Các thuật ngữ trong ISO (7)
variable-length averaging ATT
averaging ATT consisting of several temperature elements of varying length, with all the elements extending upwards from a position close to the bottom of the tank, and where the readout equipment selects the longest, completely submerged temperature element to determine the average temperature of the liquid in the tank
ISO 4266-4:2002(en), 3.5.2
resistance temperature detector
RTD
electrical temperature-sensing element in common use to measure the temperature of the contents of a storage tank
ISO 4266-4:2002(en), 3.2
multiple-point ATT
ATT consisting of multiple (usually three or more) spot temperature elements to measure the temperature(s) at selected liquid level(s)
Note 1 to entry: The readout equipment should average the readings from the submerged temperature elements to compute the average temperature of the liquid in the tank, and may also display the temperature profile in the tank.
ISO 4266-4:2002(en), 3.4
temperature transmitter
instrument that typically provides electrical power to the temperature element(s), converts the temperature measured by the element(s) to an electrical or electronic signal, and transmits the signal to a remote readout
Note 1 to entry: A local readout may be provided. Often, the function of the temperature transmitter is provided by the level transmitter of the automatic level gauge (ALG).
ISO 4266-4:2002(en), 3.6
multiple-point averaging ATT
averaging ATT where the readout equipment selects the individual, spot temperature element(s) that are submerged in the liquid to determine the average temperature of the liquid in the tank
ISO 4266-4:2002(en), 3.5.1
automatic tank thermometer
ATT
instrument that continuously measures temperature in storage tanks
Note 1 to entry: An ATT, which may also be known as an automatic tank temperature system, typically includes precision temperature sensors, field-mounted transmitters for electronic signal transmission, and receiving/readout device(s).
ISO 4266-4:2002(en), 3.1
single-point ATT
spot ATT
ATT that measures the temperature at a particular point in a tank by the spot temperature element
ISO 4266-4:2002(en), 3.3
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