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RH-USB-Series
USB Temperature & Humidity Sensor with Datalogging Software
- 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
RH-USB-Series
From
$
340.87
Product Overview
- Data Interface Note USB Cable: Integral to sensor, 2 m (6') (shielded) Type A plug
- Diameter 16 mm
- Form factor Handheld
- Length 138 mm
- Materials 316 Stainless Steel
- Measurement Type Humidity, Temperature
- Relative Humidity Accuracy ± 3% RH
- Relative Humidity Accuracy Note ± 3% RH (@ 15 to 90% RH)
- Relative Humidity, Max 0.98
- Relative Humidity, Min 2%
- Repeatability ± 1% RH
- Series ID RH-USB-Series
- Software Compatibility Requires Windows® XP, Vista (32bit or 64bit), or Windows 7 (32bit or 64bit) operating system
- Temperature Accuracy ± 1.0°C
- Temperature Measurement, Max 49 °C
- Temperature Measurement, Min -17 °C
- Weight 67 g
Supported Applications
The Omega RH-USB Series is a USB Temperature & Humidity Sensor with Datalogging Software designed for direct connection to a PC. The series includes the RH-USB model, which measures relative humidity and temperature. According to the product overview, these devices are intended to turn a PC into a data logger using free software.
Explicit usage restrictions state that this device is not designed for use in medical or nuclear applications. Additionally, do not operate this device in flammable or explosive environments.
Operating Conditions & Performance
The RH-USB sensor features a stainless steel housing and connects via USB to provide output signals directly to the host computer. The overall length of the RH-USB unit is 131 mm (5.18 in).
Detailed technical specifications such as measurement ranges, accuracy values, resolution, response time, or operating temperature limits are not provided for the RH-USB model beyond general descriptions in the source documentation.
Configuration Options
The series supports a direct USB electrical connection. The housing material for the RH-USB is stainless steel. While other models within the broader Omega USB family (such as TJ-USB, UTC-USB, PX409-USB, and IR-USB) offer different measurement types including thermocouple temperature, universal thermocouple conversion, pressure transduction, and infrared sensing, these capabilities are specific to their respective model numbers.
Accessories listed for the broader USB family include:
- Laser Sighting Accessory (OS100-LS)
- Mounting Bracket (OS100-MB)
- Water Cooling Jacket (OS100-WC)
- Air Purge Collar (OS100-AP)
The series complies with worldwide safety and EMI/EMC regulations. Certification to European New Approach Directives is being pursued.
Key Product Differences
The Omega USB Series encompasses multiple distinct measurement technologies under a single family manual, though the RH-USB-Series specifically addresses temperature and relative humidity sensing via USB. Other models in the broader product overview include:
- TJ-USB: Type-K Thermocouple (overall length 914.4 mm / 36.0 in; stem lengths of 457.18 mm / 18.0 in or 609.6 mm / 24.0 in)
- UTC-USB: Universal Thermocouple Connector/Converter
- PX409-USB: Pressure Transducer (wetted material: 316L stainless steel)
- IR-USB: Infrared Temperature Sensor
The RH-USB is distinguished by its specific measurement of relative humidity and temperature, whereas the other models serve different sensing functions. Dimensions for UTC-USB, PX409-USB, and IR-USB are not specified in the provided documentation.
PDFs & Manuals
Software & Drivers
Show Ratings & Reviews
Rated 5 out of
5
by
BlairH 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
Martin33 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
jake 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
How can I connect my own software to the sensor? Do you provide a list of commands that can be sent via Serial communication?
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.
Date published: 2019-07-29
Is this require to be calibrated annually?
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.
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?
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
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.
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.
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?
Thank you for the inquiry. This sensor is not rated for pressure. It would leak through.
Best regards
OMEGA
Date published: 2022-02-21
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?
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.
Date published: 2021-03-23
Can I use this sensor with a Linux based system such as CentOS as well as Python to access and obtain readings?
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM”
Date published: 2022-04-14
The “RH_USB Command Reference.doc” indicates how to send a command to request the model number and firmware version but doesn’t give a command for Serial Number. What command is used to request the RH-USB instrument serial number?
Thank you for your question. Unfortunately, there is no command for serial number.
Date published: 2023-01-19