User-defined display value
In some cases, we want to know more than the percentage of the measurement range, such as the tank content still present in litres. The display value can be parameterised with the Trafag pressure transmitter and switch: Both the lower and the upper limit value can be entered with any value desired.
For design reasons, the pressure sensor can be attached below the minimum level, such as below the regular drain. But there is still pressure, due to the remaining tank contents, which are no longer available for the process. The value at zero pressure can be parameterised with a negative number, so the display effectively shows zero when the minimum level is reached. But this setting only influences the display value, not the analogue output signal. A formula must be stored in the controller to make such a correction.