Model GL840 and GL820 Data Logger Comparison

The GL840 Data Logger will replace model GL820. The primary differences offer only performance advantages. Those advantages are highlighted in the chart that follows. As always, please contact us with any questions.

  GL820 Data Logger GL840 Data Logger  
Feature GL820 GL840 Comments
Display size and resolution 5.7-inch, 640×480 pixels 7-inch, 800×480 pixels  
Dual SD memory ports No Yes  
Wireless option No Yes consumes one of two SD slots
100 V range 50 V max Yes  
300 V common mode voltage No Yes Requires GL840-WV
Included memory 2GB 4GB consumes one of two SD slots (2 GB max file size)
Relay capture mode No Yes Record automatically to sequential files
SD card hot swap No Yes  
GL100-WL support No Yes supports up to 5 units
Digital sensor support No Yes Connect wirelessly via GL100-WL or to a reserved port
Remote monitoring/configuration No Yes via Ethernet, USB, or wireless option
App support No Yes via Ethernet, USB, or wireless option