Reliable data logging becomes much more valuable when one platform can handle many sensor types, expand to large channel counts, and still remain practical for field and laboratory use. The GRAPHTEC GL860 is designed as an isolated multi-channel data logger with universal input, support for up to 200 channels, faster sampling, and both local and remote data handling functions. GRAPHTEC presents the GL860 as a flexible standalone logger that can grow from small measurement tasks to much larger multi-channel monitoring applications.
One of the biggest strengths of the GL860 is its input flexibility. GRAPHTEC states that voltage, temperature, and humidity can be selected for each input channel, making the unit suitable for mixed measurement environments without forcing every channel into the same sensor type. The voltage range runs from 20 mV to 100 V, temperature measurement supports thermocouples including K, J, E, T, R, S, B, N, and C, and RTD measurement is also supported with the appropriate terminal configuration. For current applications, 4 to 20 mA measurement can be handled using an optional 250 ohm shunt resistor, while humidity measurement is available with an optional sensor powered by the main unit.
The GL860 also includes practical digital capability beyond analog measurement. GRAPHTEC lists logic and pulse inputs on 4 channels, supporting logic input through no-voltage contact, open collector, or voltage input, and pulse measurement for rotation, quantity count, and instantaneous modes. It also provides 4 alarm outputs, allowing alarm signals to be sent when a configured condition occurs on a channel. This makes the GL860 useful not only as a passive recorder, but also as a more active monitoring platform for equipment testing, process observation, and event-driven measurement.
Another major advantage is the terminal flexibility. GRAPHTEC highlights 4 types of input terminals, including a withstand high-voltage high-precision terminal, a 30-channel screwless terminal, a 20-channel screw terminal, and a 20-channel screwless terminal. This gives users a choice between higher precision, higher channel density, screw or screwless connection style, and improved withstand voltage depending on the application. For customers who need the logger to fit different job types instead of one fixed wiring style, this is a strong practical benefit.
Expandability is one of the most important features of the GL860. GRAPHTEC states that the unit can expand from 20 or 30 channels up to a maximum of 200 channels using extension terminals and base units. This makes it attractive for users who may start with a smaller setup but later need broader coverage for environmental chambers, equipment validation, durability testing, multi-point thermal mapping, or process monitoring. The ability to scale within the same platform can reduce the need to switch to a completely different logger as requirements grow.
Sampling speed is another area where the GL860 improves capability. GRAPHTEC specifies that sampling intervals down to 5 ms are achievable when limiting the number of channels in use. The published table shows 5 ms for 1 channel, 10 ms for 2 channels, 20 ms for 4 channels, 50 ms for 10 channels, and 100 ms for 20 channels, with broader channel counts available at slower rates. This gives users flexibility to balance capture speed against channel count depending on whether the priority is fast transient observation or large-scale monitoring.
The GL860 is also built for long-term recording. GRAPHTEC includes built-in 8 GB flash memory and support for SDHC cards up to 32 GB, with example recording durations based on a 2 GB data file. In GBD format, the logger can record for about 15 days at 5 ms, 24 days at 10 ms, 47 days at 50 ms, 54 days at 100 ms, and 366+ days at 1 second and 10 seconds. In CSV format, recording durations are shorter but still substantial for many applications, such as 55 days at 500 ms and 111 days at 1 second. This makes the GL860 practical for both short high-speed capture and long-duration unattended monitoring.
GRAPHTEC also adds several memory-management tools that improve reliability in real use. The ring capture function stores the most recent data in ring memory mode, the relay capture function continuously saves data into multiple files up to 2 GB without losing data until capture stops, and the memory loop function automatically deletes the oldest file before storage runs out. These features are especially valuable for long-running tests and maintenance tasks where the user may not be present to manage storage manually.
Another practical feature is backup and removable storage handling. GRAPHTEC states that the SD card can be hot-swapped during data capture when the sampling interval is 100 ms or slower. The logger can also create backup files periodically and automatically transfer them to either the SD card or an FTP server, with selectable backup intervals of 1, 2, 6, 12, or 24 hours. This adds useful data security for long-duration recording and unattended measurement tasks.
Data integrity is another strong point. GRAPHTEC includes a data file verification function that compares a checksum generated from the recorded file with the checksum stored in the file itself. If the values do not match, the file may have been altered or corrupted. For users working in traceability-focused, validation, or quality-sensitive environments, this helps add confidence in the recorded data.
Remote connectivity is another major benefit of the GL860. GRAPHTEC states that the unit can connect to a PC via USB, wired Ethernet, or optional wireless LAN using the B-568 module. Wireless operation can work in Access Point mode for direct connection or Station mode through a wireless LAN router. The GL860 is also compatible with G-REMOTE, which allows remote control and data capture through a web browser from anywhere with an internet connection, while recorded data can also be backed up to a dedicated cloud server. For users who need remote visibility instead of only local operation, this is a significant advantage. The GL860 also supports Modbus/TCP, allowing data transfer to a PLC and recording start or stop control from the PLC side.
Usability improvements also help the GL860 fit modern workflows. GRAPHTEC highlights functions such as CH copy, which lets users copy settings like input type, range, filter, engineering unit scaling, trigger, and alarm settings across channels. The company also lists alarm history, inter-channel calculation, AUTO span, USB drive mode, and improved web server performance and menu visibility. These features reduce setup time and make the instrument easier to work with when channel counts become large.
From a hardware standpoint, the GL860 is designed as a true standalone logger. GRAPHTEC specifies operating conditions of 0 to 45°C and 5 to 85% RH, power from an AC adapter, DC input from 8.5 to 24 V, and an optional battery pack, with two battery packs supported. This gives users three power-source options, helping the logger fit into bench use, mobile testing, and field deployment. The terminal-inclusive dimensions are approximately 240 × 166 × 52.5 mm or 240 × 158 × 52.5 mm depending on terminal type, with weight around 1010 g to 1035 g excluding AC adapter and battery.
Overall, the GRAPHTEC GL860 is a strong solution for users who need a scalable, isolated, and flexible data logger for mixed measurement work. With universal input, expandability to 200 channels, 5 ms high-speed capture under limited-channel conditions, built-in 8 GB memory, SD card support, backup and verification functions, wired and optional wireless connectivity, and compatibility with G-REMOTE and Modbus/TCP, it offers a practical combination of flexibility, data security, and long-term usability for industrial testing, maintenance, environmental monitoring, and laboratory applications.
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