Switch uses sound to get to right level

Chem Resist Europe says it has now added an Ultrasonic version to its extensive range of Flowline level switches.

Ultrasonic level switches can be used with a broad range of liquids (including those with light coating or scaling characteristics).

The probe operates with two piezoelectric crystals separated by an air gap in the fork shaped tip. One crystal vibrates at a nominal frequency of 1.5 Mhz and transmits an acoustic signal into the centre of the gap. As the probe tip becomes immersed in liquid, the crystals acoustically couple and the switch changes state.

Ultrasonic switches come in intrinsically safe and general purpose versions, with a choice of two probe lengths and made in PP or PFA Teflon materials.

Chem Resist Europe is Flowline’s UK supplier.