Process for calibrating a calorimetric flow indicator

Details Process for calibrating a calorimetric flow indicator Process for calibrating a calorimetric flow indicator

1993-09-27

1995-08-29

Williams, Hezron E.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

374 1, G01F 2500

Patent

active

054450055

ABSTRACT:
The invention relates to a process for calibrating a calorimetric flow indicator to a medium to be measured. The flow indicator has a sensor element that provides a temperature-dependent resistance and which heat up in a short period of time by means of electrical current heat. The resistance variation of the sensor element represents a measure of the flow velocity of a medium flowing by the sensor element. The calorimetric flow indicator is set for a specified medium other than the medium to be measured, with a resistance value Ro at a zero flow and a resistance value R.sub.max at a maximum flow, defining a preset range of measurement R.sub.max --Ro for the specified medium. To calibrate for the medium to be measured, a resistance value Rx of the sensor element at a zero flow of the medium to be measured is measured, the resistance value Ry of the sensor element at a maximum operating flow of the medium to be measured is measured, and a measuring range Ry--Rx, defined by the resistance values Rx and Ry, is automatically brought into coincidence with the preset measuring range R.sub.max --Ro by displacing and extending the measuring range in relation to the preset range.

REFERENCES:
patent: 3638489 (1972-02-01), Buran et al.
patent: 4685324 (1987-08-01), Bourdon et al.
patent: 5156459 (1992-10-01), Baker et al.
patent: 5237523 (1993-08-01), Bonne et al.
patent: 5311762 (1994-05-01), Drexel
Experiments in Fluids, Bd. 8, Nr. 5, 1 Feb. 1990, Berlin, pp. 257-262, XP113890, "Computer-aided calibration and measurements with a quadruple hotwire probe", p. 257, col. 1, line 32-p. 259, col. 1, line 10; Figure 2.

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