What is a cryogenic sensor?

Cryogenics refer to temperatures of -150°C (-238°F) and under and is used to store some gases in liquid form. When in liquid form, the volume is compressed drastically. For instance, liquid natural gas (LNG) is 600 times more compact in liquid form compared to its gaseous state, while liquid hydrogen is 851 times more compact in liquid form, which makes it possible to store or transport much larger quantities. But cryogenic storage and transportation can be a dangerous affair, and temperature control is vital to ensure safe operations.

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When dealing with liquified gas under cryogenic temperatures, sensors are an absolute must. Although sensors are a small part of the full gas storage installation, they are vital to ensure safe operations. Without them, the risk of slow reaction to undesirable temperature rise, and serious accidents as result, increases.

Inside the gas storage tank, sensors are used to monitor the temperature, while sensors placed in the tank’s insulation is used to detect leakage.

The interior temperature sensors are important to monitor stratification of the gases. Even in its liquid form, there will be a boil-off of lighter fractions, making the substance divide into layers with a risk of rollover. Rollover happens if the liquid surface density surpasses the density of the layers beneath, causing inversion of the tank substances. The sudden mixing of layers gives risk of volume expansion due to emission of heat and could potentially cause an explosion, linking temperature sensors directly to safety.

• Accurate measurements are vital to control temperature in stratified gases

• Our laboratory can test and calibrate 4-wire sensors at -195°C (-319°F) to +100°C (-212°F) for quality control

• All sensors and production processes meet relevant market standards.

• To uphold performance and endure the harsh cryogenic environment, the sensors are all specially designed.

• Multi-spot temperature sensor performance is secured by filling the sensor tube with a dry inactive gas. This is to prevent condensation of water inside the sensor, which would otherwise be a failure risk once the sensor exterior is put into contact with the low temperatures.