DO-6800 Dissolved Oxygen Analyzer – High Accuracy & RS485
If you’ve been tracking water quality automation, you know the story: tighter discharge permits, smarter aquaculture, and breweries that want oxygen on a leash. In that swirl, the DO-6800 has been popping up in integrator quotes more often than I expected—partly because it does the basics reliably, partly because it doesn’t fuss.
At heart, the DO-6800 is a micro-computerized online dissolved oxygen and temperature transmitting controller with a large LCD, an English menu that’s actually readable, and multi-parameter display (DO, temp, 4–20 mA output, alarm points). It auto-compensates temperature from 0–60°C, raises alarms on range overrun, and kicks an ON/OFF relay when thresholds are hit. Optional RS‑485 (MODBUS, partial compatibility) is there for SCADA. A small but handy touch: a notepad that stores ~50 measurements. Also: adjustable hysteresis to stop chattering relays, a watchdog so it doesn’t freeze, factory-restore, and a power-down memory spec of >10 years. Origin: No.188, Fengshou Road, Chang'an district, Shijiazhuang City, Hebei Province China 050041.
| Measurement method | Electrochemical or optical probe (sensor-dependent) |
| DO range | Sensor-dependent; typical 0–20 mg/L (≈0–200% sat), real-world use may vary |
| Temperature compensation | Automatic 0–60°C |
| Display & UI | Large LCD, English menu, multi-parameter screen |
| Analog output | 4–20 mA, user-set mapping to DO |
| Digital comms | Optional RS‑485 (MODBUS partially compatible) |
| Alarms/relays | High/low with ON/OFF output; adjustable hysteresis |
| Data notes | Notepad stores ≈50 measurements |
| Protection | Watchdog; power-down memory >10 years; factory-restore |
Aeration control is the big-ticket item—several municipal plants report steadier blower turndown once hysteresis is set sensibly. Aquaculture folks like the notepad for quick spot checks; surprisingly handy during feeding peaks. Brewers? They’re cautious, but a few have used the DO-6800 on CIP return lines to keep oxygen pickup in check.
| Model | Comms | Display/UI | Memory | Notes |
|---|---|---|---|---|
| DO-6800 (Watequipment) | 4–20 mA; optional RS‑485 (MODBUS ≈) | Large LCD, English menu | ≈50 logs | Hysteresis, watchdog, factory-restore |
| Competitor X (budget) | 4–20 mA only | Small LCD | No log | Basic alarms |
| Competitor Y (premium) | 4–20 mA + RS‑485/ETH | Color display | Extended logs | Advanced diagnostics; higher price |
Wastewater aeration: A mid-size plant set DO at 1.8 mg/L with 0.3 mg/L hysteresis. Operators reported steadier blower VFDs and fewer nuisance alarms in the first month.
Aquaculture: Shrimp ponds used the DO-6800 to trigger paddlewheels at low DO. Farm manager told me the onboard notepad was “old-school but convenient” for midnight checks.
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