M&C TechGroup CG-2H-W_-2MH-W Operator's manual - Manual (Page 8)

8
Gas sampling and conditioning technology 9-0.2-ME
6 INTRODUCTION
In combustion processes, such as, for example, in large furnaces in which the nitrogen dioxide content
amounts to more than 5% of the nitrogen oxide emission, continuous measurement of nitrogen oxide
NO
x
consisting of nitrogen monoxide NO and nitrogen dioxide NO
2
is prescribed by law in Germany
and many other countries.
7 APPLICATION
The M&C gas converters CG... convert the NO
2
content of the sample gas by catalysis into NO. To do
this, the sample gas is conducted through a special stainless steel cartridge with a catalyst-filling
based on carbon-molybdenum. This conversion makes it possible to measure nitrogen oxides indi-
rectly using all commercially available NO-selective measurement instruments.
The converter is available in four versions: CG-2 and CG-2M
with non heated gas inlet for „cold gas“
conversion and versions CG-2H-W respectively CG-2MH-W with heated gas inlet and outlet and a
second internal heating circuit for „hot gas“ conversion.
For test purposes, the catalyst can be bypassed via two 3/2-way solenoid valves out of PVDF with
version CG-2M and one solenoid valve out of stainless steel with version CG-2MH-W. The solenoid
valves can be controlled internally or externally. The versions CG-2 and CG-2H-W are delivered with-
out bypass valves.
The M&C gas converters CG-2 and CG-
2M… are designed as compact, user-friendly and easy to
service 19" plug-in units for mounting in 19" cabinet systems or with a mounting bracket for wall-
mounting.
The M&C gas converters CG-2H-W and CG-2MH-W are executed as a wall mounting unit easy to
mount.
The catalyst cartridge is filled and formatted at the works and is ready for use immediately. The ability
to select the appropriate catalyst filling and the possibility of adjusting the cartridge temperature opti-
mally to the catalytic reaction by means of an electronic temperature controller provides a wide range
of applications for the M&C gas converter CG... .
Version 19“-plug-in Wall mounting Bypass „Hot gas“-
Conversion
CG-2 x optional
CG-2M x optional x
CG-2H-W x x
CG-2MH-W x x x
Table 1 Summary of possible versions