Level Switches & Transmitters

A switch signals when the level reaches one point, such as high or low, and suits pump control or overfill alarms. A transmitter gives the level continuously, so you can see how much is in the vessel, trend usage and control filling smoothly. Many plants use a transmitter for monitoring and a switch as an independent high alarm.

An admittance level switch, which is designed to ignore build-up left on the probe by sticky material. The Trumen admittance switch handles both sticky and non-sticky solids and liquids, up to 600 °C with ceramic insulation, and won't false-trip the way a standard capacitance probe can.

Radar is unaffected by vapour, dust, temperature and pressure, so it suits dusty silos and process vessels. Ultrasonic is a cost-effective choice for water, open tanks and open channels where dust isn't a concern. Guided wave radar is the better choice again for tight vessels, obstacles or low-dielectric liquids.

Radar or guided wave radar, because the microwave signal isn't affected by the heavy dust inside a cement silo, unlike ultrasonic. For a simple high-level trip point instead of continuous monitoring, a pendulum or vibrating fork switch also works well in cement dust.

Yes. Several point level switches, and the pendulum and boot/membrane switches, are supplied in ATEX versions for combustible dust and gas zones. See our flameproof level switches and transmitters page, and confirm your zone with us before ordering.

Switches usually mount through the vessel wall or top at the level to be detected; transmitters mount at the bottom (hydrostatic types) or top (radar, ultrasonic, guided wave radar), looking down. Tell us the vessel type, material and mounting access and we'll confirm the right connection.