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Terms for subject Metrology (318 entries)

primary element	The primary element of a measuring chain which converts the input variable into a signal suitable for measurement
process conditions	Specification of the allowable process conditions under which the measurement equipment can be operated within its specified accuracy limits and/or without permanent impairment of its operating characteristics
process connection	Where appropriate, the type of process connections used by the measuring equipment, indicating nominal diameters, rated pressures and standards
Process Field Bus	Field bus developed by a consortium of mostly German firms and defined in German standard DIN 19 245, Parts 1-4
process pressure limits	The range of pressures to which the wetted parts of the measuring equipment may be subject without permanent impairment of operating characteristics
process pressure range	The range of pressures within which the wetted parts of the measuring equipment are designed to operate within specified accuracy limits
process temperature limits	The range of temperatures of the process medium to which the wetted parts of the measuring equipment may be subject without permanent impairment of operating characteristics
process temperature range	The range of temperatures within which the wetted parts of the measuring equipment are designed to operate within specified accuracy limits
protective cover	A cover or roof that is mounted upon the housing of an instrument to protect it against the effects of sunshine, rain, wind etc
protocol	A protocol is a set of conventions relating to the data format and control procedures necessary for communication between two devices or processes
pure water	Water with a conductivity of 0.1 uS/m to approx. 10 p.S/m at 25°C
quality certificate	Test certificate with test results based on a specific test. Corresponds to inspection certificate 3.1B with regard to content but does not include an approval by the factory expert. The quality certificate is supplied with selected products as part of the documentation without special request
quantisation	Process by which the range of a variable is divided into a finite number of distinct subranges, not necessarily equal, each of which is represented by an assigned value named the quantized value
RACKBUS®	Registered trademark of Mestra AG, Reinach, Switzerland. Proprietary bus for connecting intrinsically transmitters to controlling gateways
RACKBUS® RS-485	Proprietary bus for connecting intrinsically transmitters to controlling gateways
range	The region of the values between the upper and lower limits of the quantity under consideration - usually used with a modifier, e.g. temperature range, measuring range
RBE dose	relative biological effectiveness dose
reapproval	This is the regular check made by the weights and measures office that the instrument is still measuring correctly
reference electrode	Electrode the galvanic voltage of which can be reproducibly set without being influenced by the medium being measured
reference operating condition	The conditions under which the equipment was tested. Reference operating conditions are stipulated operating conditions for testing measurement equipment or the comparison of measured values. They are usually fixed reference values for the influence quantities which are acting upon the measurement equipment