Emerson Rosemount 2120 Manuale utente

Quick Start Guide

00825-0100-4030, Rev GA

June 2020

Rosemount™ 2120 Level Switch

Vibrating Fork

Contents

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

Installation................................................................................................................................... 5

Prepare the electrical connections..............................................................................................10

Connect wiring and power-up.................................................................................................... 25

Configuration.............................................................................................................................31

Operation...................................................................................................................................33

Servicing and troubleshooting................................................................................................... 34

Quick Start Guide June 2020

2 Rosemount 2120 Level Switch

1 About this guide

This Quick Start Guide provides basic guidelines for the Rosemount 2120.

Refer to the Rosemount 2120 Reference Manual for more instructions. The

manual and this guide are also available electronically at Emerson.com/

Rosemount.

WARNING

Failure to follow safe installation and servicing guidelines could result in

death or serious injury.

•Ensure the level switch is installed by qualified personnel and in

accordance with applicable code of practice.

•Use the level switch only as specified in this manual. Failure to do so may

impair the protection provided by the level switch.

•The weight of a level switch with a heavy flange and extended fork length

may exceed 37 lb. (18 kg). A risk assessment is required before carrying,

lifting, and installing the level switch.

Explosions could result in death or serious injury.

•Verify that the operating atmosphere of the level switch is consistent

with the appropriate hazardous locations certifications.

•Before connecting a handheld communicator in an explosive

atmosphere, ensure that the instruments in the loop are installed in

accordance with intrinsically safe or non-incendive field wiring practices.

•In explosion-proof/flameproof and non-Incendive/type n installations, do

not remove the housing cover when power is applied to the level switch.

•The housing cover must be fully engaged to meet flameproof/explosion-

proof requirements.

Electrical shock could cause death or serious injury.

•Avoid contact with the leads and terminals. High voltage that may be

present on leads can cause electrical shock.

•Ensure the power to the level switch is off, and the lines to any other

external power source are disconnected or not powered while wiring the

level switch.

•Ensure the wiring is suitable for the electrical current and the insulation is

suitable for the voltage, temperature, and environment.

June 2020 Quick Start Guide

Quick Start Guide 3

WARNING

Process leaks could result in death or serious injury.

•Ensure the level switch is handled carefully. If the process seal is

damaged, gas might escape from the vessel (tank) or pipe.

Any substitution of non-recognized parts may jeopardize safety. Repair (e.g.

substitution of components) may also jeopardize safety and is not allowed

under any circumstances.

•Unauthorized changes to the product are strictly prohibited as they may

unintentionally and unpredictably alter performance and jeopardize

safety. Unauthorized changes that interfere with the integrity of the

welds or flanges, such as making additional perforations, compromise

product integrity and safety. Equipment ratings and certifications are no

longer valid on any products that have been damaged or modified

without the prior written permission of Emerson. Any continued use of

product that has been damaged or modified without the written

authorization is at the customer’s sole risk and expense.

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.

CAUTION

Hot surfaces

The flange and process seal may be hot at high process

temperatures.

Allow to cool before servicing.

Quick Start Guide June 2020

4 Rosemount 2120 Level Switch

2 Installation

2.1 Fork alignment in a pipe installation

Figure 2-1: Correct Fork Alignment for Pipe Installation

A. Tri Clamp process connections have a circular notch

B. Threaded process connections have a groove

2.2 Fork alignment in a vessel (tank) installation

Figure 2-2: Correct Fork Alignment for Vessel (Tank) Installation

OK OK

A. Tri Clamp process connections have a circular notch

B. Threaded process connections have a groove

C. Flanged process connections have a circular notch

June 2020 Quick Start Guide

Quick Start Guide 5

2.3 Mounting the threaded version

2.3.1 Seal and protect the threads

•Use anti-seize paste or PTFE tape according to site procedures.

A gasket may be used as a sealant for BSPP (G) threaded connections.

2.3.2 Threaded vessel (tank) or pipework connection

•Vertical installation.

Tighten using the hexagon only

Gasket for BSPP (G) threaded connection

•Horizontal installation.

Tighten using the hexagon only

Gasket for BSPP (G)

threaded connection

Quick Start Guide June 2020

6 Rosemount 2120 Level Switch

2.3.3 Threaded flange connection

Procedure

1. Place the customer-supplied flange and gasket on the vessel (tank)

nozzle.

Gasket (customer supplied)

2. Tighten the bolts and nuts with sufficient torque for the flange and

gasket.

3. Screw the level switch into the flange thread.

Tighten using the hexagon only

Gasket for BSPP (G) threaded connection

June 2020 Quick Start Guide

Quick Start Guide 7

2.4 Mounting the flanged version

Procedure

1. Lower the level switch into the nozzle.

Gasket (customer supplied)

2. Tighten the bolts and nuts with sufficient torque for the flange and

gasket.

Quick Start Guide June 2020

8 Rosemount 2120 Level Switch

2.5 Mounting the Tri Clamp version

Procedure

1. Lower the level switch into the flange face.

Seal (supplied with Tri Clamp)

2. Fit the Tri Clamp.

June 2020 Quick Start Guide

Quick Start Guide 9

3 Prepare the electrical connections

Note

See the Rosemount 2120 Product Data Sheet for all electrical specifications.

3.1 Cable selection

Use 26–14 AWG (0.13 to 2.5 mm2 wiring. Twisted-pairs and shielded wiring

is recommended for environments with high EMI (electromagnetic

interference). Two wires can be safely connected to each terminal screw.

3.2 Cable glands/conduits

For intrinsically safe, explosion-proof/flameproof, and dust-proof

installations, only use certified cable glands or conduit entry devices.

Ordinary location installations can use suitably rated cable glands or conduit

entry devices to maintain the Ingress Protection (IP) rating.

Unused conduit entries must always be sealed with a suitably rated

blanking/stopping plug.

Note

Do not run signal wiring in conduit or open trays with power wiring or near

heavy electrical equipment.

3.3 Power supply

The power supply requirements are dependent on the electronics selected.

•Direct Load electronics: 20 - 264 Vdc or 20 - 264 Vac (50/60 Hz).

•PNP electronics: 18 - 60 Vdc

•Standard Relay electronics: 20 - 264 Vdc or 20 - 264 Vac (50/60 Hz)

•Low voltage Relay electronics: 9 - 30 Vdc

•NAMUR electronics: 8 Vdc

•8/16 mA electronics: 24 Vdc

3.4 Hazardous areas

When the level switch is installed in hazardous areas (classified locations),

local regulations and the conditions-of-use specified in applicable

certificates must be observed. Review the Rosemount 2120 Product

Certifications document for information.

Quick Start Guide June 2020

10 Rosemount 2120 Level Switch

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