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Quick Start Guide: Rosemount 2120 Level Switch
Manuals & Guides
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Rosemount Quick Start Guide: Rosemount 2120 Level Switch Manuals & Guides

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00825-0100-4030, Rev GB
Rosemount™ 2120 Level Switch
Vibrating Fork
Quick Start Guide
March 2022
Contents

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.

1.1 Safety messages

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.
Repair, e.g. substitution of components, etc. may jeopardize safety and is under no circumstances allowed.
WARNING
Explosions could result in death or serious injury.
Verify 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 the instruments are installed in accordance with intrinsically safe or non-incendive field wiring practices.
In explosion-proof/flameproof and non-incendive 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/explosion­proof requirements.
WARNING
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.
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.
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.
A
B
A
B
OK
OK
A B
C
OK OK
OK

2 Installation

2.1 Fork alignment in a pipe installation

The fork is correctly aligned by positioning the groove or notch as indicated (Figure 2-1).
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

The fork is correctly aligned by positioning the groove or notch as indicated (Figure 2-2).
Figure 2-2: Correct Fork Alignment for Vessel (Tank) Installation
A. Tri Clamp process connections have a circular notch B.
Threaded process connections have a groove Flanged process connections have a circular notch
C.
A
A

2.3 Mounting the threaded version

2.3.1 Threaded vessel (tank) or pipework connection

Procedure
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. Screw the level switch into the process connection.
Note
Tighten using the hexagon nut only.
Figure 2-3: Vertical Installation
A. Gasket for BSPP (G) threaded connection
Figure 2-4: Horizontal Installation
A. Gasket for BSPP (G) threaded connection
A

2.3.2 Threaded flange connection

Procedure
1. Place the customer-supplied flange and gasket on the vessel (tank) nozzle.
A. Gasket (customer supplied)
2. Tighten the bolts and nuts with sufficient torque for the flange and gasket.
3. 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.
A
A
4. Screw the level switch into the flange thread.
Note
Tighten using the hexagon nut only.
A. Gasket for BSPP (G) threaded connection

2.4 Mounting the flanged version

Procedure
1. Lower the level switch into the nozzle.
A. Gasket (customer supplied)
A
2. Tighten the bolts and nuts with sufficient torque for the flange and gasket.

2.5 Mounting the Tri Clamp version

Procedure
1. Lower the level switch into the flange face.
A. Seal (supplied with Tri Clamp)
2. Fit the Tri Clamp.

3 Prepare the electrical connections

3.1 Cable selection

Use 26–14 AWG (0.13 to 2.5 mm2) AWG 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 switching: 20 - 60 Vdc or 20 - 264 Vac (50/60 Hz)
• PNP/PLC electronics: 20 - 60 Vdc
• Relay DPCO (Double Pole Changeover) electronics (standard):
20 - 60 Vdc or 20 - 264 Vac (50/60 Hz)
• Relay DPCO electronics (12 Vdc nominal): 9 - 30 Vdc
• NAMUR electronics: 8 Vdc
• 8/16 mA electronics: 24 Vdc

3.4 Hazardous areas

When the device 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.
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