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Relative Humidity Signal Conditioner/Transmitter Probe

Economical RH Sensor/Transmitter


Item# HX71-MA

Please contact Technical Sales Team for assistance.
Economical RH Sensor/Transmitter HX71-MA HX71-MA

This product has been discontinued, for alternative products, please consider the HX300A Series

  • 316 SS Housing
  • Accurate to ±4% RH @ 23°C
  • 3 Different Output Models: 4 to 20 mA, 0 to 1 Vdc or 0 to 5 Vdc
  • Removable Stainless Steel Sensor Cap
  • Ideal for Wall or Duct Mounting

HX71-MA Model Options

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Output Type
Supply Voltage Type
Input Type
Input Ranges

The HX71 Series relative humidity sensor/transmitter provides a reliable and economical method for most relative humidity monitoring applications. The compact design is ideal for wall or duct mounting. Each unit is factory calibrated to provide excellent sensitivity, fast response, and stability. The unit features a simple installation and hookup. The linearized current or voltage output permits interfacing with most display and control devices like meters, controllers, recorders, and data loggers. The design features a 316 SS NEMA 4 (IP66) housing and includes a shielded output cable with stripped wire leads. A mounting kit is available that allows for wall or duct mounting.

Accuracy RH:@23°C ±4% RH from 15 to 85%RH; ±4.5 % RH below 15 and above 85%RH
Note: For Optimum performance, Unit should be operated in >1 MPH of moving air.”
Input Voltage Range
Model HX71-MA: 8 to 12 Vdc (polarity protected)
Model HX71-V1, HX71-V2: 8 to 24 Vdc (polarity protected)
HX71-MA: 4 to 20 mA for 0 to 100% RH
HX71-V1: 0 to 5 Vdc for 0 to 100% RH
HX71-V2: 0 to 1 Vdc for 0 to 100% RH
Red Wire: + power
Black Wire: + output/return
HX71-V1, HX71-V2:
Red Wire: + power
Black Wire: - power/output
White Wire: + output
RH Temperature Compensation: -25 to 85°C (-13 to 185°F)
Repeatability: ±1% RH
Housing: 316 stainless steel
Connections: 2 m (6') shielded cable, stripped leads, PVC sheath
Dimensions: 130 x 16mm D (5.125 L X .625" D)
Weight: 67 g (0.18 lbs)
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Rated 5 out of 5 by from Great product We use this product for some equipment. Laboratory, food, industrial, etc.
Date published: 2015-12-05
Rated 5 out of 5 by from Solid product I bought this unit last month and I'm extremely impressed with the build quality and performance. Easily one of the best performing sensors in this price range I've purchased.
Date published: 2016-03-24
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If 24 volts runs through the signal wire, will it mess up the sensor?

Asked by: Dannyboy
HX71-MA requires 8 to 12 VDC supply. 24 VDC on supply could damage the unit. HX71-V1 and HX71-V2 require 8 to 24 VDC supply.
Answered by: NorwalkAE_RS
Date published: 2019-09-03

Hi, I want to know what is the pressure range that the sensor works.

Asked by: alvaroomf
This transmitter is designed and calibrated for non pressurized environment.
Answered by: NorwalkAE_RS
Date published: 2019-09-03

We are going to put one of these sensors in somewhat dusty environment. Previously we had a HX71-V1 RH Sensor and it came with a protective cap made of some white porous material. I am wondering if there is such item for the current sensor?

Asked by: Vasily
You can purchase the IP-SC which is a porous stainless steel cap.
Answered by: ANB ENG
Date published: 2020-08-26

is HN71-V1 model waterproof?

Asked by: kadasd
Thank you for your inquiry kadasd. No, the HX71-V1 is not waterproof.
Answered by: Application Engineer SP
Date published: 2021-07-08

What is the temperature range that this sensor can be subjected to without damage either powered or unpowered? I want to use this sensor in a temperature / humidity chamber that can operate from -70C to 180C and want to make sure it would not be damaged.

Asked by: da4380
Hi da4380, Thank you for the inquiry. Operating temperature range is -25 to 85ºC (-13 to 185ºF) non condensing environment. Formation of frost would also drive the sensor in to over range condition. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2021-11-16

If this probe is subjected to -75C while powered but not being used to measure humidity, will it perform properly when it comes back to its operating temp? Likewise if it is subjected to 180C will it perform properly when it returns to its operating temp?

Asked by: da4380
Hi DA4380 Thank you for the inquiry. Temperature exposure beyond operating limits may cause shift in calibration or damage to components. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2021-11-29
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Wall/duct mounting kit
13 In Stock
Accessories & Options
4-conductor shielded cable, 30 m (100')
35 In Stock
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