The Analox website has an ADM Aspida product page with all relevant product information and software downloads available.
Analox recommends that 6 mm outer diameter and 4 mm inner diameter PVC tubing should be used with this product.
The gas inlet at the rear of SDA flow meter panel is the lower of the two gas ports. The gas outlet from the rear of the SDA flow meter panel is the upper of the two gas ports.
Connection of the ADM Aspida should be made from the SDA flow meter panel gas outlet port, through the hole to the left of the ADM Display and then connected to the flow adaptor (which is fitted to the front of the ADM Aspida).