Yokogawa ZR22G / ZR802G Zirconia Oxygen Analyzer

The separate-type analyzer, consisting of the ZR22G detector probe and ZR802G converter, measures oxygen and moisture in high-temperature gas with a zirconia sensor, without drawing a sample. The converter also shows cell EMF and cell temperature; the instrument can be used as an oxygen analyzer or high-temperature moisture analyzer.

Values and features

• 0.01-100% by volume for O2, 0-100% by volume for H2O.
• 90% response time within 5 seconds; repeatability for O2 between ±0.5% and ±1% of full scale.
• The heater assembly in the probe can be replaced in the field.
• Three supply methods for reference gas: natural air circulation, instrument air or pressure-balanced.
• Touchscreen, life diagnosis through sensor resistance check, alarm and measurement logging up to 40 days.
• HART 7, Modbus TCP and Modbus RTU over RS-485.

It is used in boilers, steel reheating furnaces and low-oxygen combustion control, and in moisture applications such as textile dyeing and concrete steam curing.

Choosing ZR22G / ZR802G

Because the converter is a separate unit, the probe sits at the hot point and the display in an easy-to-read place. An integrated version of the product is offered separately in the ZR202 family to reduce wiring, piping and installation costs.

Tetra selects the probe length and reference gas method according to the stack design; commissioning, verification with calibration gas and replacement of the zirconia cell and heater are carried out by local service.