Method and device for calibrating a humidity sensor and sensor arrangement having humidity sensor capable of calibration

US7730759B2 · kind B2 · utility

Assignee

• Testo AG · DE

Inventors

• Martin Rombach · Lenzkirch, DE
• Markus Langenbacher · Lenzkirch, DE

Key dates

• Filing date: Jan 3, 2003
• Grant date: Jun 8, 2010
• Expiry date: Jun 6, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N25/56
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

For calibrating a humidity sensor, the latter is used to measure the relative humidity (U1, U2) at each of two known gas pressure values (P1, P2), likewise to be measured if necessary. At the same time, other ambient conditions are kept constant. A correction value for correction of the measured values of the humidity sensor to be subtracted from the latter is then obtained from the formula: k=((P1/P2)*U2−U1)/(P1/P2−1). The humidity sensor is thus capable of calibration without measurement of the actual humidity value.