MANOTRONE Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: manotrone has bottle 11 of evacuated air housing cathode 1 with heater 2, immobile anode 3, mobile anode 4 joined to flexible sensitive element 13, coupling branch pipe 15 with globe valve 18 and compression gear in the form of bellows 19 with fixture for its compression installed in branch pipe 15 between valve 18 and flexible sensitive element 13. Space of bellows 19 is connected to measurement reservoir of manotrone which volume is limited by flexible sensitive element 13 and globe valve 18. Compression gear has constant compression factor where V_o is change of volume of bellows 19 with its compression. Manotrone is placed into bridge measurement circuit which arms are formed by anode loads R_a and by interelectrode gaps of manotrone. The latter is supplied from sources of anode and filament voltages. For control over anode voltage there is used adjustment resistor R_ad. Manotrone has graduation characteristic I_out= f(P) and compression characteristic - dependence of changes of ΔI_gr of output current I_out on values of this current under fixed magnitudes of pressure in measurement reservoir. When checking correspondence of readings of manotrone to initial graduation characteristic and when testing its sensitivity by current and pressure measurement reservoir is cut off by valve 18 from system and value of current is read by output measurement device. Then squeezing bellows 19 compression is carried out and value (after compression) is measured. Further on is calculated. If sensitivity of manotrone changes from moment of reading of its characteristics I_out=f(P) and ΔI_gr=f(I_out) value ΔI_ch differs (for instance, is smaller) from value ΔI_gr, determined from dependence ΔI_gr=f(I_out) for value with δI=ΔI_gr-ΔI_ch. To correct sensitivity, that is to restore its initial value (and consequently initial graduation characteristic) it will be necessary to increase value of current by magnitude by rise of anode voltage with the aid of adjustment resistor R_ad. Obtained value of current corresponds to values ΔI_gr.ch by compression characteristic ΔI_gr.ch= f(I_out). In this case value of sensitivity is raised to initial value Ψ_ip and graduation characteristic is brought to initial form I_out=f(P). EFFECT: increased precision of measurements thanks to correction of sensitivity of manotrone. 3 dwg