How it Works
Rosemount
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2521
Specifications
20 pgs1.06 Mb0
Operating Manual
28 pgs2.18 Mb0
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Rosemount 2521 Operating Manual

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
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