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GL-3000 Liquid Level Datalogger
Level range 0–5, 10, 20, 50, 100, 200 mH₂O
Fully welded stainless steel, submersible
RS485 Modbus-RTU / ASCII protocol
3.6 V lithium battery, 13 µA standby
Stores more than 130,000 measurements
Digital temperature compensation, ±0.05 %FS
The GL-3000 is a fully sealed, submersible liquid level datalogger. A high-stability sensing element and a precision transmitter circuit sit in a single welded stainless steel housing, so the instrument can stay immersed in any medium compatible with its wetted materials.
The sensing element converts hydrostatic pressure into an electrical signal, which is linearised and temperature-compensated digitally before being logged. Readings are stored in internal memory — more than 130,000 records — and retrieved over RS485 using Modbus-RTU or ASCII. The 3.6 V lithium battery keeps the electronics in a 13 µA standby state between acquisitions, which gives long unattended run times.
Typical use is water level and liquid level monitoring in water resources, hydrology and comparable field work, where the logger stays in the well or tank and is read out periodically rather than wired to a control system.
| Level range | 0–5, 10, 20, 50, 100, 200 mH₂O (other ranges on request) |
|---|---|
| Pressure range | -100 kPa ~ 0 … 100 MPa (other ranges on request) |
| Overpressure | 2 × full scale |
| Level accuracy | ±0.05 %FS, ±0.1 %FS |
| Temperature accuracy | < ±0.1 °C at -20 – 80 °C |
| Long-term stability | ±0.2 %FS per year (range > 20 mH₂O) |
| Operating temperature | -10 – 70 °C |
| Storage temperature | -40 – 100 °C |
| Power supply | 3.6 V, 4000 mAh lithium battery |
| Output signal | Modbus-RTU |
| Power consumption | 13 µA standby (typ.), 2.3 mA active (typ.) |
| Housing | Stainless steel 304 (316L, titanium alloy on request) |
| O-ring | FKM (fluororubber) |
| Diaphragm | Stainless steel 316L |
| Outer diameter | 27 mm |
| Overall length | 210 mm |
| Temperature error, range > 10 mH₂O | 0.02 %FS/°C zero · 0.03 %FS/°C full scale |
| Temperature error, range ≤ 10 mH₂O | 0.02 %FS/°C zero · 0.025 %FS/°C full scale |
