DEVICE MEASURING PRESSURE AND TEMPERATURE IN HOLE Russian patent published in 2000 - IPC

FIELD: measurement technology, measurement of geophysical parameters in hole. SUBSTANCE: device measuring pressure and temperature in hole has two-arm pressure converter with resistance-strain gauges, communication line, multichannel analog-to-digital converter connected to microprocessor. First lead-out of current source is directly linked to first input of multichannel analog-to-digital converter and via first wire of communication line to first arm of two-arm strain gauge bridge and second lead-out of current source is connected with one end via current-limiting resistor and plus of first diode to second input of multichannel analog-to-digital converter and via second wire of communication line to common point of arms of two-arm strain gauge bridge and with another end via minus of second diode is linked to third input of multichannel analog-to-digital converter and via third wire of communication line is connected to second arm of two-arm strain gauge bridge. Device is supplemented with low-inertia temperature-sensitive resistor placed in parallel with choke and connected with one lead-out to fourth wire of communication line ( armoring of geophysical cable ) and with another lead-out to common point of arms of two-arm strain gauge bridge. Double position key is linked to first lead-out of current source connecting in position 1 current source via first wire of communication line to first arm of two-arm strain gauge bridge and in position 2 it connects current source via fourth wire of communication line ( armoring of geophysical cable ) to lead-out of low-inertia temperature-sensitive resistor. EFFECT: widened functional capabilities of device. 1 dwg