PC-6850 Industrial PC – Fanless, Rugged, High Performance
Water plants and plating shops keep telling me the same thing: compliance windows are tightening while crews are shrinking. That’s where the PC-6850 sneaks in as an unglamorous hero—dual channels, pH and ORP, one compact head unit. It’s built in Hebei, China (No.188, Fengshou Road, Chang'an District, Shijiazhuang City, 050041), and it leans into practical utility rather than buzzwords. To be honest, that’s refreshing.
The PC-6850 is a dual‑channel online controller that continuously measures and controls pH and ORP. Think municipal wastewater, chemistry lines, textile dyeing, pulp and paper, pharma rinse stages, electroplating, and general environmental protection. It supports multi-standard power: 220V AC, 110V AC, and safe low‑voltage 24V AC/DC—handy when your panel has strict low‑voltage rules.
| Measurement channels | 2 (pH + ORP) simultaneous |
| pH range / resolution / accuracy | 0.00–14.00 pH; 0.01 pH; ±0.02 pH (≈; real‑world may vary) |
| ORP range / resolution | −2000 to +2000 mV; 1 mV |
| Temp compensation | Auto/manual; NTC/PT1000 (typical) |
| Analog outputs | 2× 4–20 mA isolated (≈500 Ω load) |
| Digital comms | RS‑485 (Modbus RTU) |
| Control relays | 2–4 SPDT (dose/alarms; model‑dependent) |
| Power supply | 220V AC / 110V AC / 24V AC / 24V DC |
| Enclosure | Panel mount; front IP65 (≈) |
| Display | Backlit LCD, multi‑line |
Materials and methods:
- Controller housing: industrial ABS with gasketed face (impact‑resistant).
- Electrodes: glass pH electrode + platinum ORP electrode, low‑noise cable, BNC or sealed connectors.
- Calibration: 2‑ or 3‑point pH (4.01/7.00/10.01 buffers); ORP with Zobell or Light’s solution (≈231/475 mV).
Testing standards followed on deployments: ISO 10523, ASTM D1293, EPA 150.1 for pH; traceable buffer solutions (NIST).
Service life: controller 5–8 years; pH probes 12–18 months; ORP probes 18–24 months (depends on temp and fouling).
“Set it, walk away, and it just keeps trimming the dose,” one operator told me; another mentioned the PC-6850 “plays nicely with our Modbus SCADA—no drama.” I guess that’s the best compliment a controller can get.
| Model | Channels | Outputs | IP/front | Best for |
|---|---|---|---|---|
| PC-6850 | 2 (pH+ORP) | 2×4–20 mA, RS‑485, relays | IP65 (≈) | Municipal + industrial retrofits |
| Generic Brand A | 1 | 1×4–20 mA; no RS‑485 | IP54 | Budget single‑loop |
| Brand B (mid‑range) | 2 | 2×4–20 mA; RS‑485 | IP65 | OEM panels |
- Power: pick 220/110 VAC or 24 VAC/DC to match your panel.
- Sensor chemistry: low‑ionic, high‑temp, or foul‑resistant pH probes; ORP platinum or gold depending on oxidants.
- Cable length and mounting kits for open channels or inline tees.
- Output map: assign 4–20 mA to pH or ORP; set relay deadbands.
Municipal WWTP: After swapping to the PC-6850, a 30% cut in caustic use was logged over 90 days—mostly due to tighter deadbands and faster relay response. Textile dyehouse: ORP interlock prevented overdosing sodium hypochlorite on reclaim, reducing complaints about residual chlorine odor.
Certifications typically required: CE (EMC/safety per IEC 61326/61010‑1), RoHS. In factory acceptance tests we ran: pH linearity 4.01→7.00→10.01 showed ±0.01–0.02 pH deviation at 25 °C; ORP repeatability on Zobell at 231 mV was within ±3 mV. Your mileage will vary with temperature and fouling, obviously.
If you need straightforward dual‑loop control with flexible power and SCADA‑friendly outputs, the PC-6850 punches above its price class. Not flashy—just reliable.
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