Electro-pneumatic measuring is one of the non-contact measurement methods. This allows you to measure components without damage and with the least possible error rate. The measuring medium is oil-free compressed air.
Compressed air flows through measuring nozzles. Depending on the distance between the components to be tested, a pressure dependent on the distance is produced in the supply line.
This damming pressure is taken up and measured by a pressure measuring element. At the same time, the continuous air volume is measured.
These measurement results are converted into intelligible measured values in the column and displayed by means of a digital and LED display.
With pneumatic measuring technology, resolutions up to 0.0001 mm can be achieved with small tolerance fields and a suitable surface finish of the component.
Influence of dirt on the measurement:
Since dirt generally affects all types of measurement, pneumatic measuring methods have great advantages over other measuring methods. Remainders of drilling emulsions or coolant and small dirt particles are removed by the outgoing air even before the measurement and thus a correct measurement takes place.
Influence of roughness on the measurement:
The surface roughness of the component under test influences the measurement results measured with the open measuring nozzle. As a result, the impacting compressed air averages the peaks and valleys of the roughness curve.
For this reason, it is recommended to use other roughness methods, such as smooth limit gauges or smooth adjustment rings, to achieve a roughness value greater than Rz 6.3.