GRAPHTEC midi LOGGER GL840 Series & GL240
Isolated/Universal Input, Standalone Multi-Channel Datalogger
Setting New Heights in Data Recording
The GRAPHTEC midi LOGGER series offers advanced data recording capabilities with a flexible input system for a wide array of applications, extended memory capacity using an SD memory card, and a maximum sampling interval of up to 10ms.
Key Models:
- ✨ NEW Multi-Input Model: midi LOGGER GL840-M
- ✨ NEW High Voltage Withstand Model: midi LOGGER GL840-WV
- ✨ NEW 10-Channel Portable Model: midi LOGGER GL240
Visit: www.graphteccorp.com
Setting New Industry Standards for It's Class
Accommodates a Wide Variety of Measurements
- Multifunction Analog Input Ports: Features a highly isolated input mechanism to prevent noise interference between channels. Suitable for combined measurements of voltage, temperature, humidity, logic, and pulse signals.
- 4 Channels of Logic/Pulse Inputs: Supports 4-channel logic or pulse signal inputs. Pulse mode enables cumulative, instant, or rotational value measurements for industrial applications.
- Voltage Ranges: From 20mV to 100V.
- Input Types Supported:
- Temperature: Thermocouple types R, S, B, K, E, T, J, N, W; RTD types Pt100, Pt1000, JPt100 (for GL840 only).
- Humidity: 0 to 100%RH (requires optional sensor B-530).
- Logic/Pulse: 4 channels (requires optional input/output cable B-513). Selectable between Logic or Pulse input.
Maximum Sampling Interval of Up to 10ms
Provides faster sampling rates for voltage measurements, achievable when limiting the number of channels in use.
| Sampling Interval | Number of Channels | GL840 Measuring (Voltage/Temp) | GL240 Measuring (Voltage/Temp) |
|---|---|---|---|
| 10ms | 1 | Yes / N/A | Yes / N/A |
| 20ms | 2 | Yes / N/A | Yes / N/A |
| 50ms | 5 | Yes / Yes | Yes / Yes (10ch) |
| 100ms | 10 | Yes / Yes | Yes / Yes (10ch) |
| 200ms | 20 | Yes / Yes | Yes / Yes (10ch) |
| 500ms | 50 | Yes / Yes | Yes / Yes (10ch) |
| 1s | 100 | Yes / Yes | Yes / Yes (10ch) |
| 2s | 200 | Yes / Yes | Yes / Yes (10ch) |
* Chart applicable when data is saved in GBD binary file format. Limited sampling speed applies when using digital sensors and GL100-WL.
Built-in 4GB Flash Memory with SD Card Support
Enables reliable long-term measurement with 4GB internal flash memory and an SD card slot supporting SDHC memory cards up to 32GB.
| Model | Sampling | GBD format (20ch) | CSV format (20ch) | GBD format (10ch) | CSV format (10ch) |
|---|---|---|---|---|---|
| GL840 | 10ms | 31 days | 3 days | N/A | N/A |
| 50ms | 77 days | 11 days | |||
| 100ms | 95 days | 16 days | N/A | N/A | |
| 200ms | 108 days | 21 days | |||
| 500ms | 270 days | 54 days | N/A | N/A | |
| 1s | over 365 | 109 days | |||
| 10s | over 365 | over 365 | N/A | N/A | |
| GL240 | 10ms | N/A | N/A | 41 days | |
| 50ms | 88 days | 12 days | |||
| 100ms | 103 days | 18 days | |||
| 200ms | 207 days | 36 days | |||
| 500ms | over 365 | 91 days | |||
| 1s | over 365 | 182 days | |||
| 10s | over 365 | over 365 |
* Figures are approximate. File size is 2GB. Sampling interval is limited by the number of channels in use (10ms: 1ch, 50ms: 5ch, 100ms: 10ch). Limited sampling speed applies when using digital sensors and GL100-WL.
Useful Functions
- Display Options: Waveform display (Analog + Digital), Digital display, Dual display (Current + Past data).
- Bar Chart: Displays integrated data from digital sensors. Supports line charts with specific sensors (e.g., GS-TH, GS-DPA-AC, GS-LXUV).
- Alarm Output Function: Four channel alarm output ports based on set conditions. Requires optional input/output cable (B-513).
- USB Drive Mode: Enables drag-and-drop data transfer to a PC.
- Ring Capture Function: Saves the most recent data when memory is configured in ring mode (1,000 to 2,000,000 data points).
- Relay Capture Function: Continuously saves data to multiple files up to 2GB without data loss until capturing stops.
- Hot-Swapping the SD Memory Card: Allows SD card replacement during data capturing (with exceptions for GL100-WL).
- Navigation Function: Provides a simple interface for measurement and wireless LAN adapter settings.
- Power Sources: Supports AC power adapter, DC supply (with optional cable B-514), and rechargeable battery pack (optional B-569).
- Networking Features: Web & FTP server for external control and monitoring, FTP client for periodic data backup, and NTP client for clock synchronization. Requires LAN connection.
GL840 Expands to Two Models for Application-Specific Use
- Multi-Input Model (midi LOGGER GL840-M): Ideal for temperature measurement with multiple channels.
- High Voltage Withstand Model (midi LOGGER GL840-WV): Suited for stacked high voltage battery applications and high-precision temperature measurement.
Expandable Up to 200 Channels
Standard configuration includes 20 analog input channels, expandable to 200 channels by adding optional 20-channel extension terminal base units (B-566) and input terminal units (B-564 or B-565). The expansion process involves connecting these units in a daisy-chain configuration.
| Configuration | GL840 Unit | Connection Cable (B-567) | Terminal Base (B-566) | Input Terminal (B-564/565) |
|---|---|---|---|---|
| 20 channels | 1 set | N/A | N/A | N/A |
| 40 channels | 1 set | 1 pc | 2 sets | 1 set |
| 100 channels | 1 set | 1 pc | 5 sets | 4 sets |
| 200 channels | 1 set | 1 pc | 10 sets | 9 sets |
* Input terminal blocks can be mixed, but overall voltage and accuracy are limited by the B-564 rating.
Three Types of Input Systems Enable Measurement of Various Signals
The midi LOGGER supports basic analog signals, logic/pulse signals, and digital sensors for comprehensive measurement capabilities.
Support Digital Sensors
Digital sensors and input terminal/adapters for the GL100 can connect directly to the GL840. Supported sensors include:
- Temperature/Humidity: GS-TH
- Acceleration/Temperature: GS-3AT
- Carbon Dioxide: GS-CO2
- Illuminance/UV: GS-LXUV
- Voltage/Temperature: GS-4VT
- Thermistor Input Terminal: GS-4TSR
- AC Current Sensor Adapter: GS-DPA-AC
Longer Cables for Input Terminals: Input terminals can be connected directly or via extension cables (up to 20m) for flexible placement.
Dual Port Adapter: The GS-DPA allows simultaneous connection of up to two sensor modules (e.g., Temp/Humidity & Illuminance/UV).
High Performance Software for PC (GL100_240_840-APS)
This software supports the GL840, GL240, and GL100 series, allowing control of up to 10 units and 1000 channels simultaneously. Key features include:
- Measurement Screens: Y-T waveform, digital monitoring, statistical calculations, and bar charts.
- Scheduling Function: Set automatic measurement start and stop times.
- Group Function: Manage multiple units for simultaneous control and data saving.
- File Operation: Merge multiple data files, import data as new channels, and bind data along a time axis.
- Data Format Conversion: Convert GBD format to CSV, with options for compression or saving interval values (average, max, min).
- Warning Function: Send email notifications upon alarm occurrence.
- Statistical Calculation: Compute maximum, minimum, and average values during data capture.
- Report Function: Automatically create daily or monthly reports.
Main Unit Series Specifications
| Item | Description | GL840-M/GL840-WV | GL240 |
|---|---|---|---|
| Model Number | GL840-M/GL840-WV | GL240 | |
| Number of Analog Input Channels | Standard Configuration | 20 channels | 10 channels |
| Expandable | Up to 200 channels | N/A | |
| Number of Analog Input Terminals | Standard Configuration | 1 terminal | N/A |
| Expandable | Up to 10 terminals | N/A | |
| Type of Analog Input Terminal | Multi-input type, Withstand-voltage type | N/A | |
| Port for Digital Sensor | 1 port for GL100 sensor/terminal | N/A | |
| External Input/Output | 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 | ||
| Trigger, 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: AND / OR; Analog signal: Rising (High), Falling (Low), Window-in, Window-out; Logic signal: Pattern; Pulse (number of count): Rising (High), Falling (Low), Window-in, Window-out | ||
| Pulse Input Function | Rotation Count (RPM) Mode | Counts pulses per sampling interval and converts to rpm (rotations per minute). Number of pulses for one rotation can be set. | |
| Accumulating Count Mode | Accumulates the number of pulses from the start of measurement. | ||
| Instant Count Mode | Counts the number of pulses per sampling interval. | ||
| Calculation Function | Between Channels | Addition, Subtraction, Multiplication, and Division for analog input. | |
| Statistical | Select two calculations from Average, Peak, Maximum, Minimum, RMS. | ||
| Interface to PC | Ethernet, USB 2.0 (Hi-speed) | USB 2.0 (Hi-speed) | |
| Storage Device | Internal | Built-in 4GB Flash Memory (*6) | |
| External | One SD card slot (Supports SDHC memory card, up to 32GB) (*7) | ||
| Saved Contents | Captured data, Setting conditions, Screen copy | ||
| Capturing Mode | Mode | Normal, Ring, Relay | |
| Ring | Saves most recent data (1000 to 2,000,000 points) (*8) | ||
| Relay | Saves data to multiple files without losing data until capturing stops. | ||
| Replay Data (GBD/CSV) | Replays captured data saved in GL840 | Replays captured data saved in GL240 | |
| Scaling (Engineering Unit) Function | Converts measured value to specified engineering unit (Analog voltage: 4 reference points; Temperature: 2 reference points; Pulse count: 2 reference points). | ||
| Action During Data Capture | Displaying past data (dual display), Hot-swapping SD card, Saving data between cursors. | ||
| Display (LCD) | Size | 7-inch color TFT (WVGA: 800 x 480 dots) | 4.3-inch color TFT (WQVGA: 480 x 272 dots) |
| Language | English, French, German, Chinese, Korean, Russian, Spanish, Japanese | ||
| Information (*9) | Waveform (Y-T), Digital values, Statistics, Bar chart (GL840 only). | ||
| Operating Environment | 0 to 45 ºC, 5 to 85 % RH (non-condensed) | ||
| Power Source | AC Adapter | 100 to 240 V AC, 50/60 Hz | |
| DC Power | 8.5 to 24 V DC (requires B-514) | ||
| Battery Pack | Mountable battery pack (optional B-569: 7.2V DC, 2900mAh) | ||
| Power Consumption (*10) | Max. 38 VA | Max. 36 VA | |
| External Dimensions (W x D x H mm) | Approx. 240 x 158 x 52.5 (GL840-M) Approx. 240 x 166 x 52.5 (GL840-WV) | Approx. 188 x 117 x 42 | |
| Weight (*11) | Approx. 1010 g (GL840-M) Approx. 1035 g (GL840-WV) | Approx. 500 g |
Analog Input Specifications
| Item | Model | Input Method | Measurement Range | Accuracy (Voltage) | Accuracy (Temperature - Thermocouple) | Accuracy (Temperature - RTD) |
|---|---|---|---|---|---|---|
| Voltage | GL840 Series | All channels isolated balanced input (*12), Screw terminal (M3) | 20, 50, 100, 200, 500 mV, 1, 2, 5, 10, 20, 50, 100 V, 1-5V F.S. | ±0.1% of F.S. | See detailed table below | See detailed table below |
| GL240 | 20, 50, 100, 200, 500 mV, 1, 2, 5, 10, 20, 50, 100 V, 1-5V F.S. | ±(0.05% of F.S. + 10µV) | ||||
| Thermocouple | GL840 Series | Type: K, J, E, T, R, S, B, N, W (WRe5-26) Range: 100, 500, 2000 ºC (*13) |
±0.1% of F.S. | |||
| GL240 | Type: K, J, E, T, R, S, B, N, W (WRe5-26) | ±0.1% of F.S. | See detailed table below | See detailed table below | ||
| RTD | GL840 Series | Type: Pt100 (IEC751), Pt1000 (IEC751), JPt100 (JIS) Range: 100, 500, 2000 ºC (*13) |
±0.1% of F.S. | |||
| Humidity | GL840 Series | 0 to 100 % RH (using optional sensor B-530) | N/A | N/A | N/A | |
| Filter | Off, 2, 5, 10, 20, 40 (moving average) |
Detailed Temperature Accuracy (Thermocouple)
| Type | Measurement Range (*16) | Measurement Accuracy | ||
|---|---|---|---|---|
| GL840-M (B-564) | GL840-WV (B-565) | GL240 | ||
| R/S | 0 ≤ TS ≤ 100 ºC | ±5.2 ºC | ±4.5 ºC | ±5.2 ºC |
| 100 < TS ≤ 300 ºC | ±3.0 ºC | ±3.0 ºC | ±3.0 ºC | |
| R: 300 < TS ≤ 1600 ºC | ±(0.05% of rdg. + 2.0 ºC) | ±2.2 ºC | ±(0.05% of rdg. + 2.0 ºC) | |
| S: 300 < TS ≤ 1760 ºC | ±(0.05% of rdg. + 2.0 ºC) | ±2.2 ºC | ±(0.05% of rdg. + 2.0 ºC) | |
| B | 400 ≤ TS ≤ 600 ºC | ±3.5 ºC | ±3.5 ºC | ±3.5 ºC |
| 600 < TS ≤ 1820 ºC | ±(0.05% of rdg. + 2.0 ºC) | ±2.5 ºC | ±(0.05% of rdg. + 2.0 ºC) | |
| K | -200 ≤ TS ≤ -100 ºC | ±(0.05% of rdg. + 2.0 ºC) | ±1.5 ºC | ±(0.05% of rdg. + 2.0 ºC) |
| -100 < TS ≤ 1370 ºC | ±(0.05% of rdg. + 1.0 ºC) | ±0.8 ºC | ±(0.05% of rdg. + 1.0 ºC) | |
| E | -200 ≤ TS ≤ -100 ºC | ±(0.05% of rdg. + 2.0 ºC) | ±1.0 ºC | ±(0.05% of rdg. + 2.0 ºC) |
| -100 < TS ≤ 800 ºC | ±(0.05% of rdg. + 1.0 ºC) | ±0.8 ºC | ±(0.05% of rdg. + 1.0 ºC) | |
| T | -200 ≤ TS ≤ -100 ºC | ±(0.1% of rdg. + 1.5 ºC) | ±1.5 ºC | ±(0.1% of rdg. + 1.5 ºC) |
| -100 < TS ≤ 400 ºC | ±(0.1% of rdg. + 0.5 ºC) | ±0.6 ºC | ±(0.1% of rdg. + 0.5 ºC) | |
| J | -200 ≤ TS ≤ -100 ºC | ±2.7 ºC | ±1.0 ºC | ±2.7 ºC |
| -100 < TS ≤ 100 ºC | ±1.7 ºC | ±0.8 ºC | ±1.7 ºC | |
| 100 < TS ≤ 1100 ºC | ±(0.05% of rdg. + 1.0 ºC) | ±0.6 ºC | ±(0.05% of rdg. + 1.0 ºC) | |
| N | -200 ≤ TS < 0 ºC | ±(0.1% of rdg. + 2.0 ºC) | ±2.2 ºC | ±(0.1% of rdg. + 2.0 ºC) |
| 0 ≤ TS ≤ 1300 ºC | ±(0.1% of rdg. + 1.0 ºC) | ±1.0 ºC | ±(0.1% of rdg. + 1.0 ºC) | |
| W | 0 ≤ TS ≤ 2000 ºC | ±(0.1% of rdg. + 1.5 ºC) | ±1.8 ºC | ±(0.1% of rdg. + 1.5 ºC) |
| R.J.C. | ±0.5 ºC | ±0.3 ºC | ±0.5 ºC | |
Detailed Temperature Accuracy (RTD)
| Type | Measurement Range (*16) | Measurement Accuracy | ||
|---|---|---|---|---|
| GL840-M (B-564) | GL840-WV (B-565) | GL240 | ||
| Pt100 | -200 ≤ TS ≤ 100 ºC | ±1.0 ºC | ±0.6 ºC | N/A |
| 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 | |||
Technical Details
- A/D Converter: Sigma-Delta type, 16 bits (effective resolution: 1/40000 of the measuring full range).
- Maximum Input Voltage: Varies by range and model (e.g., 60 Vp-p to 110 Vp-p for channels, 60 Vp-p to 300 Vp-p for channel/GND).
- Maximum Withstand Voltage: Varies by configuration (e.g., 350 Vp-p to 2300 Vrms AC for 1 minute).
Options and Accessories
A wide range of optional accessories are available to enhance the functionality of the midi LOGGER series, including:
- Input Terminals (Multi-input B-564, Withstand voltage B-565)
- Extension Base Units (B-566) and Cables (B-567)
- Battery Pack (B-569)
- Input/Output Cable (B-513), DC Drive Cable (B-514)
- Humidity Sensor (B-530)
- Various Digital Sensors (GS-TH, GS-3AT, GS-CO2, GS-LXUV, GS-4VT, GS-4TSR, GS-DPA-AC)
- AC Current Sensors (GS-AC50A, GS-AC100A, GS-AC200A)
- Dual Port Adapter (GS-DPA)
- Shunt Resistor (B-551-10)
- AC Power Adapter (ACADP-20)
- Mounting Brackets (B-570, B-540)
Software Specifications for PC (GL100_240_840-APS)
- Supported OS: Windows 10, 8.1, 8, 7, Vista (32/64-bit).
- Supported Devices: GL840 (USB, Ethernet), GL240 (USB), GL100 (USB).
- Functions: Control GL series units, real-time data capture, data replay, data format conversion.
- Supported Units & Channels: Up to 1000 channels total, up to 4 groups.
- Settings Control: Input condition, capturing condition, trigger/alarm condition, report generation.
- Data Saving: To PC (real-time, GBD or CSV format) or to GL unit (SD card, GBD or CSV format).
- Displayed Information: Y-T waveform, digital values, reports, X-Y graphs, dual display (current/past), statistical calculations, bar charts.
- File Operation: Convert GBD to CSV, merge data files by time axis or as additional channels.
- Warning Function: Email notifications for alarms.
- Statistical Calculation: Maximum, Minimum, Average during capture.
- Report Function: Automatic daily or monthly reports.
Important Notes:
- For correct and safe equipment usage, read the user manual.
- Ensure proper grounding to avoid malfunction or electric shock.
- Data files on the instrument are not guaranteed against loss due to equipment or PC failure; back up data regularly.
- Brand names and product names are trademarks of their respective owners.
- Specifications are subject to change without notice. Refer to the website or contact a representative for the latest information.
