AH1891-CA4-7 Sensors, Transducers

Magnetic Sensors - Switches (Solid State)

Magnetic sensors and switches are a class of electronic components that detect and respond to changes in the surrounding magnetic field. They are designed to detect and control small changes in magnetic field intensity and can be used in many different applications. The AH1891-CA4-7 is a magnetic sensor from Honeywell and is an example of a solid-state magnetic switch.

Solid-state magnetic switches are devices that use small physical changes to output electrical signals. Depending on the input and type of switch, these sensors can be used for a variety of applications including detecting external magnetic fields, measuring motor currents, controlling electrical currents or reaching a certain threshold.

Application Field

AH1891-CA4-7 is a Hall Effect switch, which is used to detect magnetic fields. It can be used to detect different changes in the field intensity, such as the presence of a permanent magnet and the motion of a moving magnet. Common uses of Hall Effect switches include proximity sensors, door/window open/close detectors, speed sensing, motion detectors, crash sensors, and linear and angular position detection. These switches can also be used to measure the intensity of a magnetic field.

Besides the typical proximity sensing application, Hall Effect switches can also be used for tracking motion, logging industrial equipment usage, and in robotic control systems, for example. In addition, they offer an input for microcontrollers and other logic control applications.

Working Principle

The AH1891-CA4-7 is a solid-state Hall Effect switch that utilizes the Hall Effect principle. This effect occurs when a voltage difference is generated in a magnetic field. This voltage difference is then output as an electrical signal and can be used for various purposes as described before.

The AH1891-CA4-7 uses two separate Hall Effect elements in order to achieve a precise result. A pair of Hall elements are used in order to measure the magnetic flux density and because of the two elements, it is able to accurately indicate when a certain magnetic field threshold is reached. This allows it to act as a switch, providing an output based on certain threshold and direction of the magnetic field being sensed, when the threshold is reached.

Conclusion

The AH1891-CA4-7 is a solid-state Hall Effect switch that provides a versatile and accurate sensing and control capability. It is suitable for a broad range of applications including proximity sensing, crash sensors, motor control, and robotic control systems. Its working principle of using an electrical signal produced by a voltage difference in a magnetic field allows for accurate and reliable data output when used in accordance with its application fields.