Rosemount 2521 Specifications
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
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
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
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
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
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
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