Title:
DIFFERENTIAL PRESSURE TRANSMITTER
Document Type and Number:
Japanese Patent JPH0450620
Kind Code:
A
Abstract:
PURPOSE:To omit additional temperature and pressure sensors and a correction operator by providing a constitution wherein a temperature sensor, a static pressure sensor and functions for operating the corrections for flow rates by using the signals from the sensors are provided in the main part of a differential pressure transmitter. CONSTITUTION:The signals of the differential pressure, the temperature and the static pressure which are measured with sensor parts 10a - 10c are converted into digital values i A/D converter parts 10e - 10g, respectively. The signals are inputted into a microprocessor 10d. The differential pressure signal undergoes extraction of square root. The signal is converted into the signal which is proportional to a flow rate. In a conventional device, the signals of the temperature and the static pressure are used only for correcting the linearily of the differential pressure sensor. In this transmitter, the signals of the temperature and the static pressure are used to perform the flow-rate correcting operation for converting the flow rate into the flow rate corresponding to the actual values of the tmperature and the pressure. The flow rate after the correction from the microprocessor 10d is converted into the analog value in a D/A converter 10h. The signal is outputted to the outside as the electric signal.
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Inventors:
HARUO HIROSHI
Application Number:
JP15298690A
Publication Date:
February 19, 1992
Filing Date:
June 12, 1990
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G01F1/00; G01F1/34; (IPC1-7): G01F1/00; G01F1/34
Attorney, Agent or Firm:
Soga Doteru (6 people outside)
Next Patent: JPH0450621