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Terms for subject Metrology (318 entries)

root-mean-square voltage	rms voltage
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
Sch	Some standards (ANSI, JIS) feature different pipe schedules of a pipe which are defined by the wall thickness; the higher the schedule value, the thicker is the wall. Different schedules for pipes of one nominal width mean different inner diameters
schedule	Some standards (ANSI, JIS) feature different pipe schedules of a pipe which are defined by the wall thickness; the higher the schedule value, the thicker is the wall. Different schedules for pipes of one nominal width mean different inner diameters
SCS	System for monitoring pH electrodes and/or reference electrodes for breakage or blockage respectively
sensitivity	The change in the response of a measuring instrument divided by the corresponding change in the stimulus
sensor	The primary element of a measuring chain which converts the input variable into a signal suitable for measurement
sensor check system (SCS)	System for monitoring pH electrodes and/or reference electrodes for breakage or blockage respectively
settling time	Time interval between the step change of an input signal and the instant when the resulting variation of the output signal does not deviate more than a specified tolerance (for instance 5%) from its steady state value
shock	A sudden nonperiodic motion caused by a blow, impact, collision, concussion or violent shake or jar. There are two methods used to quantify and measure shock: specification of a value of acceleration and deceleration together with its duration specification of a height or free fall on to a specified flat surface
shock resistance	The ability of measuring equipment to withstand sudden mechanical loading without permanent impairment of operating characteristics
shut-off valve	Used to interrupt medium flow. The movement of the blocking device in valves is linear and parallel to the flow direction
Sievert	Unit of measurement for dose rate
signal	Physical variable, one or more parameters of which carry information about one or more variables which the signal represents. These parameters are called the "information parameters" of the signal
signal on alarm	The values or status assumed by the output signal when there is a fault in the process measuring equipment
sludge concentration profile	Vertical concentration measurement in basins
span	The algebraic difference between the upper and lower limit values of a given range
special fastener	A fastening device designed to deter unauthorized personnel from invalidating the type of protection of an electrical apparatus for explosive atmospheres
specific test report 2.3 for pressure test	Report in which the manufacturer confirms that the products supplied comply with the agreements made on ordering, with the listing of the results of specific tests
standard setting	Quick calibration which allows measurement in 80% of all applications