概述
SNDH-H 系列霍尔效应速度传感器使用带磁偏置的霍尔效应集成电路，来准确传感铁磁性金属目标物的运动情况。这种专门设计的集成电路 (IC) 和永磁体密封在坚固耐用的探头式封装内。
与铁磁性金属接触后，永磁体的磁通密度将会改变。可通过霍尔效应集成电路进行检测。如果将传感器放置在一个旋转齿轮的圆周上，它将会检测轮齿和齿空间，同时提供频率与齿轮轮速成比例的数字脉冲输出。
实现最佳性能需依赖于下列变量，必须予以综合考虑：目标材料、几何形状和速度、传感器/目标间隙和环境温度。
DESCRIPTION The SNDH-H Series Hall-Effect Speed Sensors use a magnetically biased Hall-effect integrated circuit to accurately sense movement of ferrous metal targets. The specially designed IC (integrated circuit) and a permanent magnet are sealed in rugged, probe-type packages. The flux density of the permanent magnet alters when approached by ferrous metal. This is detected by the Hall ICs. If the sensor is positioned at the circumference of a revolving gear wheel, for example, it detects the teeth and tooth spaces, supplying a digital pulse output with frequency proportional to gear wheel speed. Optimum performance is dependent upon variables which must be considered in combination: target material, geometry and speed, sensor/target gap, and environmental temperature. FEATURES Solid state, non-contacting Hall-effect magnetic sensing allows the device the ability to sense through dust, dirt and debris, enhancing reliability and product life Air gap up to 2,5 mm [0.098 in] allows sensor to be up to 2,5 mm away from target High frequency switching capability (to 15 kHz) allows the device to handle high RPMs (SNDH-H3L-G01, SNDH-H3CG03, SNDH-H3C-G05, SNDH-H3C-G06) O-ring seal allows device to be sealed into housings Two housing materials allow flexibility within the application: stainless steel (corrosion and rust resistant): SNDH-H3LG01; plastic: SNDH-H3C-G03, SNDH-H3C-G04, SNDHH3C-G05 and SNDH-H3C-G06, SNDH-H3P-G01 Various probe lengths (20,3 mm [0.80], 24 mm [0.94 in] 27,5 mm [1.08], 40 mm [1.57 in], 46 mm [1.81 in], 67 mm [2.64 in] simplify use within the application High operating temperature [-40 C to 150 C (-40 F to 302 F)] (SNDH-H3C-G03, SNDH-H3C-G05, SNDH-H3CG06) allows the device to be used in high temperature applications (e.g., engines) Digital current sinking output (open collector) simplifies electrical interfacing to control systems Multiple connector options (Bosch 928000453, DelphiPackard Metripak 150.2 Type 101, Deutsch DT06-3S) simplify installation Omnidirectional capability eliminates the need to align the sensor to the target, allowing the user to simply bolt the device (SNDH-H3C-G0, SNDH-H3L-G01) Zero speed versions indicate that the rotation has stopped, allowing the device to work at extremely low RPMs (SNDHH3L-G01, SNDH-H3C-G04, SNDH-H3P-G01) Stable performance over temperature range and airgap range POTENTIAL APPLICATIONS Transportation Engine camshaft and crankshaft speed Transmission speed Vehicle speed Wheel speed Pump speed Motor speed Industrial Flow meters and flow turbines Pump speed Motor speed
