In certain applications, the existing or voltage signal of a pressure transmitter must not exceed and/or drop below a critical value. This could be ensured with the aid of so-called signal limiting.
Why is a sign clamping necessary in the first place?
If the pressure on a pressure transmitter lies within the nominal pressure range, then you will have a precise signal output (e.g. 4 ? 20 mA or 0 ? 10 V). However, in Miracle , it frequently happens an originally planned pressure range is exceeded or is dropped below. Simplistic may happen deliberately, for instance when cleaning, along with accidentally, for example through load variations or in the event of a fault. In such cases, the sensor signal may also move outside the defined limits, so that, for example, an ongoing signal in the range 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 some situations, trouble-free operation of the entire system can’t be ensured anymore. In such cases, a signal limiting of the pressure transmitter makes sense, so 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 as well as the current signal can be limited may be the model S-20 (for general industrial applications) or the model MH-3 (for mobile working machines) from WIKA.