Emerson Rosemount 2110 User manual

Reference Manual
00809-0100-4029, Rev CA
March 2018
Rosemount™2110 Level Switch
Vibrating Fork

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Reference Manual
00809-0100-4029, Rev CA
Title Page
March 2018
Title Page
Rosemount™2110 Level Switch
Vibrating Fork
Read this manual before working with the product. For personal and system safety, and for
optimum product performance, make sure you thoroughly understand the contents before
installing, using, or maintaining this product.
For technical assistance, contacts are listed below:
Customer Central
Technical support, quoting, and order-related questions.
United States - 1-800-999-9307 (7:00 am to 7:00 pm CST)
Asia Pacific- 65 777 8211
Europe/ Middle East/ Africa - 49 (8153) 9390
North American Response Center
Equipment service needs.
1-800-654-7768 (24 hours—includes Canada)
Outside of these areas, contact your local Emerson™representative.
The products described in this document are NOT designed for nuclear-qualified applications.
Using non-nuclear qualified products in applications that require nuclear-qualified hardware or
products may cause inaccurate readings.
For information on Rosemount nuclear-qualified products, contact your local Emerson Sales
Representative.

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Contents
March 2018
Contents
1Section 1: Introduction
1.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Manual overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Introduction to the Rosemount™2110. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3.1 Features list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3.2 Measurement principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3.3 Short fork technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3.4 Special features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Product recycling and disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2Section 2: Installation
2.1 Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Considerations before installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1 Environmental considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.2 Application considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.3 Installation considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.3 Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
2.3.1 Process connection seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
2.3.2 Correct fork alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
2.3.3 Mounting the threaded versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.3.4 Mounting the Tri Clamp versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
2.4 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2.4.1 Prepare the electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2.4.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2.5 LED Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
3Section 3: Troubleshooting
3.1 Magnetic test point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.2 Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.3 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.5 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.6 Service support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Contents

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AAppendix A: Reference Data
A.1 Product Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
A.2 Ordering Information, Specifications, and Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Reference Manual
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Introduction
March 2018
1
Introduction
Section 1 Introduction
1.1 Safety messages
Procedures and instructions in this manual may require special precautions to ensure the safety of the
personnel performing the operations. Information that raises potential safety issues is indicated by a
caution symbol ( ). The external hot surface symbol ( ) is used when a surface is hot and care must be
taken to avoid possible burns. If there is a risk of an electrical shock, the ( ) symbol is used. Refer to the
safety messages listed at the beginning of each section before performing an operation preceded by this
symbol.
Failure to follow these installation guidelines could result in death or serious injury.
Protection afforded by compliance to EN61010-1 may be impaired if the equipment is not
used as specified.
The Rosemount™2110 must be installed, connected, commissioned, operated, and
maintained by suitably qualified personnel only, observing any national and local requirements
that may apply.
Ensure the wiring is suitable for the electrical current and the insulation is suitable for the
voltage, temperature, and environment.
Use the equipment only as specified in this manual. Failure to do so may impair the protection
provided by the equipment.
Any substitution of non-recognized parts may jeopardize safety and is under no circumstances
allowed.
Review the product approvals for any restrictions associated with an installation.
See “Reference Data” on page 29 for where to find the latest information.
Verify that the operating environment of the level switch is not a hazardous area location.
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 Rosemount 2110 is in
service.
Electrical shock could cause death or serious injury.
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.
Use extreme caution when making contact with the leads and terminals.
Make sure that power to the Rosemount 2110 is off while making connections.

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Introduction
1.2 Manual overview
This manual provides information on installing, operating, and maintaining all versions of the
Rosemount 2110 Vibrating Fork Liquid Level Switch (“level switch”).
Section 2: Installation provides instruction on mechanical and electrical installation procedures.
Section 3: Troubleshooting contains instructions about using the magnetic test point, as well as
inspection, basic maintenance, and troubleshooting information.
Appendix A: Reference Data contains instructions on how to find the latest product certifications,
specifications, dimension drawings, and ordering information on the Emerson.com/Rosemount site.
Note
Refer to the Rosemount 2110 Quick Start Guide for instruction on hygienic installation of a level switch
with a 51 mm Tri Clamp fitting.
1.3 Introduction to the Rosemount 2110
The Rosemount 2110 is a liquid point level switch based on the vibrating short fork technology.
It is a compact switch with a rugged stainless steel body and forks for use in a wide range of liquid
applications. For most liquids, including coating and aerated liquids and slurries, the function is virtually
unaffected by flow, turbulence, bubbles, foam, vibration, or changing liquid properties.
1.3.1 Features list
Features include:
Stainless steel housing and plug/socket connection for fast- fit, high-volume users.
Compact and lightweight design for side, top, or bottom mounting.
The industry standard DIN 43650 plug/socket is used for a fast connection. The polarity insensitivity
and short circuit protection make electrical hook-up safe and easy.
Designed for operation in temperatures from –40 to 302 °F (–40 to 150 °C).
Economical 3/4 - or 1-in. threaded process connections for mounting in pipes or tanks, or Tri Clamp
mounting for food industry.
Direct load switching (suits all supplies) or PNP output for direct interface to PLCs.
“Fast drip” fork design gives quick response time.
‘Heartbeat’ LED gives an instant visual indication that the level switch is operational.
Optimized fork shape for hand polishing to meet hygienic requirements.
No moving parts or crevices (means virtually no maintenance).
Magnetic test point for easy functional test.
This combination of features makes the Rosemount 2110 an ideal choice for a wide variety of
applications. The level switch is for use in non-hazardous (safe) area installations only.
See Figure 1-1 on page 3 for application examples.

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Figure 1-1. Rosemount 2110 Features
A. Industry standard DIN 43650 plug/socket
B. Stainless steel housing with magnetic test point
C. Hexagonal nut for tightening a threaded process connection, and for fork orientation
D. Threaded and Tri Clamp process connection options
E. ‘Fast drip’ fork design
F. Visible ‘heartbeat’ LED
1.3.2 Measurement principle
The Rosemount 2110 is designed to use the principle of a tuning fork. A piezo-electric crystal oscillates
the forks at their natural frequency. Changes to this frequency are continuously monitored. The
frequency of the vibrating fork sensor changes depending on the medium in which it is immersed. The
denser the liquid, the lower the frequency.
When used as a low level alarm, the liquid in the tank or pipe drains down past the fork, causing a change
of natural frequency that is detected by the electronics and switches the output state.
When the Rosemount 2110 is used as a high level alarm, the liquid rises in the tank or pipe making
contact with the fork and causing the output state to switch.
1.3.3 Short fork technology
The natural frequency (~1300Hz) of the fork avoids interference from plant vibration which may cause
false switching. It also gives short fork length for minimal intrusion into vessel and pipe. By using Short
Fork Technology and through extensive research, Emerson™has maximized the design and operational
effectiveness of the Rosemount 2110 making it suitable for practically all liquids, including coating
liquids, aerated liquids, and slurries.
A
B
C
D
E
F

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1.3.4 Special features
Fork design
The “fast drip” fork design draws liquid away from the fork tips when mounted horizontally, and together
with a short switching delay, allows the Rosemount 2110 to react quickly and with greater sensitivity to
density variations.
Heartbeat LED
The Rosemount 2110 has a ‘heartbeat’ LED indicating it is operating, and can be seen at all times.
The LED flashes when the switch output is ‘off’ and is constantly lit when 'on'.
Magnetic test point
A magnetic test-point is located on the side of the housing, allowing the user to perform a functional test
of the Rosemount 2110 and the system connected to it. Holding a magnet to the test-point causes the
output to change state.
Figure 1-2. Rosemount 2110 Application Examples
Overfill protection
Spillage caused by overfilling can be hazardous to people and the environment, resulting in
lost product and potentially high clean up costs.
High and low level alarm
Maximum and minimum level detection in tanks containing different types of liquids are
ideal applications. The Rosemount 2110 operates continuously across the process
temperature range of –40 to 302 °F (–40 to 150 °C) and operating pressures of up to 1450
psig (100 barg), making it perfect for use as a high or low level alarm. It is common practice
to have an independent high level alarm switch as a backup to an installed level device in
case of primary failure.

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1.4 Product recycling and disposal
Recycling of equipment and packaging should be taken into consideration. The product and packaging
should be disposed of in accordance with local and national legislation.
Pump protection or empty pipe detection
Short forks require minimum intrusion wetside and allow simple low cost installation at any
angle into pipes or vessels. Because the Rosemount 2110 projects only 2-in. (50 mm)
(depending on connection type), it can be installed in small diameter pipes. By selecting
the option of direct load switching electronics, it is ideal for reliable pump control and can
be used to protect against pumps running dry.
Pump control
Many processes have batching and header tanks with the need to control a pump to
maintain levels between set points. The Rosemount 2110 is ideal for these situations, since
these tanks are often manufactured from thin wall materials and cannot support the
weight of heavy instrumentation.
Leak detection
Flanges, gaskets, seals, corrosive liquids all have the potential to leak at the most
inconvenient times. Many users site tanks and vessels above trays, or in containments to
prevent any liquids from escaping. A level switch can quickly and accurately detect any
leakage, thereby eliminating costs.
Hygienic applications
The highly polished fork option provides a surface finish (Ra) better than
0.8 μm. The Rosemount 2110 meets the principle design criteria of the most stringent
hygienic requirements used in food and beverage, and pharmaceutical applications.
Manufactured in stainless steel, it is robust enough to easily withstand steam cleaning (CIP)
routines at temperatures up to 302 °F (150 °C).

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Section 2 Installation
Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7
Considerations before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 8
Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13
Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18
LED Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 24
2.1 Safety messages
Failure to follow these installation guidelines could result in death or serious injury.
The Rosemount™2110 Level Switch (“level switch”) must be installed, connected,
commissioned, operated, and maintained by suitably qualified personnel only, observing any
national and local requirements that may apply.
Ensure the wiring is suitable for the electrical current and the insulation is suitable for the voltage,
temperature, and environment.
Use the equipment only as specified in this manual. Failure to do so may impair the protection
provided by the equipment.
Any substitution of non-recognized parts may jeopardize safety and is under no circumstances
allowed.
Verify that the operating environment of the level switch is not a hazardous area location.
Failure to comply with the following requirements will result in the invalidation of the
product safety certification.
Check for risk of process medium build-up on the level switch forks. Avoid situations where
drying and coating products may create an excessive build-up (see Figure 2-2 on page 9) or
implement preventative maintenance programs to ensure the build-up is not enough to impair
performance.
Ensure there is no risk of 'bridging' of the level switch forks. Examples of products that create
'bridging' of the forks are dense paper slurries and bitumen.
External surface may be hot.
Care must be taken to avoid possible burns.
Process leaks may cause harm or result in death.
Install and tighten process connectors before applying pressure.
Do not attempt to loosen or remove process connectors while the level switch is in service.
Electrical shock could cause death or serious injury.
If the 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.
Use extreme caution when making contact with the leads and terminals.
Make sure that power to the level switch is off while making connections.

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2.2 Considerations before installation
Important
Emerson™is not in a position to evaluate or guarantee the compatibility of the process fluid or other
process parameters with the product, options, configuration or materials of construction selected.
2.2.1 Environmental considerations
The Rosemount 2110 Level Switch is a wired point level device for use in open or closed tanks, and
pipework. The installation must be in a non-hazardous (safe) area.
All versions of the level switch are weatherproof and protected against the ingress of dust, but must be
protected from flooding.
Hygienically-certified and compliant versions have specific hygienic installation instructions in the
Rosemount 2110 Quick Start Guide (see Emerson.com/Rosemount for other language versions).
Avoid installing the level switch near heat sources.
Figure 2-1. Environmental Considerations
2.2.2 Application considerations
For most liquids, including coating, aerated liquids and slurries, the function is virtually unaffected by
flow, turbulence, bubbles, foam, vibration, solid particles, build-up, or properties of the liquid.
The Rosemount 2110 Level Switch (“level switch”) is available for installation in non-hazardous (safe)
areas and process temperatures up to 302 °F (150 °C). It can be mounted in any position in the tank or
pipe using the 3/4 - or 1-in. threaded or Tri Clamp fitting.
See Figure 1-2 on page 4 for application examples.
OKOK

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Application limits
Check for risk of process medium build-up on the level switch forks.
Avoid situations where a drying and coating process medium may create an excessive build-up
(see Figure 2-2 on page 9) or implement preventative maintenance programs to ensure the build-up is
not enough to impair performance.
Ensure there is no risk of ‘bridging’ of the level switch forks. Examples of products that can create
‘bridging’ of forks are dense paper slurries and bitumen.
Ensure the process is operating within the instrument operating temperature and pressure ranges
(see Appendix A: Reference Data).
Ensure the liquid viscosity is within the recommended viscosity range
(see Appendix A: Reference Data).
Examples of products with too high viscosity are chocolate syrup, ketchup, peanut butter and
bitumen; the level switch still operates with these products, but the drain time can be very long.
Check that the liquid density is higher than 37.5 lb/ft3(600 kg/m3). Examples of products with a too
low density include acetone, pentane, and hexane.
Liquid density affects the switching point e.g. dry-to-wet (see Figure 2-3 on page 10).
Check the solids content in the liquid.
As a guideline, the maximum solid particle diameter in the liquid is 0.2-in. (5 mm). Extra consideration
is needed when dealing with particles bigger than 0.2-in. (5 mm). Consult the factory for advice.
In almost all cases, the level switch is insensitive to foams (i.e. does not see the foam).
However, on rare occasions, some very dense foams may be seen as liquid; known examples of this are
found in ice-cream and orange juice manufacturing.
Figure 2-2. Avoid Product Build-up
OK

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Figure 2-3. Switching Point
SP: Switching point (H20)
HY: Switching hysteresis
Note
When mounted vertically, a low density medium has a switching point closer to the process connection.
A high density medium has a switching point closer to fork tip.
2.2.3 Installation considerations
Measurement accuracy is dependent upon the proper installation of the level switch.
Keep in mind the need for easy access, personnel safety, practical field calibration, and a suitable
environment for the level switch.
How to handle the level switch
Do not hold using the forks (Figure 2-4 on page 11).
Device identification
To identify the Rosemount 2110 version, see the label on the housing.
Mounting orientation
Mount the level switch at any angle that allows the liquid level to rise or flow through the fork gap
(Figure 2-7 and Figure 2-8 on page 14).
SP
HYSP
0.1 in.
(2.5 mm)
0.5 in.
(13 mm)
0.5 in.
(13 mm)

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Allow adequate space outside the tank or pipe
Mount the level switch in a position to allow easy access to the wiring terminals. Ensure there is sufficient
room for making electrical connections.
For dimensional drawings, see Appendix A: Reference Data for where to find the latest information.
Figure 2-4. Handling the Rosemount 2110
Figure 2-5. Do Not Modify the Rosemount 2110
OK

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Other recommendations
Always install in the normally “on” state
–High level recommendation is Dry = on (see Table 2-2 on page 20)
–Low level recommendation is Wet = on (see Table 2-2 on page 20).
Always ensure:
–The overall system is tested during commissioning by using the local magnetic test point
(Figure 3-1 on page 25).
–The forks do not come into contact with the tank wall, internal fittings, or any other obstructions.
–The installation does not create tank crevices around the forks where liquid may collect. This can
happen with high viscosity and high density liquids.
Avoid:
–Installing the level switch near to liquid entering the tank at the fill point.
–Heavy splashing on the fork.
Extra consideration is needed if the plant vibration is close to the 1300 Hz operating frequency of the
Rosemount 2110.

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2.3 Installation procedures
2.3.1 Process connection seals
Figure 2-6. Process Connection Seals
A. NPT or BSPT (R) thread
B. PTFE tape
C. Gasket
D. BSPP (G) thread
E. Tri Clamp
F. The Tri Clamp seal is supplied as in as accessory kit (see Appendix A: Reference Data for where to find the latest information).
B
A
E
C
EF
D

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2.3.2 Correct fork alignment
Pipe installation
Ensure the fork is correctly aligned by using the groove or notch as indicated in Figure 2-7.
Figure 2-7. Correct Fork Alignment for Pipe Installation
Tank installation
Figure 2-8. Correct Fork Alignment for Tank Installation
OK
Tri Clamp
Threaded
OKOK
OK
OK OK
Tri Clamp
Threaded