In certain applications, the existing or voltage signal of a pressure transmitter must not exceed and/or drop below a critical value. This is often ensured with the aid of so-called signal limiting.
Why is a sign clamping necessary to begin with?
If the pressure on a pressure transmitter lies within the nominal pressure range, then you will see a defined signal output (e.g. 4 ? 20 mA or 0 ? 10 V). However, in technical applications, it frequently happens an originally planned pressure range is exceeded or is dropped below. This can happen deliberately, for example when cleaning, as well as accidentally, for instance through load variations or in case of a fault. In Intriguing , the sensor signal may also move beyond your defined limits, so that, for example, an ongoing signal in the number of 3.6 to 25 mA can occur.
If now, however, Under Priced are set so they recognise a signal outside the defined limits being an error, in a few situations, trouble-free operation of the complete system can’t be ensured anymore. In such cases, a signal limiting of the pressure transmitter is practical, in order that the output signal is maintained within the required range (e.g. 3.8 ? 21 mA).
Note
An example of a pressure transmitter with that your voltage signal and also the current signal can be limited is the model S-20 (for general industrial applications) or the model MH-3 (for mobile working machines) from WIKA.