Monochial technology used in modern electronic devices can also be used to make pressure sensors. Sensors made with monochial technology have very little hysteresis and very low aging speed.2810The air pressure sensor has excellent performance, and it does not actually have hysteresis, temperature drift and aging.It is also not sensitive to mechanical acceleration and can be operated from any position, and the probe is waterproof.

Prior to measurement, the small sensing element of the probe can be heated to a specific temperature to reduce errors caused by ambient temperature changes.2810Air pressure sensor4×4mmAs a sensing element, a small silicon chip is a thin film in the center of the silicon wafer, which is exposed to atmospheric pressure on one side and a vacuum on the other side.Films have4The Whitstone bridge consisting of diffusion resistors has an output signal proportional to the atmospheric pressure, so the chip is used to directly measure the atmospheric pressure.

There is also a temperature sensing resistor on the chip and4These resistors are connected to external control circuits to control the chip to be heated and constant temperature before measurement60°C, the advantage of this is that the probe has sufficient time to stabilize the temperature.The sensor should be connected to one of the last measurement channels of the measuring system.

The power consumption of heating the silicon chip to 60°C is related to the ambient temperature. When the ambient temperature is 60°C, the power consumption will be zero, and the ambient temperature will decrease, and the power consumption will increase linearly; when the ambient temperature is -40°C, the power consumptionMaximum, about 70 mAh.The probe stops heating during reading.

(1) Note: Standard ranges can be used for heights less than or equal to altitude400 noIf you need to install it to a higher place, you need to inform the manufacturer of the installation location height in advance before shipping.The relationship factors between the measurement value of the air pressure and the altitude are shown in the table below.