Level Sensors

The PLS 960 Series Ultrasonic Point Level System is engineered for precise detection of ultra-pure liquid chemical levels in bubblers and ampoules used in the semiconductor industry, specifically in PVD, CVD, and ALD processes. Designed to fit ½” or ¾” VCR fill ports, this system features probes with no moving parts, eliminating contamination risks. The sensor’s performance is unaffected by chemical colour, dielectric constant, density, or viscosity. Customisable with multiple sensing points, the probe is made from 316L stainless steel with an electro-polished finish and undergoes leak testing for reliability. Electronics are remotely mounted to accommodate high-temperature environments, requiring no calibration or adjustment between sensors.

The PLS-262 Series Ultrasonic Point Level System is designed for reliable dual-point liquid level control in storage vessels and tanks. Featuring integrated electronics, this system is suitable for a wide range of liquid level applications. The probe is made from durable 316L stainless steel, while the electronic module is housed in a plastic cassette enclosed within a NEMA 4/7 explosion-proof housing. No calibration is required, simplifying installation and maintenance. An LED indicator provides visual system status, and a field-selectable fail-safe relay supports auto fill or empty control. The system includes a demand push-button self-test for operational assurance and incorporates a 0.5 second delay from wet to dry signals to prevent false alarms caused by wave action.

The PLS 161 Series Ultrasonic Point Level System is designed for low-level liquid detection in storage vessels, tanks, and pipes. Featuring integrated electronics, it supports both AC and DC inputs with options for a 10A SPDT relay or loop-powered 4-20mA output, making it suitable for nearly any liquid level monitoring application. The probe is constructed from 316L stainless steel, and the electronic module is housed in a plastic cassette within a NEMA 4/7 explosion-proof enclosure. No calibration is required, simplifying installation and maintenance. An LED indicator provides visual system status, while field-selectable fail-safe relays offer flexible operation. Continuous self-diagnostics check probe connections, and a demand push-button self-test confirms system functionality. A 0.5 second delay from wet to dry prevents false trips caused by wave action.

The PLS 163 Series Ultrasonic Point Level System is designed for accurate detection of sludge levels in clarifiers and tanks. It automates pump or valve operation to maintain sludge at the desired level, enhancing plant efficiency and effluent quality. By enabling automatic sludge withdrawal for controlled time periods, the system ensures sludge of the right density is delivered to digesters or thickeners, while preventing solids carryover into the effluent system. The PLS 163 system’s ultrasonic technology eliminates moving parts, ensuring reliable operation unaffected by colour, viscosity, dielectric constant, or density variations.

The PLS 166 Series Ultrasonic Point Level System is designed for liquid level detection in storage vessels, tanks, and pipes where power supply is limited or unavailable. Powered by solar energy, this system offers a reliable solution for remote or off-grid applications. The probe is constructed from durable 316L stainless steel. The electronic module, solar power system, and accessories are housed in a powder-coated die-cast aluminium enclosure for robust protection. No calibration is required. A LED strobe indicator provides clear visual status, complemented by an audio alarm and reset switch. Battery status monitoring and a demand push-button self-test ensure proper operation. A 0.5 second delay from wet to dry prevents false alarms caused by wave action. The PLS 166 combines solar power with ultrasonic technology ensuring no moving parts and consistent performance regardless of liquid properties.

The PLS-168 Series Ultrasonic Point Level System is designed for non-invasive detection of liquid presence or absence within tubes using ultrasonic technology. It transmits and receives sound waves without penetrating the tube, ensuring contamination-free operation. The sensor can be fitted with process connections for easy installation and eliminates the need for customer adjustments. Miniaturised electronics are integrated into the sensor. Custom-built to fit tubes ranging from 6.3 mm to 19 mm in diameter, it detects bubbles or air-in-line accurately. Sensors for larger tube sizes are available upon consultation. Each sensor is tailored to specific tube size, flow rate, and user input/output requirements, requiring no calibration. The PLS 168 utilises ultrasonic technology with no moving parts, providing reliable detection unaffected by liquid colour, viscosity, dielectric constant, or density.