The 4900 Multigas is an advanced CEMS analyzer engineered for extensive multi-gas measurement applications.
- A comprehensive monitoring system for CEMS gas analysis
- A solution without compromises
- Easy maintenance and lower ongoing expenses
Overview
A Comprehensive Solution for Analysis of Multiple Flue Gas Components
Tailored specifically for Continuous Emissions Monitoring (CEMS) of flue gas, the SERVOPRO 4900 Multigas is capable of providing up to four simultaneous measurements of gas streams. It integrates Servomex’s state-of-the-art sensing technologies with a contemporary digital platform, ensuring next-generation performance while maintaining a low cost of ownership.
The 4900 Multigas is designed to be backwards-compatible with current 4900 installations and employs the same dependable measurement technology, delivering reliable gas analysis alongside the sophisticated digital communications necessary for modern systems.
A Complete Monitoring Solution for CEMS Gas Analysis
In sectors such as power generation, petrochemical, refining, waste incineration, iron and steel, pulp and paper, and cement production, continuous emissions monitoring is mandated by regulations.
The solution should provide exceptional sensitivity and precision when measuring various pollutants and greenhouse gases. Regardless of the application requirements, it is essential to have a solution that is straightforward to install and operate, while also being cost-effective.
A No-Compromise Solution
The 4900 Multigas meets all requirements for a Continuous Emissions Monitoring System (CEMS) through a specialized design and feature set tailored for continuous flue gas emissions monitoring applications.
This compact, small-footprint analyzer integrates seamlessly into the existing systems and, when paired with the appropriate sampling system, provides high-quality multi-gas monitoring of key pollutants and greenhouse gases (% O2, CO2, and CO, along with ppm SO2, NO, CO, CH4, and N2O).
The 4900 Multigas utilizes three sensitive, highly stable, non-depleting technologies to deliver unparalleled measurements you can trust – Paramagnetic, Single-Beam Dual-Wavelength NDIR, and Gas Filter Correlation NDIR.
In addition to its exceptional performance, the 4900 Multigas is equipped with analog/serial outputs and supports digital communication protocols such as Serial Modbus, PROFIBUS, and Ethernet (Modbus TCP/IP) for enhanced flexibility in configuration and setup.
An external NOx converter can be employed to analyze and differentiate between NOx, NO, and NO2.
Simple Maintenance and Reduced Ongoing Costs
In addition to its impressive measurement performance and stability, the 4900 Multigas offers significant cost savings throughout its lifespan. This device is not only designed for straightforward setup and versatile integration, but it also features an auto-calibration function that enables simple, cost-effective remote calibration. The 4900 Multigas facilitates the export of diagnostic values, allowing for the early identification of issues, which supports both preventative and predictive maintenance.
Features and Benefits
The Benefits of Next-Generation CEMS Analysis
The 4900 Multigas is a continuous gas analyzer that offers up to four simultaneous measurements, presenting a highly appealing and economical solution for flue gas analysis.
Meets Key Certifications
When paired with an appropriate sampling system, the 4900 Multigas delivers unmatched MCERT (EN 15627-3) and QAL1 (EN14181) measurements for criterion pollutants and greenhouse gases.
Ready for Systems Integration
Designed for compactness and durability, the 4900 Multigas occupies minimal cabinet space and can be seamlessly integrated into various systems, thereby reducing installation costs.
An Affordable Solution
The 4900 Multigas operates with minimal requirements, made possible by extended calibration intervals due to its ultra-stable, high-performance sensing technologies and automatic calibration features.
Unrivalled Performance
- Manufactured by Servomex, which has over 70 years of experience in innovating and pioneering gas analysis, with thousands of units operating in the field annually
- Non-depleting sensors designed for ultra-stable, precise, and selective measurements
Flexible
- Delivers a comprehensive and uninterrupted emissions monitoring solution for flue gas analysis
- Perfect for monitoring criterion pollutants and greenhouse gases: % levels of O2, CO2, and CO, in addition to ppm levels of SO2, NO, CO, CH4, and N2O
- Ongoing multi-gas monitoring
- Digital communication capabilities for remote access: RS232/RS485 Modbus, PROFIBUS, and Ethernet (Modbus TCP/IP)
Easy to Use
- Compact and streamlined: engineered for seamless integration into current systems and convenient placement within a cabinet
- Automatic calibration feature
- User-friendly icon-based color touchscreen for straightforward device interaction and setup
- USB serial port for data logging and software updates
Low Cost of Ownership
- Decreased continuous operational requirements enabled by the auto-calibration feature
- Prolonged calibration intervals due to the ultra-stable, industry-leading Paramagnetic, SBDW IR, and GFx IR sensing technologies
Benchmark Compliance
- In accordance with Low Voltage, EMC, and relevant EU directives
- Certified to MCERTS EN 15267-1:2009, EN 15267-2:2009, EN 15267-3:2007, and QAL 1 EN 14181: 2014 – O2, SO2, CO, and NO
Specifications
The 4900 Multigas provides precise monitoring of criterion pollutants, greenhouse gases, and reference oxygen.
Source: Servomex
| Gas |
Measurement |
| Oxygen (O2) |
% |
| Carbon dioxide (CO2) |
ppm, % |
| Nitrous oxide (N2O) |
ppm |
| Carbon monoxide (CO) |
%, ppb |
| Sulfur dioxide (SO2) |
ppm |
| Methane (CH4) |
ppm |
Technologies
- Infrared
- Paramagnetic
- Gas Filter Correlation
Certifications
- EN 61010-1: Safety standards for electrical devices utilized in measurement, control, and laboratory settings
- EN 61326-1: Electrical devices intended for measurement, control, and laboratory applications
- EMC requirements
- Category II installation rated as per IEC664
- Certified to MCERTS EN 15267-1:2009, EN 15267-2:2009, EN 15267-3:2007, and QAL 1 EN 14181:2014 – O2, SO2, CO, and NO
Schematics

Image Credit: Servomex
Size
132.5 mm (5.2”) high
481.6 mm (19”) wide
544.2 mm (21.4”) deep
With the expansion chassis, the height is 265.5 mm (10.5”)
Weight
Base unit: approx. 14 kg (30.9 lb)
Expansion chassis base weight: approx. 13.7 kg (302.2 lb)
(weight dependent on the number and type of sensors used)