Specfication & Accessory

GL840 Main unit specifications

Item Description
Model number GL840-M GL840-WV
Number of analog input channels 20 channels in standard configuration, Expandable up to 200 channels
Number of analog input terminals Up to 10 terminals (20 channels / terminal), standard config: 1
Type of analog input terminal Multi-input type, Withstand-voltage type
Port for digital sensor 1 port for the sensor/input terminal/adapter of the GL100
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 1 sec. 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
(RPM) mode
Counts the number of pulses per sampling interval and converts to rpm
(rotations per minute), Number of pulses for one rotation can be set to
50, 500, 5000, 50k, 500k, 5M, 50M, 500M rpm/F.S. (rpm./Full Scale)
count mode
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)
Maximum number of pulse inputs Maximum input frequency : 50kHz
Maximum number of count : 50kC/sampling (16-bit counter)
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 Ethernet (10 BASE-T/100 BASE-TX), USB (Hi-speed), WLAN (using B-568 option)
Internal Built-in 4GB Flash Memory *6
External One SD card slot (Support SDHC memory card, up to 32GB) *7
Saved contents Captured data, Setting conditions, Screen copy
Back up recording data function Backup interval *8 Off, 1, 2, 6, 12, 24 hour(s)
Backup file destination *8 SD memory card or FTP server
Data format *8 GBD (binary) or CSV (test)
Check-sum function (Verifies data file) OFF: Not adding check-sum code to data file.
ON: Adding check-sum code to data file. Check-sum code is verified when replaying data on the GL unit or GL-Connection software.
Capturing mode Mode: Normal, Ring, Relay
Ring: Saves most recent data (Number of capturing data: 1000 to 2000000 points) *9
Relay: Saves data to multiple files without losing data until dada capturing is stopped
Replay data Replays captured data that was saved in the GL840 (in GBD or CSV format)
Scaling (Engineering unit) function Measured value can be converted to 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 past data (using dual display mode (Current + Past data))
• Hot-swapping the SD memory card
• Saving data in between cursors
Display Size 7-inch TFT color LCD (WVGA: 800 x 480 dots)
Language English, French, German, Chinese, Korean, Russian, Spanish, Japanese
Information *10 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 two battery packs (battery pack (option B-569): 7.2V DC, 2900mAh)
Power consumption *11 Max. 38 VA
External dimensions (W x D x H
in mm, Excluding projections)
Approx. 246 x 161 x 58.2 (with the cover) Approx. 246 x 170.4 x 58.2 (with the cover)
Weight *12 Approx. 1218 g (the cover is attached) Approx. 1244 g (the cover is attached)
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)
<Maximum rating of the output transistor>
  • 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.
The built-in Flash memory is available for units with serial numbers C604XXXX or later. Please contact your local representative for more information.
SD memory card cannot be used on the SD card slot while the wireless LAN unit (opton B-568) is used.
- When the RING mode or external pulse synchronization sampling is selected for recording, the backup function is not available.
- When there are meany number of active channels, the sampling time is fast, or the backup interval is long, it may take time to closing the data file after recording stops because the size of the data to be backed up becomes large.
- When saving file to FTP server using wireless LAN connection, backup may fail depending on the communication condition.
- Available sampling speed is the 100 ms or slower when using the CSV format.
- When backup is enabled and data file format is specified with CSV format, SD memory card exchange (hot-swapping) and RELAY recording are not available.
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(s)
being charged.
Excludes AC adapter and battery pack.

GL840 Analog input specifications

Item Description
Model number GL840-M, Input terminal B-564 GL840-WV, Input terminal B-565
Input method All channels isolated balanced input *13, 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, W (WRe5-26)
Range: 100, 500, 2000 ºC *14
RTD (Resistance
Temperature Detector)
Type: Pt100, Pt1000 (IEC751), JPt100 (JIS)
Range: 100, 500, 2000 ºC *14
Humidity 0 to 100 % RH - using the humidity sensor (option B-530)
Filter Off, 2, 5, 10, 20, 40 (moving average in selected number)
Measurement accuracy *15
Voltage ± 0.1% of F.S. (Full Scale) ± (0.05% of F.S. + 10μV)
Temperature (Thermocouple) *16
  Type Measurement range
(TS: Temp Sense)
Measurement accuracy Measurement accuracy
R 0 ≤ TS ≤ 100 ºC ± 5.2 ºC ± 4.5 ºC
100 < TS ≤ 300 ºC ± 3.0 ºC ± 3.0 ºC
300 < TS ≤ 1600 ºC ± (0.05% of rdg. + 2.0 ºC) ± 2.2 ºC
S 0 ≤ TS ≤ 100 ºC ± 5.2 ºC ± 4.5 ºC
100 < TS ≤ 300 ºC ± 3.0 ºC ± 3.0 ºC
300 < TS ≤ 1760 ºC ± (0.05% of rdg. + 2.0 ºC) ± 2.2 ºC
B 400 ≤ TS ≤ 600 ºC ± 3.5 ºC ± 3.5 ºC
600 < TS ≤ 1820 ºC ± (0.05% of rdg. + 2.0 ºC) ± 2.5 ºC
K -200 ≤ TS ≤ -100 ºC ± (0.05% of rdg. + 2.0 ºC) ± 1.5 ºC
-100 < TS ≤ 1370 ºC ± (0.05% of rdg. + 1.0 ºC) ± 0.8 ºC
E -200 ≤ TS ≤ -100 ºC ± (0.05% of rdg. + 2.0 ºC) ± 1.0 ºC
-100 < TS ≤ 800 ºC ± (0.05% of rdg. + 1.0 ºC) ± 0.8 ºC
T -200 ≤ TS ≤ -100 ºC ± (0.1% of rdg. + 1.5 ºC) ± 1.5 ºC
-100 < TS ≤ 400 ºC ± (0.1% of rdg. + 0.5 ºC) ± 0.6 ºC
J -200 ≤ TS ≤ -100 ºC ± 2.7 ºC ± 1.0 ºC
-100 < TS ≤ 100 ºC ± 1.7 ºC ± 0.8 ºC
100 < TS ≤ 1100 ºC ± (0.05% of rdg. + 1.0 ºC) ± 0.6 ºC
N -200 ≤ TS < 0 ºC ± (0.1% of rdg. + 2.0 ºC) ± 2.2 ºC
0 ≤ TS ≤ 1300 ºC ± (0.1% of rdg. + 1.0 ºC) ± 1.0 ºC
W 0 ≤ TS ≤ 2000 ºC ± (0.1% of rdg. + 1.5 ºC) ± 1.8 ºC
R.J.C. ± 0.5 ºC ± 0.3 ºC
Temperature (RTD) *17
Type Measurement range
(TS: Temp Sense)
Accuracy Accuracy
Pt100 -200 ≤ TS ≤ 100 ºC ± 1.0 ºC ± 0.6 ºC
100 < TS ≤ 500 ºC ± 0.8 ºC
500 < TS ≤ 850 ºC ± 1.0 ºC
Pt1000 -200 ≤ TS ≤ 100 ºC ± 0.8 ºC ± 0.6 ºC
100 < TS ≤ 500 ºC ± 0.8 ºC
JPt100 -200 ≤ TS ≤ 100 ºC ± 0.8 ºC ± 0.6 ºC
100 < TS ≤ 500 ºC ± 0.8 ºC
A/D converter Sigma-Delta type, 16 bits (effective resolution: 1/40000 of the measuring full range)
Input resistance 1MΩ ±5%
Allowable signal source resistance Up to 300Ω Up to 100Ω
input voltage
(+) / (-) terminal
20 mV to 2 V range: 60 Vp-p,
5 V to 100 V range: 110 Vp-p
Channels ((-) / (-)) 60 Vp-p 600 Vp-p
Channel / GND 60 Vp-p 300 Vp-p
Max. voltage
Between channels 350 Vp-p (1 minute) 600 Vp-p
Channel / GND 350 Vp-p (1 minute) 2300 Vrms AC (1 minute)
The terminal "b" for using the RTD is connected each other across all channels.
If the specifications of the temperature sensor is lesser or greater than the selected measurement range, GL840
can measure up to the specifications of the sensor.
Subject to the following conditions:
  • Room temperature is 23 oC ± 5 oC.
  • When 30 minutes or more have elapsed after power has turned on.
  • Filter is set to 10.
  • Sampling rate is set to 1 sec, using 20-channel in GL840-M and 10-channel in GL840-WV.
  • GND terminal is connected to ground.
Wire size of thermocouple used is 0.32mm diameter in the T or K type and 0.65mm diameter in other types.
Supports 3-wire type sensor.

Software specifications for PC

Item Description
Model name GL100_240_840-APS
Supported OS Windows 10, 8.1, 8, 7, Vista (32/64-bit edition)
Supported device GL840 (USB, Ethernet, 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, Capturing 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

Item Description
Model name GL-Connect
Supported OS Android 4.1 to 6.0, iOS 9/10/11
Supported device GL840 (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

Item Description
Model number B-568
Supported device GL840
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 Attaches to the SD card slot *7
Function Access Point mode: Communicate with the GL100-WL as a remote sensor
(captured data in the GL100-WL is transferred to GL840)
Station mode: Communicate with PC or Smart device (control GL840 and
transfer the data from GL840)
Connected number of GL100-WL GL840: Up to 5 units of the GL100-WL

Humidity Sensor B-530 (option) Specifications

Item Description
Allowable temperature range -25 to 80℃
Allowable humidity range 0 to 100% RH
Relative humidity measurement accuracy ±3% RH(5 to 98% RH at 25℃)
Method Capacitance method
Relative humidity measurement accuracy (5 to 98%) Measurement environment Measurement accuracy
0 to 10℃ ±5% RH
10 to 20℃ ±4% RH
20 to 30℃ ±3% RH
30 to 40℃ ±4% RH
40 to 50℃ ±5% RH
50 to 60℃ ±6% RH
60 to 70℃ ±7% RH
70 to 80℃ ±8% RH
* Measurement accuracy at 60℃ or more is a reference value.
Response time 15 sec. (90% response when membrance filter is installed)
Sensor output 0 to 1 VDC
External dimensions Φ14 x 80 mm (excluding cable)
Cable length 3 m
Sensor power source DC + 5 to +16 V
Power consumption approx. 4 mA

Options and Accessories

Item Model number Description
Input terminal (Multi-inputs) B-564 20ch input terminal, multi-input type
Input terminal (Withstand voltage B-565 20ch input terminal, withstand-high-voltage type
Base unit for input terminal B-566 Base unit for input terminal (B-564 or 565)
Connection cable
for extension terminal
B-567-05 Cable to connect GL840 and B-566, 50 cm long
B-567-20 Cable to connect GL840 and B-566, 2 m long
Wireless LAN unit B-568 WLAN adapter, IEEE802.11 b / g / n
Battery pack B-569 Rechargeable Lithium-ion battery (7.2 V, 2900mAh)
Cover B-578 Rubber protector (for replacement)
Bracket for DIN rale (GL840 main body) B-570 Bracket for DIN rail (GL840 main body), Build-to-order
Bracket for DIN rail (extension terminal) B-540 Bracket for DIN rail (Input terminal), Build-to-order
Input/Output cable for GL series B-513 2 m long (no clip on end of cable)
DC drive cable B-514 2 m long (no clip on end of cable)
Humidity sensor B-530 With 3 m long signal cable (with power plug)
Shunt resistor B-551-10 250 ohms 0.1% (it converts the signal to the "1-5V" from the "4-20mA")
Storage case B-581 Storage for GL series (except GL7000 and GL100)
AC power adapter ACADP-20 For replacement
Input: 100 to 240 V AC, Output: 24 V DC
Temp & Humidity sensor GS-TH Temperature and humidity measurement
Illuminance & UV sensor GS-LXUV Illuminance and UV intensity measurement, cable 20cm long
Carbon Dioxide (CO2) sensor GS-CO2 CO2 measurement, cable 20cm long
Acceleration & Temp sensor GS-3AT Acceleration and temperature measurement, cable 20cm long
Thermistor input terminal GS-4TSR Temp measurement (using a Thermistor), cable 20cm long
Thermistor sensor (Normal type) GS-103AT-4P Temperature sensor (-40 to 105 ºC), 3m long, 4pcs/set
Thermistor sensor (Ultrathin type) GS-103JT-4P Temperature sensor (-40 to 120 ºC), 3m long, 4pcs/set
AC current sensor adapter GS-DPA-AC Current measurement (using a CT), cable 20cm long
AC current sensor (50A) GS-AC50A Current sensor (CT) 50A, cable 20cm long
AC current sensor (100A) GS-AC100A Current sensor (CT) 100A, cable 20cm long
AC current sensor (200A) GS-AC200A Current sensor (CT) 200A, cable 20cm long
Voltage & Temp input terminal GS-4VT Voltage or Temperature (using a thermocouple), cable 20cm long
Module extension cable GS-EXC Extension cable for the sensor / terminal / adapter module, 1.5m long
Dual port adapter GS-DPA Connect up to 2 sensor modules