YOKOGAWA PH402G-E-1-E PM EXA PH402 ANALYZER TRANSMITTER 4-WIRE

Description:

The Yokogawa PH402G-E-1-E PM EXA pH/ORP Analyzer Transmitter (4-wire) is used a panel-mounted industrial converter designed for continuous measurement of pH and oxidation-reduction potential (ORP) in liquid processes. It converts high-impedance sensor signals into standard 4–20 mA outputs for PLC/DCS integration while providing built-in diagnostics and control functionality. The EXA series is engineered for harsh environments and supports both monitoring and closed-loop control applications.

Applications:

The Yokogawa PH402G-E-1-E is used in industrial environments for continuous online monitoring of pH and ORP in liquid processes. It is commonly deployed in wastewater treatment, chemical processing, food and beverage production, and power generation systems. The analyzer supports measurement, alarm handling, and control outputs for chemical dosing or neutralization, ensuring process stability and compliance.

Technical Specifications:

• Manufacturer: Yokogawa
• Model / Part Number: PH402G-E-1-E
• Product Type: pH / ORP Analyzer Transmitter (4-wire, EXA Series)
• Measurement Range: pH approx. -2 to 16, ORP up to ±1500 mV
• Input: Dual high-impedance sensor inputs (~10¹³ Ω)
• Output Signals: Dual 4–20 mA + relay outputs
• Power Supply: 110–120 VAC, 50/60 Hz
• Power Consumption: ~10 VA
• Control Capability: Built-in PI control (dosing/neutralization)
• Communication: Enhanced diagnostics and communication capability
• Enclosure: IP65 / NEMA 4X industrial housing
• Mounting: Panel mount (PM), wall, or pipe
• Function: Continuous liquid analysis + process control
• Product Status: Discontinued legacy EXA analyzer

Common Replacements:

• Yokogawa FLXA21 pH Analyzer
• Yokogawa FLXA202 pH Analyzer
• Yokogawa PH450G Converter