Title:
DIFFERENTIAL PRESSURE MEASURING DEVICE
Document Type and Number:
Japanese Patent JP3223501
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the load on a host device by determining the variation of a detected differential pressure signal from the differential pressure signal of one sampling period before, performing a primary delay operation to the variation, and outputting the resulting value as a rocking signal.
SOLUTION: A differential pressure detecting part 1 measures the pressure to be measured as discrete value, and outputs a differential pressure signal to a signal shaping part 2 and a differential pressure absolute value converting part 21 every prescribed sampling period. The signal noise-removed and shaped by the shaping part 2 is outputted from a signal converting part 3. The converting part 21 determines the difference of the differential pressure signal from the differential pressure signal of one sampling period before, converts the differential value to an absolute value, and outputs it to a digital primary delay filter 22. The filter 22 reads the time constant held in a memory 23 in order to determine the average value of the differential absolute value and smoothes the differential absolute value. A rocking signal converting part 24 converts the magnitude of the differential absolute value to a prescribed output signal, and outputs it as rocking signal. Thus, the load on a host computer side can be reduced.
Inventors:
Eiji Taya
Application Number:
JP15540996A
Publication Date:
October 29, 2001
Filing Date:
June 17, 1996
Export Citation:
Assignee:
Yokogawa Electric Corporation
International Classes:
G01L13/00; G01L19/06; G01L27/00; (IPC1-7): G01L13/00; G01L27/00
Domestic Patent References:
| JP8136386A | ||||
| JP8166309A | ||||
| JP5113379A |