Page 1
Product Data Sheet
00813-0100-2521, Rev AB
Rosemount™ 2521 Solids Level Switch
Vibrating Fork
January 2020
■
Very high sensitivity (<5 g/l)
■
High quality 316 stainless steel material for the process
■
Suitable for process pressures up to 232 psi (16 bar)
■
Temperature range from -40 to 302 °F (-40 to 150 °C)
■
Extremely robust short-fork versions
Page 2
Rosemount 2521 January 2020
Introduction
Measurement principles
The Rosemount™ 2521 Solids Level Switch uses the principle of a tuning fork and a piezo-electric crystal to oscillate the forks at their
natural frequency. Changes to the oscillation frequency are continuously monitored by electronics which varies depending on
whether the fork is covered or uncovered by a solids medium.
When the solids medium in the vessel (silo) falls away from the fork, it causes a change of oscillation frequency that is detected by
the electronics and the output switches to indicate an 'uncovered' state.
When the solids medium in the vessel (silo) rises and covers the fork, it causes a change of oscillation frequency that is detected by
the electronics and the output switches to indicate a 'covered' state.
The electrical output will vary depending on the electronics selected.
Key features and benefits
■
Enhanced version of the vibrating fork with extra sensitivity options
■
Available as a standard fork length and tube/cable extended fork lengths
■
Ideal for use on bulk solids - particularly suitable for use in fine-grained and powdered materials
■
Suitable for hygienic applications - polished forks and wetted parts made from stainless steel
■
Short fork design allows mounting in small pipes or process vessels with very limited space
■
Versatile installation, may be installed in vertical, horizontal, or angled positions
■
Modular and simple design
■
Available with separate electronic housing
■
Reliable, simple, and maintenance-free measurement principle
■
Robust aluminum die-cast housing with IP66 protection
■
Adjustable signal output time delay
Contents
Introduction...................................................................................................................................................................................... 2
Ordering information........................................................................................................................................................................ 4
Spares and accessories...................................................................................................................................................................... 7
Specifications.................................................................................................................................................................................... 8
Product certifications...................................................................................................................................................................... 11
Dimensional drawings..................................................................................................................................................................... 12
2 Emerson.com/Rosemount
Page 3
January 2020 Rosemount 2521
Applications
■
Applications with high mechanical loading
■
Materials with very light product density
■
Applications requiring pneumatic filling
■
Silos/vessels with limited space
■
Vibration within the vessel
■
High reliability requirements
Emerson.com/Rosemount 3
Page 4
Rosemount 2521 January 2020
Ordering information
Table 1: Rosemount 2521 Ordering Information
The starred offerings (★) represent the most common options and should be selected for best delivery. The non-starred offerings
are subject to additional delivery lead time.
Model Product description
2521 Level Switch - Enhanced Vibrating Fork ★
Fork profile
S Standard sensitivity, 3 lb/ft3 (50 g/l), dry and wet applications ★
H High sensitivity, 1.2 lb/3 (20 g/l) ★
Thermal profile
(1)
M Without extension tube (up to T
(2)
E
(2)
R
(2)
S
C With cable extension (T
With extension tube (up to T
With remote housing cable 59-in. (1500 mm) long (up to T
With remote housing cable 157-in. (4000 mm) long (up to T
: -13 to 176 °F (-25 to 80 °C), T
proc
= 302 °F (150 °C) at T
proc
= 302 °F (150 °C) at T
proc
<= 104 °F (40 °C)) ★
amb
> 104 °F (40 °C)) ★
amb
= 302 °F (150 °C) ★
proc
= 302 °F (150 °C) ★
proc
: -13 to 140 °F (-25 to 60 °C)) ★
amb
Materials of construction: process connection/process extension tube
D 304/321 Stainless steel (1.4301/1.4541) ★
(3)
S
316L Stainless steel (1.4404) ★
Conduit entry/cable threads
1 M20 x 1.5, 1 off screwed cable gland for CE, ATEX, and IECEx ★
2 M20 x 1.5, 2 off screwed cable glands ★
4 ½-in. NPT tapered ANSI B1.20.1 (1 off conduit + 1 off Ex-d blind plug) ★
Process connection size
5 1½ in./40 mm (DN40)/40A ★
2 2 in./50 mm (DN50)/50A ★
3 3 in./80 mm (DN80)/80A ★
4 4 in./100 mm (DN100)/100A ★
Process connection rating Sizes
AA ASME B16.5 Class 150 flange All except 5 ★
DZ EN 1092-1 PN6 flange 4 ★
DA EN 1092-1 PN16 flange 4 ★
NN For use with non-flange process connection type 2 and 5 ★
Process connection type Ratings
F Flat-face flange DZ and DA ★
R Raised-face flange AA ★
B BSPT (R) thread NN ★
4 Emerson.com/Rosemount
Page 5
January 2020 Rosemount 2521
Table 1: Rosemount 2521 Ordering Information (continued)
G BSPP (G) thread NN ★
N NPT thread NN ★
(3)
C
Electronic type
E Relay SPDT 19 to 230 Vac / 19 to 55 Vdc ★
Fork length Fork profiles
(3)
A
(3)
B
(3)
E
(3)
M
(4)
F
(4)
N
Specific extended fork length
00000 Factory default length (only if fork length A or B is selected) ★
Tri Clamp NN ★
Standard length 6.47 in. (165 mm) S ★
Standard length 9.25 in. (235 mm), or 10.24-in (260 mm) for Fork Sensitivity V1/V2/V3 H ★
Extended tube, customer-specified length in tenths of inches All ★
Extended tube, customer-specified length in millimeters All ★
Extended cable, customer-specified length in tenths of inches All ★
Extended cable, customer-specified length in millimeters All ★
XXXXX Specific customer-specified tube/cable length in tenths of inches (XXXX.X inches) or millimeters (XXXXX mm) ★
Product certifications Conduit entry
NA No hazardous locations certifications All ★
(5)
ND
NK
E2
E7
E8
EM
I1
I2
I7
IM
K1
K2
K5
K7
KB
KM
KY
KZ
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
ATEX, dust certification All
IECEx, dust certification All
INMETRO Flameproof 4
IECEx Flameproof/Dust certification 4
ATEX Flameproof/Dust certification 4
(5)
Technical Regulations Customs Union (EAC), dust certification All
ATEX Intrinsic Safety and Dust certification All
INMETRO Intrinsic Safety All
IECEx Intrinsic Safety and Dust certification All
Technical Regulations Customs Union (EAC), Intrinsic Safety All
ATEX Flameproof/Increased Safety/Dust certification All
INMETRO Intrinsic Safety, Flameproof All
American Intrinsically Safe and Explosion-proof 4
IECEx Flameproof/Increased Safety/Dust certification All
American and Canadian, DIP 4
(5)
Technical Regulations Customs Union (EAC), Flameproof/Increased Safety/Dust All
American and Canadian Flameproof/Dust certification 4
American and Canadian Ordinary Location (Unclassified, safe area) certification 4
Emerson.com/Rosemount 5
Page 6
Rosemount 2521 January 2020
Table 1: Rosemount 2521 Ordering Information (continued)
Options (include with selected model number)
Calibration data certification
Q4 Certificate of functional test ★
Weather protection
P2 Weather protection cover ★
Fork sensitivity Thermal profiles
(6)
V1
V2
(6)
V3
(8)
V4
Sliding sleeve
(9)
S2
Extended product warranty
WR5 5-year limited warranty ★
Enhanced (> 0.3 lb/ft3 (5 g/l) M, E, and C ★
(6)(7)
Enhanced (< 0.3 lb/ft3 (5 g/l) with increased vibrating surface (aluminum) M, E, and C ★
Enhanced (< 0.3 lb/ft3 (5 g/l) M, E, and C ★
Adjustable sensitivity for interface applications M, E, and C ★
Sliding sleeve, maximum 232 psi (16 bar), maximum 302 °F (150 °C) ★
Typical model number: 2521 S M D 1 5 NN B E A 00000 NA
(1)
There are two adjustable settings, A and B on the electronics board. See Operating conditions for how the minimum density requirements are
affected by the Fork Profile option codes.
(2)
A thermal extension cable or tube (temperature-extended shaft) moves the electronics further away from high process temperatures. Select this
extension when ambient temperatures are greater than 104 °F (40 °C). See Operating conditions and Dimensional drawings for further
information.
(3)
Not available when Thermal Profile code C is selected.
(4)
Available only when Thermal Profile code C is selected.
(5)
Please contact your local Emerson representative for the availability of this option.
(6)
Available only when Fork Profile code H is selected (for high sensitivity).
(7)
This option requires a 4-in. flanged process connection to be selected.
(8)
Available only when Fork Profile code S is selected (for standard sensitivity in wet and dry applications) and Product Certification code NA is
selected. The potentiometer on the electronics board may then be used to fine-tune the sensitivity.
(9)
The sliding sleeve option requires an extended fork length.
6 Emerson.com/Rosemount
Page 7
January 2020 Rosemount 2521
Spares and accessories
The specification and selection of product materials, options, or components must be made by the purchaser of the equipment.
See Materials selection for more information.
The starred offerings (★) represent the most common options and should be selected for best delivery. The non-starred offerings
are subject to additional delivery lead time.
Table 2: Spares
Part number Description
02500-1000-0069 Electronics board: Relay SPDT 19 to 230 Vac, 19 to 55 Vdc, Fork Profile code S ★
02500-1000-0080 Electronics board: Relay SPDT 19 to 230 Vac, 19 to 55 Vdc, Fork Profile code H ★
02500-1000-0081 Electronics board: Relay SPDT 19 to 230 Vac, 19 to 55 Vdc, Fork Sensitivity code V1 ★
02500-1000-0082 Electronics board: Relay SPDT 19 to 230 Vac, 19 to 55 Vdc, Fork Sensitivity code V3 ★
02500-1000-0083 Electronics board: Relay SPDT 19 to 230 Vac, 19 to 55 Vdc, Fork Sensitivity code V2 ★
Table 3: Accessories
Part number Description
02500-7500-0002 Mounting kit 1 for DN100 PN6 and EN1092-1 flange with ø18 mm holes, containing:
4 off M16 x 60 mm screws (A2-grade stainless steel)
4 off M16 nuts
4 off washers
1 off seal (non-food grade) for up to 464 °F (240 °C)
02500-7500-0005 Mounting kit 2 for DN100 PN6 and EN1092-1 flange with M16 threaded holes, containing:
4 off M16 x 40 mm screws (A2-grade stainless steel)
4 off washers
1 off seal (non-food grade) for up to 464 °F (240 °C)
02500-7500-0008 Mounting kit 3 for DN100 PN16 and EN1092-1 flange with ø18 mm holes, containing:
8 off M16 x 60 mm screws (A2-grade stainless steel)
8 off M16 nuts
8 off washers
1 off seal (non-food grade) for up to 464 °F (240 °C)
02500-7500-0011 Mounting kit 4 for DN100 PN16 and EN1092-1 flange with M16 threaded holes, containing:
8 off M16 x 40 mm screws (A2-grade stainless steel)
8 off washers
1 off seal (non-food grade) for up to 464 °F (240 °C)
★
★
★
★
Emerson.com/Rosemount 7
Page 8
Rosemount 2521 January 2020
Specifications
Electrical data
Connection terminals
Cable entry options
Signal output delay
Safety operation (FSL,FSH)
Sensitivity
Vibration frequency
Installation category
Pollution degree
Electronics
Power supply
Maximum ripple of power
supply
Maximum installed load
Signal output
Intrinsically Safe (IS) ratings
Status of signal output
Isolation
Protection class
4 mm2 (AWG 12), maximum
M20 × 1.5 screwed cable gland
½-in. NPT conduit connection
Clamping range (diameter) of the factory provided cable glands:
0.24 to 0.47 in. (6 to 12 mm) for M20 × 1.5
1 second for uncovered-to-covered switchover
1 to 2 seconds for covered-to-uncovered switchover
Configurable switches for each signal output. Select Fail Safe High (FSH) or Fail Safe Low (FSL)
depending on application.
Adjustable, two settings (A or B)
Rosemount 2521S: 350 Hz
Rosemount 2521H: 125 Hz (standard) or 90 Hz (enhanced sensitive options V1 to V3)
II
2 (inside housing)
Universal voltage SPDT relay
19 to 230 Vac 50/60 Hz ±10%
19 to 55 Vdc ±10%
7 Vss at dc
8 VA, 1.5 W
Floating relay SPDT
Maximum 250 Vac, 8 A (non-inductive)
Maximum 30 Vdc, 5 A (non-inductive)
The Rosemount 2521 must only be installed in non-hazardous areas (unclassified locations).
Indicated by a built-in LED
Power supply to signal output:
2225 Vrms
I
8 Emerson.com/Rosemount
Page 9
T
amb
T
process
T
amb
T
process
A
B, C
A
B C
212˚F
(100 ˚C)
302 ˚F
(150˚C)
140 ˚F
(60 ˚C)
104 ˚F
(40 ˚C)
Ø1.97 in.
(Ø50 mm)
7.08 in.
(180 mm)
January 2020 Rosemount 2521
Mechanical data
Housing
Cable of separate housing
Degree of protection
Process connection and
extension
Fork
Maximum noise level
Overall weight
(approximated)
Aluminum housing, powder coated
Seal between housing and lid: NBR
Seal between housing and process connection: NBR
Nameplate: polyester film
Silicone elastomer, ø10 mm (ø0.39 in.), surface resistance < 109 Ohm, UV-resistent, minimum
bend radius of 1.97 in. (50 mm)
NEMA® Type 4X, IP66 (IEC/EN 60529)
Materials:
1.4301/1.4404 stainless steel (304/316L)
Flanges: 1.4541 stainless steel (321)
Extension cable: PUR with black carbon (not food grade)
Thread: R 1½-in. tapered (EN 10226) or 1½-in. NPT tapered (ANSI B 1.20.1)
Tri Clamp: 1.4301/1.4404 stainless steel (304/316L), 2-in. (DN50) ISO 2852
1.4581 stainless steel, food grade
Surface finish: polished, Ra < 0.75 μm; PTFE (on request)
50 dBA
Standard length version: 4.6 lbs (2.1 kg)
Tube/shaft extended length version: 4.6 lbs + 5.5 lbs per 39.3 in. (2.1 kg + 2.5 kg per m)
Cable extended length version: 9.9 lbs + 1.1 lbs per 39.3 in. (4.5 kg + 0.5 kg per m)
Operating conditions
Ambient temperature
(housing)
Process temperature
Emerson.com/Rosemount 9
-40 to +140 °F (-40 to +60 °C) All except cable-extended versions
-13 to +140 °F (-25 to +60 °C) Cable-extended versions
-40 to +302 °F (-40 to +150 °C) All except cable-extended versions
Mounting for process temperature up to 150 °C (302 °F): see graph
-13 to +176 °F (-25 to +80 °C) Cable-extended versions
Page 10
Rosemount 2521 January 2020
Ventilation
Minimum powder
density requirements
Bulk material
requirements
Maximum mechanical
load
Maximum mechanical
torque
Maximum tractive force
Maximum process
pressure
Vibration
Relative Humidity
Maximum altitude
Expected product
lifetime
Ventilation is not required.
Setting B: Setting A:
Rosemount 2521S 3 lb/ft3 (50 g/l) 9 lb/ft3 (150 g/l)
Rosemount 2521H 1.2 lb/ft3 (20 g/l)
0.3 lb/ft3 (5 g/l)
No strong tendency to cake or deposit.
Maximum 0.39 in. (10 mm) grain size.
600 N laterally (on the forks)
Fit a protective angled (reverse-V shaped) shield to the vessel, directly above the level switch, when
mechanical loads are high.
300 Nm Tube/shaft-extended versions
2 kN Cable-extended versions
232 psi (16 bar)
87 psi (6 bar)
The maximum overall process pressure may be reduced, depending on the selected flange. Refer to
the flange standards for pressure ratings and pressure de-ratings at higher temperatures.
1.5 (m/s2)2/Hz according to EN 60068-2-64
0 to 100%, suitable for outdoor use
6562 ft. (2000 m)
The following parameters have a negative influence on the expected product lifetime:
High ambient- and process temperatures, corrosive environments, high plant vibration, and a high
flow rate of abrasive bulk material.
Standard length and tube/shaft extended versions
Cable-extended versions
4.5 lb/ft3 (75 g/l) for standard
sensitivity
1.2 lb/ft3 (20 g/l) for enhanced
sensitivity
Transport and storage
Transport
Storage
10 Emerson.com/Rosemount
Refer to the instructions as stated on the transport packaging, otherwise the products may get
damaged.
Transport temperature: -40 to +176 °F (-40 to +80 °C)
Transport humidity: 20 to 85%
Always inspect the received goods for any damage occurred during shipment from the factory. Notify
Emerson of damaged goods as soon as possible.
Products must be stored at a dry and clean place. They must be protected from influence of corrosive
environments, vibrations, and exposure to direct sunlight.
Storage temperature: -40 to +176 °F (-40 to +80 °C)
Storage humidity: 20 to 85%
Page 11
January 2020 Rosemount 2521
Product certifications
European Union directive information
A copy of the EU Declaration of Conformity can be found at the end of the Rosemount 2521 Quick Start Guide . The most recent
revision of the EU Declaration of Conformity can be found at Emerson.com/Rosemount.
Emerson.com/Rosemount 11
Page 12
6.5
(165)
3.94
(100)
Ø1.65
(Ø42)
A
B
C
5.31 (135)
4.92
(125)
Ø4.72 (Ø120)
6.3
(160)
A
E
Ø0.39
(Ø10)
2.36
(60)
D
F
G
Rosemount 2521 January 2020
Dimensional drawings
Figure 1: Rosemount 2521S Vibrating Fork Level Switch (Standard Length, Standard Fork Sensitivity)
A. Thread
B. Tri Clamp
C. Flange
D. Thermal extension tube (temperature-extended shaft)
E. Separate housing option
F. Conduit/cable entries
G. Aluminum housing
Dimensions are in inches (millimeters).
12 Emerson.com/Rosemount
Page 13
3.94
(100)
Ø1.65
(Ø42)
A
B
C
5.31 (135)
4.92
(125)
E
Ø0.39
(Ø10)
A
2.36
(60)
6.3
(160)
D
Ø4.72 (Ø120)
F
G
11.8 to 157.5
(300 to 4000)
January 2020 Rosemount 2521
Figure 2: Rosemount 2521S Vibrating Fork Level Switch (Tube-extended Length, Standard Fork Sensitivity)
A. Thread
B. Flange
Tri Clamp
C.
D. Thermal extension tube (temperature-extended shaft)
E. Separate housing option
F. Conduit/cable entries
G. Aluminum housing
Dimensions are in inches (millimeters).
Emerson.com/Rosemount 13
Page 14
11.8 to 157.5
(300 to 4000)
11.8 to 157.5
(300 to 4000)
Ø1.65
(Ø42)
Ø1.65
(Ø42)
7.68
(195)
3.94
(100)
3.94
(100)
6.1
(155)
6.1
(155)
Ø1.65
(Ø42)
Ø1.65
(Ø42)
5.31 (135)
4.92
(125)
Ø4.72 (Ø120)
7.68
(195)
B
A
C
D D
Rosemount 2521 January 2020
Figure 3: Rosemount 2521S Vibrating Fork Level Switch (Cable Extension, Standard Fork Sensitivity)
A. Thread
B. Flange
C.
Conduit/cable entries
D. Aluminum housing
Dimensions are in inches (millimeters).
14 Emerson.com/Rosemount
Page 15
H
I
Ø1.65
(Ø42)
B
A
C
A
E
Ø0.39
(Ø10)
D
5.31 (135)
4.92
(125)
Ø4.72 (Ø120)
F
G
6.3
(160)
2.36
(60)
January 2020 Rosemount 2521
Figure 4: Rosemount 2521H Vibrating Fork Level Switch (Standard Length, Enhanced Fork Sensitivity)
A. Thread
B. Flange
C.
Tri Clamp
D. Thermal extension tube (temperature-extended shaft)
E. Separate housing option
F. Conduit/cable entries
G. Aluminum housing
H. Dimension L (see Table 4)
I. Dimension X (see Table 4)
Dimensions are in inches (millimeters).
Table 4: Dimensions L and X
Dimension Fork sensitivity options
Without option Options (V1, V2
L 9.25 in. (235 mm) 10.24 in. (260 mm)
X 6.69 in. (170 mm) 7.68 in. (195 mm)
(1)
Option V2 is only available on a Rosemount 2521 with a 4-in. DN100 flanged process connection.
(1)
and V3)
Emerson.com/Rosemount 15
Page 16
Ø1.65
(Ø42)
H
A
B
C
A
D
E
Ø0.39
(Ø10)
2.36
(60)
5.31 (135)
4.92
(125)
Ø4.72 (Ø120)
6.3
(160)
F
G
11.8 to 157.5
(300 to 4000)
Rosemount 2521 January 2020
Figure 5: Rosemount 2521H Vibrating Fork Level Switch (Tube-extended Length, Enhanced Fork Sensitivity)
A. Thread
B. Flange
C.
Tri Clamp
D. Thermal extension tube (temperature-extended shaft)
E. Separate housing option
F. Conduit/cable entries
G. Aluminum housing
H. Dimension X (see Table 5)
Dimensions are in inches (millimeters).
Table 5: Dimension X
Dimension Fork sensitivity options
Without option Options V1, V2
X 6.69 in. (170 mm) 7.68 in. (195 mm)
(1)
Option V2 is only available on a Rosemount 2521 with a 4-in. DN100 flanged process connection.
(1)
and V3
16 Emerson.com/Rosemount
Page 17
5.31 (135)
4.92
(125)
C
D
Ø4.72 (Ø120)
29.6 to 787
(750 to 20000)
29.6 to 787
(750 to 20000)
7.68
(195)
E
6.1
(155)
7.68
(195)
E
6.1
(155)
Ø1.65
(Ø42)
Ø1.65
(Ø42)
Ø1.65
(Ø42)
Ø1.65
(Ø42)
B
A
January 2020 Rosemount 2521
Figure 6: Rosemount 2521H Vibrating Fork Level Switch (Cable Extension, Enhanced Fork Sensitivity)
A. Thread
B. Flange
Conduit/cable entries
C.
D. Aluminum housing
E. Dimension X (see Table 5)
Dimensions are in inches (millimeters).
Emerson.com/Rosemount 17
Page 18
Rosemount 2521 January 2020
18 Emerson.com/Rosemount
Page 19
January 2020 Rosemount 2521
Emerson.com/Rosemount 19
Page 20
00813-0100-2521
Rev. AB
January 2020
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Emerson Terms and Conditions of Sale are available upon request. The Emerson logo is a
trademark and service mark of Emerson Electric Co. Rosemount is a mark of one of the
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