Any potential user should ensure, in consultation with the manufacturer, that the EDM is suitable for the process on which it will be installed. It is important to refer to the details on certificates issued as they may contain specific limitations on use. The certificate holders listed have submitted satisfactory test reports and successfully undergone a product manufacturing audit. For instruments used under MCERTS : Performance standards and test procedures for event duration monitors, where an EDM activates when the liquid level exceeds the lowest point at which a discharge shall occur, then this will happen with an uncertainty of ±5mm or better. The MCERTS inspector will determine whether the set up meets the MCERTS requirements for installing and using event duration monitors.