Instruments That “See” Heat with Precision
When the weather report says it’s *35°C at noon*, there’s a highly accurate instrument behind that number — one that isn’t fooled by sunlight or wind. It measures the air temperature as it really is. One of the most trusted tools in modern weather stations is the *HMP155 temperature and humidity sensor*, known for its precision and reliability.
The HMP155 Temperature & Humidity Sensor
- This is a high-precision electronic device that measures both air temperature and humidity.
- It uses advanced sensing technology that resists drifting or inaccurate readings over time.
- It provides real-time, continuous data — even under challenging conditions like rain or fog.
Where Is the Sensor Installed?
- It’s typically mounted 1.5 to 2 meters above the ground in weather stations.
- It’s placed on a metal stand in an open area, away from buildings, AC units, or any artificial heat sources.
- Ideally, it’s positioned over grass or soil — not concrete — to ensure it reflects the true temperature of the surrounding air.
Why Is the Sensor Shaded?
- Direct sunlight can heat up the sensor itself, leading to false readings.
- To prevent this, the sensor is housed in a radiation shield — a special enclosure that blocks sunlight but allows air to flow freely.
- These shields often look like a stack of white plates or a small fan-like cover and help maintain the accuracy of the data.
How Is the Data Transmitted?
- The HMP155 sends its readings electronically to:
- Forecast displays in meteorological stations
- Global weather databases
- Early warning systems for heatwaves or cold spells
- Data is transmitted as often as every minute — allowing for constant monitoring and rapid weather updates.
Maintenance: The Key to Accuracy
- The sensor needs regular cleaning to remove dust and fine particles.
- High humidity or insects can affect its sensitive components.
- The radiation shield should be inspected regularly and replaced if damaged.
- Engineers play a critical role in calibrating the device and ensuring it stays within its accuracy limits.
In Summary
A temperature sensor is more than just a gadget — it’s the voice of the atmosphere.
Thanks to its accuracy and dependability, we can make informed decisions in health, agriculture, aviation, and more.
With proper care, it continues to speak clearly about the invisible conditions we live in every day — revealing the true face of the air around us.