SIEMENS 7MB2337-4AU16-3PT1 Ultramat 23 Oxygen Gas Analyzer

Overview

The Siemens Ultramat 23 (Model 7MB2337-4AU16-3PT1) is a sophisticated solution for complex multi-component gas analysis, designed to monitor more than one critical parameter simultaneously. Unlike basic single-gas analyzers, this variant measures two distinct infrared-sensitive gases—specifically SO₂ and NO—within a compact 19" plug-in unit.

It represents the evolution of process gas analyzers toward higher integration, offering a space-efficient and cost-effective tool for applications where understanding the interplay between multiple flue gas components is key to process optimization and environmental compliance.

1. The Critical Role of Multi-Component Gas Analyzers in Industry

In industrial processes (combustion, chemical production, waste incineration), flue gas composition reveals critical insights into efficiency, safety, and environmental impact. While single-gas analyzers are common, modern applications often demand correlated multi-component data:

For example, simultaneous SO₂ and NO measurement is essential for controlling flue gas desulfurization (FGD) and selective catalytic reduction (SCR) systems.

A dual-component analyzer like the Ultramat 23 delivers synchronized data from one sample point, ensuring consistency for advanced process control—far outperforming disconnected single-point measurements.

2. Core Technology: NDIR in Dual-Channel Design

The analyzer’s core is Non-Dispersive Infrared (NDIR) technology, which relies on the principle that gas molecules absorb infrared light at unique "fingerprint" wavelengths. Its dual-channel design works as follows:

A single infrared light source and shared measurement cell (through which sample gas flows) minimize components.

Sophisticated optical filters separate light, directing it to dedicated detectors for SO₂ (e.g., 7.3 µm) and NO (e.g., 5.3 µm) wavelengths.

The combined gas path is a key feature: both measurements use the identical sample stream (no splitting), reducing leak points and guaranteeing perfectly synchronized readings.

3. Product Specifications and Configuration Flexibility

This model is pre-configured for SO₂/NO measurement but offers flexibility via user-selectable ranges. It uses vpm (volume per million) as the standard unit—ideal for process control, as it is independent of temperature and pressure.

4. Parameter&Specification

Product Name    Siemens Ultramat 23 Gas Analyzer    

Model Number    7MB2337-4AU16-3PT1    

Technology    NDIR (for 2 gases: SO₂ + NO)    

Measurable Gases    SO₂, NO    

Measuring Ranges    SO₂: 0-500 to 0-2500 vpm; NO: 0-200 to 0-1000 vpm    

O₂ Sensor    Without (optional external solution available)    

Mounting    19" Plug-in Unit (3U Height)    

Power Supply    AC 230 V, 50 Hz    

Gas Connections    6 mm stubs    

Internal Pump    No (designed for external sample conditioning systems)    

5. Understanding the Omission of an Integrated O₂ Sensor

The lack of a built-in O₂ sensor is a strategic design choice, tailored to system-level gas analysis needs:

Stable O₂ Environments: In processes where O₂ levels are consistent, a single central O₂ analyzer can serve the entire system (avoiding redundant sensors).

Process Control Priority: When the primary goal is optimizing processes (e.g., DeNOx reactors) rather than regulatory emission reporting (which requires O₂ normalization), an integrated O₂ sensor is unnecessary.

Modular Flexibility: This design lets engineers pair the analyzer with best-in-class O₂ technology (e.g., paramagnetic analyzers) if needed, rather than settling for a basic integrated option.

5. Application Fields: Beyond Simple Emission Monitoring

The dual-component capability makes this analyzer indispensable in:

DeNOx/DeSOx Systems: Provides real-time, correlated SO₂/NO data to optimize reagent injection rates in SCR/FGD systems—maximizing pollutant removal and minimizing operational costs.

Combustion Turbine & Boiler Optimization: Helps fine-tune combustion parameters to reduce simultaneous NOx/SOx formation, boosting efficiency and lowering emissions.

Chemical Process Industries: Monitors SO₂/NO as reactants, by-products, or catalyst health indicators in specialized processes.

Frequently Asked Questions (FAQs)

1. What gas analyzer technologies exist, and where does NDIR fit?

Common technologies: Electrochemical (EC, low-cost O₂/toxic gas); Paramagnetic (PMD, high-accuracy O₂); Laser (TDLAS, fast/specific measurements). NDIR stands out for long-term stability, specificity, and reliability with gases like SO₂/NO—balancing performance and cost for industrial use.

2. Why is a combined gas path beneficial for multi-component analyzers?

A shared path uses fewer parts (reducing leaks) and ensures all measurements use the exact same sample at the same time—critical for accurate process control calculations that rely on correlated data.

3. When should I choose an analyzer without a built-in O₂ sensor?

Opt for this model if O₂ is already monitored by a central analyzer, or if your priority is process control (not regulatory reporting requiring O₂ normalization). It saves cost and adds flexibility.

4. How do I choose between vpm and mg/m³?

Vpm (volumetric ratio) is temperature/pressure-independent—ideal for process control. Mg/m³ (mass concentration) depends on conditions and is often required for environmental compliance. Analyzers can convert between them if temp/pressure data is available.

5. What’s the advantage of a 19" rack-mounted design?

The 19" form factor is an industry standard for control panels/analyzer shelters. It enables neat, modular integration with PLCs, power supplies, and sample systems—simplifying installation, maintenance, and future upgrades.

6. Can SO₂/NO be changed to other gases in the field?

No. Optical filters and detectors are factory-calibrated for specific gas pairs. Field retrofitting is not possible—you must define the target gases when ordering to ensure correct configuration.