Wireless pressure sensor
Wireless barometric pressure sensor with Bluetooth 4.2(PresseBox) (Mainz, )
Based on silicon pressure cell
The AMS 4506 wireless pressure sensors are based on a piezoresitive silicon pressure cell, an integrated temperature sensor, an evaluation circuit (ASIC) and a Bluetooth module. The ASIC enables the conversion of the piezoresitive effect into a DC voltage and digitizes the signal by an internal 24 bit ADC. In addition, the temperature is measured and digitized for temperature compensation. The Bluetooth module processes the digital 24 bit values for pressure and temperature and then sends the data to the smartphone, tablet or AMS Bluetooth gateway at a preset transmission interval. The gateway is based on a web page application that can be displayed in a web browser. The app is available for free download from the Google Play Store for the most popular Android devices.
Each sensor is individually calibrated, temperature compensated and tested. Thereby an accuracy of typ. ±2 mbar in the measuring range of 300 - 1200 mbar @25 °C can be achieved. The temperature accuracy is ±1 °C @25 °C. The sensor is designed for a pressure range of 300 - 1200 mbar and for the extended pressure range of 10 - 2000 mbar.
The temperature range is between 0 and 85 °C. The height resolution at sea level is about 13 cm. The radio range is approx. 100 m in free field.
The long-term measurement drift of the sensor is approx. ±1 mbar for the pressure per year. The typical current consumption with the factory settings is approx. 25 µA and is strongly dependent on the sampling rate and the signal transmission interval of the sensor. The preset data sampling rate and signal transmission interval is 5 seconds. The signal transmission interval is automatically adapted to the data sampling rate, but can also be individually set later via the app. The app can also be used to make further settings, set a critical pressure value and activate an alarm function.
Battery power supply
The sensor is powered by a CR2032 battery cell with battery holder located under the lid. The compressed air measurement is done via a small panel on the outer wall. Due to its small size, the sensor can be easily mounted on smooth surfaces or inside a device using double-sided adhesive tape. In addition, there is a drilled hole with a diameter of 3.2 mm on the left and right side for easy mounting. This allows the sensor to be used quickly and access the measurement data easily via the app or gateway.
Wireless pressure sensor AMS 4506: https://www.amsys-sensor.com/products/pressure-sensor/ams-4506-barometric-pressure-transmitter-with-wireless-bluetooth-signal/