초록 ▼

In a flow measurement system comprising a primary flow sensor and a secondary electronic conversion apparatus for converting high and low fluid pressure signals from the primary flow sensor to an electronic signal output representative of fluid flow, a process for calibrating the system as an integr

In a flow measurement system comprising a primary flow sensor and a secondary electronic conversion apparatus for converting high and low fluid pressure signals from the primary flow sensor to an electronic signal output representative of fluid flow, a process for calibrating the system as an integral unit, comprising the steps of applying a plurality of known reference fluid flow rates to the primary flow sensor over the system's operative range of flow conditions, sensing the electrical output of the secondary electronic conversion apparatus for each of the said plurality of reference fluid flow rates, establishing a correction factor for each of said recorded values of electrical output which will tend to linearize the relationship between fluid flow rate and the electrical output of the measuring system, and storing the correction factors in non-volatile memory in a microprocessor which is part of the secondary electronic conversion apparatus.

대표청구항 ▼

[ We claim:] [1.] A system calibration process for a differential pressure flow measuring system for fluid flowing in a confined conduit, where such system comprises a primary flow sensor and a secondary electro-mechanical conversion apparatus, including electronic memory, for converting high and lo

[ We claim:] [1.] A system calibration process for a differential pressure flow measuring system for fluid flowing in a confined conduit, where such system comprises a primary flow sensor and a secondary electro-mechanical conversion apparatus, including electronic memory, for converting high and low fluid pressure signals derived from the primary flow sensor to an electric signal output representative of fluid flow, comprising the steps of;calibrating the secondary apparatus against known pressures over the operating range of the apparatus to obtain initial output characterization data and storing the characterization data in the electronic memory,sensing the fluid impact pressure and the fluid static low pressure for a plurality of known reference fluid flows to establish a plurality of high and low pressure signals over a range of flows,with the use of the initial output characterization data, transducing the said high and low pressure signals into measured electrical differential pressure signals representative of the difference between the sensed high and low pressure for each of the plurality of reference flow rates,determining a correction factor for the output of the secondary apparatus for each of the plurality of reference flow rates as a function of the deviation of each value of measured differential pressure from the nominal differential pressure corresponding to each of the said plurality of reference flow rates,modifying the data from the initially characterized secondary apparatus by overwriting, in the electronic memory, the initial characterization data with the calculated correction values.