Siemens Building Technology QFM81.2 Sensor
The Siemens QFM81.2 is a professional-grade duct hygrostat designed for precision monitoring and control of relative humidity in commercial HVAC systems. This duct-mounted sensor utilizes a stabilized plastic sensing element that remains accurate and linear even in high-humidity environments. As a veteran technician knows, the SPDT output signal is critical for seamlessly switching between humidification and dehumidification equipment, making it a versatile choice for supply, return, or discharge air monitoring. The potential-free microswitch and temperature-compensated sensing strip ensure reliable on/off humidity control without drifting due to fluctuation in duct temperatures.
Installation is efficient with the included mounting flange, providing an adjustable insertion depth between 5 and 6 inches to accommodate various duct wall thicknesses and insulation layers. The terminal block connection is protected by a hinged internal cover, preventing accidental contact while providing clear access for wiring in the field. For contractors managing clean rooms, data centers, or hospitals, the 15-95% RH sensing range and external setpoint adjustment allow for rapid calibration to meet specific environmental requirements. This Siemens humidity sensor is built to be insensitive to dust and typical duct contaminants, ensuring long-term performance in demanding ventilation setups.
Key Benefits- Stabilized Sensing Strip: Provides high linearity and stability in environments with consistent high humidity.
- Versatile SPDT Switching: Potential-free contacts allow for direct control of both humidifiers and dehumidifiers.
- Field-Adjustable Probe: The 5 to 6-inch adjustable immersion depth ensures the sensing element is positioned in the optimal airflow stream.
- Rugged Construction: Designed with an IP30-rated housing that is insensitive to dust and air contaminants.
- Precise Setpoint Control: Features an external knob for easy relative humidity adjustment between 15% and 95% RH.
- How does air velocity affect the mounting orientation? For velocities under 5 m/s, the sensor holes must face the airflow; for higher velocities, they should be perpendicular to prevent turbulence interference.
- Can this be used as a safety high-limit sensor? Yes, when wired to the normally closed (NC) contacts, it functions as a reliable safety cutout on humidity rise.
- Does this sensor require a separate controller? No, the integrated microswitch allows it to act as a standalone on/off hygrostat for humidification systems.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $164.98
-65%$164.98
$57.74Siemens Building Technology QFM81.2 Sensor
The Siemens QFM81.2 is a professional-grade duct hygrostat designed for precision monitoring and control of relative humidity in commercial HVAC systems. This duct-mounted sensor utilizes a stabilized plastic sensing element that remains accurate and linear even in high-humidity environments. As a veteran technician knows, the SPDT output signal is critical for seamlessly switching between humidification and dehumidification equipment, making it a versatile choice for supply, return, or discharge air monitoring. The potential-free microswitch and temperature-compensated sensing strip ensure reliable on/off humidity control without drifting due to fluctuation in duct temperatures.
Installation is efficient with the included mounting flange, providing an adjustable insertion depth between 5 and 6 inches to accommodate various duct wall thicknesses and insulation layers. The terminal block connection is protected by a hinged internal cover, preventing accidental contact while providing clear access for wiring in the field. For contractors managing clean rooms, data centers, or hospitals, the 15-95% RH sensing range and external setpoint adjustment allow for rapid calibration to meet specific environmental requirements. This Siemens humidity sensor is built to be insensitive to dust and typical duct contaminants, ensuring long-term performance in demanding ventilation setups.
Key Benefits- Stabilized Sensing Strip: Provides high linearity and stability in environments with consistent high humidity.
- Versatile SPDT Switching: Potential-free contacts allow for direct control of both humidifiers and dehumidifiers.
- Field-Adjustable Probe: The 5 to 6-inch adjustable immersion depth ensures the sensing element is positioned in the optimal airflow stream.
- Rugged Construction: Designed with an IP30-rated housing that is insensitive to dust and air contaminants.
- Precise Setpoint Control: Features an external knob for easy relative humidity adjustment between 15% and 95% RH.
- How does air velocity affect the mounting orientation? For velocities under 5 m/s, the sensor holes must face the airflow; for higher velocities, they should be perpendicular to prevent turbulence interference.
- Can this be used as a safety high-limit sensor? Yes, when wired to the normally closed (NC) contacts, it functions as a reliable safety cutout on humidity rise.
- Does this sensor require a separate controller? No, the integrated microswitch allows it to act as a standalone on/off hygrostat for humidification systems.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Siemens QFM81.2 is a professional-grade duct hygrostat designed for precision monitoring and control of relative humidity in commercial HVAC systems. This duct-mounted sensor utilizes a stabilized plastic sensing element that remains accurate and linear even in high-humidity environments. As a veteran technician knows, the SPDT output signal is critical for seamlessly switching between humidification and dehumidification equipment, making it a versatile choice for supply, return, or discharge air monitoring. The potential-free microswitch and temperature-compensated sensing strip ensure reliable on/off humidity control without drifting due to fluctuation in duct temperatures.
Installation is efficient with the included mounting flange, providing an adjustable insertion depth between 5 and 6 inches to accommodate various duct wall thicknesses and insulation layers. The terminal block connection is protected by a hinged internal cover, preventing accidental contact while providing clear access for wiring in the field. For contractors managing clean rooms, data centers, or hospitals, the 15-95% RH sensing range and external setpoint adjustment allow for rapid calibration to meet specific environmental requirements. This Siemens humidity sensor is built to be insensitive to dust and typical duct contaminants, ensuring long-term performance in demanding ventilation setups.
Key Benefits- Stabilized Sensing Strip: Provides high linearity and stability in environments with consistent high humidity.
- Versatile SPDT Switching: Potential-free contacts allow for direct control of both humidifiers and dehumidifiers.
- Field-Adjustable Probe: The 5 to 6-inch adjustable immersion depth ensures the sensing element is positioned in the optimal airflow stream.
- Rugged Construction: Designed with an IP30-rated housing that is insensitive to dust and air contaminants.
- Precise Setpoint Control: Features an external knob for easy relative humidity adjustment between 15% and 95% RH.
- How does air velocity affect the mounting orientation? For velocities under 5 m/s, the sensor holes must face the airflow; for higher velocities, they should be perpendicular to prevent turbulence interference.
- Can this be used as a safety high-limit sensor? Yes, when wired to the normally closed (NC) contacts, it functions as a reliable safety cutout on humidity rise.
- Does this sensor require a separate controller? No, the integrated microswitch allows it to act as a standalone on/off hygrostat for humidification systems.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
