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  • multi port input data acquisition
  • WLAN capable multichannel datalogger

GL840-M Multi-Channel Standalone Datalogger


Product Description

new-icon-instruments-store.png GL840 is Graphtec's newest Multichannel Standalone Data Logger

GL840 Comes Standard with:

  • WLAN capable using optional* WLAN Unit B-568 for remote monitoring and datalogging
  • 7 inch wide TFT color LCD screen
  • Three types of power source: AC, DC*, rechargeable battery pack*
  • Extended memory capacity using SD cards (SDHC compatible up to 32GB*)
  • Max sampling interval up to 10ms
  • Expandable up to 200 channels
  • Access GL100 sensors and adapters
  • Flexible input system for applications such as RTD, T/C, humidity and more
  • Smartphone, remote access monitoring smart phone device remote datalogging

*Optional accessories not included

 ***All units include standard manufacturer’s certificate for factory calibration***

Two separate GL840 models available


Max Sampling Interval of up to 10ms

GL840 series carries two SD memory card slots
SDHC up to 32 GB supported. Captured data can be stored in GBD (Graphtec Binary Data) or CSV file format.
Capturing time* (when all 20 analog channels are being used with Logic/Pulse inputs turned off).

*Figures are approximate. File size of captured data is 2GB in GBD or CSV file format on this chart. Sampling interval is limited by the number of channels in use (10ms:1ch, 50ms:5ch, 100ms:10ch). Limited sampling speed is available when digital sensors and GL100-WL are used as a remote monitoring device.


data logging acquisition wlan wifi



Full Specifications Datasheet: Download GL840 Datasheet pdf

GL840 User Manual: Download GL840 User Manual pdf

GL840 Sample Data File: Download GL840 Sample Data File  (60 KB zip)
Please utilize this file to sample the GL APS software.

GL840 Terminal Extension Blocks Information: Download GL840 Terminal Extension Blocks Information pdf


The GL840 is a comprehensive multichannel data logger and the best value market leader. This compact, various signal input datalogger accepts voltage, temperature, humidity, pulse, logic signals and more!

Application Industries Benefiting from data logging with the GL840

  • Agriculture
  • Greenhouse and Hydroponics
  • Construction and Civil engineering
  • Machinery manufacturing
  • Automotive industry
  • Aerospace
  • Utilities / Gas and Electric
  • Electrical appliance and Office equipment
  • Food processing

  ***All units include standard manufacturer’s certificate for factory calibration***

GL840 Comes with one year limited manufacturers warranty. 
Read Complete Limited Warranty Information

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