Siemens QFM81.2 Duct Humidity Sensor, Flange Mount, 100 mA to 5 A, 24 V AC/DC
The Siemens QFM81.2 is a duct-mount humidity sensor with a flange-mount housing and included mounting flange. It measures relative humidity from 15 to 95% and provides a temperature signal output of 100 mA to 5 A at…
SKU 3G-OTH-68802
Also listed as: QFM812 · QFM81 2 · QFM81-2
Local availability & support
- Delivery
- Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
- Payment
- Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.
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Product Description
The Siemens QFM81.2 is a duct-mount humidity sensor with a flange-mount housing and included mounting flange. It measures relative humidity from 15 to 95% and provides a temperature signal output of 100 mA to 5 A at 24 V AC/DC, using all-polymer sensing technology. The unit features screw terminals for electrical connection and a fiberglass-reinforced PPS housing.
Frequently Asked Questions
What is the Siemens QFM81.2 duct humidity sensor used for?
The Siemens QFM81.2 measures relative humidity from 15 to 95% in HVAC ducts, outputting a 100 mA to 5 A temperature signal at 24 V AC/DC. It is used in building automation and environmental control systems to monitor and regulate air conditions in commercial and industrial facilities.
What are the specifications of the Siemens QFM81.2 humidity sensor?
The Siemens QFM81.2 is a duct-mount humidity sensor with a flange-mount housing and included mounting flange. It measures 15 to 95% relative humidity, outputs 100 mA to 5 A at 24 V AC/DC, uses all-polymer sensing technology, and has screw terminals for electrical connection in a fiberglass-reinforced PPS housing.
Where to buy the Siemens QFM81.2 humidity sensor worldwide?
3G Electric supplies the Siemens QFM81.2 humidity sensor worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us to source this duct-mount sensor with flange housing and 100 mA to 5 A output.
How to install the Siemens QFM81.2 duct humidity sensor?
Mount the Siemens QFM81.2 in the duct using the included flange, ensuring the sensing element is exposed to airflow. Connect screw terminals to 24 V AC/DC power and the 100 mA to 5 A signal loop. Follow standard HVAC sensor placement practices for representative humidity readings.
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Common applications for SiemensSiemens Products
3G Electric supplies Siemens duct temperature & humidity sensors. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
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Compatible alternatives & equivalents
- Siemens Metal-housed duct temperature sensor for measuring air temperature in HVAC ducts. Outputs 4 to 20 mA signal with ±0.54°F accuracy over 30°F to 250°F range. Hardwired, no display, supports MP-Bus protocol for building automation system integration
- Siemens This duct-mounted temperature sensor measures air temperature within HVAC ductwork. It features a plastic conduit box housing, hardwired connection, and averaging measurement. With a range of 55°F to 95°F and accuracy of ±0.36°F, it supports Modbus protocols for integration into building automation systems