DF: a device other than an ancillary device, required to ensure the correct metrological performance of the system, e.g. valves allowing verification of pressure transducers, atmospheric pressure balancing pipes between pressure transducers, etc.
DF: a device other than an ancillary device, required to ensure the correct metrological performance of the system, e.g. valves allowing verification of pressure transducers, atmospheric pressure balancing pipes between pressure transducers, etc.
DF: a device other than an ancillary device, required to ensure the correct metrological performance of the system, e.g. valves allowing verification of pressure transducers, atmospheric pressure balancing pipes between pressure transducers, etc.