How it Works
Rosemount
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2501
Specifications
32 pgs1.11 Mb0
Operating Manual
36 pgs2.41 Mb0
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Rosemount 2501 Operating Manual

Quick Start Guide
00825-0100-2501, Rev AA
October 2019
Rosemount™ 2501 Solids Level Switch
Rotating Paddle
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™ 2501 Solids Level Switch is used for monitoring the level of bulk materials in all types of containers and silos.
The level switch can be equipped for process overpressure pressure, and also for very high or low process temperatures.
The level switch can be used with different paddle shapes and sizes to monitor fine and medium solids in bulk materials. See Table 4-1 for a guide to the minimum density requirements.
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,
(1)
and low
(1)
Overpressure (or blast overpressure) is the pressure caused by a shock wave over and above normal atmospheric pressure.
Quick Start Guide 5
A B C
D
E
F
G
Quick Start Guide October 2019
if it has an extended length, mount it vertically on top of a silo to monitor the maximum filling limit.
The length of the paddle can be up to 158 in. (4 m) with an extension tube or up to 394 in. (10 m) with an extension rope.
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 2501R or 2501S with the rope-extended fork length B. Rosemount 2501M with the tube extension and optional sliding sleeve C. Rosemount 2501L with the pendulum shaft
D. Rosemount 2501L with the boot-shaped vane paddle
E. Rosemount 2501J F. Rosemount 2501K
G. Optional sliding sleeve
6 Quick Start Guide
B
A C D

1.3 Measurement principles

Using a synchronous motor, the paddle (measuring vane) is driven to rotate 360 degrees.
When the vane of the paddle is not covered by a solids medium, a spring pulls the motor and it switches a lug to the left position (Figure 1-2, top illustration). The signal output indicates an 'uncovered' state and the motor rotates the paddle.
When a solids medium covers the vane of the paddle, and causes the rotation to stop, the lug is switched to the right position (Figure 1-2, bottom illustration). The signal output indicates a 'covered' state due to a rising level of material, and the motor is stopped until the vane becomes uncovered.
Figure 1-2: Switching Lug Function
A. Switching lug in left position ('uncovered' state) B. Switching lug in right position ('covered' state) C. Switch for stopping the motor
D. Switch for signal output
Quick Start Guide 7
The electrical outputs vary depending on the power supply selected when the Rosemount 2501 was ordered. See the Rosemount 2501 Product Data
Sheet for the Power Supply option codes, and Electronics for an overview of
the outputs.

1.4 Functions

1.4.1 Selection guide

Table 1-1: Rosemount 2501 Selection Guide
Type of installation
Full silo detection * *
On-demand detection
Empty silo detection
Vertical mounting
Angled mounting (top)
Horizontal mounting
Angled mounting (bottom)
(1) Consider the maximum permitted mechanical traction force. (2) Available only with the "bearing at tube end" option.
2501L 2501M 2501R 2501S 2501K 2501J
(1)
* *
* *
* * * *
* *
* * *
* *
Model option codes
* * * *
(1)
(1)
(1)
(2)
* *
* *
*
*
8 Quick Start Guide

1.4.2 Shaft sealing and metal material

Table 1-2: Shaft Sealing and Metal Material
Application Sealing material
NBR FPM PTFE ALU
Animal feed press * * *
Synthetic granules,
* *
powders
Salt * * *
Dust filter (for up to 392 °F)
Dust filter
* *
(for up to 302 °F)
Bitumen * *
Cement * *
Wood chip dryer * *
Pressure conveying vessel, 8 bar
Sugar * *
Flour * *
Carbon black * *
(1)
Metal Bearing
* *
* *
(2)
SST 304 (1.4301)
(3)
SST
(1) Selection varies, depending on process temperature and pressure:
NBR: Maximums are 80 °C and 0.8 bar.
FPM: Maximums are 150 °C and 0.8 bar.
PTFE: Maximums are 250 °C and 0.8 bar, 80/150/250 °C and 5/10 bar.
(2) Aluminum. (3) 316L (1.4404) stainless steel is recommended in particular cases.
Quick Start Guide 9

1.4.3 Electronics

Table 1-3: Electronics
Power supply SPDT
Ac version
Dc version
Universal voltage
(1) Single-Pole-Double-Throw contacts. (2) Double-Pole-Double-Throw contacts. (3) Selectable Fail Safe High or Fail Safe Low alarm output. See Wiring the universal
(4) Adjustable time delay for the switched outputs.
24 or 48 Vac or 115 or 230 Vac
24 Vdc * - - - -
24 Vdc / 22 .. 230 Vac
voltage version and Jumper Settings for Fail Safe High or Low.
(1)
* - - - -
- * * * option
DPDT
(2)
FSH/ FSL
Output
(3)
delay
(4)
Fail safe alarm
Switched signal output
The ac-voltage or dc-voltage versions of the level switch output a 'covered paddle' or 'uncovered paddle' status signal through SPDT relay contacts.
See Wiring the ac and dc voltage versions for details.
The universal-voltage version of the level switch outputs a 'covered paddle' or 'uncovered paddle' status signal through DPDT relay contacts.
See Wiring the universal voltage version for details.
When using the universal-voltage version of the level switch, there is an adjustable delay for the switched signal output. Setting a delay helps to prevent false switching of the output when there is movement of the bulk material in a silo (or other vessel). See Figure 4-1 for details.
Fail safe alarm
The fail-safe alarm option makes it possible for the level switch to indicate a fault using the alarm relay.
The following faults are indicated:
• Motor failure
• Gear failure
• Electronics failure (for motor power supply)
• Supply voltage failure
• Terminal wiring defect
10 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. Ensure the mechnical force exerted on the paddle by the bulk
solids does not exceed the maximum permitted for that paddle. Refer to the technical specifications in the Rosemount 2501 Product Data Sheet for further information.
b. 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.
c. 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 2501 Product Data Sheet has all the technical
specifications. See Emerson.com/Rosemount for other language versions.
Quick Start Guide 11
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