Product Data Sheet

April 2014
00813-0100-4030, Rev GD

Rosemount 2120
Full-featured Vibrating Fork Liquid Level Switch

Designed for operation in process

temperatures of 40 to 302 F (40 to 150 C)

Adjustable switching delay for turbulent or

splashing applications

Electronic self-checking and condition

monitoring

Fast Drip fork design gives a quicker response

time, especially with viscous liquids

Increased safety, SIL2 certified to IEC 61508 as

required by IEC 61511

General area, explosion-proof/flameproof, and

intrinsically safe options

Rosemount 2120

April 2014

Overview of the Rosemount 2120

Measurement principle
The Rosemount 2120 is designed using the principle of a tuning fork.
A piezo-electric crystal oscillates the forks at their natural frequency.
Changes to this frequency are continuously monitored. The frequency
of the vibrating fork sensor changes depending on the medium in
which it is immersed. The denser the liquid, the lower the frequency.
When used as a low level alarm, the liquid in the tank or pipe drains
down past the fork, causing a change of natural frequency that is
detected by the electronics and switches the output state.
Adjustable Mode and Switching Delay

When the 2120 is used as a high level alarm, the liquid rises in the tank
or pipe, making contact with the fork which then causes the output
state to switch.

Key features and benefits

Function virtually unaffected by flow, bubbles, turbulence, foam,

vibration, solids content, coating products, liquid properties, and
product variations

The 2120 is designed for operation in process temperatures from

40 to 302 F (40 to 150 C)

A heartbeat LED indicates its operating state. The LED also flashes
when the switch output is off and is constantly lit when 'on'

Adjustable switching delay prevents false switching in turbulent or

splashing applications

Fast Drip fork design gives quicker response time, especially with
viscous liquids. Rapid wet-to-dry and dry-to-wet time setting for
highly responsive switching

Fork shape is optimized for hand polishing to meet hygienic

requirements

Magnetic test point makes functional test easy

No moving parts or crevices for virtually no maintenance

Fast Drip Forks

Contents
Overview of the Rosemount 2120 . . . . . . . . . . . . . . page 2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . page 8

Rosemount 2120 level switch ordering . . . . . . . . . page 4

Product certifications . . . . . . . . . . . . . . . . . page 11

Rosemount 2120 spare parts and accessories . . . page 7

Dimensional drawings . . . . . . . . . . . . . . . . page 13

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April 2014

Rosemount 2120

Fit and forget

Once installed, the 2120 is ready to go.

It needs no calibration and requires minimum installation

The heartbeat LED gives an instant visual indication that the unit is
operational

Functional testing of the instrument and system is easy with a magnetic

test point

High And Low Level Alarm

You can install, and forget it

Superior performance

The 2120 is a popular choice for high and low level alarm and pump control
duties for its simplicity, ease of use, and reliability

Functionality is virtually unaffected by flow, turbulence, bubbles, foam, or

vibration

The Fast Drip design allows the liquid to be quickly drawn away from the
fork tip when mounted horizontally, making the 2120 quicker and more
responsive in high density or viscous liquid applications

High-temperature Applications

With a user-selectable time delay feature, the risk of false switching is

minimized in turbulent or splashing applications

Applications

Overfill protection

High and low point level alarms

Pump control or limit detection

Run dry or pump protection

Hygienic applications

High-temperature applications

Wireless applications

Point Level Alarm

Level
Rx

Tx

USB

Rosemount TankRadar

RS-232

5900S

In tank gauging systems, a Rosemount

2120 high level alarm switch can be used
as an alternative to a radar level gauge
(see the Rosemount Tank Gauging product
data sheet 00813-0100-5100 for details)

Ext. pwr

2120

Pump Control / Limit Detection

Lo - GAIN - Hi

On - TERM - Off

FBM 2180

Wireless Applications using a

Rosemount 702 Discrete Transmitter

High level alarm: two separate

and configurable relay outputs

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Rosemount 2120

April 2014

Rosemount 2120 level switch ordering

Table 1. Rosemount 2120 ordering information
The Standard offering represents the most common models and options. These options should be selected for best delivery.
The Expanded offering is manufactured after receipt of order and is subject to additional delivery lead time.
Model

Product Description

2120
Vibrating Fork Liquid Level Switch / 40302 F (40...150 C)
Materials of Construction: Process Connection/Fork
Standard
D
316/316L Stainless Steel (1.4401/1.4404) dual certified
Expanded

Standard

F(1)
ECTFE/PFA copolymer, coated 316/316L SST (1.4401/1.4404)
C(2)
Alloy C (UNS N10002), Alloy C-276 (UNS N10276), Solid
Process Connection Size / Type
Standard
0A
0B
0D
1A
1B
1D
1P
5R
2R
1G
1H
1J
5G
5H
2G
2H
3G
3H
4G
4H
1K
1L
1M
1N
5K
5L
2K
2L
7K
7L
3K
3L
4K
4L
Expanded

5J
2J
3J
4J

11/2-in. ASME B16.5 Class 600 Raised Face (RF) Flange

2-in. ASME B16.5 Class 600 Raised Face (RF) Flange
3-in. ASME B16.5 Class 600 Raised Face (RF) Flange
4-in. ASME B16.5 Class 600 Raised Face (RF) Flange

/4-in. BSPT (R) Thread

3
/4-in. BSPP (G) Thread
3
/4-in. NPT Thread
1-in. BSPT (R) Thread
1-in. BSPP (G) Thread
1-in. NPT Thread (2-in. NPT Thread available by adding R2105 to the model number(3))
1-in. BSPP (G), O-ring, Hygienic Fitting
11/2-in. (38 mm) Tri-Clamp, Hygienic Fitting
2-in. (51 mm) Tri-Clamp, Hygienic Fitting
1-in. ASME B16.5 Class 150 Raised Face (RF) Flange
1-in. ASME B16.5 Class 300 Raised Face (RF) Flange
1-in. ASME B16.5 Class 600 Raised Face (RF) Flange
11/2-in. ASME B16.5 Class 150 Raised Face (RF) Flange
11/2-in. ASME B16.5 Class 300 Raised Face (RF) Flange
2-in. ASME B16.5 Class 150 Raised Face (RF) Flange
2-in. ASME B16.5 Class 300 Raised Face (RF) Flange
3-in. ASME B16.5 Class 150 Raised Face (RF) Flange
3-in. ASME B16.5 Class 300 Raised Face (RF) Flange
4-in. ASME B16.5 Class 150 Raised Face (RF) Flange
4-in. ASME B16.5 Class 300 Raised Face (RF) Flange
DN25, EN1092 PN 10/16 Flange
DN25, EN1092 PN 25/40 Flange
DN25, EN1092 PN 63 Flange
DN25, EN1092 PN 100 Flange
DN40, EN1092 PN 10/16 Flange
DN40, EN1092 PN 25/40 Flange
DN50, EN1092 PN 10/16 Flange
DN50, EN1092 PN 25/40 Flange
DN65, EN1092 PN 10/16 Flange
DN65, EN1092 PN 25/40 Flange
DN80, EN1092 PN 10/16 Flange
DN80, EN1092 PN 25/40 Flange
DN100, EN1092 PN 10/16 Flange
DN100, EN1092 PN 25/40 Flange

Standard

www.rosemount.com

April 2014

Rosemount 2120

Table 1. Rosemount 2120 ordering information

The Standard offering represents the most common models and options. These options should be selected for best delivery.
The Expanded offering is manufactured after receipt of order and is subject to additional delivery lead time.
5M
DN40, EN1092 PN 63 Flange
5N
DN40, EN1092 PN 100 Flange
2M
DN50, EN1092 PN 63 Flange
2N
DN50, EN1092 PN 100 Flange
7M
DN65, EN1092 PN 63 Flange
7N
DN65, EN1092 PN 100 Flange
3M
DN80, EN1092 PN 63 Flange
3N
DN80, EN1092 PN 100 Flange
4M
DN100, EN1092 PN 63 Flange
4N
DN100, EN1092 PN 100 Flange
SA
25A, 10K, JIS B2220 Flange
SB
25A, 20K, JIS B2220 Flange
TA
40A, 10K, JIS B2220 Flange
TB
40A, 20K, JIS B2220 Flange
UA
50A, 10K, JIS B2220 Flange
UB
50A, 20K, JIS B2220 Flange
VA
80A, 10K, JIS B2220 Flange
VB
80A, 20K, JIS B2220 Flange
ZA
100A, 10K, JIS B2220 Flange
ZB
100A, 20K, JIS B2220 Flange
XX(4)
Customer Specific
Electronic Type

Available Certifications

Standard
T
Direct load switching (Mains 2-wire) 20 to 264 Vac 50/60Hz, 20 to 60 Vdc
G
PNP/PLC low voltage (3-wire) 20 to 60 Vdc
V
Relay DPCO (9...30 Vdc version available by adding R2257 to model number(3)(5))
K
NAMUR
H
8/16 mA
Surface Finish

NA, E*, G5, G6

NA, E*, G5, G6
NA, E*, G5, G6
All
All
Available Connections

Standard
1
Standard surface finish
2
Hand polished (Ra < 0.4 m)
Product Certifications

All
Hygienic Connection Only
Electronic Types Allowed

Available Housings

All except 9...30 Vdc Relay

All
All except 9...30 Vdc Relay
All except 9...30 Vdc Relay
All
All except 9...30 Vdc Relay
All except 9...30 Vdc Relay
K, H
K, H
K, H
K, H

All
Y, T
Y, T
X, S
Y, T
Y, T
X, S
All
All
All
All

Standard
NA
G5(6)
G6(7)
E1
E5(6)
E6(7)
E7
I1
I5
I6
I7
Housing

No Hazardous Locations Certifications

FM Ordinary Locations (unclassified, safe area)
CSA Ordinary Locations (unclassified, safe area)
ATEX Flameproof
FM Explosion-proof
CSA Explosion-proof
IECEx Explosion-proof
ATEX Intrinsic Safety
FM Intrinsic Safety
CSA Intrinsically Safe
IECEx Intrinsic Safety

Standard

Standard

Available for Certifications

Standard
A
D
X
Y

Standard

Glass Filled Nylon, M20 conduits/cable threads

Glass Filled Nylon, 1/2-in. NPT conduits/cable threads
Aluminum Alloy, M20 conduits/cable threads
Aluminum Alloy, 3/4-in. NPT conduits/cable threads

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NA, I1, I5, I6, and I7

NA, I1, I5, I6, and I7
All except G5, G6, E5, E6
All except E1 and E7

Standard

Rosemount 2120

April 2014

Table 1. Rosemount 2120 ordering information

The Standard offering represents the most common models and options. These options should be selected for best delivery.
The Expanded offering is manufactured after receipt of order and is subject to additional delivery lead time.
All except G5, G6, E5, E6
All except E1 and E7

S
Stainless Steel, M20 conduits/cable threads
T
Stainless Steel 3/4-in. NPT conduits/cable threads
Fork Length

Available Connection

Standard
A
Standard length 1.7 in. (44 mm)
H(8)
Standard length flange 4.0 in. (102 mm)
E(9)
Extended, customer specified length in tenths of inches
M(9)
Extended, customer specified length in millimeters
Specific Extended Fork Length

All except flanged and 2-in. NPT

All flanged models
All except 1-in. BSPP O-ring (1P)
All except 1-in. BSPP O-ring (1P)

Standard

Standard

Standard

0000
Factory default length (only if Fork Length A or H is selected)
XXXX(9)
Specific customer specified length in tenths of inches, or millimeters (XXXX mm or XXX.X inches)
OPTIONS
Calibration Data Certification
Standard

Standard

Q4
Certificate of functional test
Material Traceability Certification
Standard

Standard

Q8(8)(10)
Material traceability certification per EN 10204 3.1
Material Certification
Standard

Standard

Q15(8)(10) NACE MR0175 / ISO 15156

Q25(8)(10) NACE MR0103
Special Procedures
Standard

Standard

P1(11)

Hydrostatic testing with certificate

Typical Model Number: 2120 D 0A K 1 I1 A 0000 Q8
(1) ECTFE/PFA copolymer coating is only available for a flanged 2120 but excludes 1-in./DN25/25A flanges.
Flanges are dual certified 316 and 316L Stainless Steel (1.4401 and 1.4404).
(2) Available for threaded process connection codes 0A, 0D, 1A, and 1D and flanged process connections as standard, other upon request.
(3) For a combination of 2-in. threaded process connection and 9 to 30 Vdc (12 Vdc nominal) version of the Relay electronics, add R2258 to the model code.
(4) Other process connections available upon request.
(5) The 9 to 30 Vdc (12 Vdc nominal) version of the Relay electronics is available with Product Certification codes G5 or E5.
(6) See Product certifications on page 11. E5 includes G5 requirements. G5 is for use in unclassified, safe area locations only.
(7) See Product certifications on page 11. E6 includes G6 requirements. G6 is for use in unclassified, safe area locations only.
(8) Not available for hand polished wet side.

(9) Minimum length available for 3/4-in. threaded connection is 3.8 in. (95 mm); for 1-in. and 2-in. threaded, it is 3.7 in. (94 mm); for flanged, it is 3.5 in. (89 mm);
and for Tri-Clamp, it is 4.1 in. (105 mm). Maximum length is 157.5 in. (4000 mm), except for ECTFE/PFA copolymer coating and hand-polished process where the maximum
length is 59.1 in. (1500 mm) and 39.4 in. (1000 mm) respectively. Examples: Code E1181 is 118.1 inches. Code M3000 is 3000 millimeters.
(10) Only available for wetted parts.
(11) Option limited to units with extended lengths up to 59.1-in. (1500 mm). Option is not available for ECTFE/PFA coating.

Safety Integrity Level (SIL) certification

The Rosemount 2120 has been independently certified to IEC 61508 as required by IEC 61511. Certification was conducted by Exida.

Overfill approval option

The Rosemount 2120 has been TV-tested and approved for overfill protection according to the German DIBt/WHG regulations.
This option is not selectable in the ordering information table. If required, add R2259 to the end of the model code.
For example, 2120 D 0A K E1 X A0000 R2259.

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April 2014

Rosemount 2120

Rosemount 2120 spare parts and accessories

Table 2. Rosemount 2120 spare parts and accessories
The Standard offering represents the most common models and options. These options should be selected for best delivery.
The Expanded offering is manufactured after receipt of order and is subject to additional delivery lead time.
Spares and Accessories (1) (2)
Standard

Standard

02100-1000-0001

Seal for 1-in. BSPP (G1A). Material: Non-asbestos BS7531 grade X carbon fiber with rubber binder

02100-1040-0001

Seal for 3/4-in. BSPP (G3/4A). Material: Non-asbestos BS7531 grade X carbon fiber with rubber binder

02100-1010-0001

Hygienic adaptor boss 1-in. BSPP. Material: 316 SST fitting. FPM/FKM O-ring

02100-1020-0001

2-in. (51 mm) Tri-clamp kit (vessel fitting, clamp ring, and seal). Material: 316 SST, NBR Nitrile

02100-1030-0001

Telescopic test magnet

02120-2000-0001(3)

11/2-in. BSPP adjustable 316 SST clamp gland for 1-in. extended lengths. Silicone (Si) rubber seal

02120-2000-0002(3)

11/2-in. NPT adjustable 316 SST clamp gland for 1-in. extended lengths. Silicone (Si) rubber seal

02120-7000-0001

Replacement Cassette: Direct load switching (2 Wire) (Red)

02120-7000-0002

Replacement Cassette: PNP/PLC, low voltage (Yellow)

02120-7000-0003

Replacement Cassette: NAMUR (Light Blue)

02120-7000-0004

Replacement Cassette: Relay (DPCO), standard version (Green)

02120-7000-0005

Replacement Cassette: 8/16 mA output (Dark Blue)

02120-7000-0007

Replacement Cassette: Relay (DPCO), 9...30 Vdc (12 Vdc nominal) version (Green)

(1) Check the Electronic Type and Product Certification sections in Table 1 on page 4 for availability conditions.
(2) Intrinsically Safe (IS) approved cassettes can only be replaced with the same type of IS cassette. Non-IS cassette types can be interchanged with other non-IS cassettes, but
the new label must be fitted and the original part number transferred to the new label.
(3) The adjustable clamp gland is not explosion-proof.

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Rosemount 2120

April 2014

Specifications

Gasket material for 3/4-in. and 1-in. BSPP (G) is non-asbestos BS7531

Grade X carbon fiber with rubber binder

General

Dimensional drawings
See Dimensional drawings on page 13

Product
Rosemount 2120 Full-featured Vibrating Fork Liquid Level Switch

Measuring principle

Performance
Hysteresis (water)

Vibrating Fork

0.039-in. (1 mm) nominal

Applications
Most liquids including coating liquids, aerated liquids, and slurries

Switching point (water)

0.5 in. (13 mm) from tip (vertical) / from edge (horizontal) of fork

(this will vary with different liquid densities)

Mechanical

Functional

Housing / Enclosure

Maximum operating pressure

Table 3. Housing / Enclosure specification

The final rating depends on the selected process connection

Housing
Material

Nylon PA66
30%GF

LED Window
Conduit Entry
Ingress
Protection

Al alloy ASTM
B85 A360.0

316C12 SST

Yes

No

No

Not
Applicable
Nylon PA12

Polyurethane
Paint
None

Not
Applicable
None

Rotational
Housing Paint

/2-in.
NPT
IP66/67 to
EN60529

M20

M20

/4-in.
NPT
IP66/67 to
EN60529,
NEMA 4X

M20

/4-in.
NPT
IP66/67 to
EN60529,
NEMA 4X

Connections
Threaded, hygienic, and flanged process connections.

See Process Connection Size / Type on page 4 for a complete list

Extended lengths
The maximum extended length is 157.5 in. (4000 mm) except for

ECTFE/PFA copolymer coating and hand-polished process connection

options which have a maximum length of 59.1 in. (1500 mm) and
39.4 in. (1000 mm) respectively
Table 4. Minimum extended lengths

Threaded connection: see Figure 1 for operating pressures

Note: Clamp glands 02120-2000-0001 and 02120-2000-0002

(page 7) limit the maximum pressure to 18.85 psig (1,3 bar g)
Hygienic connection: 435 psig (30 bar g)
Flanged connection:

See Figure 1 or Table 5 (whichever gives the lowest pressure)

Figure 1. Process pressure
Process Pressure psig (barg)

Housing Code

1450 (100)
1160 (80)

32 (0)
-14.5 (-1.0)
-40 32
(-40) (0)

122
(50)

302 Process
(150) Temperature F (C)

Table 5. Maximum flange pressure rating

Standard

Class/Rating

SST Flanges

ASME B16.5

Class 150

275 psig(1)

ASME B16.5

Class 300

720 psig(1)

Process Connection

Minimum Extended Length

ASME B16.5

Class 600

1440 psig(1)

3/4in. Threaded

3.8 in. (95 mm)

EN1092-1

PN 10

10 barg(2)

1in. and 2-in. Threaded

3.7 in. (94 mm)

EN1092-1

PN 16

16 barg(2)

Flanged

3.5 in. (89 mm)

EN1092-1

PN 25

25 barg(2)

Tri-Clamp

4.1 in. (105 mm)

EN1092-1

PN 40

40 barg(2)

EN1092-1

PN 63

63 barg(2)

Process connection materials

EN1092-1

PN 100

100 barg(2)

316/316L Stainless Steel (1.4401/1.4404 dual certified)

JIS B2220

10K

14 barg(3)

Alloy C (UNS N10002) and Alloy C-276 (UNS N10276)

JIS B2220

20K

34 barg(3)

available for flanged, and BSPT and NPT threaded process connections
(3/4-in. and 1-in. BSPT (R), and 3/4-in. and 1-in. NPT)
ECTFE/PFA co-polymer coated 316/316L Stainless Steel

(1.4401/1.4404 dual certified)

only available for a flanged 2120 but excludes 1-in./DN25/25A flanges
Hand-polished to better than 0.4 m option for hygienic connections

(1) At 100 F (38 C), the rating decreases with an increasing process
temperature.
(2) At 122 F (50 C), the rating decreases with an increasing process
temperature.
(3) At 248 F (120 C), the rating decreases with an increasing process
temperature.

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April 2014

Rosemount 2120

Minimum and maximum operating temperatures

See Figure 2 for operating temperatures
Clamp glands 02120-2000-0001 and 02120-2000-0002 (page 7)

limit the maximum temperature to 257 F (125 C)

The ambient temperature for a 8/16 mA cassette is limited to

158 F (70 C) in dust applications

Electrical
Switching mode
User selectable switching mode (Dry=on or Wet=on)

Protection
Polarity insensitive

Relay (except 12 Vdc nominal version) and Direct Load electronics

Figure 2. Operating temperatures

Ambient Temperature F (C)

Over-current protection Direct Load and PNP/PLC electronics

Short-circuit protection Direct Load and PNP/PLC electronics
Load-missing protection Direct Load and PNP/PLC electronics

176 (80)

Surge protection (to IEC61326) Available on all versions of the 2120

122 (50)

Heartbeat LED
The 2120 has a status-indicating heartbeat LED, which can be seen at

32 (0)
-40 (-40)

all times and from all angles through a lens in the cover (no lens in
metal housings)

-40 32
(-40) (0)

140
(60)

302
(150)

Process Temperature F (C)

Liquid density requirement

Minimum 37.5 lb/ft3 (600 kg/m3)

Liquid viscosity range

0.2 to 10000 cP (centiPose)

Solids content and coating

Maximum recommended diameter of solid particles in the liquid is

0.2 in. (5 mm)

For a coating product, avoid bridging of forks

Switching delay
User selectable 0.3, 1, 3, 10, 30 seconds delay for dry-to-wet and

wet-to-dry switching

CIP (Clean In Place) and SIP (Steam In Place) cleaning

Withstands cleaning routines up to 275 F (135 C)

The LED flashes when the output is off and is constantly lit when it is

on. The LED gives a constant indication that the 2120 is functioning
correctly (different flash rates are used to indicate a product
malfunction) and gives a local indication of the process state

Magnetic test point

A magnetic test point is located on the side of the housing, allowing a

functional test of the 2120 and a system connected to it. By holding a

magnet to the target, the 2120 output changes state for as long as
the magnet is held there

Terminal connection (wire diameter)

Minimum 26 AWG, Maximum 14 AWG (0.13 to 2.5 mm2).

Note national regulations.

Conduit plugs/cable gland

Metal housing:

Conduit entries for explosion-proof areas are shipped with one Exd
plug (loose in bag) and two dust caps fitted. Use suitably rated cable
glands. Unused conduit entries must be sealed with a suitably rated
blanking plug
Glass-filled nylon housing with direct load, PNP/PLC and IS electronics

NACE
NACE compliance to MR0175 / ISO 15156 or MR0103, depending on

the option code selected for the model number

are shipped with one PA66(1) cable gland and one blanking plug
Glass-filled nylon housing with relay electronics are shipped with

two PA66(1) cable glands

Safety integrity level (option codes QS and QT)

Grounding

The Rosemount 2120 FMEDA is certified for SIL2

The 2120 must always be grounded either through the terminals or

For more information, go to:

using the external ground connection provided.

http://www.emersonprocess.com/rosemount/safety/

(1)

www.rosemount.com

Cable diameter 0.2 to 0.3 in. (5 to 8 mm)

Rosemount 2120

April 2014

Electrical connections

Direct Load
Switching

OPERATION MODE
Dry On Mode
Dry
Wet

Dry
Wet

PE
(Ground)

Fuse 2A(T)

10

10
30

30

IL

Seconds Delay

8V
dc
Dry
Wet

Wet On Mode

Dry On

PE
(Ground)

U = 20...264 V ~ (ac)
(50/60 Hz)
I < 6 mA
U = 20...60 V
I < 6 mA

+V

12 VDC NOM.

0.3
1

0.3
1

3
10
30

3
10
30

0.3
1

PE
(Ground)

NO

IMAX = 5 A

Inductive Load
cos = 0.4 ;
L/R = 7 ms
IMAX = 3.5 A

ac:
UMAX = 250 V

ac:
UMAX = 250 V

PMAX = 1250 VA
dc:
UMAX = 30 V

PMAX = 875 VA
dc:
UMAX = 30 V

PMAX = 240 W

PMAX = 170 W

NO

NC

NO

3
10 Dry
30 Wet

Fuse 0.5 (T)

(dc)

+V

Dry On

NC

NO

NC

NO

Resistive Load
cos = 1 ;
L/R = 0 ms
IMAX = 2 A

Inductive Load
cos = 0.4 ;
L/R = 7 ms
IMAX = 1 A

ac:
UMAX = 125 V

ac:
UMAX = 125 V

PMAX = 62.5 VA
dc:
UMAX = 30 V

PMAX = 37.5 VA
dc:
UMAX = 30 V

PMAX = 60 W

PMAX = 30 W

0.3
1

0.3
1

10

10
30

30

8/16 mA
+

OUT

Dry On Mode
Dry
Wet

Dry
Wet

Seconds Delay

1
= 15 ... 17 mA

PLC/PNP

OPERATION MODE
Wet On

U = 24 Vdc Nominal

I OFF = 7.5 ... 8.5 mA

I FAULT < 3.7 mA

PE
(Ground)
+V

Fuse 2A(T)

Dry On Mode
Dry
Wet

Wet On Mode

7
NC

Solid state PNP output for direct interface to a PLC

Wet
Dry

Ex

6
NO

Isolate Supply Before Removing

DPST

I ON

5
C

NC

OPERATION MODE

PE
(Ground)

Wet On

Seconds Delay

8/16 mA (dark blue) cassette

NO

0.3 Wet
1

3
10
30

0V

NC

OPERATION MODE
Seconds Delay
Dry On
Dry On Wet On Dry

U = 9...30 V
I < 4 mA

Ex

(dc)

A certified intrinsically safe

isolating amplifier to IEC 60947-5-6

NC

Resistive Load
cos = 1 ;
L/R = 0 ms

DPST
Live

Ex

NO

10 Dry
30 Wet

Fuse 0.5 (T)

EN 50227 / NAMUR

Wet On

ION = 2.2 ... 2.5 mA

IOFF = 0.8 ... 1.0 mA
IFAULT < 1.0 mA

Ex

0V

OPERATION MODE

NC

0.3 Wet
1

DPCO dual relay cassette (12 Vdc nominal version)

Dry On Mode
Dry
Wet

NAMUR (light blue) cassette

0.3
1
3
10

Wet On

U = 20 - 60 V
(dc)
IOFF < 4 mA
IL = 20 - 500 mA
IPK = 5 A, 40 ms (inrush)

+V

30

Isolate Supply
Before Removing

Isolate Supply Before Removing

Seconds Delay
Dry On
Dry On Wet On Dry

WARNING

R = External load (must be fitted )

Neutral Live

0V

0.3
1

U = 20 - 264 V ~ (ac) (50/60Hz )

IOFF < 4 mA
IL = 20 - 500 mA
IPK = 5 A, 40 ms (inrush)

DPST

OPERATION MODE

Warning

N
0.3
1

Wet On Mode

Wet On

RELAY

LOAD LINE

Dry On

DPCO dual relay cassette (standard version)

RELAY

Direct load switching (mains two wire) cassette

O/P 0V

Dry On

0.3
1

0.3
1

10

10
30

30

Wet On Mode

U = 20 - 60 V
I < 4 mA + I L

Wet On

Isolate Supply
Before Removing

Seconds Delay

(dc)

IL (MAX) = 0 - 500 mA
IPK = 5 A, 40 ms (inrush)
UOUT(ON) = U - 2.5 V
IL (OFF) < 100 A

+
A certified intrinsically safe barrier
must be used to meet IS requirements

Drives 4-20 mA Analog Input

10

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April 2014

Rosemount 2120

Product certifications
European directive information

Ordinary location certification for FM

The EC declaration of conformity for all applicable European

directives for this product can be found on the Rosemount
website at www.rosemount.com.

G5

The switch has been examined and tested to determine

that the design meets basic electrical, mechanical, and fire
protection requirements by FM, a nationally recognized
testing laboratory (NRTL) as accredited by the Federal
Occupational Safety and Health Administration (OSHA)

ATEX Directive (94/9/EC)

Complies with the ATEX Directive.
Pressure Equipment Directive (PED) (97/23/EC)

Project ID: 3021776

The Rosemount 2120 is outside the scope of PED Directive.

Ordinary location certification for CSA

Low Voltage Directive

G6

EN61010-1 Pollution degree 2, Category II (264 V maximum),

Pollution degree 2, Category III (150 V maximum)

The switch has been examined and tested to determine

that the design meets basic electrical, mechanical, and fire
protection requirements by CSA, a nationally recognized
testing laboratory as accredited by the Standards Council
of Canada (SCC). Single seal

Electro Magnetic Compatibility (EMC) Directive

EN61326 Emissions to Class B.
Immunity to industrial location requirements.
NAMUR NE21.
CE-mark

Certificate Number: 06 CSA 1805769

Canadian Registration Number

CRN 0F04227.2C

Complies with applicable directives (EMC, ATEX, and LVD).

NAMUR approval
NAMUR NE95 type test is available upon request.
Complies with NAMUR NE21.

Overfill approval
Certificate: Z-65.11-522.
TV-tested and approved for overfill protection according to the
German DIBt/WHG regulations. Certified under safety devices
for tanks and piping related to water pollution control.

Marine approvals
ABS

American Bureau of Shipping

GL

Germanischer Lloyd

Drinking water approval

Mobrey Ltd. (Slough, United Kingdom) confirms that the wetted
parts of the Rosemount 2120 vibrating fork level switch are
suitable and approved for drinking water usage. The wetted
parts of the vibrating fork level switches executed in stainless
steel (option code D) and Alloy C/Alloy C-276 (option code C).
These materials are toxicological and microbiological classified
as safe and in accordance with DIN 50930-6.

www.rosemount.com

NOTE
The requirements of CRN are met when a Rosemount 2120 CSA
IS-approved (I6 code) vibrating fork level switch model is configured
with 316/316L stainless steel (1.4401/1.4404) wetted parts and either
NPT threaded or 2 to 8-in. ASME B16.5 flanged process connections.

Hazardous locations certifications

North american approvals
Factory Mutual (FM) explosion-proof approval
E5

Project ID: 3012658

Explosion-proof for Class I, Div. 1, Groups A, B, C, and D
Temperature Class: T6 (Tamb 40 to 75 C)
Enclosure: Type 4X

Factory Mutual (FM)

intrinsically safe approval and non-incendive
I5

Project ID: 3011456

Intrinsically Safe for Class I, Div. 1, Groups A, B, C, and D
Class I, Zone 0, AEx ia IIC
Non-incendive for Class I, Div. 2, Groups A, B, C, and D
Class I, Zone 2, IIC
Temperature Code: T5 (Tamb 40 to 80 C, Tproc < 80 C)
Control Drawing: 71097/1154 (with NAMUR electronics)
Control Drawing: 71097/1314 (with 8/16 mA electronics)

11

Rosemount 2120

NOTE
A certified isolating amplifier or barrier must be used for intrinsic safety.

Canadian approvals

April 2014

Rest of the world approvals

International Electrotechnical Commission (IEC)
flameproof and dust-proof approval
E7

Canadian Standards Association (CSA) explosion-proof

E6

Project ID: 1786345

Explosion-proof for Class I, Div. 1, Groups A, B, C, and D
Temperature Class: T6 (Tamb 40 to 75 C)
Enclosure: Type 4X
Single seal

Canadian Standards Association (CSA)

intrinsically safe and non-incendive
I6

Certificate Number: 06 CSA 1786345

Intrinsically Safe for Class I, Div. 1, Groups A, B, C, and D
Class 1, Zone 0, Ex ia IIC
Non-Incendive for Class I, Div. 2, Groups A, B, C, and D
Temperature Code: T5 (Tamb 40 to 80 C, Tproc < 80 C)
Control Drawing: 71097/1179 (with NAMUR electronics)
Control Drawing: 71097/1315 (with 8/16 mA electronics)

Certificate: IECEx SIR 06.0051X

Flameproof and dust-proof:
Ex d IIC T6...T2 Ga/Gb
Ex tb IIIC T85C...T265C Db

International Electrotechnical Commission (IEC)

intrinsically safe approval
I7

Certificate: IECEx SIR 06.0070X

Intrinsically Safe for gas and dust atmospheres:
Ex ia IIC T5...T2 Ga
Ex ia IIIC T85 C...T265 C Da

NOTE
A certified isolating amplifier or barrier must be used for intrinsic safety.

Single seal
NOTE
A certified isolating amplifier or barrier must be used for intrinsic safety.

European approvals
ATEX flameproof and dust-proof approval
E1

Certificate: Sira 05ATEX1129X

Flameproof and dust-proof:
ATEX Marking
II 1/2 G D
Ex d IIC T6...T2 Ga/Gb
Ex tb IIIC T85 C...T265 C Db

ATEX intrinsically safe approval

I1

Certificate: Sira 05ATEX2130X

Intrinsic Safety for gas and dust environments:
ATEX Marking
II 1 G D
Ex ia IIC T5...T2 Ga
Ex ia IIIC T85 C...T265 C Da

NOTE
A certified isolating amplifier or barrier must be used for intrinsic safety.

12

www.rosemount.com

April 2014

Rosemount 2120

Dimensional drawings
3

/4 and 1-in. threaded mounting (standard length) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 13

/4 and 1-in. thread mounting (extended length) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14

2-in. thread mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 15

Flange mounting (standard length) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 16
Flange mounting (extended length) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 17

/ and 1-in. threaded mounting (standard length)

3 4

Note: Dimensions are in inches (millimeters)

GLASS-FILLED NYLON HOUSING

ALUMINUM/SST HOUSING

3.5 (89)

Allow 1.2 (30)

To Remove Lid

Allow 1.2 (30)

To Remove Lid

4 (102)

5
(127)

4.7 (120)

5.9
(151)

D
2.7
(69

1.7
(44)

0.5 (13)
Switchpoint (When
Mounted Horizontally)

0.5 (13)
Switchpoint (When
Mounted Vertically)

2.7
(69)

D
1.7
(44)

0.5 (13)
Switchpoint (When
Mounted Horizontally)

0.5 (13)
Switchpoint (When
Mounted Vertically)

NOTE: FOR HYGIENIC 2120 DIMENSIONS, SEE TYPE 1 DRAWING DOWNLOADS ON WEB SITE

A. Cable Entry M20x1.5 or 1/2-in. NPT

B. Cable Entry M20x1.5 or 3/4-in. NPT
C. 1.6 (40) A/F Hexagon
D. 3/4-in. or 1-in. Thread

www.rosemount.com

13

Rosemount 2120

April 2014

/ and 1-in. thread mounting (extended length)

3 4

Note: Dimensions are in inches (millimeters)

GLASS-FILLED NYLON HOUSING

ALUMINUM/SST HOUSING

3.5 (90)

Allow 1.2 (30)

To Remove Lid

Allow 1.2 (30)

To Remove Lid

4 (102)

5.9
(151)

4.7 (120)

6.7
(171)

E(M)
E(M)

1.1 (28) for 1-in. Thread

0.9 (23) for 3/4-in. Thread
1.7
(44)

1.1 (28) for 1-in. Thread

0.9 (23) for 3/4-in. Thread
1.7
(44)

0.5 (13)
Switchpoint (When
Mounted Horizontally)

0.5 (13)
Switchpoint (When
Mounted Vertically)

0.5 (13)
Switchpoint (When
Mounted Vertically)

0.5 (13)
Switchpoint (When
Mounted Horizontally)

NOTE: FOR HYGIENIC 2120 DIMENSIONS, SEE TYPE 1 DRAWING DOWNLOADS ON WEB SITE
A. Cable Entry M20x1.5 or 1/2-in. NPT
B. Cable Entry M20x1.5 or 3/4-in. NPT
C. 1.6 (40) A/F Hexagon
D. 3/4-in. or 1-in. Thread

Table 6. Fork length for 3/4 and 1-in. threaded 2120

Process
Connection
3

/4-in. Thread
1-in. Thread

Standard Length
Fork Length Code A

Minimum Length
Fork Length Code E (M)

Maximum Length
Fork Length Code E (M)(1)

1.7 in. (44 mm)

1.7 in. (44 mm)

3.75 in. (95 mm)

3.74 in. (94 mm)

157.5 in. (4000 mm)

157.5 in. (4000 mm)

(1) Maximum extended length of fork with hand-polished option is 39.4 in. (1000 mm).

14

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April 2014

Rosemount 2120

2-in. thread mounting

Note: Dimensions are in inches (millimeters)

GLASS-FILLED NYLON HOUSING

ALUMINUM/SST HOUSING

3.5 (90)

Allow 1.2 (30)

To Remove Lid

Allow 1.2 (30)

To Remove Lid

4 (102)

6.1
(154)

4.7 (120)

6.9
(175)

E(M)
E(M)

1.1 (28)
1.7
(44)

1.1 (28)
0.5 (13)
Switchpoint (When
Mounted Horizontally)
1.7
(44)

0.5 (13)
Switchpoint (When
Mounted Vertically)

0.5 (13)
Switchpoint (When
Mounted Vertically)

0.5 (13)
Switchpoint (When
Mounted Horizontally)

A. Cable Entry M20x1.5 or 1/2-in. NPT

B. Cable Entry M20x1.5 or 3/4-in. NPT
C. 2.6 (65) A/F Hexagon
D. 2-in. Thread

Table 7. Fork length for 2-in. threaded 2120

Process
Connection

Minimum Length
Fork Length Code E (M)

Maximum Length
Fork Length Code E (M)

2-in. Thread

3.74 in. (94 mm)

157.5 in. (4000 mm)

www.rosemount.com

15

Rosemount 2120

April 2014

Flange mounting (standard length)

Note: Dimensions are in inches (millimeters)

GLASS-FILLED NYLON HOUSING

ALUMINUM/SST HOUSING

3.5 (90)

Allow 1.2 (30)

To Remove Lid

Allow 1.2 (30)

To Remove Lid

4 (102)

4.8
(121)

4.7 (120)

6
(154)

1.1 (28) for 11/2 in. or Larger Flange

0.9 (23) for up to 1 in. Flange

4
(102)
1.7
(44)
0.5 (13)
Switchpoint (When
Mounted Horizontally)

0.5 (13)
Switchpoint (When
Mounted Vertically)

1.1 (28) for 11/2 in. or

Larger Flange;
0.9 (23) for up to 1 in. Flange

4.0
(102)
1.7
(44)
0.5 (13)
Switchpoint (When
Mounted Horizontally)

0.5 (13)
Switchpoint (When
Mounted Vertically)

A. Cable Entry M20x1.5 or 1/2-in. NPT

B. Cable Entry M20x1.5 or 3/4-in. NPT

16

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April 2014

Rosemount 2120

Flange mounting (extended length)

Note: Dimensions are in inches (millimeters)

GLASS-FILLED NYLON HOUSING

ALUMINUM/SST HOUSING

3.5 (89)

Allow 1.2 (30)

To Remove Lid

4 (102)
Allow 1.2 (30)
To Remove Lid

4.8
(121)

4.7 (120)

6
(154)
B

E(M)

1.1 (28) for 11/2 in. or

Larger Flange;
0.9 (23) for up to 1 in. Flange
1.7
(44)

0.5 (13)
Switchpoint (When
Mounted Vertically)

0.5 (13)
Switchpoint (When
Mounted Horizontally)

1.1 (28) for 11/2 in. or

Larger Flange;
0.9 (23) for up to 1 in. Flange

E(M)

1.7
(44)
0.5 (13)
Switchpoint (When
Mounted Horizontally)

0.5 (13)
Switchpoint (When
Mounted Vertically)

A. Cable Entry M20x1.5 or 1/2-in. NPT

B. Cable Entry M20x1.5 or 3/4-in. NPT

Table 8. Fork length for flanged 2120

Process Connection Material

Standard Length
Model Code H

Minimum Length
Model Code E (M)

Maximum Length
Model Code E (M)

Stainless steel(1)
ECTFE/PFA co-polymer coated
Alloy C and Alloy C-276

4 (102)
4 (102)
4 (102)

3.5 (89)
3.5 (89)
3.5 (89)

157.5 (4000)
59.1 (1500)
157.5 (4000)

(1) Maximum extended length of fork with hand-polished option is 39.4 in. (1000 mm).

www.rosemount.com

17

Rosemount 2120

Product Data Sheet

00813-0100-4030, Rev GD

April 2014

Emerson Process Management

Rosemount Inc.
8200 Market Boulevard
Chanhassen, MN 55317 USA
T (USA) 1 800 999 9307
T (International) +1 952 906 8888
F +1 952 906 8889
www.rosemount.com

Emerson Process Management

Neuhofstrasse 19a
CH 6341 Baar
Switzerland
T +41 (0) 41 768 61 11
F +41 (0) 41 76 1 87 40
www.rosemount.com

Emerson Process Management

Asia Pacific Pte Ltd
1 Pandan Crescent
Signapore 128461
T +65 6777 8211
F +65 6777 0947
Service Support Hotline: +65 6770 8711
Email: Enquiries@AP.EmersonProcess.com
www.rosemount.com

Emerson Process Management

Latin America
1300 Concord Terrace, Suite 400
Sunrise Florida 33323 USA
T + 1 954 846 5030
www.rosemount.com

Standard Terms and Conditions of Sale can be found at www.rosemount.com\terms_of_sale

The Emerson logo is a trade mark and service mark of Emerson Electric Co.
Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
PlantWeb is a registered trademark of one of the Emerson Process Management group of companies.
HART and WirelessHART are registered trademarks of the HART Communication Foundation
All other marks are the property of their respective owners.
2014 Rosemount Inc. All rights reserved.