The Graphtec GL820 is a compact, lightweight multi-channel Data Logger. The standard configuration has 20 isolated input channels and can be expanded in 20 channel increments up to a total of 200 channels.
The GL-820 features a high resolution 5.7" TFT color display and an easy to navigate menu system for in-field changes to set up parameters.
Data can be captured in a variety of ways. Save directly to the 
2GB internal flash memory or to a hot swappable USB memory stick. You can also save directly to a network drive via Ethernet or to a PC via USB cable. The Web & FTP server functions built in to the GL820 allow for control and monitoring and data transfer from a remote location.
- 20 Isolated Input channels, expandable to 200
- Sample Up To 10 times per second (100ms) Using 10 Channels or Less
- Sample Up To 5 times per second (200ms) Using 11 Channels or More
- Accepts voltage or thermocouple inputs and optional cable inputs for (4) pulse/Logic or (1) Humidity
GL820 Data Logger Specifications
| Number of Channels | 20 Analog Signal Input Channels (Expandable to 200 Channels using #B-537 and #B-538) |
| Input Channels | Types: Trigger (1 Channel), Logic/Pulse (4 Channels) Max. Input Voltage: 0 to 24 Volts (Single-Ended Ground) Input Threshold Voltage: Approx. +2.5 Volts Hysteresis: Approx. 0.5 Volts (+2.5 Volts to + 3 Volts) Method: Scans by the Photo-MOS-Relay, All Channels Isolated Terminal Type: Screw Terminal (M3 Screw) |
| Alarm Output | Number of Channels: 4 Output Format: Open Collector Output (5 Volts, 10 kΩ Pull-Up Resistance) |
| Storage Devices | Built-in Flash Memory (2 GB) USB Memory Device |
| Sampling Interval | Sampling Interval up to 1 Hour. The Fastest Sampling Rates and the Restrictions: 100ms (10 Times per Second): Up to 10 Channels at a Time 200ms (5 Times per Second): 11 or More Channels at a Time |
| Backup Functions | Setup Parameters: EEPROM Clock: Lithium Battery |
| Clock Accuracy | ±0.002% (50 Seconds per Month) @ 23.0°C |
| Operating Environment | Temperature: 0 to 45°C Humidity: 5 to 85% RH (Non-condensing) |
| Power Source | AC Adapter: 100 to 240 Volts AC, 50/60 Hz (Included) DC Input: (8.5 to 24 VDC; Max. 26.4 Volts)* Battery Pack: 7.4 VDC (2200 mAh)** Note: * With Optional DC Drive Cable (Part # B-514) ** With Optional Battery Pack (Part #B-517). Up to 2 Batteries Can be Attached. |
| Measurement Ranges | Voltage: 20, 50, 100, 200, 500mV; 1, 2, 5, 10, 20, 50V; 1 to 5 Volts FS Thermocouple: Type K, J, E, T, R, S, B, N and W Supported RTD: PT100 (Spec IEC751), JPT100 (Spec JIS), PT1000 (Spec IEC751) Humidity: 0 to 100% (w/ Optional #B-530 Humidity Sensor) |
| Measurement Accuracy | Voltage: >> 0.1% Full Scale Type R Thermocouple: >> 0°C ≤ TS ≤ 100°C: ±5.2°C >> 100°C < TS ≤ 300°C: ±3.0°C >> 300°C < TS ≤ 1600°C: ±(0.05 % of Rdg + 2.0°C) Type S Thermocouple: >> 0°C ≤ TS ≤ 100°C: ±5.2°C >> 100°C < TS ≤ 300°C: ±3.0°C >> 300°C < TS ≤ 1760°C: ±(0.05 % of Rdg + 2.0°C) Type B Thermocouple: >> 400°C ≤ TS ≤ 600°C: ±3.5°C >> 600°C < TS ≤ 1820°C: ±(0.05% of Rdg + 2.0°C) Type K Thermocouple: >> -200°C ≤ TS ≤ -100°C: ±(0.05% of Rdg + 2.0°C) >> -100°C < TS ≤ 1370°C: ±(0.05% of Rdg + 1.0°C) Type E Thermocouple: >> -200°C ≤ TS ≤ -100°C: ±(0.05% of Rdg + 2.0°C) >> -100°C < TS ≤ 800°C: ±(0.05% of Rdg + 1.0°C) Type T Thermocouple: >> -200°C ≤ TS ≤ -100°C: ±(0.1% of Rdg + 1.5°C) >> -100°C < TS ≤ 400°C: ±(0.1% of Rdg + 0.5°C) Type J Thermocouple: >> -200°C ≤ TS ≤ -100°C: ±2.7°C) >> -100°C < TS ≤ 100°C: ±1.7°C) >> 100°C < TS ≤ 1100°C: ±(0.05% of Rdg + 1.0 °C) Type N Thermocouple: >> 0°C ≤ TS ≤ 1300°C: ±(0.1% of Rdg + 1.0°C) Type W Thermocouple: >> 0°C ≤ TS ≤ 2000°C: ±(0.1% of Rdg + 1.5°C) Reference Junction Compensation: ±0.5°C |
| Display | Size: 5.7" TFT Color LCD (VGA 320 x 240 pixels) Formats: Waveform + Digital Values, Waveform Only, Current and Captured Signal Waveform, Digital Values Only |
| A/D Converter | ΣΔ Type; 16 Bits (Effective Resolution: 1/40,000 of Full Range) |
| Data Saving Function | Captured Data: Direct Saving of Data into Flash Memory or USB Memory Device Others: Setting Conditions, Screen Copy |
| Ring Capturing Mode | Function: ON/OFF Number of Capturing Point: 1,000 to 2,000,000 (Size of the Capture Data Will Be Limited to 1/3 of Available Memory) |
| Temperature Coefficient | Gain: 0.01% of FS/°C Zero: 0.02% of FS/°C Note: Occurs When Sampling Speed is 10, 20 or 50 ms |
| Withstand Voltage | Between Input Terminal / Input Terminal: 350V p-p (1 Minute) Between Input Terminal / GND: 350 V p-p (1 Minute) |
| Maximum Input Voltage | Between ± Terminals: 60Vp-p Between Input Terminal / Input Terminal: 60V p-p Between Terminal / GND: 60Vp-p |
| Common Mode Rejection Ratio | At Least 90 dB (50/60 Hz; Signal Source 300Ω or Less |
| Noise | At Least 48 dB (with +/- Terminals Shorted) |
| OS Compatibility | Windows XP, Vista and 7 (32 and 64 Bit Editions) |
| Interface to PC | USB (Full Speed) Ethernet (LAN) |
| Dimensions | 232mm x 152mm x 50mm |
| Weight | 900g (Excluding AC Adapter and Battery) |
GL820 Data Logger Documentation
Quick Start Guide (2.6MB .pdf)
User Manual (15.2MB .pdf)