Yokogawa ZR402G-M-E-E-A

Product Name:​ ZR402G Separate-Type Zirconia Oxygen Analyzer Converter
Product Introduction:​ Converter unit of the Yokogawa ZR22G/ZR402G split-type combustion oxygen analyzer system. Pairs with a remote zirconia probe (ZR22G/ZR22S) to measure O₂ in flue gas and deliver 4-20 mA plus HART to DCS/PLC. Now discontinued, replaced by ZR802G class.
Category:
Description
Technical Specifications:
  • Measurement Object: O₂ in combustion exhaust / mixed gas
  • Measurement Principle: Zirconia solid-electrolyte cell (probe side)
  • Range: 0.01 to 100 vol% O₂
  • Output: Two isolated 4-20 mA DC, max load 550 Ω
  • Digital Comms: HART (250-550 Ω loop dependent)
  • Contact I/O: 4 relay outputs (1 fail-safe NO), 2 digital inputs
  • Probe Gas Temp: 0-700 °C (up to 1871 °C with HT adapter)
  • Probe Gas Pressure: -5 to +250 kPa
  • Probe Lengths: 0.15 to 5.4 m selectable
  • Power: 85-264 V AC, 45-66 Hz
  • Ambient (Converter): -20 to 55 °C
  • Enclosure: NEMA 4X / IP66, aluminum housing, outdoor rated
  • Display: LCD touchscreen, English (-E)
  • Cable Entry: M20×1.5 (-M)
  • Calibration: Auto / semi-auto / manual zero-span via touchscreen
  • Repeatability: ±0.5% of span; Linearity ±1%; Drift ±2%/month; T90 ≤ 5 s
    Functional Features:​ Field-replaceable heater/thermocouple in probe, HART remote maintenance, self-diagnostics, oxygen trend display, natural-convection reference air.
    Application Scenes:​ Boiler and furnace combustion control, steel/ceramics/pulp plants, incinerators, petrochemical heaters, CO₂/NOₓ/SOₓ emission reduction.
    Installation Notes:​ Mount converter outdoors on wall; keep signal cable separate from heater power conduit; supply instrument air reference (~50 kPa over furnace pressure, ~1 Nl/min).
    Precautions:​ Probe must reach operating temp before calibration; verify HART loop resistance; do not open live in wet conditions despite IP66.
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