Find level sensors engineered for high process temperatures. Discover designs with cooling fins, standoffs, and special configurations for boiler, reactor & hot fluid applications.
Effectively measuring liquid levels in high-temperature environments, especially when dealing with challenging media like process oils, various grades of water (from purified to waste), or mildly corrosive solutions, demands specialised sensor designs. Our range of high-temperature liquid level sensors incorporates features such as integrated cooling elements (fins or standoffs) and carefully selected robust materials to thermally isolate sensitive electronics from extreme process heat. We offer solutions engineered for reliable performance, whether isolating the electronics via the process connection or requiring full sensor submersion in hot fluids found in industrial processes, hygienic applications, geothermal sources, or potentially hazardous locations.
3m range 4-20mA output submersible hot water tank level sensor - This submersible level sensor is suitable for use in hot water tanks. It features a 4-20mA output, 0-3m measurement range, and high-temperature resistance up to 125°C (257°F).
6m range 4-20mA submersible animal feed tank level and PT100 sensor - A hi-temp media 125°C/257°F max, RTD temperature measurement submersible liquid level sensor for submerging in an animal feed tank and measuring the depth over a range of 0 to 6m from the flush diaphragm, and sending the corresponding 4-20mA signal through the submersible cable electrical connection.
LMK458 Marine Approved Hydrostatic Level Transmitter
DMP331P Hygienic Flush Pressure Transmitter- LMK382 Low Range IP68 Waste Water Level Transmitter
LMK457 Marine Approved Level Transmitter
- High temperature mini sewage tank level sensor - Submersible level sensor for low-range sewage applications in small, high-temperature wastewater tanks.
- Dairy wash water tank submersible level sensor for temperature up to 100C and 2m high tank - Monitor wash water levels in high-temperature dairy applications with the LMK382 submersible level sensor, featuring 125°C temperature rating and durable construction.
Find out more about High Temperature Liquid Level Sensors to determine which product options and capabilities will best meet your application requirements.
Measuring liquid levels accurately and reliably becomes significantly more challenging when dealing with high process media temperatures. Standard level sensors often fail rapidly as their electronic components cannot withstand the conducted or ambient heat. Specialised high-temperature liquid level sensors are engineered specifically to overcome these thermal challenges, ensuring continuous operation and protecting sensitive electronics from damage.
A key design feature for many high-temperature level sensors is the incorporation of a cooling element or thermal barrier. This component, often appearing as cooling fins or an extended neck (standoff), is positioned between the hot process connection (wetted parts) and the sensor’s transmitter housing or electronic circuitry. The increased surface area of fins enhances convective cooling to the surrounding atmosphere, while a standoff increases the distance, creating a thermal gradient that significantly lowers the temperature reaching the sensitive electronics, keeping them within their safe operating limits.
Effective thermal isolation relies not only on cooling structures but also on careful material selection and construction. Wetted parts, those directly contacting the hot medium, must be fabricated from materials capable of enduring extreme temperatures and potential corrosivity without degradation. Common choices include specific grades of stainless steel (like 316L), alloys such as Hastelloy C, or ceramics, ensuring mechanical integrity and longevity at the required process temperatures.
For applications demanding complete submersion of the sensor into the hot liquid, the entire sensor assembly, including the connecting cable, must be designed for high-temperature endurance. This requires robust sealing techniques capable of maintaining integrity despite thermal expansion and contraction cycles. Cable materials are critical, often utilising high-temperature polymers like TPE.
Practical applications for these robust sensors are found across diverse industrial and research sectors, handling a variety of challenging fluids and operational conditions. They are essential components in power generation and industrial utilities for monitoring levels in boiler systems and hot water storage. Process industries frequently rely on them for gauging levels in tanks containing hot oils, such as those used in heat transfer systems or food production, often requiring hygienic designs. Chemical processing plants utilize these sensors for level measurement in reactors and vessels holding various heated process fluids. Furthermore, they are well-suited for demanding water and wastewater applications, managing levels in heated tanks containing anything from treated feed water and de-ionised water baths to corrosive solutions or industrial effluents. Submersible variants find use in specialized areas like geothermal monitoring and within high-temperature cleaning or sterilization cycles common in food, beverage, and pharmaceutical manufacturing, including suitability for potentially hazardous (ATEX) environments where required.