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SASH CONTROL SENSORS FOR FUME HOODS. A VERTICAL SASH SENSOR. A PRECISION POTENTIOMETER COUPLED WITH A STAINLESS STEEL, NYLON JACKETED CABLE THAT ATTACHES TO THE VERTICALLY RISING FUME HOOD SASH OR COUNTERWEIGHT CABLE. AS THE SASH MOVES THE REEL, POTENTIOMETER ROTATES TO CHANGE THE RESISTANCE.

RHEOSTATS. PRODUCT IS A REPLACEABLE UNIT USED WITHIN TELECOMMUNICATION POWER FEED EQUIPMENT. IT IS A LARGE RESISTOR THAT CAN BE VARIED UNDER MOTOR CONTROL, TO PROVIDE A VARIABLE LOAD TO THE POWER FEED EQUIPMENT. IT ACTS AS A DUMMY LOAD TO ENABLE THE EQUIPMENT TO BE TESTED OFF LINE. A MAXIMUM OF EIGHT DUMMY LOAD MOTORISED RHEOSTATS ARE FITTED DEPENDING ON THE TOTAL LOAD REQUIRED. EACH RHEOSTAT ASSEMBLY COMPRISES A 5-GANG RHEOSTAT DRIVEN BY A 50V DC MOTOR THROUGH A REDUCTION GEARBOX, THAT PROVIDES AN OUTPUT SHAFT SPEED OF 5 RPM. A HEXAGON-ENDED SPINDLE AT THE DRIVE END OF THE RHEOSTAT SPINDLE PROVIDES A MEANS OF LOCAL MANUAL ADJUSTMENT. THE MOTOR HAS A SPLIT FIELD WINDING TO ALLOW DRIVE IN EITHER DIRECTION. CAMS ON THE OUTPUT DRIVE SHAFT OF THE GEARBOX OPERATE SINGLE POLE CHANGEOVER SWITCHES. THE SWITCHES OPERATE AT THE LIMITS OF TRAVEL OF THE RHEOSTATS IN EITHER DIRECTION.

A THERMISTOR IS A TEMPERATURE SENSITIVE RESISTOR THAT IS A KEY PART OF THE SENSING ELEMENT WITHIN A DETECTOR. MOST HEAT DETECTORS USE THERMISTORS TO SENSE HEAT. ONE THERMISTOR IS EXPOSED TO THE AMBIENT TEMPERATURE AND THE OTHER IS SEALED.

VERTICAL SLIDE DIMMER SWITCH, WHICH IS A TYPE OF VARIABLE RESISTOR. THE SLIDER ENABLES THE VALUE OF THE RESISTANCE IN THE CIRCUIT TO BE VARIED AT WILL AS IT IS MOVED OVER A RESISTIVE COMPOUND THEREFORE CONTROLLING THE OUTPUT TO THE LOAD. THE UNIT SWITCHES OFF WHEN THE SLIDER REACHES THE BOTTOM. DIMENSIONS APPROXIMATELY 8.6X3.8.6X3.5CM.

AN ELECTRICAL FOOT POTENTIOMETER, POWER MAX 0.5W, WITH RESISTANCE UP TO 10KOHMS, SWITCHING RATE 21A, 250V AC. PROTECTION RATING IP67.