February 2020

Rosemount 3051SAL Level Transmitter

22nd February 2020/in Level/by Mari-saba

Rosemount 3051SAL Level Transmitter

Make reliable pressure measurements in extreme conditions with the Rosemount 3051SAL Level Transmitter, a best-in-class solution that offers enhanced capabilities for pressurized and vented tank level measurements. This transmitter is safety certified and engineered with advanced diagnostics for increased insight. Designed to allow direct mounting, remote mounting, balanced systems and Tuned-System™ assemblies, this device can meet a variety of demands and process requirements for level applications.

Features of Rosemount 3051S DP Level Technology

1- ERS System

Electronic Remote Sensor (ERS™) Systems provide DP Level measurements by calculating differential pressure from individual pressure readings. This solution eliminates the need for long capillaries and heat tracing, reducing response time by up to 90%. The sensor system is synchronized for DP calculation, easily connects with cable, and can be independently installed and serviced for simple installation and maintenance.

2- Thermal Range Expander

Thermal Range Expander enables pressure and level measurements in high-temperature processes. This seal system uses two different fill fluids, extending the operating range of the transmitter from temperatures ranging from -75 °C (-103 °F) to 410 °C (770 °F). With an improved response time of up to 46%, thermal range expanders simplify installation and reduce cost by eliminating impulse piping and heat tracing.

3- Wireless Technology

With Wireless Technology, you can add new measurement points easily and cost-effectively in many areas of the plant including those that were previously inaccessible. This information allows you to better optimize your level measurements and reduce personnel exposure to hazardous environments. Get coverage over larger areas with long-range communication options up to 1 km (2/3 mi) between devices.

4- Diaphragm Seal System

The Diaphragm Seal System protects transmitters from hot, cold, corrosive, erosive or viscous processes. Seals are available with differential, gauge and absolute pressure transmitters. Advanced welding and assembly techniques prevent weld corrosion and improve seal strength to deliver reliability and performance in the toughest applications.

5- Expanded Capabilities

The Rosemount 3051S enhanced features offer a scaled process variable, enabling this device to convert pressure units to customized, user-defined units. Process pressure or temperature alerts can also be configured as well as alerts of abnormal process conditions. In addition, the 3051S features remote mount LCD display capabilities, allowing direct mounting of the device while keeping the local display in a convenient location.

6- Seal System Construction

1- Universal Connection

Welded capillary/instrument connection eliminates leaks and improves reliability

2- Advanced Weld Techniques

Engineered to prevent weld corrosion
Improves seal reliability

3- Backup Diaphragm Pattern

Matches pattern of diaphragm
Helps diaphragm maintain original form
Reduces oil volume for improved performance

4- Recessed Diaphragm

Protects diaphragm from installation damage
Minimize gasket induced errors
Protects diaphragm from installation damage
Prevents zero offset pressure on the diaphragm from the off-centered gasket

Specifications

Max. Operating Pressure

Up to 10,000psi (689.48 bar)

Process Temperature Range

Based on fill fluid – Maximum 770°F (410°C), Minimum -157°F (-105°C)

Communication Protocol

4-20 mA HART®
WirelessHART®
FOUNDATION™ Fieldbus

Seal System Type

Direct Mount
Remote Mount
Tuned-System
Balanced System

Transmitter Connection

Welded-Repairable
All Welded

Process Connection

Flanged: ANSI/ASME, EN/DIN, GOST, & JIS
Threaded: NPT, DIN, ISO
Hygienic

Process Wetted Material

316L SST
Alloy C-276
Alloy 400
Tantalum
Gold-plated Alloy 400
Gold-plated 316L SST

Diagnostics

Basic Diagnostics
Loop Integrity
Process Intelligence
Plugged Impulse Line

Certifications/Approvals

SIL 2/3 certified to IEC 61508 by an independent 3rd party
NACE®
3A
hazardous location

Fisher 3661 Electro-Pneumatic Positioner

13th February 2020/in Valve/by Mari-saba

Fisher 3661 Electro-Pneumatic Positioner

Fisher Electro-Pneumatic Positioner is used with various actuators on sliding-stem valves for throttling applications. These rugged positioners provide a valve position proportional to a pneumatic input or a standard milliampere DC input signal received from a control device.

What is a Valve Positioner?

As a common control valve accessory, the valve positioner delivers pressurized air to the valve actuator so that the position of the valve stem or shaft corresponds to the setpoint from the control system. Valve positioners are typically pneumatic or analog I/P and are used when a valve requires throttling action. They require position feedback from the valve stem or shaft and deliver pneumatic pressure to the actuator to open and close the valve

Pneumatic Valve Positioners

Legacy processing units may use pneumatic pressure signaling as the control setpoint to the control valves. In a common pneumatic positioner design, a pneumatic input signal is received from a control device and modulates the supply pressure to the control valve actuator, providing an accurate valve stem or shaft position that is proportional to the pneumatic input signal.

Analog I/P Valve Positioners

Most modern processing units use a 4 to 20 mA DC signal to modulate control valves. This introduces electronics into the positioner design and requires that the positioner convert the electronic current signal into a pneumatic pressure signal (current-to-pneumatic or I/P). In a typical analog I/P positioner, the converter receives a DC input signal and provides a proportional pneumatic output signal through a nozzle/flapper arrangement. The pneumatic output signal provides the input signal to the pneumatic positioner.

Features

Positioner design provides accurate, fast-responding instruments able to withstand the vibrations of most plant environments. Low steady-state air consumption contributes to efficient operation.
Easily adjustable gain and damping adjustments fine-tune the positioner stability to specific application requirements.
The positioner accepts a standard milliampere DC input signal from a control device. This positioner provides split range capabilities and adjustable zero and spans.
Most of the parts for 3661 positioners are interchangeable; requiring fewer spare parts to support these positioners.
The case and cover are designed to withstand mechanical vibration and rough handling.
Zero and span adjustments can be made with the cover in place.
To support diagnostic testing of valve/actuator/positioner packages with the FlowScanner™ valve diagnostic system, connectors, piping, and other hardware can be installed between the 3661 positioner and the actuator.

Fisher Electro-Pneumatic Positioner Specifications

Area Classification

Intrinsically Safe
Non-incendive
Dust

Certifications

CSA
FM
ATEX
IECEx
CUTR
Peso
KGS
INMETRO
RCM

Communication Protocol

4-20mA Analog

Diagnostics

No

Input Signal

Electric

Max Outlet Pressure

90 psi

Mounting Type

Actuator Mounted

Operating Temperature

Standard Temperature

Position Control

Modulating

Safety Certification

NIL

Supply Media

Air

Other Configurations

Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.

Fisher Flanged Control Valve

6th February 2020/in Valve/by Mari-saba

Fisher Vee-Ball™ V300 Flanged Control Valve

The Fisher Vee-Ball V300 Flanged control valve is your best choice for performance and cost-effectiveness across a broad range of applications. The precision-machined parts and pressure-balanced seal designs allow smooth, precise valve operation.

What is a Segmented Ball Valve?

A segmented ball valve is similar to a conventional ball valve, but with a contoured V-notch segment in the ball. This control valve has good rangeability, control, and shutoff capability. The V-notch ball provides positive shearing action and produces an inherent equal percentage flow characteristic. It provides non-clogging, high capacity flow control. The V-notch ball has been specially contoured to maximize capacity and enhance seal life and shutoff integrity.

Common Applications

V-notch ball control valve bodies are suited to control erosive or viscous fluids, paper stock, or other slurries containing entrained solids or fibers. The paper industry, chemical plants, sewage treatment plants, the power industry, and petroleum refineries use such valve designs.