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SiemensRoom Temperature & Humidity Sensors

Siemens QFA3171 Room Temperature and Humidity Sensor

<p>The Siemens QFA3171 is a wall-mounted room temperature and humidity sensor designed for building automation systems. It provides dual measurements with 4 to 20 mA analog outputs for both temperature and humidity…

SKU 3G-OTH-71064

Also listed as: QFA 3171 · QFA-3171

Brand
Siemens
Item
QFA3171 Room Temperature and Humidity Sensor
Part Number
QFA3171
Category
Room Temperature & Humidity Sensors
Available to Order
Also known as:QFA3171Siemens
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Siemens
Manufacturer Part Number
QFA3171
Type
-40°F to 158°F, 4 to 20 mA, Polycarbonate, Plastic
Display
No Display
Housing
Plastic
Product Type
Room Temperature and Humidity Sensor
Humidity Output
4 to 20 mA
Mounting Location
Wall Mount
Temperature Accuracy
±0.54°F
Relative Humidity Range
0 to 100%
Temperature Signal Output
4 to 20 mA
Electrical Connection Type
Screw Terminals
Relative Humidity Accuracy
±2% of Full Scale
Compatible Building Automation Protocols
LoRaWAN
For Use With Building Automation Systems
Building Automation System Compatible

Technical Documents

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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

<p>The Siemens QFA3171 is a wall-mounted room temperature and humidity sensor designed for building automation systems. It provides dual measurements with 4 to 20 mA analog outputs for both temperature and humidity, ensuring reliable data for HVAC control. Key specifications include a temperature accuracy of ±0.54°F, a relative humidity range of 0 to 100% with ±2% full-scale accuracy, and a polycarbonate plastic housing with screw terminal connections. This sensor is compatible with LoRaWAN protocols, making it suitable for modern wireless building automation networks.</p><p>Ideal for facility managers, HVAC contractors, and system integrators in Singapore, this sensor supports precise environmental monitoring. As a Singapore-based supplier, 3G Electric offers SGD quotes on request, handles GST for local buyers, and provides fast delivery across Singapore and Southeast Asia.</p>

Frequently Asked Questions

What are the output signals and accuracy of the QFA3171?

The QFA3171 provides 4 to 20 mA outputs for both temperature and humidity. Temperature accuracy is ±0.54°F, and relative humidity accuracy is ±2% of full scale.

Is the QFA3171 compatible with LoRaWAN building automation systems?

Yes, the QFA3171 is compatible with LoRaWAN protocols, as stated in its specifications, making it suitable for LoRaWAN-based building automation systems.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks
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Siemens Products

3G Electric supplies Siemens room 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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Duct-mounted sensor for temperature and humidity measurement in HVAC systems. Provides a 4 to 20 mA humidity output and communicates via BACnet MS/TP. Temperature range 32°F to 122°F with ±0.50 K accuracy; relative humidity range 0 to 100% with ±5% full scale accuracy. Polycarbonate housing with screw terminals
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Duct-mounted sensor for measuring temperature and relative humidity in HVAC air handling systems. Features a digital display, plastic housing, and screw terminal connections. Temperature range 32°F to 122°F with ±0.50 K accuracy; humidity range 0 to 100% with ±5% full scale accuracy. Provides 4 to 20 mA humidity output and communicates via MP-Bus protocol
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Duct-mounted sensor for temperature and relative humidity measurement in HVAC systems. Provides a 4 to 20 mA humidity output with a range of 0 to 95% RH and accuracy of ±5% of full scale. Temperature accuracy is ±0.50 K over 32°F to 122°F. Compatible with BACnet MS/TP building automation protocols. Housing is plastic with screw terminal connections

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Wall-mounted sensor with plastic housing, no display. Provides 0 to 10V DC outputs for temperature (-40°F to 158°F, ±0.54°F accuracy) and relative humidity (0 to 100%, ±2% full scale accuracy). Connects via screw terminals. Compatible with BACnet IP building automation systems for HVAC environmental control
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Wall-mount digital sensor with polycarbonate housing and digital display. Measures temperature from -40°F to 158°F (±0.54°F accuracy) and relative humidity from 0 to 100% (±2% of full scale). Provides dual 0 to 10V DC outputs for temperature and humidity. Connects via screw terminals and supports BACnet IP for integration with building automation systems in HVAC applications

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