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Main features


Three types of input system enable to measure various phenomena

Input system 1 : Multifunction analog input ports

Contains a highly isolated input system which ensures that signals are not corrupted by noise from other channels. The GL840`s inputs are suitable for combined measurements from voltage,temperature,humidity, logic, and pulse signals.
The standard configuration has 20 analog input channels. It is expandable to 200 channels by adding optional 20 channels extension terminal base unit(B-566) and input terminal units(B-564 or B-565).

Withstand voltage & Accuracy Multi-input type (B-564) Withstand-voltage type (B-565)
Voltage Input voltage range 20 mV to 100V 20mV to 100V
Max. voltage (Input - GND) 60 Vp-p 300 Vp-p
Temp. Thermocouple R, S, B, K, E, T, J, N, W (WRe5-26)
RTD (Resistance Temp. Detector) Pt100 (IEC751), JPt100 (JIS), Pt1000 (IEC751)
Accuracy Voltage ± 0.1% of F.S. ±(0.05% of FS + 10μV)
Temperature* ± 1.55 ºC ± 1.1 ºC
* Accuracy rating for K-type thermocouple at 100˚C includes reference junction compensation. Accuracy varies by the temperature levels and thermocouple types.

The following shows how a standard configuration is expanded to more than 40 channels

Configuration for additional channels

Number of channels 20 channels 40 channels 100 channels 200 channels
GL840 unit (GL840-M or GL840-WV) 1 set 1 set 1 set 1 set
Connection cable(B-567-05 or -20) N/A 1 pc 1 pc 1 pc
Terminal base (B-566) N/A 2 sets 5 sets 10 sets
Input terminal (B-564 or B-565 ) N/A 1 set 4 sets 9 sets

Offers longer cable for the input terminals

Input terminal blocks can be connected directly(in daisy chain), or using the B-565 cable(s). This allows the input terminals to be placed in separate locations according to the need of the application.
The input terminal unit and the GL840 main body can be extended by using an extended connections cable.
*If the signal is affected by noise, It may be required to use a slower sampling.

Input system 2 : Support dogotal sensors

Digital sensors and input terminal/adapters for the GL100 connects to the GL840 directly

Input system 3 : 4 channels of Logic/Pulse inputs

Supports 4-channels logic or pulse signal inputs. Pulse mode allows cumulative, instant, or rotational values for industrial measurement capability with speed and flow.

Maximum sampling interval of up to 10ms

Provides faster sampling rates for voltage measurements. You are able to achieve up to 10ms sampling speed when limiting the number of channels in use.

Sampling Interval 10ms 20ms 50ms 100ms 200ms 500ms 1s 2s
Number of channel 1 2 5 10 20 50 100 200
Measuring Voltage
Temperature - - -

Supports large-size SD memory card for reliable long term measurement

New GL840 series carries two SD memory card slots for storage device. The SDHC type SD memory card is supported up to 32GB. 4GB SD memory card comes as a standard accessory installed in the first slot. the captured data can be stored in GBD(Graphtec binary data) or CSV file format.

Sampling 10ms 50ms 100ms 200ms 500ms 1s 10s

GBD format

31 days 77 days 95 days 108 days 270 days Over 365 Over 365

CSV format

3 days 11 days 16 days 21 days 54 days 109 days Over 365

*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.

Ring capture function

The most recent data is saved when the memory is configured in ring memory mode. (Number of capturing data is 1000 to 2000000 points)

Relay capture function

Data is continuously saved to multiple files up to 2GB without losing any data until capturing is stopped when the memory is configured in the relay mode.

Hot-swapping the SD memory card

SD card can be replaced during data capturing when the sampling interval is 100ms or slower.

Useful functions Alarm


Alarm output function

Based on set conditions for each channels, alarm signal can be placed using the four channel alrm out put ports.*
*Input/Output cable(B-513 option) is required to connect the alrm output ports to external buzzer/light mechanism.

USB drive mode

USB drive mode function enables data to be transferred to the PC from GL240 by drag&drop feature.

Navigation function

Simple to use navigation screen allows setting operatin for measurement and wireless LAN adapter.

Large easy-to-read 7-inch wide color LCD

Carries a clear 7-inch wide TFT color LCD screen (WVGA:800x480 dots) for the GL840. Monitoring data are displayed in waveform or digital form option. Parameter settings can be displayed on the screen.

3 Types of power source

Choose from AC power supply, DC supply* or the rechargeable battery pack.*
*DC power drive cable(B-514) and battery pack(B-569) are optional accessories.

Networking features

WEB&FTP server function
GL240 can be controlled externally via a network on the WEB browser, which also supports monitoring and transfer of signals and captured data. FTP client function Captured data is periodically transferred to the FTP server for backup. NTP client function The clock on the GL240 is periodically synchronized with the NTP server. *The GL240 needs to be connected to a LAN enviroment using the available WLAN ports for above functions.