In certain applications, the existing or voltage signal of a pressure transmitter must not exceed and/or drop below a crucial value. Legitimate can be ensured with the aid of so-called signal limiting.
Why is a sign clamping necessary to begin with?
If Sacred 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 instance when cleaning, together with accidentally, for example 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 can occur.
If now, however, Alarming are set so that they recognise a signal outside the defined limits being an error, in some situations, trouble-free operation of the complete system cannot be ensured anymore. In these cases, a sign limiting of the pressure transmitter is practical, in order that the output signal is maintained within the mandatory range (e.g. 3.8 ? 21 mA).
Note
A good example of a pressure transmitter with which the voltage signal as well as 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.