PC-6850 Industrial Computer – Fanless, Rugged, High I/O
If you’ve worked around wastewater plants or plating shops, you know pH and ORP control can make or break a shift. That’s why I’ve been watching the PC-6850 closely—double-channel brains in a compact industrial package, from a team building instruments in Chang’an district, Shijiazhuang (No.188, Fengshou Road, Hebei, China 050041). It’s a practical take on continuous pH/ORP measurement and control that fits the gritty realities of water treatment.
Industry trend, quick version: tighter discharge limits, lean staffing, and IIoT dashboards. Plants want one panel to cover more ground. PC-6850 speaks to that—two inputs (pH + ORP or pH+pH), independent control logic, and flexible power (220V AC, 110V AC, 24V AC/DC). To be honest, the low-voltage option alone is a win for retrofits in damp cabinets.
| Measurement ranges | pH 0–14; ORP −2000 to +2000 mV (sensor-dependent) |
| Resolution / accuracy | ≈0.01 pH / ±0.02 pH; 1 mV / ±2 mV (25°C, stable lab buffers) |
| Inputs | Dual channel; temp comp via NTC/PT1000 (optional) |
| Outputs | 2× 4–20 mA (isolated) ≈, 2–4 relays (HI/LO), RS‑485 Modbus (optional) |
| Power | 220V AC, 110V AC, 24V AC, 24V DC (selectable) |
| Enclosure / display | Panel/field mount ≈IP65 front; backlit LCD |
| Compliance | Designed to align with IEC 61326-1, IEC 61010-1; CE/RoHS on request |
Materials and methods: industrial PC/ABS enclosure; pH glass electrodes with ceramic junction; ORP probes typically platinum or gold tips. Calibration follows 2–3 point routines using NIST-traceable buffers (ASTM D1293), with temperature compensation; ORP verification per ASTM D1498 (Zobell or Light’s solution). QC often includes 48‑hour burn-in, EMI/EMC checks (IEC 61326-1), and safety per IEC 61010-1. Typical drift in stable conditions:
Service life: controller 5–7 years in sheltered panels; probes around 12–24 months in municipal wastewater (can be shorter in high-temp or oily streams). To be honest, cleaning and calibration discipline make or break longevity.
Many customers say the PC-6850 is “set-and-check weekly,” which, frankly, is about as good as it gets in harsh sumps.
| Model | Channels | Power options | Outputs | Comms |
|---|---|---|---|---|
| PC-6850 | 2 | 220/110/24 AC, 24 DC | 2×4–20 mA, 2–4 relays ≈ | RS‑485 Modbus (opt.) |
| Competitor A | 1 | 100–240V AC only | 1×4–20 mA, 2 relays | None |
| Competitor B | 2 | 100–240V AC | 2×4–20 mA, relays | RS‑485 |
Options I’ve seen requested: extra-long sensor leads, sealed junction pH probes for oily water, panel vs. wall brackets, isolated analog outputs, and Modbus to SCADA. Some sites add a small DIN gateway to push PC-6850 values to cloud dashboards. It seems the power flexibility (24V DC) simplifies that.
Standards and compliance checkpoints: pH per ISO 10523 / EPA 150.1–150.2; ORP verification per ASTM D1498; controller EMC per IEC 61326-1; safety per IEC 61010‑1; enclosure selection toward NEMA 4X or IP65 fronts where splash is expected. Always ask the supplier for current certificates.
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