Yokogawa PH402G-E-1-E PH/ORP Analyzer Transmitter

The Yokogawa PH402G-E-1-E is a panel-mounted pH and ORP analyzer transmitter in the EXA series that converts high-impedance sensor signals into dual 4–20 mA outputs with relay outputs for PLC/DCS integration. It features built-in PI control for dosing or neutralization and enhanced diagnostics and communication capability for robust process control in harsh industrial environments. Key specifications include pH measurement range of approx -2 to 16 and ORP up to ±1500 mV, input impedance around 10¹³ Ω, 110–120 VAC power supply at 50/60 Hz (~10 VA), IP65/NEMA 4X enclosure, and mounting options that include panel, wall, or pipe installations. This is a discontinued legacy EXA analyzer commonly used for continuous online monitoring in wastewater treatment, chemical processing, food and beverage production, and power generation systems.