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Codel - Model GCEM4000 -Multi-Channel In-Situ Flue Gas Analyser
The GCEM4000 is a multi-channel flue gas analyser that uses Non-Dispersive Infrared Absorption (NDIR) technology. It provides high accuracy, low maintenance measurement of all the key combustion process emissions to atmosphere. It is capable of operating in very high dust loading conditions, up to several gm/m3 of dust. Its performance can be verified automatically or manually on demand by the injection of zero and span protocol gases into the probe sample chamber. The GCEM4000 is MCERTS certified and satisfies QAL1 of the EU Standard EN14181 for LCPD emission limit values above 40ppm.
- Up to seven gas species
- 0-400 deg C, higher temperatures available
- CO, CO2, NO, NO2, SO2, HCL, CH4, H2O
- Analogue and serial digital output
- ppm, mg/m3 (measured) and mg/Nm3 (normalised)
In-situ, low maintenance devices for continuous process and emissions monitoring.
- Multi-species infrared absorption analyser - Accurate, reliable and low maintenance technology
- In-situ stainless steel probe measurement - No sample lines required
- Gas temperature and pressure sensors - On-board normalisation to standard reference conditions
- Auto routine calibration - Zero calibration by air, span calibration using audit gas
- Analogue and serial outputs - Export of data to SCADA, DCS and historian systems
The GCEM4000 in-situ multi-gas analyser is CODEL’s industry-proven continuous emissions monitor.
Three decades of development, knowledge and practical experience have been utilised to produce this advanced-technology gas analyser which gives complete flexibility of use on process or emissions applications whilst delivering superb accuracy and repeatability at a very competitive price.
The multi gas analyser uses an infra-red detector to measure hot exhaust gases without sampling or modification inside a porous probe positioned directly in the gas stream. The 316 stainless steel probe has been designed for the harshest stack conditions. It enables trouble-free measurement to be made even in very high dust level processes exceeding several gram/m3.
Designed for use primarily on combustion processes, the GCEM4000 measures key pollutants such as CO, NO, NO2, NOx, SO2, CH4, HCl, N2O, CO2 and H2O using infra-red spectroscopy to ensure that there is no cross sensitivity from other contaminants in the gas stream.
Fully automated zero and span calibrations are performed using clean dry compressed air and protocol gas mixtures to provide long-term confidence with minimal maintenance. A locally mounted electrical/pneumatics CEMS Control Panel controls the manual, automatic or remote injection of zero and span gases directly into the measurement chamber. The CEMS Control Panel also provides a convenient location for on-site mounting of other associated electrical / pneumatic equipment. Manufactured with an integral thermo-electric peltier cooled weather cover to ensure a stable operating temperature for the sensing head in all climate conditions from -20°C to +50°C.
The GCEM4000 analyser is available with either a single species measurement for simple process control or with multiple species for complex emissions monitoring.
All models are fitted with probe-mounted:
temperature sensor
absolute pressure sensor
If H2O and CO2 (or separate O2) are measured, the analyser can compute fully normalised data directly in mg/Nm3.
The GCEM4000 CEMS Control Panel houses all auxiliary equipment necessary for the correct function of the analyser. These include: power; input/output connections; purge air supplies; gas calibration pneumatics and the Station Control Unit (SCU).
The epoxy-coated, mild steel enclosure is designed for outdoor use and sealed to IP55 or IP66 . It is perfectly suited for installation at the stack alongside the GCEM4000 Analyser.
Site power is connected via a power isolator and distributed to various functions within the Panel using individual miniature circuit breakers. 48V DC is generated in the Panel for the CODEL Station Control Unit (SCU) and the Analyser.
The SCU is essentially the system computer which controls the flow of data to and from the analyser, initiates zero and span gas calibrations (either automatically or on demand) and produces the current outputs, relay outputs and serial communications. A separate, dedicated RS232 port allows an engineer to connect a portable laptop PC to the SCU to commission the entire system.
The SCU is designed with plug and play PCB cards offering complete flexibility for input and output options.
A compact Air Dryer Unit is installed inside the panel to condition the site compressed air until it is clean, oil-free and dry to – 20 deg C. Other integral pneumatic devices control the clean air to the GCEM4000 probe for purging and for zero gas calibrations. There is also a facility for introducing protocol gases to the probe to verify the performance of the Analyser.
CODEL CEMS Control Panels can be custom designed to incorporate other CODEL analysers such as dust and flow monitors along with other manufacturers’ oxygen analysers. This ensures the installation is compact and electrical and mechanical works are kept to a minimum.
- Gas Species Options: Maximum 7 gases from: CO | NO | NO2 |NOx | N2O | SO2 | HCl | CH4 and CO2. Gas temperature pressure and H2O for data normalisation are standard.
- Measuring units: ppm | mg/Nm³ | mg/m³ | %
- Response Time: Less than 200 Seconds (T90)
- Ambient Temperature: -20°C to +50°C
- Power supply: 48V DC from CEMS Control Panel
- Construction: Corrosion resistant epoxy coated aluminium housing sealed to IP66
- Analogue outputs: 4-20mA current outputs for each gas channel supplied isolated. 500O load max fully configurable from software.
- Logic Outputs: up to 8 x volt-free SPCO contacts 50V 1A max. Configurable as alarm contacts | 1 x volt-free SPCO contact 50V 1A max for data valid signal
- Serial Data: RS232