(0)G05D:4/4:
IPC6
SECTION G - PHYSICS
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
G05D
5/5
<<   >>   G05D016/00 - G05D027/02  

16
/ 00 Control of fluid pressure

16
/ 02 • Modifications to reduce the effects of instability, e.g. due to vibrations, friction, abnormal temperature, overloading, unbalance (vibration-dampers F 16 F 7/00)  

16
/ 04 • without auxiliary power  

16
/ 06 • • the sensing element being a flexible member yielding to pressure, e.g. diaphragm, bellows, capsule  

16
/ 08 • • • Control of liquid pressure  

16
/ 10 • • the sensing element being a piston or plunger  

16
/ 12 • • the sensing element being a float  

16
/ 14 • with auxiliary non-electric power [2]  

16
/ 16 • • derived from the controlled fluid  

16
/ 18 • • derived from an external source  

16
/ 20 • characterised by the use of electric means  
 

 17
/ 00 Control of torque; Control of mechanical power

17
/ 02 • characterised by the use of electric means  
 

 19
/ 00 Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase

19
/ 02 • characterised by the use of electric means  
 

 21
/ 00 Control of chemical or physico-chemical variables, e.g. pH-value [3]

21
/ 02 • characterised by the use of electric means  
 

 22
/ 00 Control of humidity [2]

22
/ 02 • characterised by the use of electric means  
 

 23
/ 00 Control of temperature (automatic switching arrangements for electric heating apparatus H 05 B 1/02)

23
/ 01 • without auxiliary power  

23
/ 02 • • with sensing element expanding and contracting in response to changes of temperature (G 05 D 23/13 takes precedence)  

23
/ 08 • • • with bimetallic element (arrangement of valves and flow lines specially adapted for mixing fluid F 16 K 11/00)  

23
/ 10 • • • • with snap-action elements (for valves F 16 K 31/56)  

23
/ 12 • • with sensing element responsive to pressure or volume changes in a confined fluid  

23
/ 13 • • by varying the mixing ratio of two fluids having different temperatures  

23
/ 185 • with auxiliary non-electric power [2]  

23
/ 19 • characterised by the use of electric means  

23
/ 20 • • with sensing elements having variation of electric or magnetic properties with change of temperature (G 05 D 23/13 takes precedence)  

23
/ 22 • • • the sensing element being a thermocouple  

23
/ 24 • • • the sensing element having a resistance varying with temperature, e.g. thermistor  

23
/ 26 • • • the sensing element having a permeability varying with temperature  

23
/ 27 • • with sensing element responsive to radiation  

23
/ 275 • • with sensing element expanding, contracting, or fusing in response to changes of temperature  

23
/ 30 • • Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature (automatic controllers in general and not restricted to control of temperature G 05 B)  

23
/ 32 • • • with provision for adjustment of the effect of the auxiliary heating device, e.g. as a function of time  
 

 24
/ 00 Control of viscosity

24
/ 02 • characterised by the use of electric means  
 

 25
/ 00 Control of light, e.g. intensity, colour, phase (mechanically operable parts of lighting devices for the control of light F 21 V; optical devices or arrangements using movable or deformable elements for controlling light independent of the light source G 02 B 26/00; devices or arrangements, the optical operation of which is modified by changing the optical properties of the medium of the devices or arrangements for the control of light, circuit arrangements specially adapted therefor, control of light by electro-magnetic waves, electrons or other elementary particles G 02 F 1/00) [4]

25
/ 02 • characterised by the use of electric means  
 

 27
/ 00 Simultaneous control of variables covered by two or more of the preceding main groups

27
/ 02 • characterised by the use of electric means  
 

 29
/ 00 Simultaneous control of electric and non-electric variables

 

 

 
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