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
B
A
B
OK
OK
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
A
B
C
OK 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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