Ultra-low SMI pressure sensors in gage and differential configuration from 125 Pa (0.5 inH2O) with a 16-bit digital output.
The SM9000 series offers pressure ranges as low as 125 Pa with a 16-bit I2C digital interface. The ultra-low pressure sensors are available in gage and differential pressure configuration in a JEDEC standard SOIC-16 package with dual vertical or horizontal porting. The total error band after board mount and system level autozero is less than 1%FS. The warmup behavior and long-term stability further confirms its expected performance over the life of the part.
Combining the pressure sensor with a signal-conditioning ASIC in a single package simplifies the use of advanced silicon micro-machined pressure sensors. The pressure sensor can be mounted directly on a standard printed circuit board and a high level, calibrated pressure signal can be acquired from the digital interface. This eliminates the need for additional circuitry, such as a compensation network or microcontroller containing a custom correction algorithm.
Differential pressure ranges ±125 and ±250 Pa
Gage pressure ranges 0-250, 0-300 and 0-600 Pa
Total error band after Autozero: < 1%FS
16-bit I2C Digital interface
Pressure calibrated and temperature compensated output
What is the proof pressure (maximum pressure to which the device can be taken and still perform within specifications (without loss of accuracy) after returning to the operating pressure range) for the SM9000 sensor?
The proof pressure for the ultra-low pressure sensor is 7 kPa (1 PSI).
What is the burst pressure (pressure where part is permanently damaged) of the SM9000 Series?
The burst pressure for the ultra-low pressure sensor is 20 kPa (2.9 PSI).
What is the difference between differential and gage pressure?
dP=P1-P2 is the pressure difference between two points, 1 and 2. P1 and P2 are respective pressure at the two points. This could be across an air flow restrictor in a HVAC system, or across a filter in the HVAC system, or in a ventilator system to detect and control inhalation / exhalation air flow.
Gage pressure is the pressure differential with respect to the atmospheric pressure. Generally -not always, gage pressure is higher than atmospheric pressure, so gage pressure sensors are calibrated to have its output be at minimum at atmospheric pressure, and increase from there. Gage pressure sensors are used to measure e.g. pressure in a pressure in a manifold.