Product Core Brief
- Model: ZR22G-100-S-K-C-T-T-C-A
- Brand: YOKOGAWA
- Series: EXAxt
- Core Function: In-situ zirconia oxygen measurement for combustion exhaust gases, installed directly into flues without extractive sampling.
- Product Type: Split-Type Zirconia Oxygen Probe
- Key Specs: 1.0m Length | JIS Flange | External Reference Gas | SUS316 | HART7
- Condition: New Surplus / Original
- Serial/Order No.: 3645992201
Product Introduction
YOKOGAWA ZR22G-100-S-K-C-T-T-C-A is a split-type in-situ zirconia oxygen probe from the EXAxt series. This YOKOGAWA sensor installs directly into boiler flues and industrial furnace stacks, eliminating the need for extractive sampling lines and significantly reducing maintenance overhead.
The “-100” suffix indicates a 1.0m insertion length, while “-S” specifies SUS316 wetted material. The “-K” designates a JIS flange standard, and “-C” indicates external reference gas (instrument air) supply. The YOKOGAWA handles sample gas temperatures up to 700°C and supports HART7 digital communication for remote diagnostics and configuration.
Suffix Code Breakdown
| Suffix | Code | Meaning |
|---|---|---|
| Length | -100 | 1.0m insertion length |
| Material | -S | SUS316 wetted material |
| Flange | -K | JIS flange standard |
| Reference Gas | -C | External reference gas (instrument air) |
| Gas Connection | -T | Thread type (verify specific standard) |
| Connection Box | -T | Thread type (verify specific standard) |
| Manual Language | -C | Chinese manual |
| Base | -A | Standard base model |
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Split-Type Zirconia Oxygen Probe |
| Probe Length | 1.0m (-100) |
| Wetted Material | SUS316 (-S) |
| Flange Standard | JIS (-K) |
| Reference Gas | External / Instrument Air (-C) |
| Measurement Range | 0.01 – 100 vol% O2 |
| Sample Gas Temp | 0 to 700°C (up to 1871°C with ZR22P adapter) |
| Sample Gas Pressure | ≤ 250 kPa (≤ 2.5 bar) |
| Response Time | 5 seconds (90% response) |
| Repeatability | ±0.5% F.S. (0–25 vol% O2) |
| Linearity | ±1% F.S. (0–25 vol% O2) |
| Drift | ±2% F.S./month (Zero & Span) |
| Digital Communication | HART7, Modbus TCP, Modbus RTU |
| Output Signal | 4–20 mA DC |
| Heating Time | Approx. 20 min |
Quality Control Process
Every YOKOGAWA undergoes rigorous bench validation before shipment. We verify the internal heater element resistance matches factory specs using precision multimeters. Thermocouple output is checked against a calibrated reference to ensure accurate temperature compensation. We then perform a span gas calibration test using certified reference air to confirm linearity across the 0–25% range. HART communication is verified to ensure self-diagnostics, sensor resistance checks, and remote configuration are fully functional. Units failing any test are quarantined immediately.
Replacement Pitfall Guide
❗ Verify Insertion Length: The “-100” suffix means 1.0m insertion. Measure from the flange face to the centerline of the stack. Too short puts the sensor in a dead zone; too long risks mechanical damage from the opposite wall.
❗ JIS Flange Compatibility: The “-K” suffix specifies a JIS flange. Do not attempt to mate this directly to ANSI or DIN flanges without a proper adapter. Bolt hole patterns differ and will cause gas leaks or unsafe mounting.
❗ External Reference Gas Required: The “-C” suffix means this probe requires an external instrument air supply for the reference gas. Ensure your site has a clean, dry instrument air source with proper flow regulation. Using natural convection on a pressurized stack will cause immediate reading drift.
❗ Heater Burn-In: New or long-stored probes need a controlled heat-up. Do not apply full power to a cold zirconia cell — ramp temperature slowly to prevent thermal shock cracking of the ceramic element.
❗ Converter Pairing: This is a split-type probe. It must be paired with a compatible converter such as the ZR402G or AV550G. Verify your existing converter model and firmware compatibility before ordering.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| Direct | Exact match; verify serial/order no. 3645992201 | ||
| ZR22S-100 | Needs Adaptation | ZR22S is the explosion-proof variant; verify hazardous area classification | |
| ZR202G | Needs Adaptation | ZR202G is integrated type; eliminates external converter but changes mounting | |
| ZR402G | Converter Only | ZR402G is the companion converter/transmitter, not the probe itself |
- Measurement Drift: ±2% F.S./month (Zero and Span)
- Repeatability: ±0.5% F.S. (0–25 vol% O2 range)
- Heating Time: Approx. 20 minutes to operating temperature
Need help pairing this probe with the right ZR402G converter, or sizing the instrument air supply for the “-C” reference gas option? I can walk you through the setup.
