Overview; Features - GRAPHTEC GL840 User Manual

CHAPTER 1 General Description

1.1 Overview

The GL840 is a compact, lightweight, multi-CH, and multi-purpose data logger with a 7-inch color display.
There are three types of terminal units with 20 channels. By using the expansion terminal base, it is possible
to measure up to 200 channels. In addition, when connecting various modules, the voltage, temperature and
humidity as well as the acceleration, AC current, CO2, and illuminance / ultraviolet etc. can be measured.
The GL840 can save the high-capacity measurement data directly in the internal memory or SD CARD.
For the PC interface, as USB and Ethernet is included as standard, system configuration according to use
is possible. As the Ethernet function is equipped with both WEB server and FTP server functions, remote
supervision and data transfer are also possible. Multipurpose remote measurement can also be performed
by installing an optional wireless unit and using it in combination with a wireless LAN.

1.2 Features

Input
•
Adoption of a pluggable M3 screw type or screwless type input terminal facilitates wiring.
•
Up to 200 channels can be connected using the expansion terminal base and the terminal unit with 20
channels.
•
When using the Graphtec's GS series and terminal / adapter, the acceleration, AC current, CO2, and
illuminance / ultraviolet measurements are also possible.
•
Because that the terminals of all terminal units have a whole CH isolated, the different standard signals
can be measured at the same time.
In addition, when using the withstand high-voltage high-precision terminal, you can measure in the
environmental conditions of high withstand voltage.
Display & Operation
•
With the GL840's high-resolution 7-inch TFT color liquid crystal display, you can confirm the waveforms of
measured data and each channel's settings at a glance.
•
Easy operation is achieved through a straightforward menu structure and key allocation which resembles
mobile phones.
Data Capture
•
The high-capacity measurement data can be saved directly in the internal memory or SD CARD.
•
Because the SD CARD is used as an external memory, you can measure a long period of time with peace
of mind while data backup.
* When the optional wireless unit is installed, the SD CARD cannot be inserted into the SD CARD2 slot.
•
Because disk image can be used for the internal memory, multiple data can be saved.
•
The new ring memory capture function maintains latest data even after capturing for a long term. (You
need to set how long you want to keep data.)
•
For voltage, temperature and humidity measurements, data can be captured at sampling rates of up to
10 msec per channel by using fewer measuring channels. (Temperature measurement can be done at
sampling rates of 100 msec and higher.)
•
The GL840 is equipped with the relay recording function, and 2GByte or more data can be saved by
switching the to the other file without data missing. (When the capacity of one file reaches 2000MB, the
file is switched.)
1-2