Siemens AQF4150 Duct Rh Temp Sensor Element

Product Description

The SIEMENS AQF4150 is a factory-calibrated replacement sensor element designed for duct-mounted relative humidity and temperature sensing applications. This tip-style element installs directly into compatible Siemens QFA41xx and QFM41xx series duct sensors, restoring accurate RH and temperature measurement without replacing the entire sensor assembly. HVAC controls technicians and building automation specialists use this element to service and maintain duct air quality monitoring in commercial and light industrial environments. Its factory calibration means no field calibration is required at installation.

The AQF4150 is suited for duct sensing applications in commercial HVAC systems where accurate relative humidity and temperature data feeds into building automation systems (BAS) or direct digital control (DDC) networks. Typical installations include air handling units, supply and return duct runs, and mixed-air sensing points. This element is the designated service replacement for existing Siemens QFA41xx and QFM41xx series duct sensor housings already deployed in the field.

Key Features

• Factory-calibrated RH and temperature sensing element — no field calibration required
• Tip-style design for direct insertion into compatible Siemens duct sensor housings
• Designed for replacement service of QFA41xx and QFM41xx series sensors
• Allows sensor housing reuse, reducing replacement cost on existing installations
• Suitable for commercial duct humidity and temperature monitoring applications

Compatibility

The AQF4150 is the designated replacement element for Siemens QFA41xx and QFM41xx series duct humidity and temperature sensors.

Installation Notes

Installation should be performed by a qualified HVAC controls technician or building automation systems professional. Power down the associated control circuit before removing or installing the sensor element. Handle the calibrated sensor tip carefully to avoid contact with the sensing surface, which can affect measurement accuracy. Refer to the applicable Siemens sensor documentation for proper insertion depth and retention procedures.

Technical Specifications

• Sensor Type: Duct relative humidity and temperature sensor element
• Calibration: Factory calibrated
• Compatible Series: QFA41xx, QFM41xx

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: AQF4150