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2521
Condensed Guide [fr]
40 pgs940.08 Kb0
Manuals & Guides [bg]
36 pgs2.38 Mb0
Manuals & Guides [es]
40 pgs934.48 Kb0
Manuals & Guides [pl]
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Operating Manual
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Quick Start Guide [hr]
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Quick Start Guide [pt]
40 pgs862.91 Kb0
Specifications
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Table of contents
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Rosemount 2521 Operating Manual

Download
Quick Start Guide
00825-0100-2521, Rev AA
October 2019
Rosemount™ 2521 Solids Level Switch
Vibrating Fork
Contents
2 Quick Start Guide

1 Introduction

The level switch detects the presence and absence of a process media at its installation point, and reports it as a switched electrical output.
Note
Other language versions of this Quick Start Guide can be found at
Emerson.com/Rosemount.

1.1 Safety messages

NOTICE
Read this manual before working with the product. For personal and system safety, and for optimum product performance, ensure you thoroughly understand the contents before installing, using, or maintaining this product.
For technical assistance, contacts are listed below:
Customer Central
Technical support, quoting, and order-related questions.
• United States - 1-800-999-9307 (7:00 am to 7:00 pm CST)
• Asia Pacific- 65 777 8211
North American Response Center
Equipment service needs.
• 1-800-654-7768 (24 hours a day — includes Canada)
• Outside of these areas, contact your local Emerson representative.
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.
Quick Start Guide 3
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.
Explosions could result in death or serious injury.
• The level switch must only be installed and operated in non-hazardous
(ordinary) locations.
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.
Process leaks could result in death or serious injury.
• Ensure the level switch is handled carefully. If the process seal is
damaged, gas or dust might escape from the silo (or other vessel)
Any substitution of non-recognized parts may jeopardize safety. Repair, e.g. substitution of components, etc. may also jeopardize safety and is under no circumstances allowed.
• 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.
4 Quick Start Guide
CAUTION
The products described in this document are NOT designed for nuclear­qualified applications.
• Using non-nuclear qualified products in applications that require
nuclear-qualified hardware or products may cause inaccurate readings.
• For information on Rosemount nuclear-qualified products, contact your
local Emerson Sales Representative.
Individuals who handle products exposed to a hazardous substance can avoid injury if they are informed of and understand the hazard.
• If the product being returned was exposed to a hazardous substance as
defined by Occupational Safety and Health Administration (OSHA), a copy of the required Safety Data Sheet (SDS) for each hazardous substance identified must be included with the returned level switch.

1.2 Applications

A Rosemount™ 2521 Solids Level Switch is used for monitoring the level of bulk materials in all types of containers and silos.
The level switch can be used with all powdery and granulated bulk materials that do not show a strong tendency to form crusts or deposits. The detection of solids in a liquid is also possible
Typical applications are:
• Building materials — Lime, extruded polystyrene foam (XPS), molding sand, etc.
• Food and beverage — Milk powder, flour, salt, etc.
• Plastics — Plastic granulates, etc.
• Timber
• Chemicals
The level switch has a threaded, flanged, or Tri Clamp process connection for mounting it onto a silo (or other vessel). You can mount it on a side wall of the silo, so that it is level with the filling limit to be monitored. Alternatively, if it has an extended length, mount it vertically on top of a silo to monitor the maximum filling limit.
The length of the fork can be up to 157.5 in. (4 m) with an extension tube.
Quick Start Guide 5
A
B
C
C
C
D
The use of a sliding sleeve is recommended so that the switching point can be changed easily during the live operation of the level switch.
Figure 1-1: Typical Installation Examples
A. Rosemount 2521 with the cable-extended fork length B. Rosemount 2521 with the tube-extended fork length and thermal tube-
extension
C. Rosemount 2521 with the standard length fork
D. Optional sliding sleeve
6 Quick Start Guide
A
C
D
B
B
B
Figure 1-2: Detection of solids in water
A. Rosemount 2521 with the tube-extended fork length and thermal tube-
extension
1.3
B. Rosemount 2521 with the standard length fork C. Optional sliding sleeve
D. Solids in water

Measurement principles

Using the principle of a tuning fork, a piezo-electric crystal oscillates 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.
Quick Start Guide 7
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 when the Rosemount 2521 was ordered.
8 Quick Start Guide

2 Mechanical installation

2.1 Mounting considerations

Before mounting the level switch on a silo (or other vessel), review the safety and pre-mounting sections.

2.1.1 Safety

General safety
1. Installation of this equipment shall be carried out by suitably trained personnel, in accordance with the applicable code of practice.
2. If equipment is likely to come into contact with aggressive substances, it is the user’s responsibility to take suitable precautions that prevent it from being adversely affected, thus ensuring the type of protection is not compromised.
a. Aggressive substances: e.g. acidic liquids or gases that may
attack metals or solvents that may affect polymeric materials.
b. Suitable precautions: e.g. regular checks as part of routine
inspections or establishing from a material's data sheet that it is resistant to specific chemicals.
3. It is the responsibility of the installer to:
a. Take protective measures, such as fitting an angled shield
(reverse V shape) to the silo or selecting an extension tube option, when there are high mechanical forces.
b. Ensure that the process connection is tightened by the
correct amount of torque and sealed to prevent process leaks.
4. Technical data
a. The Rosemount 2521 Product Data Sheet has all the technical
specifications. See Emerson.com/Rosemount for other language versions.
Quick Start Guide 9
B
A

2.1.2 Solids in Water

The detection of solids in water is supported by the Rosemount 2521S only. An installation example can be seen in Figure 1-2.

2.1.3 Mechanical load

The load at the mounting point must not exceed 300 Nm (Rosemount 2521 with an extended length fork).
Figure 2-1: Maximum Mechanical Load
A. Mounting point B. Mechanical load

2.1.4 Vertical installations

Table 2-1 provides the maximum fork lengths and the corresponding
maximum deviations from a normal vertical installation.
Table 2-1: Maximum Vertical Deviation
Maximum deviation Maximum fork length
5° 157.5 in. (4000 mm)
45° 47.24 in. (1200 mm)
> 45° 23.62 in. (600 mm)
10 Quick Start Guide
A

2.1.5 Mounting location

Take time to assess a suitable mounting location. Avoid mounting the level switch near the filling point, internal structures, and walls of a silo (or other vessel). When mounting the extended length versions of the level switch, it is especially important to consider internal structures. Forcing the level switch into a small or congested space risks damage to the sensor and could impair the protection it provides.

2.1.6 Sliding sleeve

Tighten both M8 screws with a torque of 20 Nm to establish a seal and maintain the process pressure. See Figure 2-2.
Figure 2-2: Sliding Sleeve, M8 Screws
A. Two off M8 screws

2.1.7 Flange mounting

A suitable gasket must be fitted to provide a seal when the flanges are tightened.

2.1.8 Tightening threaded process connections

When tightening the threaded process connection of a Rosemount 2521:
• Use an open-ended wrench on the hexagonal boss of the level switch or
the sliding sleeve.
• Never tighten by using the housing.
• Do not exceed the maximum torque of 80 Nm.

2.1.9 Hygienic applications

The food-grade materials are suitable for use under normal and predictable hygienic applications (according to directive 1935/2004 Art.3). There are currently no hygienic certifications for the Rosemount 2521.

2.1.10 Vibrating forks

Bending, shortening, or extending the forks will damage the level switch.
Quick Start Guide 11
A
C
B

2.1.11 Rotatable housing and fork orientation mark

The housing of the level switch can be rotated against the threaded connection after mounting.
Figure 2-3: Housing Rotation and Fork Orientation Mark
A. Threaded process connection B. Housing C. Fork orientation mark on hexagonal boss (or sliding sleeve if fitted)

2.1.12 Orientation of cable glands

When the level switch is mounted horizontally, ensure the cable glands are pointed downwards to avoid water getting inside the housing. Unused conduit entries must be completely sealed with a suitably rated stopping (blanking) plug.

2.1.13 Seals

Apply PTFE tape to the threaded process connection. This is required for a silo (or other vessel) to maintain the process pressure.

2.1.14 Future maintenance

It is advisable to grease the screws of the housing cover (lid) when a corrosive atmosphere is present. This will help prevent difficulties when the cover needs to be removed during future maintenance tasks.

2.1.15 Switching point

Heavy bulk materials
The signal output switches over when the forks of the level switch are covered a few millimeters.
Light bulk materials
The signal output switches over when the forks of the level switch are covered a few centimeters.
12 Quick Start Guide
A
B
A
B
C
E
F
G
D
OK
OK
H

2.2 Mounting the level switch

Figure 2-4 shows how the level switch should be mounted.
Figure 2-4: Correct and Incorrect Mounting
A. Full-silo detection using the cable-extended fork length option B. Empty-silo detection using the cable-extended or tube-extended fork
length option
C. Sliding sleeve option
D. Bulk solids slide downwards more easily when the device is mounted at
an angle (recommended) E. Steel protection shield F. Installation in the conical part is only suitable for solids material
(powder) that will not build-up on the forks
G. Incorrect installation - the fork orientation is not allowing solids material
to pass between the forks. Check the orientation mark on the hexagon is
either facing upwards or downwards
H. Incorrect installation - the socket is too long and allows the solids
material to easily accumulate inside it. The forks must protrude into the
silo sufficiently to correctly detect the level
Quick Start Guide 13

3 Electrical installation

3.1 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.
Explosions could result in death or serious injury.
• The level switch must only be installed and operated in non-hazardous
(ordinary) locations.
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.
3.2

Wiring considerations

Note
See the Rosemount 2521 Product Data Sheet for the full electrical specifications.

3.2.1 Handling

In cases of improper handling or handling malpractice, the electrical safety of the device cannot be guaranteed.

3.2.2 Installation regulations

Local regulations or VDE 0100 (Regulations of German Electrotechnical Engineers) must be observed.
When using 24 V supply voltage, an approved power supply with reinforced insulation to mains is required.
14 Quick Start Guide

3.2.3 Fuse

Use a fuse as stated in the connection diagrams.

3.2.4 Residual Current Circuit Breaker (RCCB) protection

In case of a defect, the distribution voltage must automatically be cut-off by an RCCB protection switch to protect against indirect contact with dangerous voltages.

3.2.5 Power supply

Power supply switch
A voltage disconnection switch must be provided near the device.
Supply voltage
Compare the supply voltage applied with the specifications given on the electronic module and nameplate before switching on the device.

3.2.6 Wiring

Field wiring cables
The diameter has to match the clamping range of the used cable gland.
The cross-section has to match the clamping range of the connection terminals and the maximum current must be considered.
All field wiring must have insulation suitable for at least 250 Vac.
The temperature rating must be at least 194 °F (90 °C).
Use a shielded cable when there are electrical interferences present that are higher than stated in the EMC standards. Otherwise, an unshielded instrumentation cable can be used.
Wiring diagram
The electrical connections are made in accordance with the wiring diagram.
Guiding the cables in the terminal box
The field wiring cables must be cut to a length to be able to properly fit them into the terminal box.

3.2.7 Cable glands

Ensure the screwed cable gland safely seals the cable and is tight enough to prevent water ingress. Unused conduit or cable entries must be sealed with a stopping (blanking) plug.
Quick Start Guide 15
12
3 4 5
A
B
C

3.2.8 Conduit system

When a threaded conduit system is used instead of a cable gland, the regulations of the country must be observed. The conduit must have a ½-in. NPT tapered thread to match a NPT threaded conduit entry of the level switch and comply with ANSI B 1.20.1. Unused conduit entries must be closed tightly with a metal stopping (blanking) plug.

3.2.9 Connection terminals

When preparing cable wires for connection to terminals, the wire insulation must be stripped to show no more than 0.31 in. (8 mm) of the copper strands. Always check that the power supply is disconnected or switched-off to avoid coming into contact with dangerous live parts.

3.2.10 Relay and transistor protection

Provide protection for relay contacts and output transistors to protect the device against inductive load surges.

3.2.11 Static charging

The Rosemount 2521 must be grounded to avoid a static electrical build-up. This is particularly important for applications with pneumatic conveying and non-metallic containers.

3.3 Wiring the level switch

Figure 3-1: Connection Overview
A. Internal ground terminal - electronics connected to housing B. Connection terminals C. Protective conductor terminal - Protective Earth (PE)
16 Quick Start Guide
1
2 3 4 5
PE + -
L N
Wiring the SPDT relay
Power supply:
• 19 to 230 Vac (50/60 Hz) +10% 8 VA
• 19 to 55 Vdc +10% 1.5 W
Signal output (floating SPDT relay):
• Maximum 250 Vac, 8 A, non-inductive
• Maximum 30 Vdc, 5 A, non-inductive
Fuse on signal output: maximum 10 A, slow or fast, HBC, 250 V
Figure 3-2: Power supply and Signal Output Connections
Quick Start Guide 17
A
C
B

4 Configuration

4.1 Adjustment of the signal output

FSH signal output
When the level switch is used to indicate full-silo, set to Fail Safe High. A power failure or line break is regarded as full-silo signal (as protection against overfilling).
FSL signal output
When the level switch is used to indicate empty load, set to Fail Safe Low. A power failure or line break is regarded as empty-silo signal (as protection against running dry).
Figure 4-1: FSL and FSH Settings
A. Electronic module B. FSL setting (switch position up) C. FSH setting (switch position down)
18 Quick Start Guide
C
A
B

4.2 Sensitivity

The level switch is factory-set to high sensitivity (switch position B) and normally does not need to be changed. However, if the bulk solids material has a frequent tendency to cake or deposit, the setting switch can be set to position A to decrease the sensitivity of the probe .
Figure 4-2: Sensitivity Settings
A. Low sensitivity setting A (switch position down) B. High sensitivity setting B (switch position up) - factory default C. Electronics PCB
Table 4-1: Approximate minimum bulk density on setting
A Low sensitivity
Rosemount 2521S 9 lb/ft3 (150 g/l) 3 lb/ft3 (50 g/l)
Rosemount 2521H 4.5 lb/ft3 (75 g/l) 1.2 lb/ft3 (20 g/l)
Rosemount 2521H with enhanced sensitivity
1.2 lb/ft3 (20 g/l) 0.3 lb/ft3 (5 g/l)
B High sensitivity
Rosemount 2521S:
For measurement of solids in water, setting A is recommended. Sensitivity adjustments to the electronics can also be made using the potentiometer.
Option of interface measurement (sensitivity adjustable with the potentiometer)
Turn potentiometer to Min: Vibrating fork gets less sensitive.
Turn potentiometer to Max: Vibrating fork gets more sensitive.
Quick Start Guide 19
A
B C
D
Figure 4-3: Sensitivity Settings with Potentiometer
A. Potentiometer for adjusting the sensitivity B. Minimum sensitivity C. Maximum sensitivity
D. Sensitivity setting is not possible
20 Quick Start Guide
A
B
FSL FSH FSL FSH
3 4 53 4 5
345345
A

5 Operation

5.1 Signal output (switching logic)

Figure 5-1: Switching Logic (All Versions)
A. Fail Safe High or Low setting B. Signal output
Note
See Adjustment of the signal output for how to select a FSH or FSL setting.
5.2
Quick Start Guide 21

LED signal output

Figure 5-2: LED Visible On PCB
A. LED

6 Maintenance

6.1 Opening the lid (cover)

Before opening the lid for maintenance reasons, consider the following:
• Do not remove the lid while circuits are live.
• Ensure that no dust deposits or airborne dusts are present.
• Ensure that rain does not enter the housing.

6.2 Regular checks for safety

To ensure robust safety in hazardous locations and with electrical safety, the following items must be regularly checked depending on the application:
• Mechanical damage or corrosion of the field wiring cables or any other
components (housing side and sensor side).
• Tight sealing of the process connection, cable glands, and enclosure lid.
• Properly connected external PE cable (if present).

6.3 Cleaning

If cleaning is required by the application, following must be observed:
• Cleaning agent must comply with the materials of the unit (chemical
resistance). Mainly the shaft sealing, lid sealing, cable gland and the surface of the unit must be considered.
The cleaning process must be done in a way, that:
• The cleaning agent cannot enter into the unit through the shaft sealing,
lid sealing or cable gland.
• No mechanical damage of the shaft sealing, lid sealing, cable gland or
other parts can happen.
6.4
22 Quick Start Guide

Function test

A frequent function test may be required depending on the application.
Observe all relevant safety precautions related to work safety (e.g. electrical safety, process pressure, etc).
This test does not prove if the level switch is sensitive enough to measure the material of the application.
Function tests are done by covering the forks with a suitable solids material and monitoring if a correct change of the signal output from uncovered to covered happens.

6.5 Production date

The production year is shown on the nameplate.

6.6 Spare parts

Refer to the Rosemount 2521 Product Data Sheet for all spare parts.
Quick Start Guide 23

7 Product certifications

7.1 EU Declaration of Conformity

Figure 7-1: EU Declaration of Conformity (Page 1)
24 Quick Start Guide
Figure 7-2: EU Declaration of Conformity (Page 2)
Quick Start Guide 25
含含有有
China RoHS
管管控控物物质质超超过过最最大大浓浓度度限限值值的的部部件件型型号号列列表表
Rosemount 2521
List of Rosemount 2521 Parts with China RoHS Concent ration above MCVs
部部件件 名名称称
Part Name
有有害害 物物质质 / Hazardous Substances
铅铅
Lead
(Pb)
汞汞
Mercury
(Hg)
镉镉
Cadmium
(Cd)
六六价价 铬铬
Hexavalent Chromium
(Cr +6)
多多溴溴 联联苯苯
Polybrominated
biphenyls
(PBB)
多多溴溴 联联苯苯醚醚
Polybrominated diphenyl ethers
(PBDE)
电子组件
Electronics
Assembly
OOO
O
壳体组件
Housing Assembly
OOOOO
XXOOOOO
本表格系依据
SJ/T11364
的规定而制作.
This table is proposed in accordance with the provision of SJ/T11364.
O:
意为该部件的所有均质材料中该有害物质的含量均低于
GB/T 26572
所规定的限量要求.
O: Indicate that said hazardous substance in all of the homogeneous materials for this part is below the limit requirement of
GB/T 26572.
X:
意为在该部件所使用的所有均质材料里，至少有一类均质材料中该有害物质的含量高于
GB/T 26572
所规定的限量要求.
X: Indicate that said hazardous substance contained in at least one of the homogeneous materials used for this part is above
the limit requirement of GB/T 26572.
X
X X
Process Connection / Extension
过程连接/扩展部件

7.2 European Union directive information

The most recent revision of the EU Declaration of Conformity can be found at Emerson.com/Rosemount.

7.3 China RoHS

26 Quick Start Guide
Quick Start Guide 27
*00825-0100-2521*
00825-0100-2521, Rev. AA
Quick Start Guide
October 2019
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