When replacing a temperature and humidity sensor’s Stevenson screen (instrument shelter) in the Philippines’ hot and humid climate, ASA material is a superior choice over ABS. Below is a comparison of their characteristics and recommendations:
1. Material Properties Comparison
| Property | ASA | ABS |
|---|---|---|
| Weather Resistance | ⭐⭐⭐⭐⭐ UV-resistant, withstands high heat and humidity, does not discolor or become brittle under prolonged sun exposure |
⭐⭐ Prone to UV degradation, yellows over time, may deform in long-term humid conditions |
| Corrosion Resistance | ⭐⭐⭐⭐ Resistant to salt spray and acid rain, suitable for coastal areas (e.g., Philippines) |
⭐⭐⭐ Moderate resistance, but prolonged moisture exposure may weaken structure |
| Mechanical Strength | ⭐⭐⭐⭐ Maintains strength at high temperatures |
⭐⭐⭐⭐ Strong at room temperature but softens in heat |
| Temperature Range | -30°C to 80°C (stable) | -20°C to 70°C (may deform at higher temps) |
| Cost | Higher (~20%-30% more expensive than ABS) | Lower |
2. Suitability for Philippine Climate
- High Humidity & Heat: ASA performs better in long-term exposure to tropical rain and heat without warping.
- Strong UV Exposure: ASA contains UV stabilizers, making it ideal for the Philippines’ intense sunlight, preventing sensor accuracy loss due to material degradation.
- Salt Spray Corrosion: If near coastal areas (e.g., Manila, Cebu), ASA’s salt resistance ensures longer durability.
3. Maintenance & Lifespan
- ASA: Lasts 10-15 years, requiring minimal maintenance.
- ABS: May need replacement every 5-8 years, potentially increasing long-term costs.
4. Recommended Choice
- Best Option: ASA – Ideal for permanent weather stations, coastal regions, and high-sunlight areas.
- ABS Alternative – Only for short-term use or tight budgets, with frequent inspections for degradation.
5. Additional Recommendations
- Choose white or light-colored Stevenson screens to minimize heat absorption.
- Ensure the design complies with WMO (World Meteorological Organization) ventilation standards for accurate sensor readings.
Given the Philippines’ climate challenges, ASA material, despite its higher initial cost, significantly reduces long-term maintenance expenses and data inaccuracies.
please contact Honde Technology Co., LTD.
Email: info@hondetech.com
Company website: www.hondetechco.com
Tel: +86-15210548582
Post time: Aug-19-2025