Endress+Hauser Introduces LiquiphantFailSafe FTL8x Point Level Switch

Its fail safe design and high reliability make the Liquiphant FTL8x level switch suitable for monitoring Minimum and Maximum liquid levels in safety applications up to SIL3.

Endress+Hauser introduces the LiquiphantFailSafe FTL8x series of point level switches. The level switches have two relay outputs, a 4-20mA output that connects to a failsafe switching unit with a two-channel output, safety contacts, and a safety locking function.

The 4-20mA output can be connected directly to a safety PLC or similar system for MIN and MAX safety applications up to SIL3. The 4-20mA 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 the “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.

The switches can be used for minimum and maximum level detection in liquids from -76 to 536F (-60 to 280C), at pressures up to 1450 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 AlloyC22 plating, and the other wetted parts are available with Alloy22 plating or ECTFE or PFA coatings for use in aggressive liquids. A choice of polyester, stainless steel or aluminium 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 withANSI/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 withinstallation practice in North America and enable very safe, low-cost installation in pressurized applicationswith 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.

For more information on the LiquiphantFailSafe FTL8x series of point level switchesgo to the product page at www.us.endress.com/liquiphant-failsafe

About Endress+Hauser
Endress+Hauser is one of the world's leading suppliers of measuring devices, services and solutions for industrial process engineering. In 2011, the company group recorded sales of approx. 1.9 billion dollars with more than 8,800 employees. Endress+Hauser supplies sensors, devices, systems and services for level, flow, pressure and temperature measure¬ment as well as liquid analysis and measured value recording. The company supports its customers with automa¬tion, logistical and IT services and solutions.