Signal clamping in pressure transmitters

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 an originally planned pressure range is exceeded or is dropped below. This can happen deliberately, for instance when cleaning, in addition to accidentally, for example through load variations or in the event of a fault. In such cases, the sensor signal will also move beyond your defined limits, in order that, for example, a current signal in the range of 3.6 to 25 mA can occur.
If now, however, the evaluation electronics are set so they recognise a signal outside of the defined limits as 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 makes sense, so the output signal is maintained within the required range (e.g. 3.8 ? Breakthrough ).
Note
An example of a pressure transmitter with that your voltage signal and also the current signal could be limited may be the model S-20 (for general industrial applications) or the model MH-3 (for mobile working machines) from WIKA.

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