Sensortechnics' said its OLP series of miniature optical liquid level switches are designed to measure the presence or absence of liquid in applications such as medical equipment, HVAC, compressors, hydraulic reservoirs, and machine tools.

The switches can also be used for leak detection.

The switches are designed with no moving parts. Sensortechnics said the series range from basic devices with analog signals, switches with microprocessor compatible digital outputs, or high power transistor output versions capable of switching currents up to 500 mA.

The sensors are housed in plastic polysulphone casings. Sensortechnics said it can modify or customise the products to fit special manufacturing requirements.