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Six Channel Handheld Rechargeable Temperature Data Logger

Six Channel Handheld Temperature Data Logger and Built-In Rechargeable Battery



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Six Channel Handheld Temperature Data Logger and Built-In Rechargeable Battery RDXL6SD-USB RDXL6SD-USB
  • Four Thermocouple Inputs and Two Pt100 RTD Inputs
  • Display and Log All 6 Channels Simultaneously or Individually
  • USB Interface with Free Software
  • MODBUS Protocol for Integration Into 3rd Party Software

RDXL6SD-USB Model Options

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Additional Feature
Measurement Type
Number of Measurements
Input Type
Maximum Samples
Data Interface
Max Sampling Rate

The RDXL6SD-USB is a six-channel touch screen data logger that accepts four thermocouple and two RTD inputs. Each channel has individually configurable HI/LO alarms. The intuitive touch screen interface allows each channel to be configured separately for input type, math, alarm, and display options. All six channels can be displayed and logged simultaneously or individually. Data can be logged as fast as once a second and is stored on the included 4 GB SD card in Excel compatible format.

Inputs: 4x thermocouple inputs for use with miniature thermocouple connectors, and 2 x spring clamp terminals for 2 or 3-wire RTDs, 28 to 16 AWG
Input Temperature Range:
    Type J: -200 to 1200°C
    Type K: -200 to 1372°C
    Type T: -200 to 400°C
    Type R: 0 to 1768°C
    Type S: 0 to 1768°C
    Type N: 0 to 1300°C
    Type E: -200 to 1000°C
    RTD: -200 to 850°C
Temperature Accuracy:
    For Thermocouples: ±0.1% or 0.8°C
    For RTD: ±1.0% or 1.0°C
Temperature Resolution: 0.1° for temperatures below 1000°C or °F, 1° for temperatures above 1000°C or °F
Display: 72 mm (2.83") resistive touch TFT, 320 x 240 pixels, backlit
Configurable Parameters: Temperature units, alarms, signal processing, date and time, data logging, power options, graph channels
Temperature Units: °F or °C
Alarm Configuration: 12 x alarms (2 per channel) with adjustable level, individually configurable as HI or LO
Signal Processing: Average, minimum, maximum, standard deviation, 2-channel temperature difference
Display Response Time: 1 second
Operating Temperature: 0 to 50°C (32 to 122°F)
Power Supplies: Built-in rechargeable battery, USB, or 5 Vdc adaptor (included)
Battery Life: 32 hour logging with full display brightness; up to 96 hours while logging in power saving mode
Weight: 200 g (7 oz) without thermocouples
Dimensions: 136 W x 71 H x 32 D mm (5.35 x 2.8 x 1.25")
Data Logging Specifications
Data Logging Interval: 1 to 86,400 seconds (1 day)
Maximum SD Card Capacity: 32 GB SD Card (4 GB included)
Variables Logged: Measured temperature, cold junction temperature, alarm events
File Format: .csv (can be imported to Excel)
Configurable Parameters: Sample period, number of samples, scheduled start date and time
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Rated 4 out of 5 by from Decent We bought a couple of these, they do a good job of logging data. The graph is not super usable at least in firmware version 1.01. When the temperature is set to Fahrenheit it the graph displays it as 32° lower than it actually is. The graph also really needs a zoom feature that can be either dynamic or user controlled. Right now you can change how many seconds per graph pixel but if you change it it erases everything already on the graph. You can kind of scroll through the graph but this is rather buggy. It would also be great if we could put it into a mode where it logs voltage and resistance directly. Looking at the literature I was under the impression that the RTD would only work for PT100 sensors but in the settings it can be configured for PR200 500 and 1000 as well which I wish I had realized before ordering my sensors. It logs directly onto an included full sized SD card as a CSV file which is well formatted for excel to understand along with timestamps. If you pull the SD card while logging and then re-insert it it will continue logging but will not fill in any data points from the time the card was out. It would be nice if the SD card had a cover over it to prevent you from accidentally popping the card out. The SD card cannot be read from USB, instead a USB serial bridge get's installed that has a few mod-bus instructions allowing you to poll the device for data (including the raw voltage and resistance values) you cannot access any logged values you can only get values in real time. If you plug in or unplug the power the unit continuities working without missing a beat (unlike the HH306A and it's ilk that irrevocably erases all data every time you look at the power connector even though it has a battery and can operate under battery) It comes with a kickstand that feels like it will break soon. I wish it had a tripod mount instead.
Date published: 2018-10-23
Rated 4 out of 5 by from Works great for what it is This is a handy little tool for recording TC's in spots where you don't have any power, just make sure you have fresh batteries in it. Although it has 6 inputs you can only use TC's in 4 of them. You have to have a SD card reader to extract the data as you can't read the logged over a USB cord form the device. The csv file is great for importing into excel and graphing.
Date published: 2019-09-27
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The specs online state Spring Clamps for RTD channel 5 and 6, but one of the two user manuals show a stereo 3.5 mm connector. Can you please confirm the connector type?

Asked by: Pitch9
The RDXLSD-USB uses spring clamp terminals the older RDXLSD used the 3.5mm stereo connectors.
Answered by: Applications Engineer ANB
Date published: 2023-06-21

Can the touch screen be replaced

Asked by: Big Jim
Thank you for your inquiry. The touch screen cannot be replaced. A new unit would be required.
Answered by: Application Engineer CB
Date published: 2023-09-05

Are the channels isolated?

Asked by: R123
The channels are not isolated and when measuring conductive material we suggest using ungrounded thermocouples.
Answered by: ApplicationsEngineerANB
Date published: 2021-04-06

Hello, I am trying to use port 5 and 6 and having no luck. (It says you can use two wire PT 100 wire) so I am trying with K type thermocouple wire. should this work? Is PT and thermocouple the same. Please advise great magical one lol thanks

Asked by: LaserMan
Thank you for your inquiry. This model accepts four thermocouple inputs for ports 1 through 4 only, and 2 PT 100 RTD inputs for ports 5 and 6 only. PT 100 RTD sensors are not the same as type K thermocouples. We offer a wide range of PT 100 RTD sensors for you to select from from our website.
Answered by: Application Engineer JB
Date published: 2020-06-10

I'm trying to get information on Modbus communication with this unit and am not having much luck. The communications link in this manual ( ) does not work. Can you point me in the right direction?

Asked by: Temperature_user
Thank you for your inquire This information will need to be answered by are engineers directly to discuss in detail please contact them at
Answered by: application engineer je
Date published: 2020-04-24

How often do I need to calibrate this logger?

Asked by: Phil Zhou
Omega recommends calibration at least once per year and more if used in a critical application.
Answered by: Applications Engineer AB
Date published: 2023-02-06

I am having a problem figuring out the Data logging.   I put the thermal couple in oven.  And hit the start button.   But when I stop it and hook it up to the computer there is no files to view.    What can cause this ?  I’m guessing a human error.  

Asked by: Laser guy
The Data is stored on the SD Card which you remove and download into the SW and when you use the USB cable it is a live connection directly to the SW on your computer. If you still have questions contact the temperature group at
Answered by: Applications Engineer AB
Date published: 2021-07-16

is it possible to display live data to laptop? do you have any laptop software to display live data?

Asked by: Muzahid
Hello, thank you for your question. The free software in the product page can be used to display live data, change settings, and log data. Alternatively, if you want to integrate into your own software, you can use the Modbus over USB interface instead.
Answered by: DA Engineer
Date published: 2020-07-08

I am looking for a similar unit to pass through a continuous oven of up to 400F. Do you have a one with an appropriate shielding case? Time at temp is less than 30 minutes, say 60 minutes absolute worst case. Also, I need to measure product temp not air.

Asked by: Johnny111
Thank you for your question. Unfortunately, we do not carry the item you are looking for at this time. Maybe in the future.
Answered by: Eagle
Date published: 2021-03-26

What is CAL-3?

Asked by: bbrad
Thank you for the inquiry. CAL-3 is for the optional NIST traceable calibration certificate. This is a comparison of meter readings against our lab reference standards. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2023-04-09
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