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Terms for subject Metrology (347 entries)
pick-up The primary element of a measuring chain which converts the input variable into a signal suitable for measurement
point drift The change in output over a period of time for a constant input under specified reference operating conditions
polytetra-fluoro-ethylene Usually as an extruded sleeve form not bonded to the meter tube, PTFE is generally suitable for use within the temperature range -50 °C to +200 °C. It has excellent wear resistance against small particles, and is chemically inert. It may collapse when subjected to subatmospheric pressures
polytetrafluoro-ethylene Usually as an extruded sleeve form not bonded to the meter tube, PTFE is generally suitable for use within the temperature range -50 °C to +200 °C. It has excellent wear resistance against small particles, and is chemically inert. It may collapse when subjected to subatmospheric pressures
potentiostatic Type of electrochemical measurement in which the working potential of the electrode is kept constant by external regulation
powder filling q A type of protection of electrical apparatus in which the enclosure is filled with sand or other powder material of specified characteristics so that, in the intended conditions of service, any arc or high temperature occurring within the enclosure will not ignite the surrounding explosive gas atmosphere
pressure loss A loss in pressure will occur as the fluid flows through the sensor. The magnitude of this loss will be a function of the size and geometry of the oscillating tubes, the mass flow rate (velocity) and dynamic viscosity of the process fluid
pressure piping Small-bore piping connecting differential pressure transmitters to the pipe containing the orifice plate
primary device Of an electromagnetic flowmeter: Device containing the following elements: - an electrically insulated meter tube through which the conductive fluid to be metered flows, - one or more pairs of meter electrodes, diametrically opposed, across which the signal generated in the fluid is measured, - an electromagnet for producing a magnetic field in the meter tube. The primary element produces a signal proportional to the flow rate and in some cases the reference signal
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

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