2025-04-10 HVAC/R, Products
Level sensors – also known as level switches or probes – are essential components in many industrial systems. They ensure reliable monitoring of fluid levels in tanks, pipelines, or vessels. Whether in refrigeration units, heat pumps, chemical processing, or energy systems, precise liquid level detection is critical for both efficiency and safety.
This article provides an overview of different types of level sensors, how they work, and where each type is best suited.
A level sensor is a measuring device that detects the level of a liquid or medium within a system. Depending on its technology, it can measure with or without direct contact. The data collected is typically used for control, automation, or to trigger safety alarms in case of critically low or high fluid levels.
Choosing the right sensor depends heavily on the environment, medium, temperature, and level of system integration. We classify level sensors into three main categories:
These sensors consist of a compact measuring element connected directly to the system via cable or sensor rod. They are often used in standard applications with consistent conditions.
Easy to install directly into tanks or pipe systems
Cost-effective solution with minimal components
Low maintenance and durable
Ideal for compact installations with straightforward monitoring needs
Oil level monitoring in compressors
General refrigeration and HVAC systems
Tank and container level control
Conclusion:
These sensors are suitable for conventional environments where reliability and simplicity are the top priorities.
Modular systems like those from KRIWAN are designed for high serviceability. These sensors consist of a screw-in base that remains installed in the system and a replaceable electronic head.
No need to empty the system when replacing the electronics
Lower maintenance costs and shorter downtimes
Tool-free electronic unit exchange
Ideal for harsh media or environments with frequent service intervals
Refrigeration systems using natural refrigerants (e.g. CO₂, NH₃)
Heat pumps and HVAC systems
Oil separators and compressors
Processes with demanding maintenance schedules
Conclusion:
This design allows for maximum uptime and flexibility without sacrificing performance or safety.
Certain applications require sensors that can withstand ice formation, extreme heat, or explosive atmospheres. For these conditions, dedicated models are available.
Designed specifically for CO₂ refrigerant collectors, where ice can form due to ambient moisture. This model resists freezing and continues to measure accurately even in heavily iced conditions.
Ideal for high-temperature environments up to +160 °C. These sensors are perfect for industrial heat pumps and refrigeration systems using high-temp refrigerants. They resist vibration, thermal stress, and mechanical loads.
Certified for use in potentially explosive areas (ATEX/IECEx compliant). They feature sealed, pressure-resistant housings, self-monitoring capabilities, and high chemical resistance. Typical use cases include chemical plants, oil and gas industries.
Selecting the right level sensor is essential for safe and efficient system operation. While standard solutions are suitable for simple applications, modular and specialized sensors offer unmatched reliability in demanding environments.
Modular systems in particular offer a strong advantage: they minimize downtime and service costs, making them a worthwhile investment for operators of complex or mission-critical installations.
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