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Graphtec GL240 10 Channels 4.3" Color Display Data Logger

Graphtec GL240
5 of 5
Data logger with 4.3" color display, with 10 channels, 4GB Internal Flash memory with additional SD card slot (max 32GB SDHC), 16-bit resolution, high isolation per channel (125 VAC RMS and 350 VDC channel-to-chassis), Up to 110Vp-p between (+) and (-). Includes Application CD, StartUp Manual, AC/DC Supply.


  • 10 analog input channels
  • Programmable per channel
  • ±20 mV to ±100 V over 12 ranges
  • Supports direct-connected thermocouples of any type
  • Full isolation per channel
  • 4 discrete input channels
  • Programmable as a group as logic or pulse inputs
  • Pulse inputs support counter or frequency inputs
  • 4 discrete alarm outputs
  • Optional WiFi wireless operation 
  • Flexible triggering
  • Built-in, 4.3-inch color display
  • Built-in Web server operation for remote operations
  • Operates either stand-alone or
  • PC-connected.
  • PC-side software included
  • Includes 
    • GL240 Data Logger
    • AC Adapter
    • NIST-Traceable Calibration Certificate
    • Software on CD
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Product Information

Graphtec GL240 10 Channels 4.3" Color Display Data Logger

Graphtec GL240 10 Channels 4.3" Color Display Data Logger

  • Wireless LAN capability | remote monitoring & datalogging
  • Flexible input system for wide array of applications
  • Ability to access additional (GL100) sensors & adapters
  • Extended memory capacity using SD memory card
  • Max sampling interval up to 10ms
  • Smartphone access


Graphtec GL240 is a third-generation data logger product with exceptional price/performance. It’s a 10 analog channel device augmented by four discrete inputs and outputs. Its discrete inputs can be configured as a group to be either logic inputs or pulse inputs. When configured for pulse, each of the four channels can be configured to measure frequency or to count. The four discrete outputs are alarms that can be triggered by a variety of easily-defined analog and pulse/discrete input channel conditions. The 10 GL240 analog input channels may each be configured to measure a direct connected voltage in the range of 20 mV to 100 V full scale across 12 ranges, or for a direct-connected thermocouple of any type to measure temperature. Each of the GL240’s analog input channels is electrically isolated from other channels and from power ground allowing off-ground measurements using shunts, as well as powered or grounded thermocouples.

The most powerful GL240 feature is its triggering flexibility. Data recording can be independently started or stopped as a function of analog and pulse/discrete signal level (single or windowed), alarm, date and time, and day-of-the-week. Triggers can also be configured to operate only once, or to automatically repeat. The ability to of the GL240 to adapt to virtually any desired trigger condition allows the instrument to operate unattended for long periods of time with complete autonomy.

The GL240 operates either connected to a PC or entirely stand-alone. Connection to a PC may be over a standard USB or optional wireless connection. Either connection approach may take advantage of supplied PC-side software to configure, acquire, display, and record digitized information for storage directly to the PC’s HDD. Acquired data may be retrieved for review and analysis after recording, including the ability to export to Microsoft Excel. Using the GL240’s wireless option enables the instrument’s networking features, allowing it to be remotely configured and managed using the standard Web browser of any computer or smart phone. Automatic backup of data acquired to a user-accessible SD memory card is also supported via its FTP facility.

Finally, the measurement reach of a wireless-enabled GL240 is further extended by use of the GL100 accessory. The GL100 wirelessly enables measurements of temperature/humidity, acceleration, CO2, illuminance, ac current, and more.

GL240 Analog Input Circuit and Measurement Ranges

Each of the ten GL240 analog input channels offers isolation between them and ground. That means that a potential difference in the ground of one or more channels relative to each other, or relative to the power ground of the GL240 have little or no effect on measurements when used within spec. The isolation feature provides a tremendous advantage in terms of noise immunity while making typical measurements, and extends the reach of the instrument to include those that can only be made with an isolated configuration, like current shunts and powered and grounded thermocouples.


GL240 Discrete I/O and Pulse Inputs




Depending upon the application, discrete I/O and pulse inputs can play a crucial data logging role. The GL240 supports four discrete alarm outputs that can signal alarm or event states that are a function of virtually any combinations of analog and pulse or discrete input values. These alarm outputs may be used to handshake with a PLC or other devices to start or stop processes or simply signal the beginning or end of events. The GL240 also offers four discrete input ports, which may be configured as simple binary true/false input flags, or for pulse and counter inputs. Pulse inputs can be used to acquire frequency data such as rpm or flow, or reconfigured to acquire count data to derive volume from flow or simply count the number of iterations from a process. Pulse data is neatly folded into acquired analog data so that all measured parameters can be evaluated in the same timeframe during analysis to easily identify cause and effect. A final discrete input is reserved for externally triggering the GL240’s A-D conversion to allow the instrument to synchronize to external processes. Access to all discrete I/O requires the B-513 cable option.

GraphtecGL7-DCO_img1_tn Wireless measurement using wireless LAN (option)

Wireless LAN option enables the wireless communication with other device.When the GL240 is set as a station, PC and smart devices will be able to access the WLAN unit directly.
GraphtecGL7-DCO_img2_tn Combining GL100-WL and GL240

GL100-WL cab now be connected to the GL240 as a remote sensor using the WLAN feature.GL240 supports 1 unit of the GL100-WL.
GraphtecGL7-DCO_img3_tn All channel isolated/Universal input, Standalone Multi-Channel

Its compact size contains an isolated input system which ensures that signals are not corrupted by inputs to other channels.
GraphtecGL7-DCO_img5_tn Maximum sampling interval of up to 10ms

Provides faster sampling rate 10ms for voltage measurement.
GraphtecGL7-DCO_img4_tn Supporting large size SD memory card for reliable long term measurement

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.

What's In The Box

  • GL240 Data Logger
  • AC Adapter
  • NIST-Traceable Calibration Certificate
  • Software on CD
  • Note: Battery Pack is not included (order separately)


Number of analog input channels 10 channels
External input/
output *1
Input *2 Trigger or Sampling (1 channel), Logic/Pulse (4 channels)
Output *3 Alarm (4 channels)
Sampling interval 10 ms to 1 hour (10ms to 50ms: voltage only) *4, External signal
Time scale of waveform display 1sec. to 24 hour /division
Alarm function
Trigger action Start or stop capturing data by the trigger
Repeat action Off, On (auto rearmed)
Trigger source Start: Off, Measured signal, Alarm, External, Clock, Week or Time
Stop: Off, Measured signal, Alarm, External, Clock, Week or Time
Condition Setting Combination: 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 output Outputs 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 count Counts the number of pulses per sampling interval
50, 500, 5000, 50k, 500k, 5M, 50M, 500M C/F.S. (Counts/Full Scale)
Between channels Addition, Subtraction, Multiplication, and Division for analog input
Statistical Select two calculations from Average, Peak, Maximum, Minimum, RMS
Search function Search for analog signal levels, values of logic or pulse or alarm point
in captured data
Interface to PC USB (Hi-speed), WLAN (using B-568 option)
Media 4 GB Internal Memory
SD memory card (Support SDHC, up to 32 GB). Memory card not included
Saved contents Captured data, Setting conditions, Screen copy
Capturing mode Mode: Normal, Ring, Relay
Ring: Saves most recent data (Number of captured data: 1000 to 2000000 points) *7
Relay: Saves data to multiple files without losing data until data capturing is stopped
Replay Data Replays captured data that was saved in the GL240 (in BGD or CSV format)
Scaling (Engineering unit) function Measured 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
Display Size 4.3-inch TFT color LCD (WQVGA: 480 x 272 dots)
Language English, French, German, Chinese, Korean, Russian, Spanish, Japanese
Information *8 Waveform in Y-T with digital values, Waveform only, Digital value, Digital values
and statistics values
Operating environment 0 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 source AC adapter 100 to 240 V AC, 50/60 Hz (1 pc of adapter is attached as standard accessory)
DC power 8.5 to 24 V DC (DC drive cable (option B-514) is required)
Battery pack Mountable battery pack (battery pack (option B-517): 7.2V DC, 2900mAh)
Power consumption *9 Max. 36 VA
External dimensions (W x D x H) Approx.188 x 117 x 42 mm (Excluding projections)
Weight *10 500 g
Input/Output cable for GL (option B-513) is required to connect the signal.
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))
Output signal: Open collector (pull-up to 5V by 10kΩ resistor)
  • Voltage: Max. 30V
  • Current: Max. 0.5A
  • Collector dissipation: Max. 0.2W
Minimum interval varies by number of channels used.
Output port can be specified in each input channel.
Size of the capture data will be limited to 1/3 of available memory.
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.
Rating under maximum power consumption using the AC adapter, with LCD display on, and battery pack being
Excludes AC adapter and battery pack.
Software specifications for PC
Model name GL100_240_840-APS
Supported OS Windows 8.1, 8, 7, Vista (32/64-bit edition)
Supported device GL840 (USB, Ethernet, WLAN), GL240 (USB, WLAN), GL100 (USB, WLAN)
Functions Control the GL series, Real-time data capture, Replay data, and Data format conversion
Supported units & channels Up to 1000 channels total, Up to 4 groups (number of units is limited by model)
Settings control Input condition, Captuering condition, Trigger/Alarm condition, Report, etc.
Capturing data Saved to PC Saves captured data in real time (in GBD binary or CSV format)
Saved to GL unit Saves to the SD memory card (in GBD binary or CSV format)
Displayed information Y-T waveform, Digital values, Report, X-Y graph (specified period of data, data reply only),
Two displays for the current and past data, and Statistical calculation
File operation Converting data format to CSV from GBD binary, merge multiple data files
in the time axis or as an additional channel
Warning function Send e-mail to the specified address when the alarms occur
Statistical calculation Maximum, Minimum, and Avarage during data capturing
Report function Creates the daily or monthly report automatically
Software specifications for Smart device
Model name GL-Connect
Supported OS Android 4.1 to 4.4, iOS 7/8
Supported device GL840 (WLAN), GL240 (WLAN), GL100 (WLAN)
Functions Control the GL series, Display measured data in waveform or digital value
Supported units Up to 10 units
Settings control Start/Stop, Sampling interval
Capturing data Saves captured data in the GL main body (data cannot be saved in the smart device)
Displayed information Data captured in real time by digital value, Replay the data stored in the GL body by the waveform
Wireless LAN unit (option) specifications
Model number B-568
Supported GL series GL840, GL240
Communication method Wireless communication (using radio waves in the 2.4GHz band)
Supported WLAN system IEEE802.11b/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 location Attached to the SD CARD slot number 2 on the GL840/GL240
*When the wireless LAN unit is installed, the SD memory card cannot be used
in slot number 2
Function Access 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-WL GL840: Up to 5 units of the GL100-WL
GL240: 1 unit of the GL100-WL
GL240 Analog input specifications
Input method All channels isolated balanced input *11, Scans channels for sampling
Type of input terminal Screw terminal (M3 screw)
Voltage 20, 50, 100, 200, 500 mV, 1, 2, 5, 10, 20, 50, 100 V, and 1-5V F.S. (Full Scale)
Thermocouple Type: K, J, E, T, R, S, B, N, and W (WRe5-26)
Humidity 0 to 100 % RH - using the humidity sensor (option B-530)
Filter Off, 2, 5, 10, 20, 40 (moving average in selected number)
accuracy *12
Voltage ± 0.1% of F.S. (Full Scale)
Type Measurement range
(TS: Temp Sense)
Measurement accuracy
R 0 ≤ TS ≤ 100 ºC ± 5.2 ºC
100 < TS ≤ 300 ºC ± 3.0 ºC
300 < TS ≤ 1600 ºC ± (0.05% of rdg. + 2.0 ºC)
S 0 ≤ TS ≤ 100 ºC ± 5.2 ºC
100 < TS ≤ 300 ºC ± 3.0 ºC
300 < TS ≤ 1760 ºC ± (0.05% of rdg. + 2.0 ºC)
B 400 ≤ 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)
W 0 ≤ TS ≤ 2000 ºC ± (0.1% of rdg. + 1.5 ºC)
R.J.C. ± 0.5 ºC
A/D converter Sigma-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 / GND 60 Vp-p
Max. voltage
Between channels 350 Vp-p (1 minute)
Channel / GND 350 Vp-p (1 minute)
The terminal "b" for using the RTD is connected each other across all channels.
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.
Wire size of thermocouple used is 0.32mm diameter in the T type and 0.65mm diameter in other types.

Graphtec GL240 Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Dataloggers / Data Acquisition/Data Recorders Template

Type (Recorders) What's This?DAQ System, Data Logger, Videographic 
Style (Recorders)Behind Panel / DIN Rail Mount, Bench / Portable, PC Based 
# Channels Base Unit (Recorders) What's This?10 EA 
Display (Recorders)Built-in, Included w/ Base Unit 
# Logic / Digital Channels (Recorders) What's This?4 channels
Sampling Interval (Controllers/Recorders) What's This?10 ms 
Sampling Frequency (Recorders) What's This?100 S/s (0.0001 MS/S)
Input Types (Controllers/Recorders)Current / 4-20 mA, Digital / Logic / On-Off, Frequency / Pulse, T/C - RTD, Voltage 
Output Types (Controllers/Recorders)Relay 
Bits What's This?16
Power SourceAC Line, Battery, DC Line 
Screen Size4.3 IN 
Special Functions (Recorders)External Trigger, Flow / Speed Totalization, Logic / Ladder / Math, PC Software Available, Software / Visible Alarms
Data storageYes 
Isolated Inputs (Recorders) What's This?Yes
AccuracyVoltage: ±0.1% of Full Scale

Temperature (Thermocouple):
Type K ±(0.05% of rdg. +2.0˚C
Reference Junction Compensation ±0.5˚C

Test Equipment General Attributes

Unique FeaturesWireless Option B-568 module sets the device as terminal node or access point network for 801.11n wireless network.

Engineering Scaling allows ability to read most industrial signals including frequency, tachometer, flow signals, pressures signals, and speed signals.
Warranty1 YEARS
Calibration IncludedNIST Calibration
Power Supply Voltage120V/220V Universal
Safety ApprovalCE, UL
Data Logging What's This?Yes
Interfaces I/O LAN / Ethernet, Analog Input , Profibus, USB
StorageInternal Memory, SD Card 
Product Weight1.1 LBS
Battery TypeLi-ion 
Product Height1.65 IN
Product Length7.4 IN
Product Width4.6 IN
Shipping Weight1.2 LBS
ECCN NumberEAR99
HTS/Schedule B Number9030330040
Country of OriginMalaysia


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Q & A

Q: How many GL100-WL-xxxx units can be connected wirelessly to the GL240?
A: One GL100-WL-xxxx unit can be connected wirelessly to the GL240. Please note that the B-568 Wireless LAN Unit is required. The B-568 unit is included in the BUNDLE kits and optional on the GL240 alone.

Q: What are the types of wireless connections available on the new series?
A: B-568 wireless option enables a 801.11(b/g/n) WLAN setting where a terminal (or node) connection to a wireless network or a “hot spot” access point connection is made possible. As an “access point” instrument, GL series will allow remote smart devices and wireless PC to access into the GL instruments by using the proprietary hot spot access with the user-defined network. AndroidOS and iOS platforms have a free downloads on their app stores, and the web server interface will allow real-time wireless data access from your PCs web browser.

Q: What about the security? Does it offer password enabled configuration?
A: All wireless configurations come with the ability to set up your WEP or WPA/WPA-2PSK password security on your instruments. Additionally, your firewall can be configured within the network to protect your data. Please consult your IT professional on how to better secure your network. 


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