Dual-output 'no contact' rotary position sensor is ultra-slim

Paul Boughton

Penny + Giles is introducing the NRH280DP dual-output 'no contact' rotary position sensor. This uses proven, non-contact, programmable Hall-effect technology to provide OEMs with highly reliable and accurate rotary measurement in extreme industrial and off-highway environments. The low-profile sensor, with a 6.5mm profile, provides numerous programmable options. Designed for operation in extreme temperatures, the NRH280DP enables system designers to quickly and easily improve the safety and integrity of their control systems.
The rugged NRH280DP is suitable for use in arduous operating environments and is already being used in diverse applications including articulated dump trucks (tip control), garbage collection vehicles (bin lift control), road sweeping vehicles (four-wheel steering) and Formula 1 racing cars (throttle pedal position).
Penny + Giles' configurable NRH280DP provides OEMs with a wide selection of parameter options including measurement range, and clockwise or anticlockwise direction output. This flexibility provides OEMs with greater control in configuring the sensor to suit their needs and achieve maximum performance. For example, the sensor can be configured so that one signal can be used in a control function while the other is used for position monitoring or display purposes.
Unlike conventional captive shaft rotary position sensors, the NRH280DP has a separate magnet assembly that activates the fully encapsulated Hall-effect sensor with a permissible air gap of between 2 and 7mm. This enables the sensor to be used in extreme environments that are subjected to high shock and vibration, or can endure high-pressure wash-downs (IP69K protected).
The sensor's slim, low-profile housing is claimed to be one of the thinnest available in the industry. Its transmissive properties between the magnet and sensor enable operation through non-magnetic materials, such as gearbox castings. The NRH280DP can operate from either a 5V DC regulated or 9-30V DC unregulated power supply and has over-voltage protection to 40V DC. Each of its dual-output channels can be supplied programmed with any one of 341 different angles in the range 0-20 to 0-360 degrees in one degree increments, and features a 12-bit resolution (0.025 per cent) over the selected angular range.
To ease configuration, NRH280DP is available with analogue (0.5-4.5V DC) or digital (pulse width modulated) signal outputs as standard, but can also be factory programmed to offer 0.1-4.9V DC output range, matching the equivalent signals from a potentiometer. Its two outputs can be used for error checking if they are set up to be opposed (clockwise on the first signal and anticlockwise on the second signal) and the output summed.
The NRH280DP features electromagnetic immunity to 100V/m and it has a very low maximum output signal noise of less than 1mV; this means that no additional signal filtering is required on the output signal. It also has a non-linearity of +/-0.4 per cent. When powered with 5V DC, the NRH280DP has an operating temperature range from -40 to +140 degrees C, with a stability of less than +/-30ppm per degree C, and can also withstand temperatures up to +170 degrees C for 72 hours.
For more information, visit www.pennyandgiles.com