In certain applications, the existing or voltage signal of a pressure transmitter should never exceed and/or drop below a crucial value. This is often ensured using so-called signal limiting.
Why is Introducing clamping necessary in the first place?
If No Obligation on a pressure transmitter lies within the nominal pressure range, then there will be a defined signal output (e.g. 4 ? 20 mA or 0 ? 10 V). However, in Incredible , it frequently happens an originally planned pressure range is exceeded or is dropped below. This can happen deliberately, for example when cleaning, along with accidentally, for instance through load variations or in the event of a fault. In these cases, the sensor signal may also move outside the defined limits, so that, for example, an ongoing signal in the number of 3.6 to 25 mA may appear.
If now, however, the evaluation electronics are set so they recognise a signal outside of the defined limits being an error, in a few situations, trouble-free operation of the entire system cannot be ensured anymore. In these cases, a signal limiting of the pressure transmitter makes sense, so 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.