SERVOMEX · AIR QUALITY MONITORS & GAS DETECTORS

Servomex 4900 Multigas Analyzer

A complete CEMS multigas analyzer for industrial flue gas and emissions monitoring, not a raw sensor.

Manufacturer: Servomex

Technical overview

Measured gases	O₂, CO₂, CO, SO₂, NO, CH₄ and N₂O depending on configuration
Applications	Industrial emissions and process monitoring
Communications	Modbus options, PROFIBUS and Ethernet
Technology	Combined optical and oxygen measurement systems

Manufacturer technical source →

For safety, occupational and compliance decisions, confirm the exact configuration, calibration, instrument certifications and applicable local requirements.

4900 — configurable CEMS and gas span by channel

Servomex 4900 is a configurable industrial multigas analyzer; supported gases including O₂, CO, NO, SO₂ and N₂O require appropriately selected channels, measuring ranges and sample conditioning. A gas appearing in the portfolio is not proof every 4900 includes that analyzer module. For CEMS, calibrate each channel, manage heated sample lines and water/particulate interference, and compare data acquisition/Modbus interfaces with the site’s reporting requirements. A complete analyzer’s regulatory compliance depends on the delivered system and local test standard.

4900 Multigas — CEMS architecture and three physical measurement paths — original technical reference

Model-specific measurement and electrical figures, output options and their source limitations.

Measured feature	Maker data	Practical engineering implications
Instrument class	Cabinet-integrated continuous emission monitoring multigas analyzer	Not a discrete 4-Series OEM gas sensor.
Oxygen principle	Paramagnetic O₂ measurement for percent-volume flue gas	O₂ concentration signal is not calibrated using NDIR hydrocarbon sensor factors.
Infrared systems	Single-beam dual-wavelength NDIR plus Gas-Filter Correlation NDIR	Separate optical analyzers handle configured CO₂/CO/SO₂/NO/CH₄/N₂O mixtures.
Gas family	Percent O₂/CO₂/CO; ppm SO₂, NO, CO, CH₄, N₂O, depending on configured channels	Not all eight gases are present in every supplied analyzer.
NOx interpretation	External NOx converter can determine NO/NO₂ contribution	NO₂ is not automatically measured without correct converter/plumbing option.
Data outputs	Analog/serial, Modbus over RS232/RS485, PROFIBUS and Modbus TCP/IP over Ethernet	Instrument I/O cards and protocol options need procurement verification.
Maintenance	Auto-calibration and diagnostics exported for predictive maintenance	Remote auto-zero/span still requires certified gases and plant acceptance.
Local operation	Touchscreen and USB data/software interface	Confirm cabinet environmental rating and process sample conditioning.

System selection and verification

CEMS accuracy depends not just on optical analyzer selection but on gas sampling conditioning, moisture management, calibration gas traceability, response time, oxygen normalization and actual regional emissions rules. The Servomex 4900 offers combined sensing technologies; calling every configured gas NDIR is incorrect because oxygen is paramagnetic. For NOx, specify whether an external NO₂-to-NO converter exists, its efficiency and drift. Set up lost-sample flow, condensate, calibration overdue and Modbus communications as separate diagnostic alarms rather than interpreting every zero reading as clean emissions.

Primary official specification: Model manufacturer technical documentation. Order suffixes, current revisions, traceable calibration and certifications are subject to final confirmation.

AirAlign manufacturer-specific editorial enhancement · 25 October 2026. Not independent source calibration, site regulatory signoff or finished-safety-instrument certification.