Q6 How is the sensor’s durability defined?

Anritsu Meter conducts a “repetitive durability test” to evaluate the durability of the stationary surface sensors.
The repetitive durability test evaluates a temperature measurement count within the tolerance when repetitively brought into contact with a 300°C (limit temperature of the sensors if their service temperature limit is 300°C or less) smooth metal surface in a mechanical manner.
Durability evaluation of the moving/rotating surface sensors is more difficult because it greatly differs depending on the moving/rotating speed, temperature, surface condition (roughness) of a temperature measurement object, and so on.
Accordingly, the temperature of a 200°C smooth metal surface moving at 200 m/min. is measured and a measurement time within the tolerance is evaluated.
The internal/air temperature sensors are hardly exhausted if they are correctly used. Because they are designed delicately, there are more concerns about an accident caused by their breakage. For this reason, the relatively durable sensors with less deterioration are classified as B.


Stationary surface sensor

Moving/rotating surface sensor

Internal/air temperature sensor


50,000 times or more
(75,000 times or more for A series)

1,500 hours or more



10,000 times or more

1,000 hours or more

1year or more


Thousands of times or more

500 hours or more

Half a year or more


Thousands of times or more

500 hours or less

Half a year or less


Unevaluable sensors due to a special structure

* The durability of the sensors differs greatly depending on the working condition. It is described in the table above and detailed product descriptions.
The durability ranks A, B, C, D and S are a service life guide when the respective sensors are correctly used.