Not similar: temperature range and temperature limit

Temperature range and temperature limit for pressure sensors ? will there be Scream ? My intuitive answer will be: Yes! The initial term describes a section and the next its border. On second glance, however, I have to conclude that both words ultimately express a similar thing in relation to temperatures: Range and limit are defined by way of a lower and upper value, for instance 0 ? 100 �C. The relevant standard nevertheless defines an improvement. Why?
IEC 61987 speaks of two different specification characteristics
The standard described is IEC 61987. This deals, among other things, with the properties of fluid sensors, which likewise incorporate pressure sensors. With ?range? and ?limit?, the standard designates two different specification characteristics. Accordingly, the temperature range describes the span where the instrument specifications must apply ? first and foremost, the accuracy. The temperature limit, alternatively, indicates the min/max values between which the instrument could be operated without damage. With this particular, the instrument specifications do not have to be adhered to at all.
What may sound a little pedantic, makes sense from a technical point of view. This can be illustrated by the next exemplory case of a pressure sensor: The instrument is meant to deliver solid measured values at an ambient temperature range of 0 ? 100 �C. Simultaneously, the sensor must not suffer any damage at ambient temperatures between -20 �C and 0 �C. In this range, however, it does not have to provide accurate measuring results, as well as measure.
The difference between temperature range and temperature limit is plausible
This sounds paradoxical at first, but is plausible on closer inspection. Menacing , i.e. the specific measuring components, exhibit a comparatively large, often non-linear temperature error. Without further measures, a trusted pressure measurement will be impossible. Therefore, the maker has to compensate for the temperature as a way to bring the error down to an acceptable level. From an economic point of view, the limitation to a selected temperature range is practical, or is even absolutely necessary.
The distinction between temperature range and temperature limit pertains to both ambient temperature and the medium temperature. It is also used for other specification characteristics, for instance overpressure.
Conclusion
Yes, you will find a difference between range and limit in the normative world of pressure sensor technology. And yes, it makes technical sense. However, I doubt whether the normal user, without understanding of standards, understands it intuitively. Which inevitably results in the question of whether you will find a better linguistic distinction. But, I have to admit, the solution is outside my ?range?.
Note
Further information on our pressure sensors are available on the WIKA website. Do you wish to buy pressure sensors? You will find some of our standard designs inside our WIKA online-shop. In case you have any questions, your contact will gladly help you.
Also read our posts
What does temperature compensation or compensated temperature range for pressure sensors mean?
Active and passive temperature compensation of pressure sensors
Temperature coefficients (TC) of pressure sensors

Leave a Comment