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Uniphos Continuous Emission Monitoring Systems (CEMS)

The Uniphos CEMS is an online analyser for measuring concentration of various toxic gases in industrial process/ boiler stack. Being capable of Auto /remote calibration with digital communication, it provides a complete solution for stack monitoring.

Uniphos CEMS are available based on different technologies depending upon the suitability and users requirement:

Highly sensitive & gas specific Chemiluminescence / Fluorescence based NOX and SO2 Gas Analyzers

Non-Dispersive Infrared (NDIR) based Analyzers

Electrochemical sensor based analyzers




Chemiluminescence Based NOx Stack Gas Analyzer

Chemiluminescence has long been recognized as the best practical analytical method for NOx detection at parts per billion level and with little or no interference from other pollutant gases. When nitric oxide reacts with ozone, nitrogen dioxide in the excited state is produced. These excited molecules return to ground state by emitting light in the region 600-2800nm which is measured using a Photomultiplier tube. The amount of light produced is proportional to the amount of nitric oxide in the sample. Hence the concentration of NO can be determined very accurately.

Measuring range: 0-100 / 0- 1000 / 0-2000 ppm

Resolution: 1 ppm

Measurement based on Chemiluminescence technique
Internal ozone generation
Fast and reliable analysis
On board memory for storage of test results along with time and date
Minimum maintenance
Auto / Remote calibration with calibration gas cylinder

Measurement Method: Chemiluminescence
Display: Touch Screen HMI
Current Output : 4-20 mA
Communications: RS-232 / RS-485 & USB
Data logging : Internal data logging
Operation Temperature : 5°C - 40°C
Power: 230 VAC

Continuous Emissions Monitoring
Combustion efficiency
Vehicle emission
Mobile laboratory

Fluorescence Based SO2 Stack Gas Analyzer

The Uniphos SO2 analyzer is based on UV fluorescence technique, which utilizes measurement of SO2 fluorescence typically in the range of 240-420 nm resulting from the optical excitation of SO2 molecules. The fluorescence intensity is related to SO2 concentration. Suitable techniques are adopted to remove interference from moisture and hydrocarbons to make the analyzer highly specific for SO2 detection.

Measuring range: 0-100 / 0- 1000 / 0-2000 ppm

Resolution: 1 ppm

Highly specific & sensitive technique for SO2 measurement
Comes with moisture and hydrocarbon removal system
Inbuilt zero air generator for instrument zeroing
Auto / Remote calibration with calibration gas cylinder
Minimum maintenance
On board memory for storage of test result along with time and date



Measurement Method: UV Fluorescence
Display: Touch Screen HMI
Current Output: 4-20 mA
Communications: RS-232 / RS-485 & USB
Data logging: Supports Internal data logging
Operation Temperature: 5°C - 40°C
Power: 230 VAC

Continuous Emissions Monitoring
Combustion efficiency
Vehicle emission
Mobile Van/ laboratory

Electrochemical Based Analyzer

Uniphos Stack Gas Analyzer is an online micro controller based system for measuring concentration of various toxic gases in industrial stacks. The analyzer comes with sample conditioning system incorporating dust filters / scrubbers for zero air generation, etc. With a purge system, the instrument can be programmed to periodically purge the sampling probe at required intervals. An inbuilt pump brings the sample from stack to the analyzer. The analyzer also provides Auto/ Remote calibration facility when connected to standard gas cylinder through a calibrator. Modern integrated circuits incorporated in this product provide all required annunciations and data communication to make the analyzer fail safe and user friendly.

Available for SO2, NOx, CO, O2, Cl2, HCL, NH3, etc.

NDIR Based Analyzer

Uniphos NDIR based CEMS are PLC based rugged and reliable system for measuring concentration of various gases from stacks. Non Dispersive Infra-Red technique is highly specific as it chooses gas specific infrared absorption wave length of the target gas by cutting off all other wave lengths. This technique is cost effective and reliable for measurement of gas concentration in parts per million range.

The analyzer comes with sample conditioning system incorporating dust filters / scrubbers for zero air generation, etc. With a purge system, the instrument can be programmed to periodically purge the sampling probe at required intervals. An inbuilt pump brings the sample from stack to the analyzer. The analyzer also provides Auto/ Remote calibration facility when connected to standard gas cylinder through a calibrator. It also provides all required annunciations and data communication protocol to make the analyzer fail safe and user friendly.

Available for SO2, NOx, CO, CO2, etc.

Online Dust Analyzer

An optical instrument designed to measure the concentration of dust or particulate matter suspended in the exhaust gas passing through a duct, stack, or flue; typically the exhaust gas from an industrial combustion process or air filtration system. Online Dust Analyzer uses the innovative Dynamic Detection Principle (DDP) which measures fluctuations in the intensity of a light beam, using a folded beam Transceiver /Reflector arrangement. Increased particulate density in the stack causes the scattered light intensity to increase. When calibrated against reference standards, the intensity of this signal relates directly to the particulate concentration in the stack, and this can be used to display as a reading in mg/m³.

Available for SO2, NOx, CO, CO2, etc.