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Terms for subject Metrology (318 entries)

ignition temperature	Lowest temperature of a fuel at which combustion becomes self-sustaining
immunity to temperature change	The ability of the measuring equipment to withstand given changes in ambient temperature
INCONEL	Registered trademark of Inco Alloys International, Inc., Huntington, USA
increased safety e	A type of protection in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks inside and on external parts of electrical apparatus which does not produce arcs or sparks in normal service
independent conformity	The closeness with which the calibration curve of a device can be adjusted to approximate to the specified characteristic curve so that the maximum deviation is minimised
independent non-conformity	The maximum deviation of the actual characteristic (average of upscale and downscale readings) from a specified curve, so positioned as to minimise the maximum deviation
index mark	Any of the major or minor index marks on an instrument scale
indirect measuring method	A method of measurement in which the value of a measured variable is obtained by measurement of other quantities functionally related to the measured variable. Example: Measurement of a pressure by a column of liquid
indirect method of measurement	A method of measurement in which the value of a measured variable is obtained by measurement of other quantities functionally related to the measured variable. Example: Measurement of a pressure by a column of liquid
influence quantity	A quantity which is not the subject of measurement, but which influences the value of the measured variable of the indication of the measuring instrument, e.g. ambient temperature
IR pyrometer	infrared pyrometer
ingress protection	The degree of protection of the enclosure expressed as an IP rating to IEC 60529 or NEMA enclosure classification
ingress protection see_also explosion protection	The degree of protection of the enclosure expressed as an IP rating to IEC 60529 or NEMA enclosure classification
inlet run	Portion of the conduit upstream and downstream of the primary, whose axis is straight and in which the cross-sectional area and shape are constant
input	Information on the measured variable, i.e., the physical, physicochemical or chemical quantity, the size of which is to be acquired and indicated by the measurement
installation	Specification of the installation conditions, in particular any special precautions necessary to obtain the specified performance of the measuring equipment
installation instruction	Instructions, and if appropriate warning, on how to mount the measuring equipment so as to obtain the best performance. These might include orientation, cable length, inlet and outlet run (for flow) emitting angle (microwave and ultrasonics) etc
instrument	A device intended to make a measurement, alone or in conjunction with other equipment
instrument cable	Commercially available cable produced especially for wiring up instrumentation
Instrument Society of America	Body responsible for standardisation of process control instrumentation