The new Echotel 961 liquid level switch extends its sensor offering with a new stainless steel sensor that handles process temperatures down to -80C. It is made of standard 316/316L material with special potting material to handle the low temperature. The standard 961 series offer a broad range of sensors including 316/316L, Hastelloy C,Monel, CPVC, Kynar and 316/316L with 0.5 5 mm sanitary finish.
Echotel 961 switches utilize state-of-the-art pulsed ultrasound technology to detect the presence or absence of liquid. The system operates on a two crystal pulsed or “transmit-receive” principle which applies a 2MHz high frequency electronic burst to the receiving crystal. The speed of propagation determines the absence or presence of liquid.
By applying pulsed wave technology, the unit is less sensitive to buildup, aeration, foam, and turbulence than most of its competitors. The 961 typically has a response time of < 0,5s and is among the safest overfill preventions of its kind. With a SFF of > 90%, it can easily be integrated in SIL 1,2 and 3 loops, depending on the users safety system
experience.
A dual-point unit also exists with two selectable switch points on the same sensor (Echotel 962) for High and High/High Level alarm, Low and Low/Low level alarm or pump control.
The unique features include adjustable time delay, “on-demand” test buttons for the output signal (alarm and error), LED indication for alarm status, reliability condition identification of a malfunction and separate error signal.
Designed for use in ATEX intrinsically and explosion proof areas as well as CIP/SIP clean environments, it also conforms to PED (Pressure Equipment Directive) regulations.
The 961/962 is not sensitive by changing density or other liquid variables and therefore does not require any calibration. The units can be used on almost every liquid with a max. viscosity of 10.000 cP, resisting temperatures from -80C up to +165C and pressures from full vacuum service up to 138 bar. The 961/962 is also available with relay or current shift output.
