Title:
METHOD FOR PROCESSING OUTPUT SIGNAL OF COMPOSITE SENSOR
Document Type and Number:
Japanese Patent JPH03264821
Kind Code:
A
Abstract:
PURPOSE:To prevent the deviation of the measured value of a flow rate when a sensor is switched and to improve measuring accuracy by automatically calibrating the data of the sensor having low precision with the sensor having high precision when the measured flow rate has a value between the specified flow rates of two sensors. CONSTITUTION:As a first flow rate sensor, a thermal semiconductor flow rate sensor which can be continuously set and has low precision is used. As a second flow rate sensor, a highly precise fluidic flow rate sensor 2 which requires certain time for measurement is used. Thus a gas flowmeter using the sensors 1 and 2 is constituted. When the measured flow-rate value FB of the sensor 2 lies between sensor output values F1 and F2 (the first and second specified flow rates), the measured flow-rate value FA of the sensor 1 is calibrated by using the value FB. A correcting coefficient (k) for this calibration is obtained by an expression k.F(1+DELTASA) = FB (where F is the actual flow rate, and DELTASA is the sensitivity change in sensor 1). The measured value FA is multiplied by (k), and the measured value FAC is displayed. Thus, the displaying accuracy of the sensor 1 is improved, and the deviation from the measured value FB of the sensor 2 in switching can be eliminated.
Inventors:
SAKAI KATSUTO
UEKI TAKASHI
HISANAGA TETSUO
UEKI TAKASHI
HISANAGA TETSUO
Application Number:
JP6261990A
Publication Date:
November 26, 1991
Filing Date:
March 15, 1990
Export Citation:
Assignee:
TOKYO GAS CO LTD
YAMATAKE HONEYWELL CO LTD
YAMATAKE HONEYWELL CO LTD
International Classes:
G01F1/20; G01F7/00; G01F25/00; G01F1/00; (IPC1-7): G01F1/00; G01F1/20; G01F25/00
Attorney, Agent or Firm:
Masaki Yamakawa (3 outside)