YOKOGAWA ZR22G, ZR402G split zirconia oxygen/humidity analyzer

YOKOGAWA ZR22G, ZR402G split zirconia oxygen/humidity analyzer

Product Core Information

（1） Product positioning and application

Core functions: Oxygen concentration measurement (0.01-100 vol% O ₂), high temperature and humidity measurement (0-100 vol% H ₂ O or 0-1.000 kg/kg), supporting combustion efficiency optimization and pollutant emission control.

Application scenarios: Combustion control (energy-saving), high temperature and humidity monitoring (efficiency improvement), as well as CO ₂, SOx, NOx emission reduction (environmental protection) for industrial boilers, heating furnaces, dryers and other equipment.

（2） Core components and model differentiation

1. Core host components

Component model type, core function, key parameters

ZR22G detector directly measures oxygen/humidity in sample gas, universal type (sample temperature 0-700 ℃), high temperature type (0.15m probe, matched with ZO21P adapter, 0-1400 ℃); Probe length 0.15-5.4m (humidity analyzer does not include 0.15m)

ZR402G converter signal processing, display and control 320 × 240 point LCD touch screen; Power supply 100-240V AC; Support HART protocol; Output 4-20mA DC signal

2. Key auxiliary equipment

Calibration related: ZA8F flow setting unit (manual calibration), ZR40H automatic calibration unit (timed automatic calibration), ZO21S standard gas unit (simple calibration).

Protection related: ZO21R probe protector (anti dust wear), ZH21A dust protector (only for humidity analyzer), K9471UA detector dust filter (anti-corrosion dust).

High temperature adaptation: ZO21P high temperature probe adapter (compatible with ZR22G high temperature type, capable of withstanding 1400 ℃), E7046EC/EN high temperature auxiliary injector (for negative pressure scenarios).

3. Switching of oxygen/humidity analyzer

Oxygen analyzer: default configuration, ZR402G converter combined with ZR22G detector.

Humidity analyzer: Select the "/HS" option code for ZR402G, only supports specific probe lengths (excluding 0.15m), sample gas pressure limit -5 to 2kPa.

（3） Core technical parameters

Measurement type, measurement range, accuracy index, response time, output signal

Oxygen concentration 0.01-100 vol% O ₂ repeatability ± 0.5% -1% (depending on the range); Linear ± 1% -3% (based on range) 90% response ≤ 5 seconds 4-20mA DC (maximum load 550 Ω)

Humidity (volume fraction) 0-100 vol% H ₂ O repeatability ± 1 vol% H ₂ O (sample gas pressure ≤ 2kPa) - Same oxygen concentration output

Humidity (mixing ratio) 0-1.000 kg/kg - Same oxygen concentration output

System configuration and installation specifications

（1） Three standard system configurations

1. System 1 (Simple Monitoring)

Composition: ZR22G detector+ZR402G converter+ZO21S standard gas unit.

Applicable scenarios: simple scenarios such as small boiler oxygen concentration monitoring and food production humidity monitoring.

Features: No need to fix the reference airway, calibration gas is temporarily connected through a hose, easy to operate.

2. System 2 (Manual Precision Calibration)

Composition: Core components+ZA8F flow setting unit+zero gas cylinder+pressure reducing valve+air setting unit.

Applicable scenarios: Accurate control of oxygen/humidity in large boilers and heating furnaces.

Features: The reference air is clean and dry air (21 vol% O ₂), which supports manual precise adjustment of calibration air flow rate and higher measurement accuracy.

3. System 3 (Automatic Calibration)

Composition: Core components+ZR40H automatic calibration unit+combustible gas detection contacts.

Applicable scenarios: Large industrial furnaces and kilns that require long-term stable operation and reduced manual intervention.

Features: Automatic calibration is performed at preset intervals (up to 255 days), and the heater power is cut off when the combustible gas detection signal is triggered, providing higher safety.

（2） Installation Core Requirements

1. Environmental requirements

Detector: ambient temperature -20-150 ℃, no corrosive gas, no vibration, avoiding radiation heat effects.

Converter: ambient temperature -20-55 ℃, humidity 0-95% RH (non condensing), away from direct sunlight (optional sunshade).

2. Installation specifications

Probe installation: When the length is ≤ 2m, it can be installed horizontally to vertically, and when it is ≥ 2.5m, it needs to be installed vertically (± 5 °); High temperature SiC probes must be installed vertically.

Flange specifications: Supports JIS, ANSI, DIN and other standards. During installation, it is necessary to ensure that the flange gasket does not block the reference gas outlet (pressure compensation type).

Protective measures: Dust environments require the installation of dust filters/protectors; Suitable probe adapters and injectors are required for high-temperature scenarios.

（3） Wiring specifications

1. Cable requirements

Detector signal: 6-core shielded cable (two-way resistance ≤ 10 Ω); Heater: 2-core cable; Temperature resistance ≥ 80 ℃.

Wiring principle: separate signal cables from power/heater cables to avoid interference; Shielding layer connected to converter FG terminal.

2. Key wiring types

Power and grounding: The converter supplies 100-240V AC power, and the protective grounding resistance is ≤ 100 Ω.