Outdoor Temp Humidity and Atmospheric Pressure Sensor, All-in-one

All-in-one outdoor temp humidity and atmospheric pressure sensor designed for temperature, humidity and gas measurement in complex outdoor environments. With a wide temperature range (-40°C to 85°C), humidity range (0-100% RH) and atmospheric pressure range (1-110kPa), it enables comprehensive monitoring of the environment. The temperature and humidity sensor has a start-up time of only 400 milliseconds and a response frequency of up to 2Hz, enabling fast and accurate data acquisition. In addition, the IP65 level protection design ensures reliable operation in harsh outdoor environments, providing stable environmental data support for meteorological, agricultural and other application scenarios.

Specification

Features

• ATO outdoor temperature and humidity sensors have a wide temperature measurement range, can operate stably in the environment of -40℃ to 85℃, adapt to a variety of harsh climate conditions.
• Adopting advanced protective material design, effectively blocking sunlight radiation and rain erosion, and the sensor height can be flexibly adjusted to meet different installation requirements.
• Temperature and humidity sensor response is sensitive, high precision, easy and convenient installation, with long stable performance and service life.
• Strong anti-interference ability and wide voltage power supply design ensure that the equipment can still be accurately measured in complex environments.
• Built-in non-linear correction, reverse connection protection, over-voltage protection and current limiting protection further enhance the safety and reliability of the device.

Dimensional Drawing (unit: mm)

Wiring Diagram

RS485 (digital signal) output wiring diagram (4-wire)

Note: The big circle represents the shielded wire, the marked ground point must be effectively grounded. It is recommended to use shielded twisted signal cable. In order to avoid ground loop shielding layer using a single-ended ground, in the transmitter end of the insulation floating ground, and in the control cabinet end of the ground.

Application

Tips: Working principle of outdoor temperature and humidity sensor

This temperature, humidity and atmospheric pressure integrated sensor uses a high-precision temperature and humidity integrated chip. Temperature is measured by diode temperature sensing p-n junction, which has the characteristics of forward voltage decreasing with temperature change and current remaining unchanged. Humidity is measured by humidity sensitive capacitor, which changes with humidity and capacitance value. Atmospheric pressure is the diffusion of a Wheatstone bridge over monocrystalline silicon, where the pressure of the measured medium changes the resistance of the bridge wall (piezoresistive effect), which is then amplified by an amplifier circuit into a digital signal of the corresponding wet temperature and atmospheric pressure standard.