CEM500 Online Gas Analyser
This new model is based on a 2048 pixels CCD (charge-coupled device) giving a higher resolution (0.1 nm) and a longer lamp life time (3 years) It is based on UV spectroscopy that brings a higher sensitivity than infra-red and gives the possibility to measure several gases simultaneously. A high selectivity is achieved by a fast Fourier transform (FFT) on the absorbance spectrum for all the gases having a periodic structure like NH3, SO2, NO and others. All the internal gas circuit is heated at 190°C to admit directly hot and humid combustion gases. The CEM500 is presented in a IP65 wall mounted enclosure. This model may include a heated sampling pump as an option.
Main Method : UV Spectroscopy
- Several gases can be measured simultaneously thanks to the UV spectroscopy method by using different wavelengths and algorithms. For gases with a periodic absorption spectrum such as NH3, SO2, NO, CS2 or acetylene, an algorithm based on FFT (Fast Fourier Transform) guarantees a very good selectivity of measurement. The solid-state design due to the UV spectroscopy gives a high reliability of the measuring system with quite no maintenance.
- The UV lamp is a xenon flash lamp with a high lifetime and without thermal effect that may generate measurement drift.
- The gas flow cell has two quartz windows to transmit the UV light throught the measured gas. The standard path length of the flow cell is 240 mm.
- The spectrograph is based on a concave grating to minimize the optical parts and the spectrum is read on a 2048 pixel CCD with a resolution of 0.1nm.
- A zero is done automatically on zero air or nitrogen with an adjustable period (if possible every 2 or 4 hours but once per day remains acceptable).
- The absorbance spectrum is calculated from the reference spectrum acquired during the zero step.
User-Friendly Interface
A colour touch screen display interface allows the user to easily navigate through a number of screens that are used to set and check all of the operating conditions of the instrument. A protective film limits the risk to damage the surface of the touch screen, especially against solvent and corrosive liquid.
Communication
Recorded data and diagnostic files for each parameter can be downloaded to memory stick thanks to a USB port. This allows to collect easily these files on site without using a computer. The files are in text format and can be directly imported to Excel® for graphic charts.
No Interference with CO, CO2 and CH4
The major emission gases like CO, CO2, and CH4 have no UV absorption, therefore they don’t interfere with the measured gases. H2O has a weak absorption in the UV range but at different wavelengths than combustion gases like NH3, NO, NO2 or SO2. Consequently, H2O, with an usual concentration between 5% and 20%, is not disturbing the measurements.
Low Maintenance and High Reliability
The design has been specially oriented for low maintenance and high reliability on the measurements. The UV xenon lamp is specified for a lifetime of 109 flashes. Therefore, the lifetime is about 3 year with continuous measurements or 10 years with one measurement per minute. This reduces considerably the maintenance and the risk of wrong measurement due to aged lamps or its replacement.
Gas Circuit
Three gas connections are available on the rear panel of the analyser :
Inlet for the sample
Zero air or nitrogen
Outlet for sample or zero
Inlet and zero are connected on a 3 ways electric valve. When the automatic zero is activated, the solenoid valve switches the flow cell on zero air. A pressure sensor takes the pressure of measured gas to compensate it and to give a flow indication. All the gas circuit is in a heated compartment controlled within +/- 0.5 °C at an adjustable temperature between 60°C and 190°C. An optional pump may be included before the gas flow cell in order to pump the sample as well as the zero gas that may be ambiant air for most of the applications.
Multi-Gas Configuration
Several gases can be measured in a same analyser if the sample gas composition is compatible with the selected algorithms and wavelengths. The analyser gives high measurement selectivity thanks to the recognition of the specific UV absorption spectrum of gases by using proprietary algorithms. For Denox applications, special algorythms allow to measure NH3 in a 0-10 ppm range with high level of SO2 up to 1200 ppm like on coal power plants.
Heated Version
The analyser is provided with an heating system for the gas circuit. The heating temperature can be adjusted up to 190°C. The high temperature evaporates any deposits on the windows.
Measuring Time
For process that requires fast measurement like motor bench application, the analyser is able to measure the sample concentration within 200 milliseconds thanks to an ultra fast electronics design based on high speed DSP (Digital Signal Processor). However, usual measurements on emission gases are performed within 5 seconds. A special auto averaging algorithm can be activated to improves the stability without affecting the response time.
Automatic Compensation
An internal measurement of temperature and pressure of the sample is performed. A ratio related to the ideal gas law is applied on the measured value to compensate the effects of temperature and pressure.
CEM500 Dimensional Drawing
This new model is based on a 2048 pixels CCD (charge-coupled device) giving a higher resolution (0.1 nm) and a longer lamp life time (3 years) It is based on UV spectroscopy that brings a higher sensitivity than infra-red and gives the possibility to measure several gases simultaneously. A high selectivity is achieved by a fast Fourier transform (FFT) on the absorbance spectrum for all the gases having a periodic structure like NH3, SO2, NO and others. All the internal gas circuit is heated at 190°C to admit directly hot and humid combustion gases. The CEM500 is presented in a IP65 wall mounted enclosure. This model may include a heated sampling pump as an option.
Online gas analyzer, CEM500 - Parameter Specification
| Parameter | Range* (ppm) | Range* (mg/m3) | Typical Repeatability | Detection Limit |
|---|---|---|---|---|
| NH3 Ammonia |
0-10 ppm 0-100 ppm 0-1000 ppm |
0 - 7 mg/m3 0 - 70 mg/m3 0 - 700 mg/m3 |
0.05 ppm at 10 ppm 0.1 ppm at 100 ppm 0.5 ppm at 1000 ppm |
0.1 ppm |
| NO Nitrogen Oxide |
0-2000 ppm | 0 - 2500 mg/m3 | 1 ppm at 1000 ppm | 3 ppm |
| SO2 Sulfur Dioxide |
0-1000 ppm | 0 - 3000 mg/m3 | 2 ppm at 1000 ppm | 0.5 ppm |
| H2S Hydrogen Sulfide |
0-500 ppm | 0 - 750 mg/m3 | 0.5 ppm at 500 ppm | 0.5 ppm |
| NO2 Nitrogen Dioxide |
0-2000 ppm | 0 - 4000 mg/m3 | 10 ppm | |
| C6H6 Benzene |
0-100 ppm | 0 - 300 mg/m3 | ||
| C7H8 Toluene |
0-30 ppm | 0 - 100 mg/m3 | ||
| C8H10 Xylene |
0-30 ppm | 0 - 150 mg/m3 | ||
| NCL3 Nitrogen Trichloride |
0-100 ppm | 0 - 500 mg/m3 |
Online gas analyzer, CEM500 - General Specification
| Data storage | 5000 measurements for all parameters |
| Interfaces | Interface RS232 (MODBUS, AK)
USB port (for memory stick) Internal WIFI interface IEEE 802.11 B (OPTION) Internal Ethernet 10 BASE-T interface IEEE 802.3 (option) |
| Signals | 1 to 8 analog outputs 4-20 mA opto-isolated (option) 1 to 4 relay contacts programmable (option) |
| Display | LCD colour screen (TFT) with LED backlight 640x480 pixels |
| Power supply | 110-240 VAC/ 1000 VA / 50-60 Hz |
| Operatings limits | 0 to 40 °C, less than 90% as relative humidity |
| CE standards | Electromagnetic compatibility and safety
EN 61010-1, IEC 61010-1 / EN 61326, IEC 61326 |
| Enclosure | Stainless steel IP65 with coating |
| Dimensions | 345 x 525 x 260 mm |
| Weight | 30 kg |
| Sampling gas | Pressure : 0 – 2 Bar Absolute (0 – 2000 hPa Absolute) Flow : 0.1 to 10 l/min Temperature : ambiant to 400 C Fittings : Swagelok, stainless steel 316 for tube OD ¼'' (6.4 mm) |
| Zero gas | Pressure : 0 – 2 Bar Absolute (0 – 2000 hPa Absolute) Flow : 0.1 to 10 l/min Fittings : Swagelok, stainless steel 316 for tube OD ¼'' (6.4 mm) |
This new model is based on a 2048 pixels CCD (charge-coupled device) giving a higher resolution (0.1 nm) and a longer lamp life time (3 years) It is based on UV spectroscopy that brings a higher sensitivity than infra-red and gives the possibility to measure several gases simultaneously. A high selectivity is achieved by a fast Fourier transform (FFT) on the absorbance spectrum for all the gases having a periodic structure like NH3, SO2, NO and others. All the internal gas circuit is heated at 190°C to admit directly hot and humid combustion gases. The CEM500 is presented in a IP65 wall mounted enclosure. This model may include a heated sampling pump as an option.
Online gas analyzer, CEM500 - ACCESSORIES
Sampling Pump
Product Code: PUMP500
Internal membrane pump with heated head
Flow about 6 l/min
Heated version at 190 °C
Input Modules
Product Code: IN4-20
4-20 mA input module
Impedance: 100 Ohm
Input Modules
Product Code:LOGIC500
Double logical inputs module
Input no 2 : measurements inhibition
Isolated 0 –24 V DC inputs
Impedance: >10 Kohm
Output Modules
Product Code:OUT4-20-500
4-20 mA output module
Active output, Max load 500 Ohm
Output Modules
Product Code:RELAY500
4-20 mA output module
Communications
Product Code:WIFI500
Wifi Interface
Standard IEEE 802.11b
Secured data transfer by WEP keys
Communications
Product Code:ETHER500
Ethernet interface
This new model is based on a 2048 pixels CCD (charge-coupled device) giving a higher resolution (0.1 nm) and a longer lamp life time (3 years) It is based on UV spectroscopy that brings a higher sensitivity than infra-red and gives the possibility to measure several gases simultaneously. A high selectivity is achieved by a fast Fourier transform (FFT) on the absorbance spectrum for all the gases having a periodic structure like NH3, SO2, NO and others. All the internal gas circuit is heated at 190°C to admit directly hot and humid combustion gases. The CEM500 is presented in a IP65 wall mounted enclosure. This model may include a heated sampling pump as an option.
Download CEM500 Online Gas Analyser detail
| Description | Type | Language | Size | Download |
|---|---|---|---|---|
| Brochures/ Data Sheet | English | 1008 KB |
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| Dimensional Drawing | English | 312 KB |
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