSIONS, 14 THROUGH 24 INCHES . . . . . . . . . . . . . . 2-3
FIGURE 2-3. RECOMMENDED PIPING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . 2-4
FIGURE 2-4. FLANGE BOLT TIGHTENING SEQUENCE . . . . . . . . . . . . . . . . . . . 2-5
FIGURE 2-5. GASKET LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
FIGURE 2-6. GROUNDING PROCEDURE, CONDUCTIVE PIPELINE . . . . . . . . . . . . 2-8
FIGURE 2-7. GROUNDING PROCEDURE, NON-CONDUCT. PIPELINE . . . . . . . . . . . 2-9
FIGURE 2-8. GROUNDING PROBE (OPTIONAL) . . . . . . . . . . . . . . . . . . . . . . 2-10
FIGURE 2-9. CONDUIT ENTRY SEAL INSTALLATION . . . . . . . . . . . . . . . . . . . 2-11
FIGURE 3-1. TYPICAL INSTRUMENT TAG . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
FIGURE 4-1. BASIC OPERATING PRINCIPLE . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
FIGURE 5-1. DIAGRAM OF FLOWMETER CIRCUIT . . . . . . . . . . . . . . . . . . . . . 6-2
List of Tables
TABLE 1-1. MAXIMUM LIQUID TEMPERATURE . . . . . . . . . . . . . . . . . . . . . . . . 1-7
TABLE 1-2. FLOW RANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
TABLE 2-1. RECOMMENDED BOLT TORQUES . . . . . . . . . . . . . . . . . . . . . . . . 2-5
TABLE 6-1. METER COIL RESISTANCE-SIZES 14 THROUGH 24 INCHES . . . . . . . . . 6-3
TABLE 7-1. FLOWMETER ELECTRONICS BOARD . . . . . . . . . . . . . . . . . . . . . . 7-1
TABLE 7-2. GROUNDING RINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
10DS3111A INSTRUCTION MANUAL
ii

READ FIRST
WARNING
INSTRUCTION MANUALS
Do not install, maintain, or operate this equipment without reading,
understanding and following the proper manufacturer’s instructions and
manuals, otherwise injury or damage may result.
RETURN OF EQUIPMENT
All flowmeters and/or signal converters being returned to the
manufacturer for repair must be free of any hazardous materials (acids,
alkalis, solvents, etc). A Material Safety Data Sheet (MSDS) for all
process liquids must accompany returned equipment. Contact the
manufacturer for authorization prior to returning equipment.
Read these instructions before starting installation;
save these instructions for future reference.
Contacting the Manufacturer
Should assistance be required with any Instrumentation product, contact the following:
Telephone:
Automation Services Call Center
1-800-HELP-365
E-Mail:
ins.techsuppor[email protected]
10DS3111A INSTRUCTION MANUAL
I

The NEMA 4X rating applies to the meter body and electronics enclosure only. The following
accessories (if supplied) may not meet NEMA 4X unless specifically ordered as NEMA 4X:
•meter flanges
•meter installation hardware: studs, nuts, bolts
•enclosure mounting hardware for pipe or wall mounting
•conduit hardware
This product is painted with a high performance epoxy paint. The corrosion protection provided by
this finish is only effective if the finish is unbroken. It is the users’ responsibility to "touch-up" any
damage that has occurred to the finish during shipping or installation of the product. Special attention
must be given to: meter flange bolting, pipe mounting of electronics, conduit entries and covers that
are removed to facilitate installation or repair. For continued corrosion protection throughout the
product life, it is the users’ responsibility to maintain the product finish. Incidental scratches and other
finish damage must be repaired and promptly re-painted with approved touch-up paint. Provide the
model number and size of your product to the nearest ABB Inc. representative to obtain the correct
touch-up paint.
10DS3111A INSTRUCTION MANUAL
II

1.0 INTRODUCTION
1.1 General
The Series 10DS3111 COPA-AC mag-
netic flowmeter is an electromagnetic
liquid flow rate detector. The meter
uses the characteristics of a conduc-
tive liquid to generate an induced volt-
age, directly proportional to flow rate,
as the liquid passes internal elec-
trodes. The resultant voltage is ap-
plied to a solid state electronics
package that conditions it to an output
signal compatible with conventional
receiving equipment.
The flowmeter’s design provides a low
power, obstructionless metering ele-
ment that bolts between flanges in a
process pipeline. Pressure losses in
this type of meter are reduced to levels
occurring in equivalent lengths of
equal diameter pipeline, reducing or
conserving pressure source require-
ments as compared to other metering
methods. The meter requires no addi-
tional support other than that used on
normal pipe runs.
This flowmeter can be used to meter either clean or dirty liquids. The meter may be used with many
non-homogeneous liquids and is as independent of the tendency to plug or foul as the pipeline in
which it is mounted. By design, only the liner and electrodes are wetted parts and will accommodate
most acids, bases, water and aqueous solutions.
Viscosity and density of the metered liquid have no effect on the measurement accuracy of the meter
and, therefore, signal compensation is not required. Metering limitations are confined to a minimum
threshold of electrical conductivity inherent to the liquid being metered. The degree of liquid conduc-
tivity has no effect upon the metering accuracy (as long as it is greater than the minimum level). The
liquid temperature and pressure are limited only to the meter material specification limit.
Figure 1-1 shows the general configuration of a typical meter while Figure 1-2 shows the meter’s
electronics housing with the cover removed.
1.2 Signal Converters
The 10DS3111 COPA-AC magnetic flowmeter has been designed for operation with AC driven
magnet coils. This design requires a 50/60 Hz reference and zero assembly, which is integrally
mounted in the flowmeter electronics housing. The signal converter must be remotely mounted
and is supplied in an enclosure suitable for either wall, panel, or pipe mounting.
FIGURE 1-1. TYPICAL 10DS3111A
MAGNETIC FLOWMETER
10DS3111A INSTRUCTION MANUAL
1-1

The signal converter used with the 10DS3111 is the model 50SM1000 and it must conform to the
following requirements:
Operating Mode: Signal Converter operating mode (Primary) shall be set to
"1OD1462".
Reference Impedance: The model 50SM1000 signal converter is available with a
reference input option which must always be 1000 ohms and
must be specified at time of order. The S901 switch on the
terminal board, located in the base of the converter housing,
must be set in the closed position (hooked) to select 1000
ohms.
Power Consumption: <250 VA
Line power shall be 110/120 VAC, 50/60 Hz.
Interconnections: The interconnection wiring diagram shown in Figure 2-3 of
the 50SM1000 signal converter instruction manual applies
only to sizes below 14 inches. Power and signal interconnec-
tions for the 10DS3111 must be made as shown in Figure 2-9
of this manual.
10DS3111A INSTRUCTION MANUAL
1-2

FIGURE 1-2. ELECTRONIC COMPARTMENT WITH COVERS REMOVED
10DS3111A INSTRUCTION MANUAL
1-3

1.3 Model Number Breakdown
Refer to the instrument data sheet or the data tag on the equipment for the model number of the
instrument furnished. The details of a specific number are shown on the following pages.
10DS3111 AE__P 1 A ______2_
Engineering Reference
AC Magnetic Flowmeter
Design Level A
Meter Lay Length
Replacement for 10D1462 E
Liner Material
Hard Rubber
Polyurethane
PTFE Teflon
Neoprene
A
D
E
L
Size
in. (mm)
14 (350)
16 (400)
18 (450)
20 (500)
24 (600)
21
22
35
23
24
Flange Standard/Pressure Rating
Mates with ANSI Class 150 P
Flange Material
Carbon Steel 1
Protector Plates
None Required A
Electrode Type
Flush
Bullet Nose
Slurry Service
2
3
7
Electrode Material
316 Stainless Steel
Hastelloy "B"
Hastelloy "C"
Titanium
Tantalum
Zirconium
B
C
D
E
F
L
10DS3111A INSTRUCTION MANUAL
1-4

1.3 Model Number Breakdown [Cont.]
10DS3111 AE__P 1 A______2_
Certifications
Standard (None)
FM Approved - Nonincendive for CLI, Div2, Gp A,B,C & D:
Electrodes Intrinsically Safe for CLI, Div 1, Gp A,B,C&D: Outdoor
Hazardous Locations, NEMA 4X. Dust Ignitionproof CLII, Div 1,
Gp E,F&G: Suitable for CLIII, Div 1
A
K
Enclosure Classification
General Purpose: IEC 529 IP65, NEMA 4X
Accidental Submergence: IEC 529 IP67, NEMA 4X
33 ft. H2O/48 hr (10m H2O/48 hr)
Accidental Submergence: IEC 529 IP67, NEMA 4X
33 ft. H2O/48 hr (10m H2O/48 hr) Tropical - Improved
Moisture Protection signal cable permanently installed.
1
2
9
Fluid Temperature Range
Hard Rubber, <176oF (80oC)
Neoprene, Polyurethane, <190oF (88oC)
TEFLON, <212oF (100oC)
3
4
6
Line / Excitation Frequency
50 Hz
60 Hz
1
3
Customer Information Language
English 2
Converter Type (Ref.)
50SM1000
Other
None
1
9
X
10DS3111A INSTRUCTION MANUAL
1-5

1.4 Specifications
Power Requirements 120 VAC, 60 Hz, <50 VA
Meter Size/Flow Capacity See Table 1-1
Span Factory set at specified range between extremes
listed in Table 1-1; can be field adjusted.
Rangeability 20:1
Minimum Liquid Conductivity 5 µS/cm (20 µS/cm with 100 ft signal cable)
System Accuracy
Flowrate Accuracy
Analog Output < 10%
> 10%
±0.2% fsc
±1.0% of rate + 0.1% fsc
Frequency Output < 10%
> 10%
±0.2% fsc
±1.0% of rate + 0.1% fsc
RFI Susceptibility Class 2-abc-0.5% (10 V/m-20 to 1000 MHz) Per
SAMA Standard PMC 33.1-1978.
Enclosure Classification
Standard NEMA 4X, IEC 529 IP65
Accidental Submergence NEMA 4X, IEC 529 IP67,
30 feet H2O/48 h (9 m H2O /48 h)
Environmental Temperature Limits -40 to 150oF (-40 to 65oC)
Meter Capacity Specified on flowmeter data tag
Physical Characteristics
14 - 24 inch (350 - 600mm) Refer to Figure 2-5
Conduit Connections two 1⁄2inch NPT internally threaded openings
Vibration Limits (flowmeter) 5 to 14 Hz, 0.20 inch
14 to 2000 Hz, 1.5 g
Materials of Construction
Meter Liner Refer to Section 1.3
Electrodes Refer to Section 1.3
10DS3111A INSTRUCTION MANUAL
1-6

Electronics Housing die cast aluminum, epoxy finish, 316 sst cover
screws, gasketed covers
Certifications Refer to Section 1.3
Process Limits
Consult the factory for vacuum limits
TABLE 1-1. MAXIMUM LIQUID TEMPERATURE
Liner Material Temperature
TEFLON (PTFE) 212oF(100oC)
Neoprene/Polyurethane 190oF (88oC)
Hard Rubber 176oF (80oC)
TABLE 1-2. FLOW RANGES
Flow Ranges
0 to value tabulated Span Setting by factory
if not specified by user
Meter Size Minimum Span Setting Maximum Span Setting
inch mm gpm m3/h gpm m3/h gpm m3/h
14 350 1520 350 15200 3500 4500 1000
16 4000 1980 450 19800 4500 6000 1400
18 450 2500 570 25000 5700 8000 1800
20 500 3100 700 31000 7000 9000 2000
24 600 4500 1000 45000 10000 13000 3000
10DS3111A INSTRUCTION MANUAL
1-7

2.0 INSTALLATION
2.1 Inspection
All meters are shipped in heavy-duty containers which are specially designed to provide adequate
protection during transit. Because the meter will be operated in conjunction with a signal converter, it
is likely that both instruments will be included in the same shipping container. An itemized list of all
items included in the shipment is attached to the shipping container. Refer to the instruction manual
supplied with the signal converter for operation and maintenance procedures for the converter.
The meter is supplied with a signal converter, a 30-ft length (standard) of interconnection cable and
conduit seals.
Inspect all items included in the shipment immediately for indications of damage which may have
occurred during shipment. All damage claims should be reported to the shipping agent involved
before attempting to install or operate this equipment. If the damage is such that faulty operation is
likely to result, the damage should be brought to the attention of the factory Service Department.
2.2 Meter Handling
During shipment, the meter liner is protected by wood or composition protectors attached to the
meter flanges. These are removed before the meter is installed; leave them in position while moving
the meter to the installation site
To place the meter in the pipeline a sling and hoist may be necessary. Do not pass a rope or wire
sling through the meter; the liner will be damaged if the meter is supported by the liner. Lift the meter
as shown in Figure 2-1.
The meter weights are listed in Figure 2-2.
2.3 Location
The meter is suitable for either indoor or outdoor installation. When selecting the installation site,
consideration should be given to the enironmental and process temperature limits, as stated in the
specifications. Consideration should be given to access for servicing the meter. The standard
watertight corrosion-resistant meter enclosure is rated NEMA 4X, watertight, and will withstand rain
and hose down. If flooding is a problem, the optional IEC 529 IP67 flowmeter is rated for accidental
submersion. For added protection, a "tropicalized" version is available which includes electronics
encased in a watertight silicone rubber material and a permanently-installed cable.
Outline dimensions of the meter are given in Figure 2-2. Access for wiring interconnections, cover
removal and servicing should be considered when selecting the installation site.
Outline dimensions of the signal converter are given in the instruction manual supplied with the signal
converter.
The installation site must be provided with a source of power as specified for the signal converter.
The power line should have a disconnect switch, and suitable fuse or circuit breaker as shown on the
applicable interconnection diagram provided in the instruction manual supplied with the Signal
Converter.
10DS3111A INSTRUCTION MANUAL
2-1

It is recommended that the meter not be installed within the immediate proximity of heavy induction
equipment.
NOTE
Refer to the 50SM1000 converter Instruction Manual for the
interconnection wiring diagram. Note that these larger size
meters are wired differently from the 1/2 through 12 inch sizes
and should be wired according to Figure 2-2 (lD-50-1824) and
Figure 2-4 (lD-50-1822) in the 50SM1000 Instruction Manual.
FIGURE 2-1. PROPER HOISTING TECHNIQUE
10DS3111A INSTRUCTION MANUAL
2-2

FIGURE 2-2. OUTLINE DIMENSIONS, 14 THROUGH 24 INCHES
10DS3111A INSTRUCTION MANUAL
2-3

2.4 Mounting
2.4.1 Orientation
The meter may be installed in horizontal, vertical or sloping pipe runs. However, precautions must be
taken to assure that the metering tube is f~d at all times during measurement. A Vertical installation,
with the pipe line carrying liquid upwards assures a filled line under low flow rate conditions and also
minimizes wear on the meter lining by abrasive grit. Horizontal installations should be made with the
meter in the lower section of a pipeline to assure a filled meter condition.
For horizontal or sloping installations the meter should be placed so that the electronic housing of the
meter is on top. This will align the meter electrodes in a lateral plane. Positioning the meter in this
way eliminates the possibility of entrained air acting as an electrode insulator.
The meter must be oriented in accordance with the direction of process flow, as indicated by the
FLOW ARROW on the meter data tag. For accurate metering, a straight pipe run equivalent to a
minimum of three straight pipe diameters are required upstream of the meter, measured from the
center of the meter. See Figure 2-3 for recommended piping diagram.
If a control valve is required, it is recommended that it be placed downstream of the meter. Upstream
valves can create turbulence that result in air pockets and may affect the meter’s accuracy or cause
its output to be noisy. A minimum of ten pipe diameters of straight pipe are required upstream
between the meter and a control valve or pump (refer to Figure 2-3).
FIGURE 2-3. RECOMMENDED PIPING DIAGRAM
10DS3111A INSTRUCTION MANUAL
2-4

2.4.2 Pipe Connections
The TEFLON and polyurethane lined meters have ANSI raised faced flanges rated as Class 150. The
neoprene lined meters have ANSI full faced flanges rated as Class 150. Two flange gaskets are
supplied per meter; the mounting studs and nuts are furnished by the user.
Fastener threads must be clean and lubricated and flange nuts should be tightened in an alternate
pattern (Refer to Figure 2-4) to produce equal pressure distribution around the flange face. Bolt
torque should be limited to the values shown in TABLE 2-1 for the liner materials shown. PTFE lined
meters should be retorqued after 24 hours. Due to their resiliency, Polyurethane and Neoprene lined
meter bolts should be tightened to 1/2 the values listed in TABLE 2-1. Additional tightening up to the
values listed may be necessary to achieve an effective seal.
TABLE 2-1. RECOMMENDED BOLT TORQUES
METER SIZE PTFE TEFLON, HARD RUBBER
ft-lbs (Nm)
14 in. 120 (160)
16 in. 115 (155)
18 in. 175 (240)
20 in. 155 (210)
24 in. 220 (300)
FIGURE 2-4. FLANGE BOLT
10DS3111A INSTRUCTION MANUAL
2-5

Refer to Figure 2-3 for recommended piping arrangement and Figure 2-5 for proper gasket locations.
If a throttling valve is required, it is strongly recommended that it be placed downstream of the meter.
Upstream valves can create turbulence that result in undesirable air pockets and may affect the
meter’s accuracy or cause its output to be noisy.
FIGURE 2-5. GASKET LOCATIONS
10DS3111A INSTRUCTION MANUAL
2-6

2.5 Grounding Procedure
2.5.1 General
Satisfactory operation of the flowmeter system requires that careful attention be paid to proper
grounding techniques. A good ground is one that is in contact with the earth over a large conductive
area. An excellent example of this is a cold water pipe which is buried in the earth and travels many
miles in its distribution system. A great number of pipe branches form a large conductive area of
contact which provides a low resistance connection to earth. A hot water or steam pipe must first
return to a boiler before it becomes a cold water pipe, therefore, its greater length of ungrounded path
offers a less desirable ground bus. A metallic structural member of a building, such as a supporting
"I" beam, may be a good earth ground, but it is a second choice to a cold water pipe.
NOTE
If selecting a cold water pipe for meter grounding purposes, the
user should be aware that is becoming more common to use
sections of PVC piping in the cold water piping system. It is the
user’s responsibility to make certain that there is electrical
continuity between where the meter is grounded on the copper
cold water pipe and where the copper cold water pipe actually
enters the earth
Meter grounding requirements are a combination of standard grounding methods and a bonding of
the meter body to the process liquid. The most important of these is the process bonding, which is
insuring that the meter body is in contact with the process liquid at both ends of the meter body. The
bonding process places an electrical short circuit across the meter, thereby routing any stray current
around the meter (rather than through it).
From the point of view of grounding there are two basic types of piping systems:
•electrically conductive pipeline: the process liquid comes in contact with
conductive pipe. This piping requires that each meter flange be connected with a
bonding wire to the adjacent pipeline flange. The grounding procedure to use with
conductive pipeline is described in 2.5.2.
•non-conductive or electrically insulated pipeline: the pipeline may be made of an
electrically non-conductive material (plastic, concrete, etc.) or lined with a
non-conductive material (rubber, TEFLON, etc). These non-conductive pipelines
require the use of metal grounding rings or grounding probes to bond the process
to ground. The grounding procedure to use with nonconductive pipeline is
described in 2.5.3.
NOTE
Proper grounding of the meter is required for optimum system
performance.
10DS3111A INSTRUCTION MANUAL
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