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Terms for subject Metrology (318 entries)

DPD glycine tablet	Chemical allowing the separate determination of the concentration of chlorine and chlorine dioxide in mixed samples
Class I, II or III equipment	Classification of protective measures for current carrying components
instrument cable	Commercially available cable produced especially for wiring up instrumentation
wiping contact	Contact which picks up for a limited period of time and subsequently drops out again to the release state
Strouhal number	Dimensionless parameter relating the vortex frequency f generated by a body having a characteristic dimension / to the fluid velocity a. It is given by the formula
long-term drift	Drift: An undesired gradual change in the input-output relationship of a device over a period of time, not caused by external influences on the device
amperometric	Electrochemical measurement method in which a current signal proportional to an external variable is generated
European Committee for Electrotechnical Standardization	European agency for sponsoring research and development projects in electronics and related fields
Process Field Bus	Field bus developed by a consortium of mostly German firms and defined in German standard DIN 19 245, Parts 1-4
dead band	Finite range of values within which variation of the input variable does not produce any noticeable change in the output variable
minimum flow	Flow rate at a sensor, with the measuring signal being flow-dependent downstream from the sensor and flow-independent upstream from the sensor
electromagnetic flowmeter	Flowmeter which creates a magnetic field perpendicular to the flow so enabling the flow rate to be deduced from the induced electromotive force (e.m.f.) produced by the motion of conducting fluid in the magnetic field. The electromagnetic flowmeter consists of a primary device and one or more secondary devices
duty cycle	For a device that operates intermittently, the ration of working time to total time, usually expressed as percent. Also known as "duty factor"
overshoot	For a step response, the maximum transient deviation from the final steady-state value of the output variable, expressed in % of the difference between the final and the original steady-state values
rise time	For a step response, the time interval between the instant when the output signal, starting from zero, reaches a small specified percentage (for instance 10%) of the final steady-state value, and the instant when it reaches for the same time a specified large percentage (for instance 90%) of the same steady state value
display range	For an analogue display unit, the range of analogue values which can be displayed without permanent impairment of the operating characteristics
measuring (effective) range	For an analogue display unit, the range of analogue values which can be displayed without permanent impairment of the operating characteristics
Foundation Fieldbus™	Foundation Field-bus™ is an open, interoperable fieldbus that is based on the ISO's Open System Interconnect (OSI) seven-layer communications model. The Foundation specification is compatible with the officially sanctioned SP50 standards project of the ISA and the IEC
integrated services digital network	Future standard for integration of data highways and telephone networks
hard rubber	Hard rubber is generally suitable for use within the temperature range 0 °C to 90 °C. It has excellent abrasion resistance against small particles and good chemical resistance, particularly to leaching agents, acid and alkalis