Indicating or measuring liquid level, or level of fluent solid material

GPHYSICS G01Measuring instruments G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL METERING BY VOLUME

G01F23/00Indicating or measuring liquid level, or level of fluent solid material

G01F23/0007for discrete indicating and measuring G01F23/0015with a whistle or other sonorous signal G01F23/0023with a probe suspended by a wire or thread G01F23/003with a probe suspended by rotatable arms G01F23/0038using buoyant probes G01F23/0046with a stationary probe, where a liquid specimen is separated from the mean mass and measured G01F23/0053with over-flow pipes G01F23/0061characterised by the level signal processing means G01F23/0069particular electronic circuits for digital processing equipment G01F23/0076containing circuits handling parameters other than liquid level G01F23/0084particular electronic circuits for handling non-digital processing equipment G01F23/0092containing circuits handling parameters other than liquid level G01F23/02by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid G01F23/04by dip members G01F23/045cleaning means therefor ( G01F23/14by measurement of pressure G01F23/16Indicating, recording, or alarm devices being actuated by mechanical or fluid means G01F23/161for discrete levels G01F23/162by a liquid column G01F23/164using a diaphragm, bellow as transmitting element G01F23/165of bubbler type G01F23/167with mechanic or fluid indicating or recording G01F23/168with electric indicating or recording G01F23/18Indicating, recording or alarm devices actuated electrically G01F23/185for discrete levels G01F23/20by measurement of weight G01F23/205for discrete levels G01F23/22by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured G01F23/223using a melting or dissolving material as a part of alarm-means G01F23/226measuring the braking of a rotatable element G01F23/24by measuring variations of resistance of resistors due to contact with conductor fluid G01F23/241for discrete levels G01F23/242Mounting arrangements for electrodes G01F23/243Schematic arrangements of probes combined with measuring circuits G01F23/244comprising oscillating circuits G01F23/245with a probe moved by an auxiliary power G01F23/246thermal devices G01F23/247for discrete levels G01F23/248Constructional details; Mounting of probes G01F23/26by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields G01F23/261for discrete levels G01F23/263using capacitors G01F23/265for discrete levels G01F23/266measuring circuits therefor G01F23/268mounting arrangements of probes G01F23/28by measuring the variations of parameters of electric or acoustic waves applied directly to the liquid or fluent solid material G01F23/282for discrete levels G01F23/284Electromagnetic waves G01F23/2845for discrete levels G01F23/288X-rays Gamma rays or other forms of ionising radiation G01F23/2885for discrete levels G01F23/292Light G01F23/2921for discrete levels G01F23/2922with light-conducting sensing elements G01F23/2924for several discrete levels G01F23/2925using electrical detecting means G01F23/2927for several discrete levels G01F23/2928using light reflected on the material surface G01F23/296Acoustic waves G01F23/2961for discrete levels G01F23/2962Transit time measurement G01F23/2963magnetostrictive G01F23/2965measuring wave attenuation G01F23/2966making use of acoustical resonance or standing waves G01F23/2967for discrete levels G01F23/2968Transducers specially adapted for acoustic level indicators G01F23/30by floats G01F23/303characterised by means to prevent fault-level readings due to turbulence of the fluid G01F23/306using radioactive radiation G01F23/32using rotatable arms or other pivotable transmission elements G01F23/34using mechanically actuated indicating means G01F23/345using pneumatically or hydraulically actuated indicating means G01F23/36using electrically actuated indicating means G01F23/363using electromechanically actuated indicating means G01F23/366using optoelectrically actuated indicating means G01F23/38using magnetically actuated indicating means G01F23/40using bands or wires as transmission elements G01F23/42using mechanically actuated indicating means G01F23/425using pneumatically or hydraulically actuated indicating means G01F23/44using electrically actuated indicating means G01F23/443using electromechanically actuated indicating means G01F23/446using opto-electrically actuated indicating means G01F23/46using magnetically actuated indicating means G01F23/48using twisted spindles as transmission means G01F23/50using mechanically actuated indicating means G01F23/505using hydraulically or pneumatically actuated indicating means G01F23/52using electrically actuated indicating means G01F23/523using electromechanically actuated indicating means G01F23/526using opto-electrically actuated indicating means G01F23/54using magnetically actuated indicating means G01F23/543using magnets only as coupling means in a mechanical transmission path G01F23/546using magnets only for directly actuating of switches G01F23/56using elements rigidly fixed to and rectilinearly moving with the float as transmission elements G01F23/58using mechanically actuated indicating means G01F23/585using pneumatically or hydraulically actuated indicating means G01F23/60using electrically actuated indicating means G01F23/603using electromechanically actuated indicating means G01F23/606using opto-electrically actuated indicating means G01F23/62using magnetically actuated indicating means G01F23/64of the free float type without mechanical transmission elements G01F23/66using mechanically actuated indicating means G01F23/665using pneumatically or hydraulically actuated indicating means G01F23/68using electrically actuated indicating means G01F23/683using electromechanically actuated indicating means G01F23/686using opto-electrically actuated indicating means G01F23/70for sensing changes in level only at discrete points G01F23/703using electromechanically actuated indicating means G01F23/706using opto-electrically actuated indicating means G01F23/72using magnetically actuated indicating means G01F23/74for sensing changes in level only at discrete points G01F23/76characterised by the construction of the float