Process control: Valve positioner for safety systems

02/20/2007


Process control

SVI II ESD valve positioner from Masoneilan-Dresser, introduced last week in Control Engineering magazine, is SIL3-compliant and said to be a one wire solution for emergency isolation valves.

Oak Brook, IL and Avon, MA —SVI II ESD from Masoneilan-Dresser , an extension of the company's SVI II AP valve positioner, marks the company's entrance into the safety system arena. SIL3-compliant device is designed in accordance with IEC61508 and is suitable for use in safety instrumented functions. The product, introduced last week in the February issue of Control Engineering magazine , is used as an emergency isolation valve controller equipped with state-of-the-art diagnostics to improve the overall safety integrity of the safety instrumented loop.

The company calls the product a breakthrough because it allows for a one-wire solution for both the safety shutdown function of an isolation valve and partial stroke testing (PST) capability. Masoneilan adds that making maximum use of artificial intelligence at the device level through analysis of incoming data from multiple sensors gives the user usable, actionable information regardless of PST execution method.

SVI II ESD can be implemented using a 4-20 mA signal, 0-24-V dc, or both. One 4-20 mA solution is said to be best because it is SIL3 capable at 4 mA and allows the device to execute the safety function while active. Benefits are realized in capturing data during shutdown events, allowing continuous HART communications during a trip and facilitating local panel annunciation using the built-in discrete outputs.

The SVI II ESD allows flexible PST execution and automatically captures the PST in its non-volatile memory and stores the analysis. Annunciation of the results is realized using HART, the local LCD, or discrete signals. Two signatures can be stored; ValVue ESD Lookout software (standalone or integrated) automatically and regularly synchronizes the database with field data. The PST, says the company, is implemented so that it does not interfere with the safety function; the product's architecture is designed to segregate the two functions.

—Control Engineering Daily News Desk
Edited by Jeanine Katzel , senior editor





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Controller programming; Safety networks; Enclosure design; Power quality; Safety integrity levels; Increasing process efficiency
Additive manufacturing benefits; HMI and sensor tips; System integrator advice; Innovations from the industry
Robotic safety, collaboration, standards; DCS migration tips; IT/OT convergence; 2017 Control Engineering Salary and Career Survey
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This article collection contains several articles on how automation and controls are helping human-machine interface (HMI) hardware and software advance.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me