FAQ

What is a Digital sensor? What difference does that make?

Environdata uses its own unique method of communicating between its sensors and its Weather Recorders.

Environdata_Digital_Sensors_Diagram1

 

Originally championed by Australia’s premier scientific body, CSIRO, the sensor sends a continuous square wave or series of pulses (shown below), where the pulse rate is proportional to the signal being sensed, and changes its rate with instantaneous changes in that signal.

Environdata_Digital_Sensors_Diagram2

The weather recorder then counts the pulses to provide an average value for the period being sampled.  Note that the recorder detects the presence or absence of a pulse and not the size of the pulse.

Environdata uses five volt pulses as its signal so that, even in less than ideal conditions, the recorder will easily identify the pulses.  In fact, with a five volt pulse, even one whole volt of electrical noise or contact resistance or cable loss will still result in a reliable signal (count of the pulses). In general, Environdata’s sensor methods result in more reliable signals and better recorded data.