Level switch suitable for monitoring liquid levels in safety applications up to SIL3

E+H introduces Liquiphant FailSafe FTL8x point level switch and two-channel switching unit.

12/19/2012


E+H introduces Liquiphant FailSafe FTL8x point level switch and two-channel switching unit.Endress+Hauser has introduced its Liquiphant FailSafe FTL8x series of point level switches. The level switches have two relay outputs, a 4-20 mA output that connects to a failsafe switching unit with a two-channel output, safety contacts, and a safety locking function.

The 4-20 mA output can be connected directly to a safety PLC or similar system for min and max safety applications up to SIL3. The 4-20 mA signal jumps from high to low current when the min or max point level is reached for reliable detection by the safety system. In addition, a permanent live signal of 0.25 Hz is superimposed on the sensor output to indicate the sensor is operating in a good state. The level switch meets SIL3 requirements in accordance with IEC 61508, IEC 61511-1, ISA 84-1 and DIN EN ISO 13849.

For high reliability, built-in diagnostics monitor the tuning fork-type sensor for damage, corrosion, material buildup, and mechanical blocking. If a problem occurs, the live signal changes to notify the operator, a fault relay sends a signal to an annunciator or PLC, and a combination of three LEDs on the housing indicate the problem so that the switch can be cleaned, repaired, or replaced prior to failure.

These switches can be used for point level detection in liquids from -76 to 536 °F (-60 to 280 °C), at pressures up to 1,450 psi (100 bar), viscosity up to 10,000 mPa-s, and densities from 0.4 to 2.0 g/cm3. The FTL8x can also be used in highly corrosive media. Tuning fork sensors are available in 316L or 318L stainless steel with Alloy C22 plating, and the other wetted parts are available with Alloy C22 plating, or ECTFE or PFA coatings for use in aggressive liquids. A choice of polyester, stainless steel, or aluminum housings for the electronics are available, with or without a sight glass.

For North America, these switches are designed as either single seal or dual seal devices with an alarm in accordance with ANSI/ISA 12.27.01. This means that the user does need to install an external secondary process seal which is required in ANSI/NFPA 70 (NEC) and CSA 22.1 (CEC). These devices comply with installation practice in North America and enable very safe, low-cost installation in pressurized applications with hazardous media.

The FTL8x switches meet ATEX, CSA, FM, UL, IEC ex, NEPSI, and TIIS requirements for use in non-hazardous areas. Special models are available for use in hazardous areas or applications with high pressures.

Endress+Hauser

www.us.endress.com

Edited by Peter Welander, pwelander@cfemedia.com



No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
World-class manufacturing: A recipe for success: Finding the right mix for a salad dressing line; 2015 Salary Survey: Manufacturing slump dims enthusiasm
2015 Top Plant: Phoenix Contact, Middletown, Pa.; 2015 Best Practices: Automation, Electrical Safety, Electrical Systems, Pneumatics, Material Handling, Mechanical Systems
A cool solution: Collaboration, chemistry leads to foundry coat product development; See the 2015 Product of the Year Finalists
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
Special report: U.S. natural gas; LNG transport technologies evolve to meet market demand; Understanding new methane regulations; Predictive maintenance for gas pipeline compressors
Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
Getting ready for industrial IoT; Visualizing the (applied) automation continuum; Preventing VFD faults and failures; Using wireless for closed-loop applications
Migrating industrial networks; Tracking HMI advances; Making the right automation changes
Understanding transfer switch operation; Coordinating protective devices; Analyzing NEC 2014 changes; Cooling data centers

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.