Coffee machine probes should be of high quality and cost-effective, yet still have long-term stability during their long service life of 15 years and always reliably detect the temperature within the specification.
The used material must be food safe and comply with the drinking water ordinance. In addition, the probe must also be vibration-resistant and achieve a sufficiently fast response time to ensure efficient control of the coffee machine.
Another very important characteristic is the dielectric strength of the temperature sensor, i.e. its resistance to high electrical voltages. In addition to the fast response time, this is one of the reasons why a ceramic sleeve is considered instead of stainless steel.