Emerson Rosemount 3107 Level, Rosemount 3108 Flow Quick Start Guide

Quick Start Guide

00825-0200-4840, Rev BC

August 2019

Rosemount™ 3107 Level and 3108 Flow
Transmitters

Ultrasonic

Quick Start Guide August 2019

Contents

About this guide...........................................................................................................................3

Overview of Rosemount 3107 and 3108.......................................................................................5

Considerations before you install................................................................................................. 8

Installation................................................................................................................................. 10

Connecting the transmitter........................................................................................................15

Configuration.............................................................................................................................17

Product Certifications.................................................................................................................31

2 Rosemount Ultrasonic 3107 Level and 3108 Flow Transmitters

August 2019 Quick Start Guide

1 About this guide

This installation guide provides basic guidelines for the Rosemount 3107
Level Transmitter and Rosemount 3108 Flow Transmitter. It does not
provide instructions for detailed configuration, diagnostics, maintenance,
service, troubleshooting, or installations. Refer to the Rosemount 3107 and
3108 Reference Manual for more instructions. Manuals are available
electronically on Emerson.com/Rosemount.

WARNING

Failure to follow these installation guidelines could result in death or
serious injury.

• The Rosemount 3107 and Rosemount 3108 are ultrasonic transmitters.

They must be installed, connected, commissioned, operated, and
maintained by suitably qualified personnel only, observing any national
and local requirements that may apply.

• Use the equipment only as specified. Failure to do so may impair the

protection provided by the equipment.

Explosions could result in death or serious injury.

• Installation of the transmitters in a hazardous environment must be in

accordance with the appropriate local, national, and international
standards, codes, and practices. Please review the Product Certifications
section for any restrictions associated with a safe installation.

• Before connecting a handheld communicator in an explosive

atmosphere, ensure the instruments are installed in accordance with
intrinsically safe or non-incendive field wiring practices.

• Verify that the operating atmosphere of the transmitter is consistent

with the appropriate hazardous locations certifications.

External surface may be hot. Care must be taken to avoid possible burns.

Process leaks could result in death or serious injury.

• Install and tighten process connectors before applying pressure.

• Do not attempt to loosen or remove process connectors while the

transmitter is in service.

Electrical shock could cause death or serious injury.

• Ensure that the transmitter is not powered when making connections.

• If the liquid level switch is installed in a high voltage environment and a

fault condition or installation error occurs, high voltage may be present
on leads and terminals.

Quick Start Guide 3

Quick Start Guide August 2019

WARNING

Physical access

Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or
unintentional and needs to be protected against.

Physical security is an important part of any security program and
fundamental to protecting your system. Restrict physical access by
unauthorized personnel to protect end users’ assets. This is true for all
systems used within the facility.

4 Rosemount Ultrasonic 3107 Level and 3108 Flow Transmitters

August 2019 Quick Start Guide

2 Overview of Rosemount 3107 and 3108

The Rosemount 3107 and 3108 are sealed 4–20 mA loop-powered liquid
level transmitters, specifically designed for use in waste water and effluent
treatment plant on aqueous applications.

These rugged UPVC transmitters are certified Intrinsically Safe for use in
Zone 0 areas, and factory fitted with up to 165 ft. (50 m) of two-core cable
for simple low cost installation in sumps, wet-wells and over open channel
flow structures.

The transmitter may be mounted in a hazardous area if powered from a
protected power supply. They can be connected directly to a plant control
system, or used with a Rosemount 3490 Series Control Unit for
programmable control functionality.

Theory of operation

Each transmitter is designed to be mounted above a liquid, and uses
ultrasonic pulses to continuously measure the distance to the liquid surface.
The microprocessor-controlled electronics calculates distance to the liquid
level from the time delay between the transmitting and receiving of signals.

When programmed with the bottom reference of the application – usually
the bottom of a tank – the transmitter will calculate the liquid depth (level),
and output the level (Figure 2-1) as a 4–20 mA signal and a digital HART
signal.

The Rosemount 3107 and 3108 can also calculate contents (volume) or
open channel flow, and then output the result as a 4–20 mA signal and a
digital HART signal.

Programming is achieved by remote communication using HART.

®

Quick Start Guide 5

Quick Start Guide August 2019

Figure 2-1: Typical Application

A. Rosemount 3108 Flow Transmitter
B. Rosemount 3490 Series Control Unit
C. 4–20 mA signal output

D. Relay

E. Pump
F. Transmitter Bottom Reference

G. 4–20 mA and HART signal input

Components of the transmitter

The transmitter has a housing containing advanced electronics to generate
ultrasonic pulses, process the resultant signals, and provide a 4–20 mA and
HART output.

There is a factory-fitted cable for the signal output and connecting an
external power supply. The Rosemount 3108 has a factory-fitted remote
temperature sensor.

6 Rosemount Ultrasonic 3107 Level and 3108 Flow Transmitters

E

A

D

D

C

B

August 2019 Quick Start Guide

Figure 2-2: Transmitter Components

A. Mounting bracket
B. Two-core cable
C. 1-in. mounting thread

D. UPVC wetted parts

E. Remote temperature sensor (Rosemount 3108 only)

Quick Start Guide 7

Quick Start Guide August 2019

3 Considerations before you install

Install the transmitter where it is protected from ultraviolet radiation to
prevent long-term degradation of the plastics used in its construction (e.g.
shrouded from direct sunlight).

Note

See also Product Certifications for special conditions for safe use.

General

• Installation must be carried out by suitably trained personnel in

accordance with the applicable code of practice.

• If the equipment is likely to come into contact with aggressive

substances, it is the responsibility of the user to take suitable precautions
that prevent it from being adversely affected, thus ensuring that the type
of protection is not compromised.

• Aggressive substances are acidic liquids or gases that may attack metals

or solvents that may affect polymeric materials.

• Suitable precautions are regular checks as part of routine inspections, or

establishing, from the material's data sheet, that it is resistant to specific
chemicals.

• The equipment should only be cleaned with a damp cloth; do not use

solvents.

• The transmitter is double insulated, and therefore protective earthing is

not required. However, the cable screen should be connected (see Figure

5-1).

• Note that if the equipment is used in a manner not specified by the

manufacturer, the protection afforded by the equipment may be
impaired.

• This transmitter is classified Type A in accordance with the European

EMC directive 2004/108/EC. To ensure electro-magnetic compatibility,
in any member state, it should not be installed in a residential area.

Note

It is not advisable to mount the transmitter in close proximity to a source of
electrical noise such as a variable-speed drive, or other high-powered
electrical device.

Environmental

The Rosemount 3107 and 3108 ultrasonic transmitters are Intrinsically Safe
(IS) approved for hazardous area installations.

8 Rosemount Ultrasonic 3107 Level and 3108 Flow Transmitters

OKOK OK

August 2019 Quick Start Guide

• The Rosemount 3107 is designed for open or closed tank installation. It is

weatherproof and protected against the ingress of dust

• The Rosemount 3108 is designed for open channel flow measurement. It

is weatherproof and protected against the ingress of dust

• Avoid installing the Rosemount 3107 and 3108 transmitters near heat

sources

Figure 3-1: Environmental Considerations

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Quick Start Guide August 2019

4 Installation

• Mount the transmitter above the liquid using the 1-in. threaded

connection provided, but no closer than 13.8 in. (0,35 m) to the surface.
The transmitter does not detect any liquid surface closer than 12 in. (0,3
m) to the transmitter face.

• The transmitter should be mounted vertically to ensure a good echo

from the liquid surface. The beam half angle of the transmitter is 6
degrees (Figure 4-2).

• Obstructions in the tank, or well, may generate echoes which can be

confused with the real liquid surface echo. Obstructions within the beam
angle generate strong false echoes. Wherever possible, the transmitter
should be positioned to avoid false echoes.

• To avoid detecting unwanted objects in the tank or well, it is advisable to

maintain a distance of at least 1.3-in (33.02 mm). from the center line of
the transmitter for every foot (11 cm per meter) range to the
obstruction. (See Figure 4-2).

• No false echoes are generated if the transmitter is located near the side

of the tank or well and the wall is smooth and free of protrusions.
However, there will still be a reduction in the echo size. It is
recommended that the transmitter be mounted no closer than 12 in.
(0,3 m) to the wall to avoid a large reduction in the echo size.

• If the transmitter is mounted in an enclosed tank with a domed top,

avoid mounting the transmitter in the center of the tank roof because
this could act as a parabolic reflector and create unwanted echoes.

• Avoid applications where heavy condensation could form on the

transmitter face.

• If the transmitter is mounted in a stand-off or nozzle, the transmitter

face should protrude at least 0.2 in. (5 mm) into the tank.

• If the transmitter is used in environments where direct sunlight can

cause high surface temperatures on exposed instruments, a sun-shade is
recommended.

4.1

10 Rosemount Ultrasonic 3107 Level and 3108 Flow Transmitters

Mounting the transmitter above the liquid surface

A one-inch threaded process connection is provided to mount the
transmitter (Figure 4-1). The thread form is either BSPP (G1) or NPT, and is
marked below the mounting thread.

Mounting bracket

The transmitter is supplied with a purpose made 316 Stainless Steel
mounting bracket (Figure 4-1), which should be used to mount the

August 2019 Quick Start Guide

transmitter over the liquid surface. The bracket is designed to fit over the
threaded neck of the transmitter and is retained by a locknut.

Use a chain or wire through the hole provided in the bracket, which is shaped
to ensure that the transmitter will hang perpendicular to the water surface.
Never suspend the transmitter by the cable. Check that the material of the
chain or wire is corrosion resistant to the liquids and any vapors present.

The bracket may be bolted to a suitable crossmember above the liquid
surface. Ensure the transmitter is perpendicular to the surface to maximize
the return echo size.

Figure 4-1: Mounting Thread and Supplied Bracket

A. 1-in. threaded process connection

Note

To help with alignment, the echo size (signal strength) can be indicated on
the Rosemount 3490 Series Control Unit or a Field Communicator.

Flange mounting

The instrument (accessory) flanges supplied by Emerson are manufactured
from PVC and are a full face design. Care must be taken when installing to a
raised face mating flange on the tank or vessel to prevent distortion of the
PVC flange by overtightening the bolts. See Product Data Sheet for a list of
all accessories and their part numbers.

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Quick Start Guide August 2019

Figure 4-2: Recommended Mounting Position

A. Transmitter is mounted vertically (maximum deviation of 3°).
B. 6° beam half angle.
C. 1.3 in./ft. (11 cm/m). Minimum of 12 in. (0.3 m).

Mounting from a conduit

The transmitters can be mounted from a conduit using the optional adaptor
accessory. See Product Data Sheet for a list of all accessories and their part
numbers.

4.2

12 Rosemount Ultrasonic 3107 Level and 3108 Flow Transmitters

Open channel flow installations

Mount an ultrasonic transmitter over an area of clear liquid. Avoid mounting
the transmitter directly over any inlet stream. Never suspend the transmitter
by the cable.

The positioning is critical, and should be the correct distance upstream from
the flow structure as stated in the relevant standard for your country. For
example, in the ISO standards, the distance should be four to five times the
maximum height of the water (Hmax) for a thin plate weir, or three to four
times Hmax for a flume. For optimum accuracy, position the transmitter’s
front face at a height equal to the sum of the maximum flow depth plus the
transmitter deadband of 12.2 in. (300 mm) plus an extra 2 in. (50 mm).

It is important that the bottom reference of the transmitter should be
related to the datum of the primary measuring device (Figure 4-4).

When setting the bottom reference on a ‘V’- notch weir, it is important the
true invert is used (Figure 4-5) and not the meniscus level.