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USB Temperature & Humidity Sensor with Datalogging Software


Item# RH-USB

 This item is available for quick shipping
Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $194.78
5-9 $185.04
10-24 $181.15
25-49 $173.35
50-99 $169.46
100+ $165.56

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Lead Time ( If not in Stock): 5 Days

USB Temperature & Humidity Sensor with Datalogging Software RH-USB RH-USB
  • USB Probe for Humidity and Temperature
  • Free Software Converts Your PC into a Humidity and Temperature Meter, Data Logger or Chart Recorder
  • Accurate to ±3% Relative Humidity, ±1°C (±1.8°F) Temperature
  • 316 SS Housing and Removable Stainless Steel Sensor Filter
  • Suited for Wall or Duct Mounting
5 Year Warranty

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Measurement Type
Data Interface

Product Specs

The RH-USB relative humidity/ temperature sensor provides a standard USB output that directly feeds relative humidity and temperature directly into your PC. The free software displays,datalogs, and graphs the measurements. 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 with a direct USB connection. The free user software converts your PC into both a humidity and temperature meter, chart recorder or data logger. The design features a 316 SS NEMA 4 (IP66) housing. A mounting kit is also available that allows for wall or duct mounting.

    Range: -17 to 49ºC (1 to 120ºF)
    Accuracy: ±1ºC (±1.8°F)
Relative Humidity:
    Range: 2 to 98% RH
    Accuracy: ±3% RH (@ 15 to 90% RH)
Repeatability: ±1% RH
PC Interface: USB
USB Cable: Integral to sensor, 2 m (6') (shielded) Type A plug
Software (Included): Requires Windows® 2000, XP, or Vista operating system
Housing: 316 stainless steel
Dimensions: 138 L x 16 mm D (5.5 x 0.625")
Weight: 67 g (0.18 lbs)

Rated 5 out of 5 by from Exactly what was needed! We have had this unit installed and working with a MS Access database that reads the Temp / RH on a timer and prints it on the calibration certificate. Working perfectly so far!
Date published: 2016-11-14
Rated 4 out of 5 by from Easy Temp/Humidity Logging I bought this temperature/humidity probe for our physical testing lab and attached it to the USB port of a PC attached to a test instrument running in lab ambient conditions. The probe was easy to install after downloading Omega's software and logs our testing conditions but I had to get help running the software. Omega's data logging team was able to help.
Date published: 2016-11-07
Rated 5 out of 5 by from Great product for awesome price! just bought this product a week ago and couldn't be more pleased. The usb and software makes using this device so easy and just requires downloading the software. The data is very very easy to copy and paste to excel. The software's plotting program is not the best but is good for a quick view of whats going on. 100% would recommend and I already thinking about how I can buy more sensors from omega... seriously so easy to use.
Date published: 2016-05-24
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How can I connect my own software to the sensor? Do you provide a list of commands that can be sent via Serial communication?

Asked by: bart30332
You would need to use this software to have it work with the computer: ftp://ftp.omega.com/public/DASGroup/products/RH-USB/TRH%20Central_1.3.17.0721_online.zip If you want to use the telnet commands, here is the list: ftp://ftp.omega.com/public/DASGroup/products/RH-USB/RH_USB%20Command%20Reference.pdf Thank you for your question.
Answered by: Application Engineer
Date published: 2019-07-29

Is this require to be calibrated annually?

Asked by: JAM1991
Performance of the sensor can vary depending on frequency of use, application and storage conditions, so there is no simple answer to your question. Calibration requirements are based on your company procedures. Some companies require equipment to be calibrated annually. Others are comfortable with calibration only when the item readings are drifting from the specs.
Answered by: Application Engineer DA
Date published: 2020-03-17

How is it that I am not able to configure that device under TOOLS > CONFIGURE > CHANNEL X? We ran the software in administrator mode. Serial No is not display correctly. The configure device button is gray out. What now?

Asked by: MaxV
Hi MaxV For assistance in software set please email our data acquisition group at DAS@OMEGA.COM. Or you can call in and request assistance over the phone. 800-359-1660 and select Data Acquisition. Best regards OMEGA
Answered by: AENorwalk
Date published: 2020-04-03

Does this unit come with a calibration certificate? Does the unit need to be sent back to an authorized Omega dealer for re-calibration? Need to know for non-US locations.

Asked by: LeahM
Thank you for your question. All Omega products are provided with CAL-1 ( cert of conformance). You can request a Cal-2 ( nist instrument calibration) which is no charge when you place an order. If service is required you can send back directly to Omega. Just contact Customer Service-1-800-622-2378 or CSERVICE@OMEGA.COM.
Answered by: Raptor
Date published: 2020-08-20

Is this sensor pressure rated? I.E. if placed in a sealed system (45psi), will it leak pressure through the sensor?

Asked by: seend
Thank you for the inquiry. This sensor is not rated for pressure. It would leak through. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2021-06-17

My RH-USB probe came with a white, porous plastic/teflon cover that slides over the end, blocking the inlet screens. Does this cap serve some purpose other than to keep crud from getting in the probe during shipping? Do I run the probe with it on or off?

Asked by: Sonartech
Thank you for your inquiry Sonartech. The purpose of the cap is for protection during shipping. You can still use to cover the sensor for protection.
Answered by: Application Engineer MC
Date published: 2021-03-23

What is the cost of recalibration for this sensor?

Asked by: bob2727
Hi Bob2727, Thank you for the inquiry. For a current price estimate for a return for NIST traceable calibration ( "Cal-3" ) please email a request to cservice@omega.com. You might also try our chat window for immediate response. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2021-01-21

Hi, I like to incorporate this device into a system that's controlled by a set python code. Do you have the class to communicate and commands to read temperature and humidity? Thanks, John

Asked by: jlirongxian
Thank you for your inquiry. Commands can be found here: ftp://ftp.omega.com/public/DASGroup/products/RH-USB/
Answered by: CB Engineer
Date published: 2021-09-08
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Wall/duct mounting kit
4 In Stock

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