Materials Testing
    10 Channel Portable Data Logger

10 Channel Portable Data Logger

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Why buy from Geneq? - find out more

Versatility and performance without sacrificing accurate, verifiable measurements. Increase your productivity and save cost.

  • USB , Wireless, LAN
  • Isolated universal input, standalone 10-ch- input
  • Direct CSV / Excel recording
  • Max Sampling Interval 10 MS
  • Built-in 4 GB flash flash memory with SD card
  • Compatible Windows, IOS, Android
  • Combined measurements of:
    • Voltage
    • Temperature
    • Humidity
    • Pulse
    • Logic Signals

GL240 is a 10 channel comprehensive data logger and the best value market leader. This compact, comprehensive datalogger accepts voltage, temperature, humidity, pulse and logic signals. Channel-to-channel isolation means wiring errors or overloaded channels do not affect neighboring channels and we focus our effort on providing you accurate data you can count on. 

Graphtec GL240 Comes Standard with:

  • 4.3 inch wide TFT color LCD screen
  • Three types of power source: AC, DC (B-514)*, rechargeable battery pack (B-569)*
  • Extended memory capacity using SD cards (SDHC compatible up to 32GB)*
  • Max sampling interval up to 10ms/1 ch.  100ms for all 10 channels
  • All channels isolated
  • Alarm output ports up to 4 channels
  • Logic/Pulse signal input port up to 4 channels
  • Flexible input system for voltage, temp, humidity, pulse and logic signals
  • Smartphone, remote access monitoring capability
  • Wireless LAN using optional* WLAN Unit B-568 for remote monitoring and datalogging

*Optional accessories not included

Application Industries 

  • Aftermarket Automotive Tuning
  • Agriculture and Food Manufacturing
  • Greenhouse and Hydroponics
  • Construction and Civil engineering
  • Machinery Manufacturing
  • Automotive Industry
  • Aerospace and Military Industry
  • Utilities / Gas and Electric
  • Battery Manufacturing
  • Electrical Appliance and Office Equipment
  • Electrical Service and Maintenance Companies
  • Food Processing
  • Rail Transportation
  • Raw Materials and Components Manufacturing
  • Research and Development

Wireless Measurement Using Wireless LAN (optional)

Wireless LAN option enables the wireless communication with other device.  When GL240 is set as a station, PC and smart devices can access the GL240 directly using the Wireless LAN module.  B-568 wireless module option is required.

Combining GL100-WL and GL240

GL100-WL can now be connected to the GL240 as a remote sensor using the WLAN feature.  GL240 supports 1 unit of the GL100-WL, with real time recording.  The measured value from the GL100-WL will appear on the GL240 display wirelessly and records in a single file along with the measurement value from the GL240 main inputs.  Additional measurements for acceleration/vibration, CO2, light/UV, temp, humidity, and AC current can be wirelessly monitored.

All Channel Isolated/Universal Input

Channel to Channel isolation is the highlight of the Graphtec dataloggers.  Along with its compact footprint, GL240 contains an isolated input system which ensures that signals are not corrupted by inputs from other channels.

Maximum Sampling Interval of Up To 10ms

Provides faster sampling rate of 10ms for a single channel voltage measurement.  Simultaneous scanning feature allows up to 100 ms when measuring all 10-channels.  

Built-In 4GB Flash Memory with SD Card Support

The new GL series enables reliable long term measurment with its built-in 4GB flash memory and SD card slot for external storage devices.

Useful Functions

Various functions, such as a bar chart data display, alarm output function, and networking features, are available in the GL240 to assist convenient and helpful features for additional data logging capability.

Number of analog input channels10 channels
External input/
output *1
Input *2Trigger or Sampling (1 channel),Logic/Pulse (4 channels)
Output *3Alarm (4 channels)
Sampling interval10 ms to 1 hour (10ms to 50ms: voltage only) *4, External signal
Time scale of waveform display1sec. to 24 hour /division
Alarm function
Trigger actionStart or stop capturing data by the trigger
Repeat actionOff, On (auto rearmed)
Trigger sourceStart: Off, Measured signal, Alarm, External, Clock, Week or Time
Stop: Off, Measured signal, Alarm, External, Clock, Week or Time
Condition SettingCombination: OR or AND
Analog signal: Rising (High),Falling (Low),Window-in, Window-out
Logic signal: Pattern (combination of each input signal in high or low)
Pulse (number of count): Rising (High),Falling (Low),Window-in, Window-out
Alarm outputOutputs a signal when alarm condition occurs in the input signal *5
Pulse input
Rotation count
Counts the number of pulses per sampling interval and converts to rpm
(rotations per minute),Number of pulses for one rotation may be set to
50, 500, 5000, 50k, 500k, 5M, 50M, 500M rpm/F.S. (rpm./Full Scale)
Accumulates the number of pulses from the start of measurement
50, 500, 5000, 50k, 500k, 5M, 50M, 500M C/F.S. (Counts/Full Scale)
Instant countCounts the number of pulses per sampling interval
50, 500, 5000, 50k, 500k, 5M, 50M, 500M C/F.S. (Counts/Full Scale)
Between channelsAddition, Subtraction, Multiplication, and Division for analog input
StatisticalSelect two calculations from Average, Peak, Maximum, Minimum, RMS
Search functionSearch for analog signal levels, values of logic or pulse or alarm point
in captured data
Interface to PCUSB (Hi-speed),WLAN (using B-568 option)
InternalBuilt-in 4GB Flash Memory *6
ExternalOne SD card slot (Support SDHC memory card, up to 32GB) *7
Saved contentsCaptured data, Setting conditions, Screen copy
Capturing modeMode: Normal, Ring, Relay
Ring: Saves most recent data (Number of captured data: 1000 to 2000000 points) *8
Relay: Saves data to multiple files without losing data until data capturing is stopped
Replay DataReplays captured data that was saved in the GL240 (in GBD or CSV format)
Scaling (Engineering unit) functionMeasured value can be converted to the specified engineering unit
• Analog voltage: Converts using four reference points (gain, offset)
• Temperature: Converts using two reference points (offset)
• Pulse count: Converts using two reference points (gain)
Action during data capture• Displaying parst data (using dual display mode (Current + Past data))
• Hot-swapping the SD memory card
• Saving data in between cursors
DisplaySize4.3-inch TFT color LCD (WQVGA: 480 x 272 dots)
LanguageEnglish, French, German, Chinese, Korean, Russian, Spanish, Japanese
Information *9Waveform in Y-T with digital values, Waveform only, Digital value, Digital values
and statistics values
Operating environment0 to 45 ºC, 5 to 85 % RH (non condensed)
(When operating with battery pack 0 to 40 ºC, charging battery 15 to 35 ºC)
Power sourceAC adapter100 to 240 V AC, 50/60 Hz (1 pc of adapter is attached as standard accessory)
DC power8.5 to 24 V DC (DC drive cable (option B-514) is required)
Battery packMountable battery pack (battery pack (option B-569): 7.2V DC, 2900mAh)
Power consumption *10Max. 36 VA
External dimensions (W x D x H)Approx.188 x 117 x 42 mm (Excluding projections)
Weight *11500 g

*1. Input/Output cable for GL (option B-513) is required to connect logic / pulse signal.

*2. Input signal;

  • Voltage range: Up to 24V (common ground) 
  • Signal type: Voltage, Open collector, Contact (relay) 
  • Threshold: Approx. + 2.5 V (Hysteresis: Approx. 0.5V (2.5V to 3V)) 

*3. Output signal: Open collector (pull-up to 5V by 10kΩ resistor) <Maximum rating of the output transistor> 

  • Voltage: Max. 30V
  • Current: Max. 0.5A
  • Collector dissipation: Max. 0.2W 

*4. Minimum interval varies by number of channels used.

*5. Output port can be specified in each input channel.

*6. The built-in Flash memory is available for units with serial numbers C6043XXX or later. Please contact your local representative for more information.

*7. SD memory card cannot be used on SD card slot while the wireless LAN unit (opton B-568) is used.

*8. Size of the capture data will be limited to 1/3 of available memory.

*9. Display mode is switched every time the dedicated key is pressed. In magnified digital value mode, the displayed channel number can be specified. In the waveform display mode, the changing of the time scale will be effective from the point of the next displayed data.

*10. Rating under maximum power consumption using the AC adapter, with LCD display on, and battery pack being

*11. Excludes AC adapter and battery pack.

Model numberB-568
Supported GL seriesGL840, GL240
Communication methodWireless communication (using radio waves in the 2.4GHz band)
Supported WLAN systemIEEE802.11b/g/n
WPS: Push button or PIN method
Security protocols: WEP64, WEP128, WPA-PSK/WPA2-PSK, AKIP/AES
Communication distance: Approx. 40m (depending on the conditions of radio
Installed locationAttaches to the SD card slot on GL840 / GL240 *7
FunctionAccess Point mode: Communicate with the GL100-WL as a remote sensor
(captured data in the GL100-WL is transferred to GL840/GL240)
Station mode: Communicate with PC or Smart device (control GL840/GL240 and
transfer the data from GL840/GL240)
Connected number of GL100-WLGL840: Up to 5 units of the GL100-WL
GL240: 1 unit of the GL100-WL
Input methodAll channels isolated balanced input *12, Scans channels for sampling
Type of input terminalScrew terminal (M3 screw)
Voltage20, 50, 100, 200, 500 mV, 1, 2, 5, 10, 20, 50, 100 V, and 1-5V F.S. (Full Scale)
ThermocoupleType: K, J, E, T, R, S, B, N, and W (WRe5-26)
Humidity0 to 100 % RH - using the humidity sensor (option B-530)
FilterOff, 2, 5, 10, 20, 40 (moving average in selected number)
accuracy *13
Voltage± 0.1% of F.S. (Full Scale)
TypeMeasurement range
(TS: Temp Sense)
Measurement accuracy
R0 ≤ TS ≤ 100 ºC± 5.2 ºC
100 < TS ≤ 300 ºC± 3.0 ºC
300 < TS ≤ 1600 ºC± (0.05% of rdg. + 2.0 ºC)
S0 ≤ TS ≤ 100 ºC± 5.2 ºC
100 < TS ≤ 300 ºC± 3.0 ºC
300 < TS ≤ 1760 ºC± (0.05% of rdg. + 2.0 ºC)
B400 ≤ TS ≤ 600 ºC± 3.5 ºC
600 < TS ≤ 1820 ºC± (0.05% of rdg. + 2.0 ºC)
K-200 ≤ TS ≤ -100 ºC± (0.05% of rdg. + 2.0 ºC)
-100 < TS ≤ 1370 ºC± (0.05% of rdg. + 1.0 ºC)
E-200 ≤ TS ≤ -100 ºC± (0.05% of rdg. + 2.0 ºC)
-100 < TS ≤ 800 ºC± (0.05% of rdg. + 1.0 ºC)
T-200 ≤ TS ≤ -100 ºC± (0.1% of rdg. + 1.5 ºC)
-100 < TS ≤ 400 ºC± (0.1% of rdg. + 0.5 ºC)
J-200 ≤ TS ≤ -100 ºC± 2.7 ºC
-100 < TS ≤ 100 ºC± 1.7 ºC
100 < TS ≤ 1100 ºC± (0.05% of rdg. + 1.0 ºC)
N-200 ≤ TS < 0 ºC± (0.1% of rdg. + 2.0 ºC)
0 ≤ TS ≤ 1300 ºC± (0.1% of rdg. + 1.0 ºC)
W0 ≤ TS ≤ 2000 ºC± (0.1% of rdg. + 1.5 ºC)
R.J.C.± 0.5 ºC
A/D converterSigma-Delta type, 16 bits (effective resolution: 1/40000 of the measuring full range)
input voltage
(+) / (-) terminal
20 mV to 1 V range: 60 Vp-p,
2 V to 100 V range: 110 Vp-p
Channels ((-) / (-))60 Vp-p
Channel / GND60 Vp-p
Max. voltage
Between channels350 Vp-p (1 minute)
Channel / GND350 Vp-p (1 minute)

*12. The terminal "b" for using the RTD is connected each other across all channels.

*13. Subject to the following conditions:

  • Room temperature is 23 oC ± 5 oC. 
  • When 30 minutes or more have elapsed after power was turned on. 
  • Filter is set to 10.
  • Sampling rate is set to 1 sec, using 10-channel. 
  • GND terminal is connected to ground. 

*14. Wire size of thermocouple used is 0.32mm diameter in the T or K type and 0.65mm diameter in other types.