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Differential Signal Online RS485 pH/ORP Controller for Power Plant. Comprehensive Warranty: 1-year warranty with lifetime fee technical support included. IP66 Waterproof Design: Sealed enclosure protects against pollution and corrosive gases. Dual Output Capability: Features two 0/4-20mA current outputs and two SPST relays. RS485 Communication: Supports Modbus RTU protocol with JSON text data format. Multi-Parameter Measurement: Measures pH, ORP, and temperature with high precision. Customization Services: Offers full, minor, and flexible customization from samples or designs. User-Friendly Interface: 3.2-inch LCD screen with Chinese and English language options. Versatile Power Supply: Compatible with 100-240VAC or 18-36VDC power sources.