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Technical Specification Sheet

Document No. 149-992

September 16, 2019

Siemens Industry, Inc.

Page 1 of 4

QFA3100/4100 Series Relative Humidity

Sensors for Critical Environments or

Outdoor Use

Description

QFA3100 and QFA4100 Series sensors are

used in HVAC systems where high accuracy

and short response times for measuring

relative humidity are required. The sensors

maintain a +/- 2% RH accuracy from 0 to

100% RH.

Typical applications include:

• Pharmaceutical facilities

• Laboratories

• Hospitals

• Indoor swimming-pools

• Computer and data processing centers

• Greenhouses

Sensors are available with either 0 to 10V or

4 to 20 mA output signals. Options include

an LCD display and additional analog output

for temperature.

The QFA3100 Series sensors feature an

enclosure with gaskets and may be installed

outdoors with an AQF3100 weather shield

(sold separately).

NOTE: Units with display are not intended

for outdoor use.

The QFA4100 variants come with a three-

point, independently-certified calibration

certificate. The certification is easily renewed

by installing a new certified sensing element.

The AQY Series cables enable the sensing

element to be remotely mounted up to 30

feet from the sensor.

QFA31xx

QFA31xx with AQF3100

Weather Shield

QFA31XX with Display

Replacement Sensing

Element

Summary of content (4 pages)

PAGE 1
Technical Specification Sheet Document No. 149-992 September 16, 2019 QFA3100/4100 Series Relative Humidity Sensors for Critical Environments or Outdoor Use Description QFA3100 and QFA4100 Series sensors are used in HVAC systems where high accuracy and short response times for measuring relative humidity are required. The sensors maintain a +/- 2% RH accuracy from 0 to 100% RH.
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Specifications – Humidity Element Measurement range 0 to 100% RH Accuracy 2% RH, 0 to 100% RH @ 73F (23C) Temperature effect Less than 0.1% per degree C Time Constant < 20 seconds Output signal 4 to 20 mA or 0 to 10 Vdc, 0 to100%RH, linear, proportional Specifications–Temperature Element (for combination RH/T units only) Measurement range (selectable) 32 to 122F (0 to 50C) (Default) -31 to 95F (-35 to 35C) -40 to 158F (-40 to 70C) Jumper Position R2 R1 R3 Accuracy 0.
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Ordering Information, Continued Accessories AQF3101 AQF3150 AQF4150 AQF3100 7466201040 AQY2010 AQY2030 Replacement filter cap Replacement sensing element - standard Replacement sensing element - certified Weather shield for outdoor use Replacement 1/2-inch rigid conduit adapter Remote sensing cable, 10 feet (3 m) Remote sensing cable, 30 feet (9 m) Dimensions Figure 1. QFA31 Series Sensors Dimensions in Inches (Millimeters). Siemens Industry, Inc.
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Dimensions, Continued Figure 2. QFA41 Series Sensors Dimensions in Inches (Millimeters). Figure 3. QFA31 Series Sensors with AQF3100 Dimensions in Inches (Millimeters). Information in this document is based on specifications believed correct at the time of publication. The right is reserved to make changes as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners. © 2019 Siemens Industry, Inc. Siemens Industry, Inc.