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Siemens QFA3212.EWSN Room Temperature and Humidity Sensor - Room Temperature & Humidity Sensors
SiemensRoom Temperature & Humidity Sensors

Siemens QFA3212.EWSN Room Temperature and Humidity Sensor

The Siemens QFA3212.EWSN is a wall-mounted room temperature and humidity sensor with a plastic housing and no display. It provides a 4 to 20 mA humidity output, a temperature accuracy of ±0.54°F, and a relative…

SKU 3G-OTH-70795

Also listed as: QFA3212EWSN · QFA3212 EWSN · QFA3212-EWSN

Brand
Siemens
Item
QFA3212.EWSN Room Temperature and Humidity Sensor
Part Number
QFA3212.EWSN
Category
Room Temperature & Humidity Sensors
Available to Order
Also known as:QFA3212.EWSNSiemens
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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
QFA3212.EWSN
Type
32°F to 131°F, Polycarbonate, Single Measurement
Display
No Display
Housing
Plastic
Includes
Anchors
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%
Electrical Connection Type
Plug-In
Relative Humidity Accuracy
±2% of Full Scale
Compatible Building Automation Protocols
BACnet MS/TP
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

The Siemens QFA3212.EWSN is a wall-mounted room temperature and humidity sensor with a plastic housing and no display. It provides a 4 to 20 mA humidity output, a temperature accuracy of ±0.54°F, and a relative humidity accuracy of ±2% of full scale over a 0 to 100% range. This sensor is compatible with BACnet MS/TP building automation protocols and includes anchors for installation.

Frequently Asked Questions

What is the Siemens QFA3212.EWSN temperature and humidity sensor used for?

The Siemens QFA3212.EWSN is a wall-mounted room sensor that measures temperature from 32°F to 131°F and relative humidity from 0 to 100%. It outputs a 4 to 20 mA humidity signal and communicates via BACnet MS/TP, making it suitable for building automation systems in commercial HVAC applications.

What are the specifications of the Siemens QFA3212.EWSN sensor?

The Siemens QFA3212.EWSN has a temperature accuracy of ±0.54°F and relative humidity accuracy of ±2% of full scale. It features a polycarbonate plastic housing, no display, plug-in electrical connection, and includes anchors for wall mounting. It is compatible with BACnet MS/TP building automation protocols.

Where to buy the Siemens QFA3212.EWSN worldwide?

3G Electric supplies the Siemens QFA3212.EWSN temperature and humidity sensor to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this BACnet MS/TP compatible sensor.

How to install the Siemens QFA3212.EWSN wall mount sensor?

Install the Siemens QFA3212.EWSN by mounting it on a wall at a representative room height, away from direct heat sources or drafts. Use the included anchors for secure attachment. Connect the plug-in terminals per the wiring diagram for BACnet MS/TP communication and 4 to 20 mA humidity output.

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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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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Wall-mounted sensor for measuring room temperature and relative humidity in building automation systems. Provides dual 4 to 20 mA outputs for temperature and humidity. Temperature range -40°F to 158°F with ±0.54°F accuracy; humidity range 0 to 100% RH with ±2% of full scale accuracy. Plastic housing with screw terminals. Compatible with LoRaWAN protocols

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