When a non-retractable transducer needs to be taken out of the flow cell, the meter and the process line must be de-pressurized and have ambient temperature suitable to handle.

In case of retractable transducers, it is only allowed to exchange these retractable transducers during operation of the meter when the procedure for exchanging transducers, as described in the manual from the manufacturer, is strictly followed and if it is allowed by the company safety regulations.