Emerson Rosemount 2120 User manual

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.
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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.
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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
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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
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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
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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.
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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.
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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.
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10 Rosemount 2120 Level Switch

3.5 Wiring diagrams
CAUTION
•Before use, check the cable glands and blanking plugs are suitably rated.
•Isolate supply before connecting the switch or removing the electronics.
•The Protective Earth (PE) terminal must be connected to an external
earthing system.
3.5.1 Direct load switching electronics cassette
Figure 3-1: Direct Load Switching (Two-wire, Red Label)
1 2 3
12
PE
(Ground)
IL
Example of external wiring
R
0 V + V
Neutral Live
Fuse
2A(T)
3
DPST
Isolate supply before making connections.
R = External load (must be fitted)
U = 20 - 264 V ~ (ac) (50/60 Hz)
IOFF < 4 mA
IL= 20 - 500 mA
= 5 A, 40 ms (inrush)
IPK
U = 20 - 60 V (dc)
IOFF < 4 mA
IL= 20 - 500 mA
= 5 A, 40 ms (inrush)
IPK
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Table 3-1: Direct Load Functions
Mode: dry on, high level alarm Mode: wet on, low level alarm
1 2
PE
(Ground)
IL
R
0 V + V
NL
Fuse
2A(T)
3
DPST
DU
12 V
1 2
PE
(Ground)
IL
R
0 V + V
N L
Fuse
2A(T)
3
DPST
< 4 mA
1 2
PE
(Ground)
IL
R
0 V + V
NL
Fuse
2A(T)
3
DPST
DU
12 V
1 2
PE
(Ground)
IL
R
0 V + V
N L
Fuse
2A(T)
3
DPST
< 4 mA
= Load off= Load on
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3.5.2 PNP/PLC electronics cassette
Figure 3-2: PNP Output for Load and Direct PLC Switching (Yellow Label)
1
1 2
234
PE
(Ground)
Example of external wiring
0 VO/P
+ V
Fuse
2A(T)
3 4
Isolate supply before making connections.
IL (MAX) = 0 - 500 mA
IL (OFF) < 100 mA
IPK = 5 A, 40 ms (inrush)
UOUT(ON) = U - 2.5 Vac (20 °C)
UOUT(ON) = U - 2.75 Vac (-40 to 80 °C)
U=20 - 60 V (dc)
I < 4 mA + IL
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Table 3-2: PNP/PLC Cassette Functions
Mode: dry on, high level alarm Mode: wet on, low level alarm
PLC (positive input)
12
PE
(Ground)
-
I/P
PLC
+
3 4
I
L
DU
< 3 V
12
PE
(Ground)
-I/P
PLC
+
3 4
I
L
<100 mA
12
PE
(Ground)
-
I/P
PLC
+
3 4
I
L
DU
< 3 V
12
PE
(Ground)
-I/P
PLC
+
3 4
I
L
<100 mA
PNP dc
1 2
PE
(Ground)
-+
3 4
I
L
DU
< 3 V
Fuse
1A(T)
R
1 2
PE
(Ground)
-
+
3 4
I
L
Fuse
1A(T)
R
<100 mA
1 2
PE
(Ground)
-+
3 4
I
L
DU
< 3 V
Fuse
1A(T)
R
1 2
PE
(Ground)
-
+
3 4
I
L
Fuse
1A(T)
R
<100 mA
= Load off= Load on
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3.5.3 Relay output electronics cassette (standard version)
Figure 3-3: Relay Output, DPCO (Green Label, Standard Cassette)
1 2 3
Example of external wiring
12
PE
(Ground)
0 V + V
NL
Fuse
0.5 (T)
3
DPST
Isolate supply before making connections.
U=20 - 264 V ~ (ac) (50/60 Hz)
I < 6 mA
U= 20 - 60 V (dc)
I < 6 mA
45678
9
cos f= 1;
L/R = 0 ms
IMAX = 5 A
Resistive load
cos f= 0.4;
L/R = 7 ms
IMAX = 3.5 A
UMAX = 250 V UMAX = 250 V
PMAX = 1250 VA PMAX = 875 VA
Inductive load
ac: ac:
UMAX = 30 V UMAX = 30 V
PMAX = 240 W PMAX = 170 W
dc: dc:
4 5 6
NC C NO
7 8 9
NC C NO
Note
A Double Pole, Single Throw on/off switch must be fitted for safe
disconnection of the power supply. Fit the DPST switch as near as possible to
the Rosemount 2120. Keep the DPST switch free of obstructions. Label the
DPST switch to indicate it is the supply disconnection device for the
Rosemount 2120.
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Table 3-3: Relay Cassette Functions
Mode: dry on, high level alarm Mode: wet on, low level alarm
NC C NO NC C NO
NC C NO NC C NO
NC C NO NC C NO
NC C NO NC C NO
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3.5.4 Relay output electronics cassette (12 Vdc nominal version)
Figure 3-4: Relay Output, DPCO (Green Label, 12 Vdc Cassette)
1 2 3
5678
9
Example of external wiring
12
PE
(Ground)
0 V + V
Fuse
0.5 (T)
3
DPST
Isolate supply before making connections.
U = 9 - 30 V (dc)
I < 4 mA
4
cos f= 1;
L/R = 0 ms
IMAX = 2 A
Resistive load
cos f= 0.4;
L/R = 7 ms
IMAX = 1 A
Inductive load
UMAX = 30 V UMAX = 30 V
PMAX = 60 W PMAX = 30 W
4 5 6
NC C NO
7 8 9
NC C NO
Note
A Double Pole, Single Throw on/off switch must be fitted for safe
disconnection of the power supply. Fit the DPST switch as near as possible to
the Rosemount 2120. Keep the DPST switch free of obstructions. Label the
DPST switch to indicate it is the supply disconnection device for the
Rosemount 2120.
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Table 3-4: Relay cassette functions
Mode: dry on, high level alarm Mode: wet on, low level alarm
NC C NO NC C NO
NC C NO NC C NO
NC C NO NC C NO
NC C NO NC C NO
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3.5.5 NAMUR electronics cassette
Figure 3-5: NAMUR Output (Light Blue Label)
1
1
2
2
Isolate supply before making connections.
ION = 2.2 - 2.5 mA
IOFF = 0.8 - 1.0 mA
IFAULT < 1.0 mA
+
-
A
A. A certified intrinsically safe isolating amplifier to IEC 60947-5-6
Note
•This cassette is suitable for Intrinsically Safe (IS) applications and requires
a certified isolating barrier. See the Rosemount 2120 Product
Certifications document for Intrinsically Safe approvals.
•This electronics cassette is also suitable for non-hazardous (safe) area
applications. It can only be interchanged with the 8/16 mA cassette.
•Do not exceed 8 Vdc.
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Table 3-5: NAMUR Cassette Functions
Mode: dry on, high level alarm Mode: wet on, low level alarm
1 2
(+)(-)
> 2.2 mA
1 2
(+)(-)
< 1.0 mA
1 2
(+)(-)
> 2.2 mA
1 2
(+)(-)
< 1.0 mA
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20 Rosemount 2120 Level Switch