Servoflo Corporation offers the MS5701 low pressure sensor
with an I2C or SPI digital interface. Available in either differential or gauge
models, the MS5701 can measure as low as ±2.5 in. H2O up to ±10
in. H2O in a differential version. The gauge model comes in ranges from +2 in.
H2O to +20 in. H2O .
Using the latest in MEMS technology, the MS5701 has a low
supply voltage of 1.8 to 3.6 V with 1 mA power consumption. Furthermore,
the MS5701 pressure sensor has a high resolution of 0.0004 in. of water (0.001
mbar) and a fast conversion of 0.54 milliseconds. A 24-bit pressure and
temperature output allows for integration to any microcontroller. The I2C or
SPI interface communicates up to 20 MHz.
With an operating temperature range of -20 to 85°C,
the MS5701 offers excellent accuracies. For example, a model calibrated for 5
in. of water (differential) has an accuracy of ±0.04 in. at 25°C and
±0.1
in. over the entire operating temperature range. Low hysteresis and high
stability of the pressure and temperature signal make the MS5701 reliable in
demanding, high performing applications. Typical uses for the MS5701 include
respirators, ventilators, CPAP and sleep apnea, and more.