Description
Siemens QFM81.21 Duct Hygrostat Overview
The Siemens QFM81.21 is a duct-mount hygrostat engineered for accurate relative humidity monitoring and control in commercial and industrial HVAC duct systems. Designed as part of Siemens Building Technology’s trusted sensor lineup, this hygrostat delivers dependable switching action across a broad 30 to 90% relative humidity (RH) range, making it well-suited for air handling units, ventilation systems, and building automation applications.
Key Features
- Humidity sensing range: 30 to 90% relative humidity (RH)
- Duct-mount installation for direct in-duct humidity monitoring
- Designed for integration with building automation and HVAC control systems
- Reliable switching output for humidity-based control sequences
- Compact, durable housing suitable for commercial HVAC environments
- Manufactured by Siemens Building Technology — a globally recognized controls brand
Applications
- Air handling units (AHUs) requiring humidity limit control
- Commercial ventilation and HVAC duct systems
- Building automation system (BAS) humidity monitoring points
- Dehumidification and humidification system control
- Industrial and institutional HVAC installations
Why Choose the Siemens QFM81.21?
Siemens Building Technology products are engineered to meet the demanding requirements of modern commercial HVAC and building automation systems. The QFM81.21 duct hygrostat provides a cost-effective, reliable solution for maintaining proper humidity levels within duct systems, helping to protect equipment, improve indoor air quality, and support energy-efficient building operation.
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