This document is about Yokogawa Electric Corporation's ZR22G, ZR402G, ZR202G type direct in situ zirconia oxygen analyzers and high temperature humidity analyzers.
The manual describes Yokogawa's direct‑in‑situ zirconia oxygen analyzers and high‑temperature humidity analyzers, available in separate and integrated configurations. It covers system components, installation, calibration, operation, and maintenance procedures.
Key features include a digital LCD touchscreen, HART digital communication, remote maintenance, replaceable probe heater, and multiple reference‑air supply options. The document provides detailed specifications, wiring guidelines, and safety standards for reliable use in boilers, furnaces, and drying equipment.
| Measurement Range | 0 to 100 vol% O |
|---|---|
| Output Signal | 4 to 20 mA DC (max load 550 Ω) |
| Warm‑up Time | Approx. 20 min |
| Response Time | 90 % within 5 s |
| Sample Gas Temperature (probe only) | 0 to 700 °C |
| Sample Gas Temperature (with high‑temp probe) | 700 to 1400 °C |
| Probe Length Options | 0.15 m to 5.4 m |
| Ambient Temperature Range | -20 °C to +150 °C |
| Power Supply Voltage | 100 V to 240 V AC (85 V to 264 V acceptable) |
| Power Consumption | Max 300 W (≈100 W typical) |
| Maximum Probe‑to‑Converter Distance | ≤300 m (conductor resistance ≤100 Ω) |
The warm‑up time is approximately 20 minutes.
The conductor resistance must be 100 Ω or less, which corresponds to up to 300 m when using a 1.25 mm² cable.