Liquid level switch - safe and easy

October 2006 Level Measurement & Control

The new Echotel 961/962 liquid level switch makes use of unique self-diagnostics to detect malfunctions of the electronics and transducer, and also alarm the user in case of excessive electro-magnetic noise interference. This feature keeps tabs on the performance of the switch and safeguards the performance of other field instrumentation in the area. SIL philosophy is fully integrated into the design, resulting in a reliable and safe to use switch. With an SFF of >90%, the 961/962 scores as one of the safest switches in the world. It can be easily integrated in SIL instrumented loops of SIL 1, 2 and 3 level depending on the users' safety system and historical experience with the technology.

Other features include adjustable time delay, 'on-demand' test buttons for the output (alarm, error, wiring, linked actuators), LED indication for alarm status, reliability condition and in case of malfunction, identification of the malfunction and separate error signal. The 961 provides a single setpoint where the 962 offers two selectable setpoints on the same sensor. The 962 can be set for high/low level alarm detection or pump control. In pump control mode, the unit will latch its relays internally so that no peripheral equipment is needed to perform automatic fill and drain functions.

The 961/962 is available with relay or mA output options, various transducer materials including plastics, aluminium or stainless steel housing, threaded and flanged process connection. The 961/962 is designed for use in ATEX intrinsically and explosion proof areas as well as CIP/SIP clean environments. The construction of the device conforms to PED (pressure equipment directive) regulations.

The devices are not sensitive to changing density or other liquid variables and therefore do not require any calibration. They can be used on almost all liquids with a max. viscosity of 10,000 cP, resisting temperatures up to +165°C and pressures from full vacuum service up to 13,8 MPa.

For more information contact John Ferreira, NIC Instruments and Engineering, 011 386 5000, [email protected], www.magnetrol.com

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