AL4 series (Gage Pressure)(Low pressure & Digital output) The AL4 pressure sensor series is a low pressure and digital output pressure sensor.It composed of a silicon piezoresistive pressure sensing chip and a signal conditioning integrated circuit.The low-level signal from the sensing chip is amplified, temperature compensated, calibrated and finally converted to digital data that is proportional with the applied pressure. datasheet (PDF353KB) Contact us here for inquiries. contact us Contact us here for inquiries. contact us