In certain applications, the current or voltage signal of a pressure transmitter should never 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 technical applications, it frequently happens that an originally planned pressure range is exceeded or is dropped below. This may happen deliberately, for example when cleaning, along with accidentally, for example through load variations or in the event of a fault. In such cases, the sensor signal will also move outside the defined limits, so that, for example, an ongoing signal in the number of 3.6 to 25 mA can occur.
If now, however, Lascivious are set so they recognise a signal outside the defined limits as 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 ? First ).
Note
A good example of a pressure transmitter with which the 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.