standalone high voltage data logger

Multi-Channel Datalogger GL840

multi-channel WLAN datalogger  


remote high voltage monitoring
 GL840-M (Multi-Input Unit)  GL840-WV (Withstand High Voltage Unit)

monitoring high voltage datalogging
withstand high voltage datalogger
*Accuracy rating for K-type thermocouple at 100º C includes reference junction compensation. Accuracy varies by the temp levels and thermocouple types.

  GL840 Terminal Extension Blocks Information Guide   1 MB

GL840 Models Come 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
  • *Optional accessories not included

    datalogging fast sampling rates

    GL840 series carries two SD memory card slots. SDHC up to 32GB supported. Captured data can be stored in GBD (Graphtec Binary Data) or CSV file format.
    SD SDHC datalogger
    *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.


    datalogging various input signals
    Analog signal input, Logic/Pulse and digital sensor port can be simultaneously connected to monitor a variety of measurements.
    WLAN remote data logger instrument


    GL100 digital sensor input port


    The GL840 multi-channel datalogger allows users to switch sensors and terminals for measuring various signals.

    Digital sensors and input terminal, adapters of the GL100 connect directly to the GL840.

    WLAN modular datalogger

    Dual port adapter connects up to two sensors for simultaneous interface

    GL840 (configuration example) shown with dual port adapter (GS-DPA), CO2 sensor & illuminance/UV sensorWLAN remote triggering data acquisition datalogger


    Available sensors/terminals to measure various signals with the GL840 datalogger.

    illuminance and UV sensor monitoring recording   Temperature Humidity climate monitoring datalogger  


    portable remote CO2 sensor monitor   AC Current Sensor Adapter for data monitoring  


    AC Current Sensor Adapter for dataloggerAC Current Sensos 50v 100v 200v


    Available input terminals and adapters for GL100

    portable compact 4channel voltage temperature terminal   multi-channel AC Current Sensor data logging monitor



    wireless wifi datalogging remotely

    GL840 is WLAN ready with optional WLAN Unit B-568

    Wireless LAN option enables wireless communication with other devices. Connects to the GL100-WL remotely when the GL840 is set as an access point. When the GL840 is set as a station, PCs and smart devices will be able to access the WLAN enabled GL840 directly.
    datalogger with wireless LAN

    Combine GL840 and GL100-WL

    You can expand your measurement variety by adding the sensors available on the GL100-WL unit.
    The measured value by GL100-WL will appear in a single file along with the measurement value from the GL840 main inputs. GL840 will now take in direct information from the GL100-WL units. GL840 supports up to five units of the GL100-WL.
    wi-fi remote triggering monitor instrument
    GL840 can use up to five units of GL100-WL as its remote sensor


    wireless wifi datalogging remotely
    remote monitor datalogging via smartphone tablet


    wireless wifi datalogging remotely
    remote monitor datalogging via smartphone tablet


    wireless wifi datalogging remotely
    remote data acuisition smartphone tablet


    Advantageous Functions & Features


    FTP Client Function: Captured data is periodically transferred to the FTP server for backup.
    NTP Client Function: The clock on the GL840 is periodically synchronized with the NTP server.
    (The GL840 requires connection to a LAN environment using the Ehternet/WLAN ports for networking functions)



    datalogging various input signals
    datalogger application software

    GL-Connect for Android & iOS
    Supports GL840/GL100

    iOS7 / iOS8
    Datalogger Apple App store software application

    Andorid (4.1-4.4)
    Android software app for datalogging



      Download GL840 User Manual   22.5 MB

      Download GL840 Series Brochure/Spec Sheet   7.3 MB

      GL840 Terminal Extension Blocks Information Guide   1 MB

      Shop for GL840 Series Datalogger

      GL840 Pelican Hard Case Now Available

      Contact Graphtec Instruments Sales Team For Dealers

    Go Back to Instruments Main Page

    illuminance and UV sensor monitoring recording Compact CO2 Sensor attachment Compact Portable AC Current Adapter 50v 100v 200v remote AC Terminal Adapter monitoring portable handheld 4ch voltage temperature data monitor environmental climate temperature humidity monitoring