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Graphtec- GL900 Series
Graphtec- GL900 Series - Image 2

Graphtec- GL900 Series

The GL900 Series is a compact, high-precision data logger for measuring voltage, temperature, humidity, logic, and pulse signals. It is designed for industrial and laboratory monitoring with easy setup and clear display.

  • Multichannel inputs – 4 or 8 analog channels, plus logic/pulse inputs.
  • High-speed sampling – from 10 μs to 1 min per channel.
  • Data storage – 256 MB internal memory and USB support.
  • Display – 5.7-inch color LCD shows waveforms, digital values, and statistics.

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Description

The Graphtec GL900 Series is a high-precision, multi-channel data logger designed for industrial and laboratory applications that require accurate measurement of voltage, temperature, humidity, logic, and pulse signals. Available in 4- or 8-channel configurations, the GL900 features isolated inputs, simultaneous sampling, and a fast 10 µs to 1 min sampling interval. It offers flexible trigger and alarm functions, statistical calculations, and multiple display modes on a 5.7-inch TFT color LCD. Data can be recorded to internal memory, USB flash drives, or LAN-connected storage, supporting both real-time monitoring and long-term data acquisition.

The system supports a wide range of thermocouples, RTDs, and voltage ranges with high measurement accuracy, while isolated inputs and robust withstand voltages ensure safety and reliability in industrial environments. With Ethernet and USB interfaces, built-in web and FTP server functionality, and optional battery operation, the GL900 provides versatile connectivity and portability. Its control software enables real-time data capture, visualization, and conversion between binary and CSV formats, making the GL900 Series ideal for detailed process monitoring, testing, and research applications.

Features

  • Multichannel inputs – 4 or 8 analog channels, plus logic/pulse inputs.
  • High-speed sampling – from 10 μs to 1 min per channel.
  • Data storage – 256 MB internal memory and USB support.
  • Display – 5.7-inch color LCD shows waveforms, digital values, and statistics.

Specifications

Item Description
GL900-8 GL900-4
No. of analog input ch. 8 ch 4 ch
External input/output Trigger input (1 channel), Logic input (4 channels) or Pulse input (4 channels), Alarm output (4 channels)
Sampling interval 10μs to 1 min
TIME/DIV 10 ms/DIV to 24 hour/DIV
Timer functions Date and time, daily cycle, hourly cycle
Trigger functions Type Start: Data capture starts when a trigger is activated; Stop: Data capture stops when a trigger is activated
Condition Start: Off, Input signal level (analog, logic/pulse), External*1, Scheduled time
Stop: Off, Input signal level (analog, logic/pulse), External *1, Scheduled time
Combination Input signal level: Level OR, Level AND, Edge OR, Edge AND
Mode H (Rising), L (Falling), Window In*2, Window Out*2
Alarm setting functions Rising, Falling, Window In*2, Window Out*2
Alarm output *1 Number of channels: 4, Open collector output (5V, 10 kΩ pull-up resistance)
Pulse input*1, *3 RPM mode 50 to 20 M RPM/F.S. (in steps of 1, 2, or 5)
Count mode 50 to 20 M C/F.S. (in steps of 1, 2, or 5)
Inst. Mode 50 to 20 M C/F.S. (in steps of 1, 2, or 5)
Calculation functions Statistical calculations *4: Average, Peak, Maximum, Minimum, RMS (2 calculations can be set simultaneously)
Other functions Search function, annotation input function
PC inteface Ethernet (10BASE-T/100BASE-TX), USB (High Speed supported) provided as standard
Ethernet functions Web server function, FTP server function, NTP client function
USB function USB drive mode (File transfer and deletion from internal GL900 memory)
Memory device Internal One million data points / Internal flash memory:Approx. 256 MB
External USB memory slot (High speed supported) *5
Display screens Waveforms + digital values, enlarged waveforms, digital values + calculation results, X-Y
Display unit 5.7-inch TFT color LCD
Operating environment 0 to 40℃, 5 to 85% R.H. (15 to 35℃ when using batteries)
Withstand voltage Between each input channel and GND: 1000 V p-p for one minute, between input terminals: 1000 Vp-p for one minute
Power supply AC adapter 100 to 240 VAC, 50 to 60 Hz
DC input 8.5 to 24 VDC
Battery pack *6 Option
Power consumption 42VA (when operating and charging battery with AC power) 40VA (when operating and charging battery with AC power)
External dimensions 232 x 150 x 80 mm (W x H x D), approx.
Weight (approx.) 1.1 kg (excluding AC adapter and battery) 1.0 kg (excluding AC adapter and battery)
Vibration-tested conditions Equivalent to automobile parts Type 1 Category A classification

Terminal block specifications

Item Description
GL900-8 GL900-4
Number of input channels Fixed to 8 channels Fixed to 4 channels
Input terminal type Voltage BNC connector
Temperature M3 screw type terminal board *7
Input method All channels isolated Imbalanced input Simultaneous sampling of all channels
Measurement ranges Voltage 20, 50, 100, 200, 500 mV; 1, 2, 5, 10, 20, 50, 100, 200, 500 V F.S., 1-5 V F.S.
Temperature Thermocouples : K, J, E, T, R, S, B, N, W (WRe5-26)
Humidity 0 to 100% (voltage 0 V to 1 V scaling conversion) * with B-530 (option)
Input filter Off, Line, 5 Hz, 50 Hz, 500 Hz
Measurement accuracy *8
(23°C±5°C)
When 30 minutes or more have elapsed after power was switched on Filter : Line
GND : connected		 Voltage ±0.25% of F.S.
Thermocouple Type Measurement temperature range Measurement accuracy
R/S 0°C ≦ TS ≦ 100°C ±7.0°C
100°C < TS ≦ 300°C ±5.0°C
R:300°C < TS ≦ 1600°C ±(0.05% of rdg +3.0°C)
S:300°C < TS ≦ 1760°C ±(0.05% of rdg +3.0°C)
B 400°C ≦ TS ≦ 600°C ±5.5°C
600°C < TS ≦ 1820°C ±(0.05% of rdg +3.0°C)
K -200°C ≦ TS ≦ -100°C ±(0.05% of rdg +3.0°C)
-100°C < TS ≦ 1370°C ±(0.05% of rdg +2.0°C)
E -200°C ≦ TS ≦ -100°C ±(0.05% of rdg +3.0°C)
-100°C < TS ≦ 800°C ±(0.05% of rdg +2.0°C)
T -200°C ≦ TS ≦ -100°C ±(0.1% of rdg +2.5°C)
-100°C < TS ≦ 400°C ±(0.1% of rdg +1.5°C)
J -200°C ≦ TS ≦ -100°C ±3.7°C
-100°C < TS ≦ 100°C ±2.7°C
100°C < TS ≦ 1100°C ±(0.05% of rdg +2.0°C)
N 0°C ≦ TS ≦ 1300°C ±(0.1% of rdg +2.0°C)
W 0°C ≦ TS ≦ 2000°C ±(0.1% of rdg +2.5°C)
Reference contact compensation accuracy : ±1.0°C
‡ Thermocouple diameters T: 0.32mm, others: 0.65mm
A/D converter 16 bits (out of which 14 bits are internally acknowledged)
Input resistance 1MΩ ±5%
Allowable signal source resistance Up to 1kΩ
Maximum permissible input voltage Between + and – input terminals 20 mv to 1 V : ±30VDC
2 V to 500 V : ±500VDC
Between input channel terminals 60 Vp-p
Between input channel terminal and GND terminal 60 Vp-p
Withstand voltage Between input channel terminal and GND terminal 1 minute at 1000 Vp-p
Between input channel terminals 1 minute at 1000 Vp-p
*1
Logic alarm cable (B-513) is required.
*2
Cannot be set for logic input
*3
Maximum input frequency: 50 kHz, maximum number of counts: 15 M C
*4
In real time or when Between Cursors has been specified (during Replay)
*5
1 file = 2 Gbytes (depends on the USB memory stick used)
*6
Please install two battery packs.
*7
Connections are made to both the BNC terminal and M3 screw terminal for the same channel.
*8
Thermocouple diameters T:0.32φ, others:0.65φ
*9
Operating temperature range: -25 to +80°C

Control software specifications

Item Description
Supported OS Windows 2000, Windows XP, Windows Vista (32-bit and 64-bit versions)
Functions GL900 control, real-time data capture, data conversion
Setting range Amp settings, data capture settings, trigger settings, alarm settings, other
Captured data Real-time data Binary: Sampling speed: 10 μs to 60 s
CSV: Sampling speed: 10 ms to 60 s
Data conversion Binary, CSV
Display information Analog waveforms, logic waveforms, pulse waveforms, digital values
File conversion Data between cursors, All data
2-screen function (Zoom) Display of current and past data
Display of statistics and history Display of maximum, minimum, and average values

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