Product Core Brief
- Model: ZR402G-M-E-E-A
- Brand: YOKOGAWA
- Series: EXAxt / ZR402
- Core Function: Processes signals from split-type zirconia probes to measure combustion oxygen levels.
- Product Type: Oxygen Analyzer Converter (Transmitter)
- Key Specs: LCD Touchscreen | M20x1.5 Thread | English Display
- Condition: New Surplus / Original
Product Introduction
YOKOGAWA ZR402G-M-E-E-A is a split-type oxygen analyzer converter designed for precise combustion monitoring. This YOKOGAWA unit processes signals from remote zirconia detectors and outputs standard 4-20mA control signals.
Equipped with a 320×240 LCD touchscreen, the YOKOGAWA allows for easy calibration and trend monitoring. It supports automatic, semi-automatic, and manual calibration modes to ensure continuous measurement accuracy.
Suffix Code Breakdown
| Suffix | Code | Meaning |
|---|---|---|
| Thread | -M | M20x1.5mm conduit connection |
| Display | -E | English language display |
| Language | -E | English manual / interface |
| Base | -A | Standard base model |
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Split-Type Oxygen Analyzer Converter |
| Display | 320×240 Dot LCD Touchscreen |
| Output Signal | 4-20 mA DC (2 points) |
| Digital Comm | HART Protocol |
| Measurement Range | 0.01 to 100 vol% O2 |
| Power Supply | 85 to 264 VAC (50/60 Hz) |
| Ambient Temp | -20 to +55°C |
| Protection Rating | NEMA 4X / IP66 Equivalent |
| Calibration | Auto, Semi-Auto, Manual |
| Enclosure | Aluminum Alloy (Polyurethane Coated) |
Quality Control Process
Every YOKOGAWA leaving our bench is fully validated. We apply 120VAC and verify internal power rails are stable under load. The LCD touchscreen is tested for responsiveness and dead pixels. We simulate a zirconia sensor input to verify 4-20mA output tracking and HART communication. Alarm relays are triggered to confirm proper switching. Finally, we perform a 4-hour thermal burn-in to catch early infant mortality failures.
Replacement Pitfall Guide
❗ Conduit Thread Mismatch: The “-M” suffix means M20x1.5mm metric thread. If your existing installation uses NPT or Pg13.5 fittings, this unit will not thread on without an adapter. Do not force it.
❗ Language Lock: The “-E” suffix locks the interface to English. If your operators require Chinese or Japanese, this unit will cause training headaches. Verify your site language requirements before ordering.
❗ Sensor Pairing: This is a converter only. It requires a compatible detector like the ZR22G or ZR22S. Verify your existing probe model and cable length (max 300m with 1.25mm² cable).
❗ Calibration Gas Setup: The auto-calibration feature requires external calibration gas plumbing. Ensure your site has zero gas and span gas connections properly routed to the converter’s calibration ports.
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 physical condition | ||
| ZR402G-P-E-E-A | Needs Adaptation | Different thread (G1/2); requires conduit adapter | |
| ZR402G-M-J-J-A | Needs Adaptation | Same hardware; Japanese display/language | |
| ZR202G | Not Compatible | ZR202G is integrated type; different architecture |
- Response Time: < 5 seconds (system dependent)
- Output Load: Max 550Ω at 4-20mA
Need help verifying your existing ZR22G probe compatibility or sizing the calibration gas plumbing? I can walk you through the setup requirements.
