宏传感器弹簧加载的LVDT位置传感器（也称为量程探针或测量头）是控制系统中不可或缺的组件，可确保在建筑地板上准确着陆电梯汽车。随着乘客以2,000英尺/分钟以上的速度在电梯上行驶时，机电控制系统依靠传感器来提供必要的反馈，以适当地对准电梯车在抵达时在建筑地板上的适当对齐。
To ensure a smooth and comfortable ride, elevator cars are suspended by springs within an outer frame that provide cushioning against the effects of acceleration/deceleration and the initial starting and stopping ‘jerks’ caused by inertia. As an elevator is loaded with passengers, these springs compress changing car position within the frame that can affect final car position at the destination floor. To ensure that both cars and building floors properly align upon arrival, Macro Sensors Spring Loaded LVDT position sensors are used to measure the difference between the frame and car position. Specifically, the sensors are measuring ‘spring deflection’ as a result of the passenger load.
Depending upon the elevator manufacturer, sensors are mounted either under or above the elevator car. When measurement is made from above, the probe of the spring-loaded LVDT position is normally compressed, and extends as the load increases. When sensors are installed below the elevator platform, the probe is normally extended, and compresses as load increases. Output is fed into a control system that uses the displacement information to adjust the travel of the frame, so that when the elevator car doors open, the car floor is level with the building floor on which passengers are exiting.
宏传感器弹簧加载LVDT位置传感器是提供此至关重要测量的首选传感器，因为它们的现场证实设计和高可靠性。在AC和DC输入/输出配置中，具有+/- 0.050英寸至+/- 2.0英寸的可用冲程范围（+/- 2.0”（+/- 1.25 mm至+/- 50 mm），这些密封的传感器（IEC IP-68）为设计和制造坚固耐用的坚固耐用，使它们能够在浓重的冲击中生存以及污垢，水，蒸汽和其他腐蚀性元素的影响，而不会影响性能。
Internal construction consists of a spring-loaded shaft running in a precision sleeve bearing connected to the core of an LVDT. The probe shaft of the position sensors is fully extended by a spring exerting a nominal force of 6 to 20 ounces depending upon total range. The contact tip supplied is an AGD standard number 9 made from black oxide hardened tool steel. It is fully interchangeable with other 4-48-threaded AGD contact tips.
宏传感器在AC或DC操作版本中提供其弹簧载荷LVDT位置传感器，但DC操作的单元结合了集成电子设备，可提供4-20mA，单端或双极DC输出与大多数标准PLC兼容的DC输出数据采集系统。宏传感器还为所有弹簧LVDT位置传感器提供了度量校准选项。
Filed Under:Sensor Tips
