What is Immersion Stem Effect

There are many ways that temperature measurements can impact applications negatively. This includes immersion depth, temperature range, the geometry of the sensor, and fit within a device. The above four factors are all branched under the immersion stem effect (ISE). This impact is only felt on thermistors that are used in liquid or gas environments (especially when immersing probes within the gas or liquid). When a device is immersed in a liquid or gas, a new thermal conductive path is created. This is the results of the stem of the probe. ISE allows heat to be conducted away from the sensor tips (via a probe stem in the outer atmosphere). When ISE is active, the tip of the sensor will begin to measure different temperatures than that of the surrounding gas or liquid.

Another concern to worry about is the depth of the immersion. If a thermistor is not placed at the right depth (too deep or not too deep), there is a high likelihood of inaccurate measurements.

Considering that immersion stem effect is natural, it is essential to understand how to combat the problem. Our talented team can help you determine:

  1. Best practices for immersion depth
  2. Temperature range solutions
  3. Custom fits to reduce air-gaps
  4. The understanding geometry of the sensor

Give us a call today for more information about thermistors.

Thermistors