Siemens Building Technology QFM81.21 Hygrostat 323055-751 supporting overall chiller efficiency and

supporting overall chiller efficiency and operational stability

installation involves handling pressurized refrigerant and requires a recovery machine

and NKB series boilers and high-efficiency water heaters

it is not intended for steam applications

Built with a durable brass body and high-quality NBR seals (Buna-N)

Siemens Building Technology QFM81.21 Hygrostat 323055-751 supporting overall chiller efficiency andThe Siemens Building Technology QFM81. 21 is a commercial grade duct hygrostat designed for precision relative humidity control in HVAC systems. Engineered for both monitoring and regulation, this device features a stabilized sensing strip that ensures superior linearity and long term stability, even in high humidity environments or air contaminated with dust. Unlike baseline models, the QFM81. 21 utilizes an internal setpoint adjuster to prevent