Key Takeaways
- Emerson’s Rosemount QX1400 is a continuous‑gas analyzer built for hazardous‑area installations (ATEX II 2G Ex d IIB H₂ T4, IECEx Ex db IIB+H₂ T4 Gb, and upcoming U.S. Class 1 Div 2).
- It combines paramagnetic O₂ detection with quantum‑cascade‑laser (QCL) direct‑absorption spectroscopy for a broad suite of gases.
- Designed for natural‑gas quality, CEMS, LNG, CCUS, hydrogen‑purity and ethylene‑purity monitoring, the QX1400 delivers ±0.2 % FS O₂ accuracy and ≤0.5 % FS accuracy for most QCL‑measured species.
- Shares the same core measurement engine as the Rosemount QX1000 but adds full hazardous‑location certification and a ruggedized enclosure.
- Expected U.S. certification (Class 1 Div 2, Groups B‑D, T4) by Q4 2026.
Overview
Emerson has launched the Rosemount QX1400 Continuous Gas Analyzer, a next‑generation instrument aimed at continuous monitoring of natural‑gas streams and emissions in environments where explosive atmospheres are a concern. The device inherits the hybrid laser‑based/paramagnetic measurement platform of the proven QX1000, but it is housed in an enclosure that meets the strictest European and global hazardous‑area standards.
Hazardous‑Location Certification
| Region | Standard | Certification Code | Effective Date |
|---|---|---|---|
| Europe | ATEX II 2G | Ex d IIB H₂ T4 | Already granted |
| Global | IECEx | Ex db IIB+H₂ T4 Gb | Already granted |
| North America | NEC/CEC | Class 1 Div 2, Groups B‑D, T4 | Expected Q4 2026 |
These approvals allow the QX1400 to be mounted directly on‑site in offshore platforms, LNG terminals, CCS sites, and hydrogen production plants without additional explosion‑proof housing.
Measurement Technology
Paramagnetic Oxygen Sensor
- Principle: Detects the magnetic susceptibility of O₂ molecules.
- Range: 0 – 25 % vol (full‑scale).
- Accuracy: ±0.2 % FS (±0.05 % vol).
Quantum‑Cascade‑Laser (QCL) Direct‑Absorption Spectroscopy
- Target Gases: CH₄, CO₂, CO, H₂S, C₂H₄, H₂, N₂O, and others (up to 15 species).
- Wavelength Coverage: 7.5 µm – 12 µm (mid‑IR).
- Detection Limits: Sub‑ppm for most gases (e.g., 0.5 ppm for CO).
- Accuracy: ≤0.5 % FS (typical ±0.1 % FS).
The hybrid approach eliminates the need for separate analyzers, simplifying wiring, calibration, and maintenance.
Core Applications
| Application | Why QX1400 Fits |
|---|---|
| Natural‑Gas Quality | Real‑time CH₄, CO₂, H₂S, and O₂ monitoring to meet pipeline specifications (e.g., ≤2 % CO₂, ≤5 ppm H₂S). |
| CEMS | Continuous emissions reporting for NOₓ, CO₂, and CH₄ with compliance to EPA 40‑CFR‑75. |
| LNG | O₂ control (<0.5 % vol) critical for cryogenic safety and product purity. |
| CCUS & Underground Storage | Precise CO₂ and H₂ tracking for leak detection and verification. |
| Hydrogen & Ethylene Purity | Sub‑% level O₂ and impurity detection to protect catalysts and downstream processes. |
Comparison with Rosemount QX1000
| Feature | QX1000 (Non‑hazardous) | QX1400 (Hazardous‑rated) |
|---|---|---|
| Enclosure Rating | IP66, non‑explosion‑proof | ATEX II 2G / IECEx Ex db (explosion‑proof) |
| O₂ Sensor | Paramagnetic, ±0.2 % FS | Same |
| Laser Technology | QCL, 7.5‑12 µm | Same |
| Maximum Gas Count | 12 simultaneous species | 15 simultaneous species |
| Operating Temp. | –20 °C to +50 °C | –30 °C to +60 °C |
| Calibration Interval | 12 months | 12 months (field‑replaceable cells) |
| Price (USD) | Approx. $28,000 | Approx. $35,000 (incl. certification) |
The QX1400’s expanded gas count and rugged housing make it the preferred choice where explosion protection is mandatory, while the QX1000 remains a cost‑effective option for clean‑room or outdoor installations without hazardous atmosphere concerns.
Technical Specifications
- Power: 24 V DC, 2 A max (optional 120/240 V AC).
- Communications: HART, Modbus‑TCP, FOUNDATION Fieldbus, Ethernet/IP.
- Display: 7‑inch LCD, configurable dashboards.
- Diagnostics: Self‑test, sensor‑health monitoring, alarm logging.
- Installation: Panel‑mount, DIN‑rail, or wall‑mount kits.
Bottom Line
Emerson’s Rosemount QX1400 delivers the
