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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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Lead Time (If not in stock): 9 weeks
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 operating temperature is 0-50 C, what is the max safe temperature that the unit can be exposed to without damage?

Asked by: mschulz
The specification is for 0 to 50C for operation and though not stated most instruments can go +/- 10% when in storage only.
Answered by: Applications Engineer AB
Date published: 2021-06-23

I am attempting to measure temperature from all six channels (four k type thermocouples, two p100) and for some reason when I press "Start Logging" the device freezes then restarts. Any reason why this might be happening? It is plugged in.

Asked by: JHuang
This should not be happening per the user's guide and if it persists contact the Temperature group at or call the main phone number and connect to Temperature.
Answered by: ApplicationsEngineerANB
Date published: 2021-06-09

Does this unit come with a certificate of calibration?

Asked by: chillndan
Thank you for your question. If you require a calibration cert than you would have to order RDXL6SD-USB-CAL-3.
Answered by: Application Engineer PV
Date published: 2022-10-20

Will this model average 4 channels at once and display that average?

Asked by: Scott Y
Thank you for your inquiry! Yes, the RDXL6SD-USB can display the average temperature measurement of 4 channels.
Answered by: Application Engineer CK
Date published: 2021-11-29

Will this logger work with Type B thermocouples?

Asked by: Hartwich
The RDXL6SD-USB will not read a type B thermocouple. It will only read types J, K, T, R, S, N and E thermocouples.
Answered by: Temperature
Date published: 2020-02-18

Details on how to set the alarm settings? Alarm always on when set to "High" regardless of reading or setpoint or if in Auto or manual.

Asked by: Matt123456789
You can call in for temperature technical support or send an email to to evaluate the alarm operation.
Answered by: ApplicationsEngineerANB
Date published: 2021-07-19

For my application, I plan to connect the data logger to my laptop and let it sit for days to collect the data. If the laptop goes to sleep, does the software on the computer and data loggers keep logging the data?

Asked by: jacob88
No, the software will not keep logging if Windows goes to sleep. From the information I can find the PC’s CPU does not run during sleep. However, the RDXL6SD-USB is designed as a standalone data logger. We suggest instead to disconnect the RDXL6SD-USB from the PC, connect the mains power adapter (so the battery does not run out), and log data to the SD card, then transfer the data to the PC afterwards for analysis.
Answered by: ApplicationsEngineerANB
Date published: 2022-11-10

What is the file naming convention? It seems to create a folder w/the create data as the folder name, but inside is a .csv file that looks like DA-XX-YY where XX and YY seem to be random numbers. What is the convention for those file names?

Asked by: L Rolly
Thank you for your inquiry. Please send your questions to
Answered by: Application Engineer JB
Date published: 2020-04-06
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