High availability solenoid system

Houston, Tex.— Expanding on the popular 2oo2 (two out of two) voting design, ASCO (Florham Park, N.J.) and SIS-Tech Solutions (Houston, Tex.) have co-developed the 2oo2D-SOV, an integrated solenoid solution for safety protection systems requiring a high level of availability and reliability. Suitable for use in areas with Class I, Division II, Groups A, B, C, and D classification, 2oo2...

08/01/2000


Houston, Tex.— Expanding on the popular 2oo2 (two out of two) voting design, ASCO (Florham Park, N.J.) and SIS-Tech Solutions (Houston, Tex.) have co-developed the 2oo2D-SOV , an integrated solenoid solution for safety protection systems requiring a high level of availability and reliability.

Suitable for use in areas with Class I, Division II, Groups A, B, C, and D classification, 2oo2D-SOV (patent pending) combines a keyed bypass switch, two pressure switches, and two solenoids to form a system that provides on-line diagnostics of solenoid status and facilitates on-line testing. When activated, a keyed switch bypasses the pressure switch/solenoid pneumatic circuit and maintains air pressure on the valve actuator, permitting online tests to be conducted without compromising protection integrity or concern for nuisance trips. The pneumatic circuit ensures system integrity by using the pressure switches to verify one solenoid is energized before de-energizing the other. During normal operation, the pneumatic signal passes through 2oo2D-SOV from the signal source to the control or block valve actuator. When a trip occurs, air is vented from the process valve actuator, allowing the actuator's spring to move the process valve to its fail-safe position.

Connecting the 2oo2D-SOV to a controller requires two digital outputs, one for each solenoid; and three digital inputs, one for each pressure switch and one to indicate bypass switch position. Applications requiring high availability and reliability and/or those protected by safety instrumented systems can improve their overall protection integrity by including 2oo2D-SOV as part of the protection system design. www.asco.com or www.sis-tech.com ASCO SIS-Tech





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
Each year, a panel of Control Engineering editors and industry expert judges select the System Integrator of the Year Award winners.
Control Engineering Leaders Under 40 identifies and gives recognition to young engineers who...
Learn more about methods used to ensure that the integration between the safety system and the process control...
Adding industrial toughness and reliability to Ethernet eGuide
Technological advances like multiple-in-multiple-out (MIMO) transmitting and receiving
Big plans for small nuclear reactors: Simpler, safer control designs; Smarter manufacturing; Industrial cloud; Mobile HMI; Controls convergence
Virtualization advice: 4 ways splitting servers can help manufacturing; Efficient motion controls; Fill the brain drain; Learn from the HART Plant of the Year
Two sides to process safety: Combining human and technical factors in your program; Preparing HMI graphics for migrations; Mechatronics and safety; Engineers' Choice Awards
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control, and embedded systems.
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
News and comments from Control Engineering process industries editor, Peter Welander.
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
This is a blog from the trenches – written by engineers who are implementing and upgrading control systems every day across every industry.
Anthony Baker is a fictitious aggregation of experts from Callisto Integration, providing manufacturing consulting and systems integration.
Integrator Guide

Integrator Guide

Search the online Automation Integrator Guide
 

Create New Listing

Visit the System Integrators page to view past winners of Control Engineering's System Integrator of the Year Award and learn how to enter the competition. You will also find more information on system integrators and Control System Integrators Association.

Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.