Emerson Rosemount 3812 User manual

Installation manual
00825-0100-3812, Rev AB
January 2023
Rosemount™ 3812 Liquid Ultrasonic Flow
Meter
for Direct and Remote Mount Meter Electronics

Safety and approval information
This Rosemount product complies with all applicable European directives when properly installed in accordance with
the instructions in this manual. Refer to the EU declaration of conformity for directives that apply to this product. The
EU declaration of conformity, with all applicable European directives, and the complete ATEX Installation Drawings
and Instructions are available on the internet at www.emerson.com or through your local Emerson support center.
Information affixed to equipment that complies with the Pressure Equipment Directive, can be found on the internet
at www.emerson.com.
For hazardous installations in Europe, refer to standard EN 60079-14 if national standards do not apply.
Other information
Full product specifications can be found in the product data sheet. Troubleshooting information can be found in the
user manual. Product data sheets and manuals are available from the Emerson website at www.emerson.com.
Return policy
Follow Emerson procedures when returning equipment. These procedures ensure legal compliance with government
transportation agencies and help provide a safe working environment for Emerson employees. Emerson will not
accept your returned equipment if you fail to follow Emerson procedures. Return procedures and forms are available
on our web support site at www.emerson.com, or by phoning the Emerson Customer Service department.
Emerson Flow customer service
Email:
•Worldwide: [email protected]
•Asia-Pacific: [email protected]
Telephone:
North and South America Europe and Middle East Asia Pacific
United States 800 522 6277 U.K. 0870 240 1978 Australia 800 158 727
Canada [phone] The
Netherlands
[phone] New Zealand 099 128 804
Mexico [phone] France 0800 917 901 India 800 440 1468
Argentina [phone] Germany 0800 182 5347 Pakistan 888 550 2682
Brazil [phone] Italy 8008 77334 China [phone]
Central &
Eastern
[phone] Japan [phone]
Russia/CIS [phone] South Korea [phone]
Egypt 0800 000 0015 Singapore [phone]
Oman 800 70101 Thailand 001 800 441 6426
Qatar 431 0044 Malaysia 800 814 008
Kuwait 663 299 01
South Africa 800 991 390
Saudi Arabia 800 844 9564
UAE 800 0444 0684
2

Contents
Chapter 1 Introduction............................................................................................................... 5
1.1 General overview of Rosemount 3812 Liquid Ultrasonic Flow Meter...................................5
1.2 Typical applications..................................................................................................................... 5
1.3 Features and benefits of this product.......................................................................................6
1.4 Acronyms, abbreviations and definitions.................................................................................6
1.5 MeterLink software..................................................................................................................... 9
1.6 Rosemount 3812 Liquid Ultrasonic Flow meter design........................................................10
1.7 Meter specifications..................................................................................................................15
1.8 Pre-installation considerations................................................................................................21
1.9 Safety conditions....................................................................................................................... 22
1.10 Certifications and approvals.................................................................................................. 22
1.11 FCC compliance....................................................................................................................... 23
Chapter 2 Mechanical Installation...........................................................................................25
2.1 Meter piping, lifting and mounting.........................................................................................25
2.2 Meter components....................................................................................................................26
2.3 Piping recommendations......................................................................................................... 31
2.4 Meter safety for hoist rings and lifting slings........................................................................33
2.5 Mounting requirements in heated or cooled pipelines........................................................40
Chapter 3 Electrical Installation.............................................................................................. 43
3.1 Cable length TTL mode.............................................................................................................43
3.2 Cable length Open Collector mode.........................................................................................43
3.3 Grounding meter electronics...................................................................................................44
3.4 Conduit seals..............................................................................................................................45
3.5 Wiring and I/O........................................................................................................................... 47
3.6 Rosemount Ultrasonic Meters I/O connections.................................................................... 54
3.7 Security seal installation...........................................................................................................59
Chapter 4 Configuration........................................................................................................... 69
4.1 Set up MeterLink....................................................................................................................... 69
4.2 Using AMS Device Manager to configure the meter............................................................ 74
4.3 Using a Field Communicator to configure the meter...........................................................89
4.4 Security seals for the meter..................................................................................................... 91
4.5 Configure users and network security................................................................................... 91
Appendix A Engineering Drawings............................................................................................. 93
A.1 Rosemount 3812 Liquid Ultrasonic Flow Meter drawings................................................... 93
Appendix B Open Sources licenses ............................................................................................ 97
B.1 List of Open Source licenses....................................................................................................97
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Contents Installation manual
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4 Rosemount 3812 Liquid Ultrasonic Flow Meter

1 Introduction
1.1 General overview of Rosemount 3812
Liquid Ultrasonic Flow Meter
Rosemount 3812 Liquid Ultrasonic Flow Meters have direct mount or remote
mount electronic options and various configurations that meet a broad range of
customer requirements. Each meter comes fully assembled from Emerson. and all
parts and assemblies are tested prior to shipment. Refer to the following
documents for additional details:
•00825-0300-3810 HART® Field Device Specification for Liquid Ultrasonic Flow
Meters
•00809-0100-7630 MeterLink™ Software for Rosemount Gas and Liquid
Ultrasonic Flow Meters
•00809-0100-3812 Rosemount Model 3812 Liquid Ultrasonic Flow Meter
Maintenance and Troubleshooting Manual
The Rosemount 3812 Liquid Ultrasonic Flow Meter technology can be applied to
allocation measurement and check metering applications as shown below.
1.2 Typical applications
•Allocation measurement
•Check metering
•Leak detection
•Line balancing
•Batch control
•Loading and off loading
•Offshore
—FPSO (Floating Production, Storage and Offshore Loading)
—Offshore Platforms
—Barges
•Pipelines
—Crude Oil pipelines
—Refined product pipelines
•Terminals
—Loading and off-loading (Ship, barge, truck, railcar, etc.)
—Tank Farms
—Cavern Storage
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1.3 Features and benefits of this product
•Explosion-proof transmitter electronics enclosure with CPU Module, Power
Supply, Intrinsic Safety Barrier Module
•Intrinsically safe transducer electronics enclosure with the Acquisition Module
•MeterLink (software for Rosemount Ultrasonic Flow Meters)
•HART® and AMS Suite: Intelligent Device Manager communications for
PlantWeb™ architecture
•Direct mount or remote mount options electronics
•Reduce unaccounted measurement
•Increase energy savings
•Replaceable transducers while under pressure
•Extensive self diagnostics
•Immediate alarm reporting
•Auto-detected ASCII/RTU Modbus communications protocol
•Interchangeable electronics modules
•Internet-ready communications
•Ethernet access
•Modbus TCP/IP
•On-board LED status indicators
•Analog pressure and temperature inputs
•Local display and glass endcap (optional)
1.4 Acronyms, abbreviations and definitions
Table 1-1: Acronyms, abbreviations and definitions
Acronym or abbreviation Definition
° degree (angle)
°C degrees celsius (temperature unit)
°F degrees fahrenheit (temperature unit)
ADC analog-to-digital converter
AI analog input
AMS® Suite Device Manager Asset Management Software - Device
Manager
AO analog output
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Table 1-1: Acronyms, abbreviations and definitions (continued)
Acronym or abbreviation Definition
ASCII MODBUS A Modbus protocol message framing
format in which ASCII characters are used
to delineate the beginning and end of the
frame. ASCII stands for American Standard
Code for Information Interchange.
boolean A type of data point that can only take on
values of TRUE or FALSE (generally TRUE is
represented by a value of 1, FALSE is
represented by a value of 0)
bps Bits per second (baud rate)
cPoise Centipoise (viscosity unit)
CPU Central Processing Unit
CTS Clear-to-Send; the RS-232C handshaking
signal input to a transmitter indicating that
it is okay to transmit data – i.e., the
corresponding receiver is ready to receive
data. Generally, the Request-to-Send (RTS)
output from a receiver is input to the Clear-
to-Send (CTS) input of a transmitter.
DAC Digital-to-Analog Converter
MeterLink™Ultrasonic Meter interface software
DI Digital Input
Direct Mount Transmitter electronics enclosure and base
electronics enclosure is directly mounted to
meter body
DO Digital Output
DHCP Dynamic Host Configuration Protocol
dm decimeter (10-1 meters, length unit)
ECC Error Correction Code
EEPROM Electrically-Erasable, Programmable Read-
Only Memory
Flash non-volatile, programmable read-only
memory
FODO Output that is user configurable as either a
frequency or digital output
HART® Communication Protocol Highway Addressable Remote Transducer
communications protocol
hr hour (time unit)
Hz Hertz (cycles per second, frequency unit)
I/O Input/Output
IS Intrinsically Safe
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Table 1-1: Acronyms, abbreviations and definitions (continued)
Acronym or abbreviation Definition
K Kelvin (temperature unit)
kHz Kilohertz (103 cycles per second, frequency
unit)
LAN Local Area Network
LED Light-emitting Diode
m meter (length unit)
m3/d cubic meters per day (volumetric flow rate)
m3/h cubic meters per hour (volumetric flow rate)
m3/s cubic meters per second (volumetric flow
rate)
mA milliamp (current unit)
MAC Address Media Access Control (Ethernet Hardware
Address -EHA)
microinch (μinch) microinch (10-6 in)
micron micrometer (10-6 m)
MMU Memory Management Unit
MPa Megapascal (equivalent to 106 Pascal)
(pressure unit)
N/A Not Applicable
Nm3/h normal cubic meters per hour
NOVRAM Non-volatile Random Access Memory
Pa Pascal, equivalent to 1 newton per square
meter (pressure unit)
Pa⋅s Pascal Second (viscosity unit)
PC Personal Computer
P/N part number
PS power supply (board)
psi pounds per square inch (pressure unit)
psia pounds per square inch absolute (pressure
unit)
psig pounds per square inch gage (pressure
unit)
R Radius
rad radian (angle)
RAM Random Access Memory
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Table 1-1: Acronyms, abbreviations and definitions (continued)
Acronym or abbreviation Definition
Remote Mount Option Detaching the transmitter electronics
enclosure and base electronics enclosure
from meter body and mounting and
affixing them with the mounting bracket to
a pole or other structure.
RTS Request-to-Send; the RS-232C handshaking
signal output by a receiver when it is ready
to receive data
RTU MODBUS A Modbus protocol framing format in which
elapsed time between received characters
is used to separate messages. RTU stands
for Remote Terminal Unit.
s second (time unit, metric)
SDRAM Synchronous Dynamic Random Access
Memory
sec second (time unit, U.S. customary)
TCP/IP Transmission Control Protocol/Internet
Protocol
time_t seconds since Epoch (00:00:00 UTC Jan. 1,
1970) (time unit)
UDP User Datagram Protocol
U.L. Underwriters Laboratories, Inc. - product
safety testing and certification organization
V Volts (electric potential unit)
W Watts (power unit)
1.5 MeterLink software
MeterLink software has robust features for setting communications parameters,
calibrating your meter, collecting logs and reports and monitoring the meter
health and alarm statuses. MeterLink may be downloaded at no charge from:
www.emerson.com/meterlink
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Figure 1-1: MeterLink download and registration
Select the MeterLink software and firmware bundle appropriate for your meter.
Complete the Online registration form and you will receive a confirmation email
with a hyperlink directing you to the download site.
NOTICE
After the download, follow the instructions in the Readme file. Do not attempt to
unzip the zipped firmware file. MeterLink unzips the compressed file using the
Tools → Program Download utility.
Refer to the MeterLink Software for Gas and Liquid Ultrasonic Meters Quick Start
Manual (00809-0100-7630) for installation instructions and to setup initial
communications. You may download the manual from the MeterLink web page:
www.emerson.com/meterlink
1.6 Rosemount 3812 Liquid Ultrasonic Flow
meter design
The Rosemount 3812 Liquid Ultrasonic Flow Meter designs include a direct or
remote mount electronics option and depending on the meter’s outside diameter,
have a shroud cover protecting the transducers and cable assemblies. See Table
2-1 and the list below for meter body shroud types. Shroud options are:
•split shroud
•bolted band shroud
•latched single band shroud
•clamped band shroud
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Figure 1-2: Direct mount electronics assembly with split shroud
A. Explosion-proof transmitter enclosure (CPU Module, Power Supply, I.S. Barrier
Board, Backplane board, and optional LCD Board with glass endcap)
B. Intrinsically-safe base enclosure includes Acquisition Module
C. Meter - body and split shroud for transducers and cables assemblies
Figure 1-3: Direct mount electronics with latched single band shrouds and
remote display
A. Explosion-proof transmitter enclosure (CPU Module, Power Supply, I.S. Barrier
Board, Backplane board, and optional LCD Board with glass endcap)
B. Intrinsically-safe base enclosure includes Acquisition Module
C. Meter - body and latched band shrouds for transducers and cable assemblies
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Figure 1-4: Direct mount electronics with bolted single band shrouds and
local display
A. Explosion-proof transmitter enclosure (CPU Module, Power Supply, I.S. Barrier
Board, Backplane board, and optional LCD Board with glass endcap)
B. Intrinsically-safe base enclosure includes Acquisition Module
C. Meter - body and latched band shrouds for transducers and cable assemblies
Figure 1-5: Direct mount electronics assembly with clamped band shrouds
A. Explosion-proof transmitter enclosure (CPU Module, Power Supply, I.S. Barrier
Board,Backplane board, optional LCD Board with glass endcap)
B. Intrinsically-safe base enclosure includes Acquisition Module
C. Meter - body and band shrouds for transducers and cable assemblies
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12 Rosemount 3812 Liquid Ultrasonic Flow Meter

Figure 1-6: Remote mount electronics assembly with clamped band shrouds
A. Explosion-proof transmitter enclosure (CPU Module, Power Supply, I.S. Barrier
Board,Backplane board, and optional LCD Board with glass endcap)
B. Intrinsically-safe base enclosure includes Acquisition Module
C. Meter - body and band shrouds for transducers and cable assemblies
Figure 1-7: Remote mount electronics assembly with split shrouds
A. Explosion-proof transmitter enclosure (CPU Module, Power Supply, I.S. Barrier
Board Backplane board, optional LCD Board with glass endcap)
B. Intrinsically-safe base enclosure includes Acquisition Module
C. Acquisition cable conduit
D. Junction box
E. Meter - body and split shrouds for transducer and cable assemblies
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Figure 1-8: Optional local display and glass endcap
The Rosemount 3812 Liquid Ultrasonic Flow Meter is a two-path (four
transducers) in-line meter designed to measure the difference in signal transit
time with and against the flow across one or more measurement path(s). A signal
transmitted in the flow direction travels faster than one transmitted against the
flow direction. Each measurement path is defined by a transducer pair in which
each transducer alternately acts as transmitter and receiver. The meter uses
transit time measurements and transducer location information to calculate the
mean velocity.
Computer simulations of various velocity profiles demonstrate that multiple
measurement paths provide an optimum solution for measuring asymmetric
flow. The Rosemount 3812 Liquid Ultrasonic Flow Meter utilizes two cross-bore,
parallel-plane measurement paths, offers a high degree of repeatability, bi-
directional measurement and superior low-flow capabilities without the
compromises associated with conventional technologies.
The Rosemount 3812 Liquid Ultrasonic Flow Meter’s U.L. safety listing is
accomplished through the combination of an explosion-proof Transmitter
Electronics Enclosure that houses the CPU Module, Power Supply board, I.S.
Barrier board, Backplane board and optional LCD Display board.
Note
The optional LCD Display requires firmware v1.04 and Uboot version, January 31,
2013.
The Base Electronics Enclosure is intrinsically safe and houses the Acquisition
Module, the acquisition cable and wiring. The Intrinsically safe transducers and
cable assemblies are designed for Class 1, Division 1, Groups C and D areas
without need of further protection when installed in accordance with the field
wiring diagram (refer to Rosemount drawing DMC-004936, see Engineering
Drawings and Safety conditions).
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1.7 Meter specifications
CAUTION
ESCAPING FLUIDS HAZARD
The purchaser of the meter is responsible for the selection of Rosemount
components/seals and materials compatible with the chemical properties of the
measurement fluid.
Failure to select suitable meter components/seals may cause escaping fluids,
resulting in injury or equipment damage.
Consult your Emerson Flow service representative to ensure you purchase the
correct components and seals for your application.
Table 1-2: Meter specifications
Liquid Ultrasonic Flow Meter specifications
Meter type Number of paths
•Two path (four transducer) chordal
design
Enclosure materials •ASTM B26 Gr A356.0 T6 Aluminum
—Chromate conversion coated with a
polyurethane enamel
•ASTM A351 Gr CF8M Stainless Steel
—Passivated
Ultrasonic type •Transit-time based measurement
•Spool piece with integral mount
transducers
Meter Performance
Linearity •± 0.30% of measured value over a 10:1
turndown (40 to 4 ft/s; 12.2 to 1.2 m/s)
Repeatability •±0.10% of reading in the specified
velocity range
Velocity range •40.0 ft/s (12.2 m/s) (nominal) to 2.0 ft/s
(0.6 m/s)
•48 fps (14.3 m/s) (over-range)
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Table 1-2: Meter specifications (continued)
Liquid Ultrasonic Flow Meter specifications
Body and Flange Pressure rating range U.S. Customary Units sizes - 2, 3, 4, 6, 8, 10,
12, 14, 16, 18, 20, 24, 28, 30, and 36 (in)
•ANSI pressure classes 150 and 300, 600,
900 (per ANSI B16.5)
•Carbon Steel
•316 Stainless Steel
Metric Units sizes
•DN 50, 75, 100, 150, 200, 250, 300, 350,
400, 450, 500, 600, 700, 750, and 900
•PN 20, 50, 100, 150
•Carbon Steel
•316 Stainless Steel
Meter bore
•Schedule 40 and Schedule 80
Maximum Pressures
•Dependent on operating temperature
Flange types ANSI classes - 150, 300, 600 and 900
•Raised face or RTJ
Specific Gravity 0.35 to 1.50
Accuracy Limits Accuracy limits typically are:
•± 2% without a flow calibration, ± 0.3%
with flow calibration
Minimum operating pressure •0 psig
•0 barg
Electronic specifications
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Table 1-2: Meter specifications (continued)
Liquid Ultrasonic Flow Meter specifications
Power Meter
•10.4 VDC to 36 VDC measured at the
meter terminals
•11 W maximum power consumption
Serial cable
•Belden #9940 or equivalent (22 gauge)
—Capacitance (pF/m) 121.397
(conductor to conductor)
—Capacitance (pF/m) 219.827
(conductor to other conductor and
shield)
—Resistance (DC) DCR @ 20 °C
(Ohm/km) 48.2307
—Nominal Outer shield resistance -
DCR @ 20 °C (Ohm/km) 16.405
—Operating voltage - 300 V RMS (UL
AWM Style 2464)
—Current 2.4 Amps per conductor @
25 °C (recommended)
Ethernet cable
•Cat-5 Standard 100 Mbps
Frequency (see Table 3-1)
•22 AWG wire characteristics are as
follows:
—Capacitance = 20 pF/ft or 20 nF/1000
ft (between two wires)
—Resistance = 0.0168 Ohms/ft or 16.8
Ohms/1000 ft
—Pull-up voltage is 24 VDC
Temperature flameproof transmitter
electronic enclosure and base electronic
enclosure
•Ambient: -40 °F to 140 °F (-40 °C to 60
°C)
•Storage: -58 °F to 185 °F (-50 °C to 85 °C)
Note
The transmitter electronics enclosure and
base enclosure must be remote mounted if
the operating temperature exceeds 140 °F
(60 °C).
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Table 1-2: Meter specifications (continued)
Liquid Ultrasonic Flow Meter specifications
Transducers •LT-10 and LT-11 Operating temperature
range with NBR O-rings -58 °F to +275 °F
(-50 °C to 135 °C)
•LT-10 and LT-11 Operating temperature
range with FKM O-rings -40 °F to +302 °F
(-40 °C to +150 °C)
Note
The process temperature must not exceed
the operating temperature range of the
transducers.
Note
LT-10 transducers are designed for 4 inch to
10 inch meters. LT-11 transducers are
designed for 12 inch and larger meters.
Note
The ultrasonic transducers are not intended
for use across boundary walls of different
hazardous area classifications. The
transmitter electronics cannot be remote
mounted from a Division 1 classification to
a Division 2 area to meet an area
classification.
Acquisition Cable •Total cable length between the
Acquisition Module and ultrasonic
transducers must not exceed 15 feet (4.7
meters) when using the remote mount
option (see Figure 1-7).
Communications specifications
Connectivity protocols One serial RS-232/RS-485 port (115 kbps
baud rate) (Modbus RTU/ASCII)
•(1) Serial Port A (RS-232/RS-485 Full
Duplex/RS-485 Half Duplex)
One Ethernet Port (TCP/IP) 100 BaseT
•Modbus TCP
Device compatibility FloBoss 103, FloBoss S600 flow computer,
ROC 107
Digital, analog, and frequency inputs
Digital Input(s) (Selectable) (1) Single polarity (for flow calibration
gating - contact closure)
•Single input for starting and stopping
•Four pulse configurations available
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Table 1-2: Meter specifications (continued)
Liquid Ultrasonic Flow Meter specifications
Analog Input(s) (2) 4-20 mA
•AI-1 Temperature
•AI-2 Pressure
Note
The analog-to-digital conversion accuracy is
within ±0.05% of full scale over the
operating temperature range.
Note
AI-1 and AI-2 are electronically isolated and
operate in sink mode. The input contains a
series resistance so HART® Communicators
can be connected to configure sensors.
A 24 Volt DC power supply is available to
provide power to the sensors.
Digital, analog, and frequency outputs
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Table 1-2: Meter specifications (continued)
Liquid Ultrasonic Flow Meter specifications
Frequency/Digital Output(s) The meter has user-configurable selections
for either a frequency output or Digital
status (FODO) (Also see Frequency/Digital
outputs.)
(3) Frequency/Digital Outputs
•FODO1 (four possible output
configurations)
•FODO2 (eight possible output
configurations)
•FODO3 (eight possible output
configurations)
Frequency or Digital Output parameter
pairs (see Frequency/Digital outputs.)
Frequency or Digital Outputs (FODO 1)
source selections:
•(FO1A, DO1A, FO1B, DO1B)
Frequency or Digital Outputs (FODO 2)
source selections
•(FO1A, DO1A, FO1B, DO1B, FO2A, DO2A,
FO2B, DO2B)
Frequency or Digital Outputs (FODO 3)
source selections
•(FO1A, DO1A, FO1B, DO1B, FO2A, DO2A,
FO2B, DO2B)
Mode options:
•Open Collector (requires external
excitation supply voltage and pull-up
resistor)
•TTL (internally powered by the meter 0-5
VDC signal)
Channel B Phase options:
•Lag forward, Lead reverse (Phase B lags
Phase A while reporting forward flow,
leads Phase A while reporting reverse
flow)
•Lead forward, Lag reverse (Phase B
leads Phase A while reporting forward
flow, lags Phase A while reporting
reverse flow)
Phase A and Phase B output (based on flow
direction)
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