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Siemens QFM3171 Duct Humidity Temperature Sensor 4-20mA

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Special Price $264.41 Regular Price $293.50
In stock
SKU
QFM3171
Siemens QFM3171 Duct Humidity and Temperature Sensor is a high precision device to monitor environmental conditions in HVAC systems. The temperature and humidity sensor measures from -40 to 180 °F with 100K Ohm sensing element and 36" probe. It provides the HVAC management system with consistent, dependable feedback by using a 4–20 mA current signal for output. The long lasting white finished polymer sensor is ideal for installation in ducting applications. Its 2% accuracy ensures precise measurement is essential for preserving system efficiency and indoor air quality. Temperature and humidity monitoring is an accurate process since HVAC systems can change their operation to improve comfort and energy efficiency. Commercial and industrial HVAC systems typically use.
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HVAC Ventilation Parts, HVAC Duct
Manufacturer:
https://www.partshnc.com/media/catalog/product/p/a/partshnc_siemens_building_technology_ducthumsnsr_420matemp_420_qfm3171.jpeg

Specifications

  • Weight: 0.52 lbs
  • Type: Humidity and Temperature Sensor
  • Color: White
  • Probe length: 36"
  • Sensing element: 100K Ohm
  • Temperature Range: -40 to 180 °F
  • Current Rating: 4-20mA
  • Accuracy: 2%
  • Material: Poly
Manufacturer Name: Siemens Building Technology
Product Number: QFM3171
OEM Part Number: QFM3171
Product Description: Ducthumsnsr, 4-20Ma/Temp 4-20
Weight:0.52lbs/235.87g

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Product Questions (2)
Customer Questions
What maintenance is required for the Siemens QFM3171 Duct Humidity Temperature Sensor?

The Siemens duct humidity and temperature sensor should be kept free of dust and condensation buildup. Inspect wiring connections regularly for looseness or corrosion. Ensure proper airflow around the probe for accurate readings and better operation.

What are common issues with the Siemens QFM3171 Duct Humidity Temperature Sensor?

  • inaccurate humidity/temperature readings due to sensor drift.
  • wiring or signal loss in loop.
  • condensation damage in duct environments.
  • calibration errors affecting output stability.
  • blocked sensor probe airflow restrictions.
  • communication signal instability in long cable runs.

Installation Steps

Step 1: Turn off HVAC power and confirm no live voltage before installation.

Step 2: Select duct location with stable airflow avoiding bends, damp areas, or turbulence zones.

Step 3: Mount sensor probe into duct opening and ensure proper sealing to prevent air leakage.

Step 4: Connect wiring loop with correct polarity and compatible power supply.

Step 5: Secure wiring connections, check calibration settings, and ensure stable signal output.

Step 6: Restore power and verify humidity and temperature readings on control system.