Industrial pH Sensor for Water and Wastewater — Modbus RS485
The PRB-PH-RS485-101 is a submersible industrial pH electrode with RS485 Modbus RTU output. Measures pH 0–14 with automatic temperature compensation — suitable for drinking water tanks, STP discharge monitoring, industrial effluent, and agricultural water quality.
Use Cases
- STP / ETP discharge — verify pH of treated effluent before discharge to meet pollution control board norms (typically 6.5–8.5)
- Industrial process water — chemical, pharma, food and beverage, textile effluent
- Drinking water tanks — continuous pH monitoring for potability compliance
- Aquaculture — maintain optimal pH for fish and prawn health
- Agriculture and irrigation — monitor irrigation water pH to protect crop yield
Compatible Gateways
- MOFI5A — WiFi Modbus RS485 bridge: push pH readings to cloud over Wi-Fi
- GLCRTU4G — 4G RTU: remote monitoring without local network infrastructure
- Any third-party Modbus RTU master — PLC, BMS, SCADA, environmental monitoring host
Electrode Replacement
pH glass electrodes are consumable components. Expected service life is 6–12 months depending on the medium. Replacement electrodes are available. Factor this into your project cost — it is standard practice with all industrial pH sensors of this type.
Key Specifications
- Output protocol: Modbus RS485 RTU
- pH range: 0–14 pH
- Resolution: 0.01 pH
- Accuracy: ±0.15 pH
- Temperature compensation: Automatic, 0–80°C (±0.5°C)
- Power supply: DC 10–30V, 0.6W
- Electrode protection: IP68 — fully submersible
- Cable length: 5 metres standard (10 m, 15 m, 20 m available)
- Electrode service life: 6–12 months
- Integration: MOFI5A, GLCRTU4G, any Modbus RTU master