Project Overview
A commercial office building in Southeast Asia faced recurring issues with unstable indoor air quality and high energy consumption. The HVAC system lacked accurate real-time monitoring of humidity and temperature inside air ducts, leading to inefficient control of air handling units (AHUs).
Challenges
- Inconsistent humidity causing discomfort and potential mold risk
- Overcooling due to lack of precise temperature feedback
- High energy consumption from inefficient HVAC operation
- Limited sensor stability in high-humidity environments
Solution
The facility integrated GW1 Humidity & Temperature Transmitters (Duct Type WCH-1 Series) directly into the HVAC duct system.
Key reasons for selection:
- Wide measurement range: -40 ~ +125°C / 0–100% RH
- High accuracy: ±3% RH / ±0.4°C
- Industrial output: 4–20 mA / RS-485 for BMS integration
- IP45 protection suitable for duct environments
- Excellent long-term stability reduces maintenance
Installation
- Installed inside main supply air ducts of AHU systems
- Connected to Building Management System (BMS) via RS-485
- Continuous monitoring of airflow conditions
Results
| Improvement Area | Result |
|---|---|
| Indoor Comfort | Stable temperature & humidity control |
| Energy Efficiency | Reduced HVAC energy consumption by ~15% |
| Maintenance | Lower recalibration frequency |
| Air Quality | Improved IAQ and reduced condensation risk |
Why It Matters in HVAC
Humidity and temperature are core control parameters in HVAC systems:
- Prevent condensation inside ducts
- Maintain thermal comfort
- Optimize cooling load & energy use
- Protect equipment and building structure
Without accurate sensing, HVAC systems will overcompensate → waste energy → reduce system lifespan
Key Takeaway
“What you can’t measure in your HVAC system will cost you — in energy, comfort, and reliability.”
By implementing reliable duct-mounted transmitters, HVAC systems become data-driven, efficient, and stable.
| Model Type | Remote Type | Duct Type | Wall Type |
|---|---|---|---|
| Model | WCH-2 / WCH-2N | WCH-1 / WCH-1N | WCH-3 / WCH-3N |
| Installation | Remote probe (flexible cable) | Installed inside air duct | Mounted on wall / room |
| Application | Hard-to-reach areas / equipment | HVAC duct / AHU system | Indoor environment monitoring |
| Measurement Focus | Point measurement | Airflow condition | Room ambient condition |
| Advantage | Flexible installation | Accurate airflow sensing | Easy installation & display |
| Typical Use | Machine, chamber, cabinet | HVAC system, cleanroom | Office, building, BMS |
| Display Option | Optional display | Optional display | Standard display |
| Accuracy | ±3% RH / ±0.4°C | ±3% RH / ±0.4°C | ±3% RH / ±0.4°C |
| Output | 4–20 mA / RS-485 | 4–20 mA / RS-485 | 4–20 mA / RS-485 |
