Rosemount 2120 User manual

Reference Manual
00809-0100-4030, Rev DA
June 2007
www.rosemount.com
Rosemount 2120
Vibrating Fork Liquid Level Switch

www.rosemount.com
Reference Manual
00809-0100-4030, Rev DA
June 2007 Rosemount 2120
IMPORTANT NOTICE
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.
The United States has two toll-free assistance numbers and one International number.
Customer Central
1-800-999-9307 (7:00 a.m. to 7:00 P.M. CST)
International
1-[phone]
National Response Center
1-800-654-7768 (24 hours a day)
Equipment service needs
CAUTION
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 Emerson Process Management nuclear-qualified products, contact
your local Emerson Process Management Sales Representative.
CAUTION
Rosemount pursues a policy of continuous development and product improvement. The
specification in this document may therefore be changed without notice. To the best of our
knowledge, the information contained in this document is accurate and Rosemount
cannot be held responsible for any errors, omissions or other misinformation contained
herein. No part of this document may be photocopied or reproduced without the prior
written consent of Rosemount.
2120 Vibrating Fork Liquid Level Switch

Reference Manual
00809-0100-4030, Rev DA
June 2007
Rosemount 2120

www.rosemount.com
Reference Manual
00809-0100-4030, Rev DA
June 2007 Rosemount 2120
Table of Contents
SECTION 1
Introduction
Switch Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Short Fork Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Rosemount 2120 Application and Mounting Examples. . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Overfill Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Limit Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Pipe Installation (Pump Protection) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
High and Low Level Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Hygienic Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Application Considerations: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Handling the 2120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Device Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
Installation Considerations and Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
Switchpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
Service Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
SECTION 2
Installation
Safety Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Correct Fork Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Pipe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Vessel Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
Cable Gland Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
Set Mode Switch / Switching Time Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
LED Indication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
2120 Direct Load Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
2120 PNP/PLC Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
2120 Relay Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
2120 Intrinsically Safe NAMUR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-13

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SECTION 3
Service & Troubleshooting
Magnetic Test Point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
2120 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Replacement and Calibration of Electronic (PCB) Cassettes . . . . . . . . . . . . . . . . . . . . . .3-4
Replacement Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
To replace the cassette, do the following: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Calibration Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
APPENDIX A
Reference Data
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Functional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Electrical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Dimensional Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Threaded Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Flange Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Hygienic Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Spare Parts and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-11
APPENDIX B
Product Certifications
Ordinary Location Certification for FM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Ordinary Location Certification for CSA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
European Directive Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
ATEX Directive (94/9/EC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Pressure Equipment Directive (PED) (97/23/EC). . . . . . . . . . . . . . . . . . . . . . . . B-1
L.V. Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Electro Magnetic Compatibility (EMC) Directive. . . . . . . . . . . . . . . . . . . . . . . . . B-1
Vibration Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
CE-mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Overfill protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Approved Manufacturing Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Hazardous Locations Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
North American and Canadian Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Factory Mutual (FM) Explosion Proof Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Canadian Standards Association (CSA) Explosion Proof Approval . . . . . . . . . . . . . B-2
Instructions specific to hazardous area installations . . . . . . . . . . . . . . . . . . . . . B-2
Factory Mutual (FM) Intrinsically Safe Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
Canadian Standards Association (CSA) Intrinsically Safe Approval . . . . . . . . . . . . B-5

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Canadian Standards Association (CSA) Non-Incendive Approval . . . . . . . . . . . . . . B-5
Instructions specific to hazardous (classified locations) area installations. . . . . B-5
European Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10
ATEX Flame Proof Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10
Instructions specific to hazardous area installations . . . . . . . . . . . . . . . . . . . . B-10
(Reference European ATEX Directive 94/9/EC, Annex II, 1.0.6.) . . . . . . . . . . B-10
ATEX Intrinsically Safe Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12
Instructions specific to hazardous area installations . . . . . . . . . . . . . . . . . . . . B-12
IECEx Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14
IECEx Flame Proof Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14
Instructions specific to hazardous area installations . . . . . . . . . . . . . . . . . . . . B-14
IECEx Intrinsically Safe Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-16
Instructions specific to hazardous area installations . . . . . . . . . . . . . . . . . . . . B-16
National Supervision and Inspection Centre (NEPSI) Approvals . . . . . . . . . . . . . . . . . B-18
NEPSI Explosion Proof Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-18

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www.rosemount.com
Reference Manual
00809-0100-4030, Rev DA
June 2007 Rosemount 2120
Switch Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
Rosemount 2120 Application and Mounting Examples . . . . . . . . . . . . . page 1-2
Handling the 2120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-4
Device Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-5
Installation Considerations and Recommendations . . . . . . . . . . . . . . . . page 1-6
Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-8
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 award 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 (2001) may be impaired if the
equipment is not used as specified.
• The Rosemount 2120 is a liquid level switch. It 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.
External Surface may be hot.
• Care must be taken to avoid possible burns.
Process leaks could result in death or serious injury.
• Do not remove the level switch while in operation. Removing while in operation may
cause process fluid leaks.
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 switch leads and terminals.
• Use extreme caution when making contact with the leads and terminals.
SECTION 1INTRODUCTION

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Switch Overview
The Rosemount 2120 is a liquid point level switch based on the vibrating short fork
technology making it suitable for virtually all liquid applications. Complete range of process
connections, wide choice of housing and wetted parts materials, four different switching
functions, extended fork lengths, hazardous area and overfill approvals makes it
configurable to almost all requirements.
Short Fork Technology
The natural frequency (~1300Hz) of the fork is chosen to avoid interference from plant
vibration which may cause false switching. This also gives short fork length for minimal
intrusion into vessel and pipe. Using Short Fork Technology, the Rosemount 2120 is
designed for use in virtually all liquid applications. Extensive research has maximized the
operational effectiveness of the fork design making it suitable for almost all liquids, including
coating liquids (avoid bridging of forks), aerated liquids, and slurries.
Rosemount 2120 Application and Mounting Examples
For most liquids including coating and aerated liquids and slurries, the function is virtually
unaffected by flow, turbulence, bubbles, foam, vibration, solid particles, build-up (avoid
bridging of forks) or properties of the liquid. For use in Hazardous (IS or Exd) or safe area
and process temperatures up to 302°F (150°C).
Mount in any position in the tank or pipe. Mounting is by a wide range of threaded,
flanged, or hygienic connection.
Any substitution of non-recognized parts may jeopardize safety and is under no
circumstances allowed.
‘Fast drip’
fork design
Mode switch,
adjustable time
delay
Visible heartbeat
LED
Wetted material in SST, Hastelloy or
Halar/PFA coating
Short fork length or
extensions up to 118-in. (3 m)
IP66/67 or NEMA4X
housings in plastic,
aluminum or 316 SST
Two cable/ conduit
entries
Direct Load, Relay PLC/PNP,
or IS NAMUR electronics
Threaded, Flanged, or
Hygienic Connections
Magnetic test
point
21210/2120 top off.tif

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1-3
Overfill Protection
Spillage caused by overfilling can be hazardous to people and the
environment, resulting in lost product, and clean up costs. The 2120 is a
limit level switch with a built-in visible ‘heartbeat LED’ used to signal overfill
at any time.
Limit Detection
Often batch processing tanks contain stirrers/agitators to ensure mixing
and product ‘fluidity’. The standard user selectable time delay ranging from
0.3 to 30 seconds virtually eliminates the risk of false switching due to
splashing caused by stirrers/agitators.
Pipe Installation (Pump Protection)
Short forks mean minimum intrusion wetside and allow simple low cost
installation at any angle into your pipes or vessels. With the fork projecting
only 2-in. (50 mm) (dependent on connection type), the 2120 can be
installed in even small diameter pipes. By selecting the option of direct load
switching electronics, the 2120 is ideal for reliable pump control and can be
used to protect against pumps running dry.
High and Low Level Alarm
Maximum and minimum level detection in tanks containing many different
types of liquids are an ideal application for the 2120. The robust 2120
operates continuously at temperatures up to 302°F (150°C) and operating
pressure up to 1450 psig (100 barg) making it perfect for use as a high or
low level alarm.
Hygienic Applications
With the option of highly polished forks providing a surface finish (Ra)
better than 0.8μm, the 2120 meets the principle design criteria of the most
stringent hygienic requirements used in food and beverage, and
pharmaceutical applications. Manufactured in stainless steel the 2120 is
robust enough to easily withstand steam cleaning (CIP) routines at
temperatures up to 302°F (150°C).

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1-4
Application Considerations:
• Ensure liquid is inside the temperature and pressure ranges (see specifications).
• Check that the liquid is inside recommended viscosity range 0.2 to 10,000 cP.
• Examples of products with too high of viscosity are chocolate syrup, ketchup, peanut
butter and bitumen. The switch will still detect these products but the drain time can be
very long.
• Check that the liquid density is above 37.5 lb/ft3(600 kg/m3).
• Examples of products with too low of density are acetone, pentane and hexane.
• Check for risk of build-up on the forks.
• Avoid situations where drying and coating products may create excessive build-up.
• Ensure no risk of bridging the forks.
• If coating, bridging may occur ensure the Halar/PFA coated version is used to reduce
the risk of build-up.
• Examples of products that can create bridging of forks are dense paper slurries and
bitumen.
• Check the solids content in the liquid.
• Problems may occur if product coats and dries causing caking.
• As a guideline 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 factory.
• Foam
• In almost all cases the 2120 is insensitive to foams (do not see the foam as a liquid).
• However in rare occasions some very dense foams may be seen as liquid, known
example of this is found in ice-cream and orange juice manufacturing.
Handling the 2120
Figure 1-1. Do not hold the 2120 by forks. Figure 1-2. Do not alter the 2120 forks in any way.
2120/fig1.jpg
2120/fig2.jpg

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Device Identification
See Appendix B: Product Certifications for specific product approvals.
2120 Vibrating Fork Level Switch
www.rosemount.com
DIR E CT L OAD S WITCHING
99500200
www .rosemount.com
MAGNETIC
TEST
POINT
20 - 264V ac
50 - 60Hz
20 - 60Vdc
Output Rating:
Load 20 - 500mA
~
Supply
2120##############
2120/2120_24aa.eps

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Installation Considerations and Recommendations
Before you install the Rosemount 2120 Level Switch, consider specific installation
recommendations and mounting requirements.
• Install in any orientation in tank containing liquid.
• Always install in the normally “on” state. (See “Electrical Installation” on page 2-7)
• For high level the recommendation is Dry = on.
• For low level the recommendation is Wet = on.
• Always ensure the system is tested by using the local magnetic test point during
commissioning. (See “Magnetic Test Point” on page 3-1)
• Ensure sufficient room for mounting and electrical connection (See “Dimensional
Drawings” on page A-5 for switch dimensions.)
Figure 1-3. Ensure Adequate Space Outside Tank
• Ensure that the forks do not come into contact with the tank wall or any internal fittings
or obstructions.
• Avoid installing the 2120 where it will be exposed to liquid entering the tank at the fill
point.
• Avoid heavy splashing on the forks.
• Raising the time delay reduces accidental switching caused by splashing.
• Avoid product buildup.
• Ensure no risk of bridging the forks.
• Ensure there is sufficient distance between build-up on the tank wall and the fork.
• Ensure installation do not create tank crevices around the forks where liquid may
collect (important high viscosity and high density liquids).
2120/2120_28aa.eps

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Figure 1-4. Example of ok and not ok build-up on tank wall.
• Extra consideration is needed if the plant vibration is close to the 1300 Hz operating
frequency of the 2120
• Avoid Long Fork Length and Vibration without Supporting the Fork
Figure 1-5. Support fork if high dynamic loads.
2120/fig9.eps
2120/2120_29aa.eps
3.28 ft
(1.0 m)
3.28 ft
(1.0 m)
>3.28 ft
(1.0 m)

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Switchpoint
Service Support
To expedite the return process outside of the United States, contact the nearest Rosemount
representative.
Within the United States, call the Rosemount National Response Center using the
1-800-654-RSMT (7768) toll-free number. This center, available 24 hours a day, will assist
you with any needed information or materials.
The center will ask for product model and serial numbers, and will provide a Return Material
Authorization (RMA) number. The center will also ask for the process material to which the
product was last exposed.
Rosemount National Response Center representatives will explain the additional
information and procedures necessary to return goods exposed to hazardous substance
can avoid injury if they are informed of and understand the hazard. If the product being
returned was exposed to a hazardous substance as defined by OSHA, a copy of the
required Material Safety Data Sheet (MSDS) for each hazardous substance identified must
be included with the returned goods.
Warranty
Emerson Process Management will replace a faulty or failed 2120 with a new unit provided
that the fault or failure is reported either directly or via an accredited representative, within 1
year from the date of supply, and the product has been installed and used in accordance
with Emerson Process Management instruction manual 00809-0100-4030. Emerson
Process Management reserves the right to examine such product and to refuse replacement
at its discretion if the above conditions are not met.
2120/fig12.eps
Switchpoint (H20) (SP)
Switching hysteresis (HY)
±0.039-in. (±1 mm)
±0.039-in. (±1 mm)
0.5-in. (13 mm)
0.5-in. (13 mm)
0.5-in. (13 mm)
In the top diagram a lower
density media will give
switchpoint closer to the
connection. A higher density
media will give switchpoint
closer to fork tip.

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Reference Manual
00809-0100-4030, Rev DA
June 2007 Rosemount 2120
Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-2
Correct Fork Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-2
Cable Gland Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4
Set Mode Switch / Switching Time Delay . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4
LED Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-6
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-7
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 award 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.
SECTION 2INSTALLATION

Reference Manual
00809-0100-4030, Rev DA
June 2007
Rosemount 2120
2-2
Mechanical Installation
Correct Fork Alignment
Ensure correct fork alignment.
Figure 2-1. Sealing Figure 2-2. Tighten the Switch
PTFE
(Teflon)
Gasket
Seal (supplied in
02100-1020-0001)
NPT,
BSPT (R)
thread
BSPP (G)
thread
Tri-Clamp
2120/fig3, fig4.eps
2120/fig6.eps
Alignment groove

Reference Manual
00809-0100-4030, Rev DA
June 2007
Rosemount 2120
2-3
Pipe Installation
Vessel Installation
2120/fig7.eps2120/fig8.eps

Reference Manual
00809-0100-4030, Rev DA
June 2007
Rosemount 2120
2-4
Cable Gland Orientation
Set Mode Switch / Switching Time Delay
2120/fig10.eps
OPERATION MODE
Dry On Mode
Dry
Wet
Wet On Mode
Dry
Wet
Dry On Wet On
Seconds Delay
0.3 0.3
3
30
10
1
3
30
10
1
123
OUT
+-
4
PLC/PNP
2120/fig11.eps
Mode
Switch/Time
Delay
LED