Thru-Shaft Potentiometers 640 Series Datasheet640 Series Thru-Shaft Potentiometers Potentiometers convert rotary motion into a change of resistance, supplying a smooth transition of voltage or current levels. The resulting voltage output may be used to control position transducers in a wide variety of potential applications. The 640 Series Thru-Shaft Potentiometers are actuated by a customer-provided actuator shaft instead of by a shaft/ bushing integral to the sensor. The low-profile housing allows use where space is at a premium. All versions are sealed for dust. Splash-sealed or moisture-sealed options feature O-ring seals between the rotor and housing and cover and epoxy sealing between the leadwires, the housing and the cover. The 640 Series are available in resistances from 1 kOhm to 1 MOhm, inclusive. Tapers include linear and a 360 quadrature voltage to meet a wide range of application requirements. A dual-contact version allows for two mechanically-tracking electrical actions, or true 360 quadrature voltage output. Potential Applications Key Features and Benefits TRanSpoRT aTion Thru-shaft configuration actuated by customer- Position and movement detection in construction/agricultural provided actuator shaft: Allows use in space-constrained vehicles/equipment: applications where there may not be enough room for a Vehicle manual controls (e.g., gear shifters, joysticks, and shaft/bushing integral to the sensor throttles) Reinforced, low-profile housing: Allows use in rugged Pedals environments where space constraints may be present Steering equipment Dust sealed with splash- or moisture-sealed options: Designed to provide protection against dust or moisture inDuSTRiaL ingress Audio/visual equipment dial control Long rotational life of greater than one million cycles: Industrial vehicle attachment position (e. g. forklift truck forks) Promotes extended life in the application Machine control joystick position Robotic arm position Valve actuator position Material handling equipment position THru-SHAFT LOW PrOFILE LONG rOTATIONAL LIFE sensing.honeywell.com 2