Digital guide
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Yokogawa EPH402
Technical Specifications:
- Measurement Ranges: pH: -2.00 to 15.00 pH; ORP: -2000 to +2000 mV
- Temperature Range: -10°C to 130°C (automatic compensation)
- Accuracy: ±0.1 pH (typical)
- Response Time: ≤ 10 seconds
- Output: Isolated 0-1 V DC or 4-20 mA DC; load ≥ 1000 Ω
- Contact Outputs: 4 relay outputs for alarm, control, wash, and fault signals
Detailed content
- Power Supply: 100-240 V AC, 50/60 Hz
- Enclosure: IP65 (dust-tight, water-resistant)
- Mounting: Panel, wall, or pipe mount
- Discontinuation: Officially discontinued January 1, 2004 (replaced by newer models)Yokogawa
Key Features:
- Auto-Diagnosis: Self-checks for electrode aging, faults, and calibration errors
- User-Friendly: Front-panel operation without opening the enclosure
- Flexible Calibration: Automatic and manual buffer recognition
- Wash Control: Integrated control for automatic sensor cleaning systems
- Alarm Functions: High/low limit alarms with configurable hysteresis
Applications:
- Water treatment plants (potable water, wastewater)
- Chemical processing (pH control in reactors)
- Food and beverage (fermentation, quality control)
- Pharmaceutical manufacturing (clean-in-place systems)
- Pulp and paper (bleaching processes)
