PRESSURE MEASURING DEVICE Russian patent published in 1999 - IPC

FIELD: measurement technology. SUBSTANCE: two-wire pickup has pressure sensor including first and second sensor means each having impedance which value varies with change of measured pressure and with change of specified external condition, for instance, line pressure or temperature. There is provided correcting constant impedance which value remains practically invariable under action of established external conditions. Connecting unit connects constant impedance into working coupling in turn with first and second sensor means to generate first and second signals each being function of measured pressure and specified external condition. Means correcting impedance processes first and second signals, for example, with the use of polynomial series or conversion table and makes it feasible to obtain corrected signal of pressure. Given device is characterized by increased measurement accuracy. Its high operational reliability is provided owing to replacement of mechanical means of correction of output signal with electrical means. EFFECT: increased measurement accuracy and high operational reliability. 8 cl, 5 dwg