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Terms for subject Metrology (318 entries)

INTENSOR	"intelligent sensor". Protocol for Smart transmitters developed by Endress+Hauser
reference electrode	Electrode the galvanic voltage of which can be reproducibly set without being influenced by the medium being measured
marking transfer certificate	A certificate that confirms the correct transfer of the material identification stamp of a semi-finished product to a finished product
temperature effect	A change in temperature will affect the properties of sensor materials, and thus will influence the response of the sensor. A means of compensation for this effect is usually incorporated in the transmitter
temperature influence	A change in temperature will affect the properties of sensor materials, and thus will influence the response of the sensor. A means of compensation for this effect is usually incorporated in the transmitter
environmental influence	A change in the output of an instrument caused solely by the departure of one of the specified environmental conditions from its reference value, all other conditions being held constant
Intrinsically safe circuit	A circuit in which any spark or thermal effect produced either normally or in specified fault conditions is incapable, in the specified test conditions, of causing ignition of a given gas or vapour
temperature class	A classification of electrical apparatus for explosive atmospheres based on its maximum surface temperature
closed-control loop	A combination of control units in which the process variable is measured and compared with the desired value (set point) If the measured value differs fom the desired value, a corrective signal is sent to the final control element to bring the controlled variable to the proper value
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
fault	A defect or electrical break-down of any component, or connection between components, upon which the intrinsic safety of the circuit depends
flow measuring device	A device for measuring, or giving an output signal proportional to, the rate of flow of a fluid in a pipe
flow measuring facility	A device for measuring, or giving an output signal proportional to, the rate of flow of a fluid in a pipe
flowmeter	A device for measuring, or giving an output signal proportional to, the rate of flow of a fluid in a pipe
safety barrier	A device for use between intrinsically safe and non intrinsically safe circuits for the purpose of limiting the voltage and current in the intrinsically safe circuits to levels incapable of causing ignition
device	A device intended to make a measurement, alone or in conjunction with other equipment
instrument	A device intended to make a measurement, alone or in conjunction with other equipment
measuring instrument	A device intended to make a measurement, alone or in conjunction with other equipment
meter	A device intended to make a measurement, alone or in conjunction with other equipment
gateway	A device to connect two different networks which translates the different protocols