Operating instructions Gas converter series CG, Version CG-10. (Units after December 2012) 9-2.
-2- Table of content 1 Electrical standards 3 2 Safety instructions 3 3 Warranty 4 Used terms and signal indications 4 5 Introduction 5 6 Application 5 6.1 (Figures 1 & 2 ) Functional diagram, sample tpath details 6 7. Working principle of the conversion 7 .4 7.1 Selection of the appropriate catalyst temperature ............................................................................. 7 8. Technical data table 9. Description 8 9 10. Receipt and storage of goods 10 11.
-3- 1. Electrical standards The electrical standard corresponds to the safety regulations concerning the European standard EN 61010 and DIN 57721 for testing the voltage of heater elements. 2. Safety instructions Please note the following basic safety procedures when using this equipment: • Read these operating instructions carefully before start-up and use of the equipment. The information and warnings given in these operating instructions must be heeded.
-4- 3. Warranty If the equipment fails, please contact M&C directly or else go through your M&C authorized dealer. We offer a one year warranty as of the day of delivery as per our normal terms and conditions of sale, and assuming technically correct operation of the unit. Consumables are hereby excluded. The terms of the warranty cover repair at the factory at no cost or the replacement at no cost of the equipment free ex user location.
- 55. Introduction In combustion processes NOx emissions are frequently present as a mixture of NO and NO2. Regulatory reporting and process control systems often require the measurement of total NOx. Consequently, analytical measurement systems typically require sensitivity to both species. Many analytical systems rely on the chemiluminescent measurement principle. This principal determines NO concentration by accurately measuring the amount of light produced by reaction of NO with ozone to produce NO2.
-6- Figures 1 & 2 Functional scheme of the gas converter type CG-10, normal operation, and in bypass mode A B C D E F G H I J Sample Inlet Sample Outlet Manual Bypass Valve Cartridge Oven Cartridge access knob Control sensor (type K) Limit Sensor (type K) Purge inlet Purge outlet Oven temperature PID controller with undertemperature alarm and overtemperature protection (Limit Controller)
- 7- 7. Working principle of the conversion The conversion of nitrogen dioxide NO2 into nitrogen monoxide NO occurs according to the following reaction equation: 2 NO2 2 NO + O2 The reaction equilibrium is shifted entirely onto the side of the original material NO2. A shift of the equilibrium towards the products and the resultant high product yield can only be achieved subject to a high expenditure of energy, i.e. temperature (100% conversion at temperatures over 600 C).
-8- 8. Technical data (Other models included for comparison) Gas converter series CG® Version CG-2 Version CG-2M Version CG-2H Part No. 50 A 1600 50 A 1500 50 A 1800 Gas inlet non-heated (cold) or heated (hot) non-heated non-heated heated Bypass solenoid valve Temperature of sample gas Temperature range, adjustable — 2x Version CG-2MH Version CG10a 50 A1700 heate d 1x — max. +80 C max. +250 C dew point „dry“ dew point <160 C max. 700 C with 230V max.
The M&C gas converter CG-10 is designed as a compact, userfriendly and easy to service wall mounting unit. Gas connection for sample and purge are through the bottom of the case as shown above. Electrical and signal connections are through conduit entry glands on the bottom right rear of the case as shown. All operating elements are mounted on the front panel of the ; converter for easy access.
- 10 10.Receipt and storage of goods The CG... converter is a completely pre-installed unit. The standard catalyst cartridge supplied is already installed. • Remove the CG... converter and any accessories carefully from the transport packaging immediately after arrival and check the contents of the delivery against the delivery note; • Check the goods for any transport damage and if necessary inform your transport insurer immediately of any damage.
- 11 11.Installation instructions The converter is designed as a 14” W x 5” H x 10” D wall mounting case, with a mount plate on the back wall of the unit. Note! If mounting outdoors, the converter should be installed in an area protected from direct weather, freezing, or direct sunlight. Exposure to the elements will degrade the user controls and may result in corrosion of the case.
- 12 - 12.2 Electrical connections The wrong mains voltage can destroy the device.
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- 1415.Determining the catalyst service life The catalyst service life depends essentially on the following factors: • temperature, • NO2-concentration in the sample gas, • O2-concentration in the sample gas, • gas flow rate. Figures 5 up to 7 show the service life curves of the NO2/NO catalyst depending on above mentioned factors. During the stated service life, conversion is over 95%. If the degree of efficiency falls notably below 95%, the used catalyst cartridge should be replaced (see 16.1).
- 15 - Fig. 5: Catalyst life depending on the NO2-concentration for varying flow rates and an O2-concentration of 10Vol.-% Fig. 6: Catalyst life depending on the NO2-concentration for varying flow rates and an O2-concentration of 21Vol.-% 9-2.
- 16 16. Maintenance Before carrying out maintenance work, make sure that safety measures specific to the installation and process are complied with! Dangerous voltage! Remove mains plug before opening the converter’s housing! The CG... converter does not need special maintenance periods. When replacing the catalyst cartridge, it is advisable to change the seals provided.
- 17 - 16.2 Replacing the O-ring seals We also recommend replacing the adapter’s seals every time that the cartridge is replaced. An O-ring set is packaged with each cartridge shipped as replacement or spare part. Hot catalyst cartridges. Touching the cartridge can lead to very severe burns. Wear protective gloves and safeguard cartridge against unauthorized access! Figure 8 shows schematically the location of the two inside and outside O-ring seals. Fig.
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18.Spare parts list -20- Wear, tear and replacement part requirements depend on specific operating conditions. The recommended quantities are based on experience and are not binding. Converter CG® ... (C) Consumable parts (R) Recommended spares (S) Spare parts Recommend in operation[years] Part No. Description 95 A 9003 Catalyst cartridge CG2-C 95 A 9070 O-ring set for converter CG2 95 A 9057a Heater CG-2; 115/230V, 50/60Hz PM6C1EC-ALAJAAA quantity C/R/S 1 C b.d.* b.d.* b.d.* b.d* b.
