M&C CG Series User manual

Gas Converter CG®
CG-2/-2M, CG-2H-W/-2MH-W
Instruction Manual
Version 1.04.00

2 CG-2 | 1.04.00 www.mc-techgroup.com
Dear customer,
Thank you for buying our product. In this instruction manual you will find all necessary information about
this M&C product. The information in the instruction manual is fast and easy to find, so you can start
using your M&C product right after you have read the manual.
If you have any question regarding the product or the application, please don’t hesitate to contact M&C
or your M&C authorized distributor. You will find all the addresses in the appendix of this manual.
For additional information about our products and our company, please go to M&C’s website www.mc-
techgroup.com. There you will find the data sheets and manuals of all our products in German and
English.
This Operating Manual does not claim completeness and may be subject
to technical modifications.
© 12/2018 M&C TechGroup Germany GmbH. Reproduction of this doc-
ument or its content is not allowed without permission from M&C.
CG®is a registered trade mark.
Version: 1.04.00

www.mc-techgroup.com CG-2 | 1.04.00 3
Table of Contents
1General information.................................................................................................................. 5
2Declaration of conformity......................................................................................................... 5
3Safety instructions.................................................................................................................... 6
4Warranty.................................................................................................................................... 6
5Used terms and signal indications.......................................................................................... 7
6Introduction............................................................................................................................... 9
7Application ................................................................................................................................ 9
8Operating principle of the conversion................................................................................... 11
8.1 Selection of the appropriate catalyst material..................................................................... 12
8.2 Selection of the appropriate catalyst temperature.............................................................. 12
8.3 Cross sensitivities and influence of interfering/carrier gas.................................................. 13
9Technical data......................................................................................................................... 15
10 Description.............................................................................................................................. 16
11 Receiving the CG…................................................................................................................. 18
12 Storage .................................................................................................................................... 18
13 Installation instructions.......................................................................................................... 18
14 Supply connections................................................................................................................ 19
14.1 Hose/tube connections ...................................................................................................... 19
14.2 Electrical connections........................................................................................................ 20
15 Starting-up............................................................................................................................... 21
16 Closing down .......................................................................................................................... 22
17 Determining the catalyst service life ..................................................................................... 22
17.1 Check of the efficiency....................................................................................................... 24
17.2 Conversion ppm --> mg/m3................................................................................................ 24
18 Maintenance............................................................................................................................ 25
18.1 Replacing the catalyst cartridge......................................................................................... 25
18.2 Replacing the o-ring seals ................................................................................................. 26
18.3 Checking for gas-tightness ................................................................................................ 27
19 Use of the temperature controller.......................................................................................... 28
19.1 Display and function keys.................................................................................................. 28
19.2 Operating state of the temperature controller..................................................................... 28
19.3 Changing the parameters of the temperature regulator...................................................... 29
19.4 Reset of the controller........................................................................................................ 30
20 Trouble shooting..................................................................................................................... 31
21 Spare part list.......................................................................................................................... 32
22 Appendix ................................................................................................................................. 32

4 CG-2 | 1.04.00 www.mc-techgroup.com
List of Illustrations
Figure 1 Functional diagram of CG-2 and CG-2M..........................................................................10
Figure 2 Functional diagram CG-2H-W and CG-2MH-W................................................................ 10
Figure 3 Notch to differentiate the two cartridge types ...................................................................12
Figure 4 CG-2 and CG-2M.............................................................................................................16
Figure 5 CG-2H-W and CG-2MH-W............................................................................................... 16
Figure 6 Pin configuration in the sub-D-plug X2............................................................................. 20
Figure 7 Catalyst life time depending on the NO2 concentration for varying flow rates and an
Oxygen concentration of 5 vol%...................................................................................... 23
Figure 8 Catalyst life time depending on the NO2 concentration for varying flow rates and an
Oxygen concentration of 10 vol%.................................................................................... 23
Figure 9 Catalyst life time depending on the NO2 concentration for varying flow rates and an
Oxygen concentration of 21 vol%.................................................................................... 23
Figure 10 Adapter for catalyst cartridge with handle......................................................................... 26
Figure 11 Wiring plan CG-2M, Drawing No.: 2224-5.04.0 ................................................................ 33
Figure 12 Wiring plan CG-2MH-W, Drawing No.: 2224-5.04.4.........................................................34
Figure 13 Wiring plan CG-2H-W, Drawing No.: 2224-5.04.5............................................................35

www.mc-techgroup.com CG-2 | 1.04.00 5
Head Office
M&C TechGroup Germany GmbH Rehhecke 79 40885 Ratingen Germany
Telephone: 02102 / 935 - 0
Fax: 02102 / 935 - 111
E - mail: [e-mail]
www.mc-techgroup.com
1 GENERAL INFORMATION
The product described in this manual has been built and tested in our production facility.
All M&C products are packed to be shipped safely. To ensure the safe operation and to maintain the
safe condition, all instructions and regulations stated in this manual need to be followed. This manual
includes all information regarding proper transportation, storage, installation, operation and mainte-
nance of this product by qualified personnel.
Please follow all instructions and warnings closely.
Please readthis manualcarefully before commissioning and operating the device. If you have any ques-
tions regarding the product or the application, please don’t hesitate to contact M&C or your M&C au-
thorized distributor.
2 DECLARATION OF CONFORMITY
CE - Certification
The product described in this operating manual complies with the following EU directives:
EMV-Instruction
The requirements of the EU directive 2014/30/EU “Electromagnetic compatibility“ are met.
Low Voltage Directive
The requirement of the EU directive 2014/35/EU “Low Voltage Directive“ are met.
The compliance with this EU directive has been examined according to DIN EN 61010.
Declaration of conformity
The EU Declaration of conformity can be downloaded from the M&C homepage or directly requested
from M&C.

6 CG-2 | 1.04.00 www.mc-techgroup.com
3 SAFETY INSTRUCTIONS
Please follow these safety directions and instructions regarding installation, commissioning
and operation of this device:
Read this manual before commissioning and operating the product. Make sure to follow all safety in-
structions.
Installation and commissioning of electrical devices must be carried out only by qualified skilled person-
nel in compliance with the current regulations.
The installation and commissioning of the device must conform to the requirements of VDE 0100 (IEC
364) ‘Regulations on the Installation of Power Circuits with Nominal Voltages below 1000V’ and must
be in compliance with all relevant regulations and standards.
Before connecting the device, make sure to compare the supply voltage with the specified voltage on
the product label.
Protection against damages caused by high voltages:
Disconnect the power supply before opening the device for access. Make sure that all extern power
supplies are disconnected.
Operate the device only in the permitted temperature and pressure ranges. For details please refer to
the technical data sheet or manual.
Install the device only in protected areas, sheltered from sun, rain and moisture. The product should not
be exposure to the elements.
The converter CG.. is NOT certified to be installed or operated in explosive hazardous areas.
Installation, maintenance, inspections and any repairs of the devices must be carried out only by quali-
fied skilled personnel in compliance with the current regulations.
4 WARRANTY
In case of a device failure, please contact immediately M&C or your M&C authorized distributor.
We have a warranty period of 12 months from the delivery date. The warranty covers only appropriately
used products and does not cover the consumable parts. Please find the complete warranty conditions
in our terms and conditions.
The warranty includes a free-of-charge repair in our production facility or the free replacement of the
device. If you return a device to M&C, please be sure that it is properly packaged and shipped with
protective packaging. The repaired or replaced device will be shipped free of delivery charges to the
point of use.

www.mc-techgroup.com CG-2 | 1.04.00 7
5 USED TERMS AND SIGNAL INDICATIONS
DANGER!
This means that death, severe physical injuries and/or important ma-
terial damages will occur in case the respective safety measures are
not fulfilled.
W ARNING!
This means that death, severe physical injuries and/or important ma-
terial damages may occur in case the respective safety measures
are not fulfilled.
CARE!
This means that minor physical injuries may occur in case the re-
spective safety measures are not fulfilled.
CARE !
Without the warning triangle meansthat a material damage may occur
in case the respective safety measures are not met.
ATTENTI ON!
This means that an unintentional situation or an unintentional status
may occur in case the respective note is not respected.
NOTE!
These are important information about the product or parts of the op-
erating manual which require user’s attention.
SKILLED STAFF
These are persons with necessary qualification who are familiar with
installation, use and maintenance of the product.
Risk of fire hazard!
Highly flamable materials are present. There is an imminent fire haz-
ard.
High voltages!
Protect yourself and others against damages which might be caused
by high voltages.
Wear protective gloves!
Working with chemicals, sharpe objects or extremly high tempera-
tures requires wearing protective gloves.
Wear safety glasses!
Protect your eyes while working with chemicals or sharpe objects.
Wear safety glasses to avoid getting something in your eyes.
Wear protective clothes!
Working with chemicals, sharpe objects or extremly high tempera-
tures requires wearing protective clothes.

8 CG-2 | 1.04.00 www.mc-techgroup.com
Hot surface!
Contact may cause burn! Do not touch!

www.mc-techgroup.com CG-2 | 1.04.00 9
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
NOx consisting of nitrogen monoxide NO and nitrogen dioxide NO2is prescribed by law in Germany and
many other countries.
7 APPLICATION
The M&C gas converters CG... convert the NO2content 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 indirectly 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 sec-
ond 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 without
bypass valves.
The M&C gas converters CG-2 and CG-2M… are designed as compact, user-friendly and easy to ser-
vice 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 theappropriate catalyst filling andthe possibility of adjusting the cartridge temperature optimally
to the catalytic reaction by means of an electronic temperature controller provides a wide range of ap-
plications for the M&C gas converter CG... .
Version
19“-plug-in
Wall mounting
Bypass
‘Hot gas’-Conver-
sion
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

10 CG-2 | 1.04.00 www.mc-techgroup.com
Figures 1 and 2 show the functional scheme of the gas converter type CG..
A Temperature Status Alarm
B Connection for Power Supply
C Sample Gas Inlet
D Sample Gas Outlet
B 1.0 Temperature Controller
B 1.1 Temperature Alarm
B 1.2 Temperature Display
E 1 Tube Furnace
Y 1 3/2-Way-Solenoid-Valve (not with version CG-2)
Y 2 3/2-Way-Solenoid-Valve (not with version CG-2)
Figure 1 Functional diagram of CG-2 and CG-2M
A Temperature Status Alarm
B Connection for Power Supply
C Sample Gas Inlet
D Sample Gas Outlet
B 1.0 Temperature Controller
B 1.1 Temperature Alarm
B 1.2 Temperature Display
E 1 Tube Furnace
E2 Heating bar sample gas inlet and outlet
and Y1
Y 1 3/2-Way-Solenoid-Valve
(not with version CG-2H-W)
Figure 2 Functional diagram CG-2H-W and CG-2MH-W
D
C
A
B
Y2
Y1
E1
°C
350
350
B 1.2
B 1.1
B 1.0
CG-2
CG-2M

www.mc-techgroup.com CG-2 | 1.04.00 11
8 OPERATING PRINCIPLE OF THE CONVERSION
The conversion of nitrogen dioxide NO2into nitrogen monoxide NO passes according to the following
reaction equation:
2 NO22 NO + O2
The reaction equilibrium is shifted at room temperature 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 as
subject to a high-energy input, i.e. increase of temperature.
A nearly 100 % conversion of NO2and therefore a complete conversion to NO is achieved with a car-
tridge filled with a metal catalyst within a temperature range of 620 to 680 °C [1148 to1256 °F].
The energy input can be reduced explicitly by using a carbon-molybdenum based catalyst. With this
type of catalyst, a nearly complete conversion of NO2to NO is achieved within a temperature range of
320 to 380°C [608 to 716 °F].
The catalyst is supplied as a ready-to-use formatted cartridge.
NOTE!
Dust-loaded gases may choke up the catalyst filling. For this reason, an ap-
propriate gas conditioning system is to be mounted upstream of the convert-
ers CG... in order to separate out suspended particles!
NOTE!
For converters with unheated sample gas in- and outlet at dew points above
10 °C [50 °F] a sample gas drying/cooling shall be provided!
To minimize the loss of NOxin the sample gas conditioning, according to DIN EN 14792:2005 (descrip-
tion of the NOxreference measuring method) the usage of sample gas coolers is not allowed in case
the NO2fraction is higher than 10 % of the NOxcontent (note: because of the high solubility of NO2).
If the dew point simultaneously is higher than 10 °C [50 °F], a converter with heated in- and outlet has
to be used (‘hot gas converter’).

12 CG-2 | 1.04.00 www.mc-techgroup.com
8.1 SELECTION OF THE APPROPRIATE CATALYST MATERIAL
For the conversion, as noted preliminary, two catalyst materials are available.
As a standard material, a carbon-molybdenum mixture type C is used as catalyst. The carbon support-
ing material guarantees optimal contact between the gas to be converted and the surface of the catalyst
combined with a simultaneously low flow resistance.
The catalyst type C, operated within a flow range of 30 … 60 Nl/h, is able to convert NO2concentrations
up to 200 ppm to NO, achieving conversion ratios of >95 %. If necessary, the operating temperature of
the converter has to be raised within the admissible range.
NOTE!
For catalyst type C no oxygen in the sample gas as well as in the test gas is
necessary. A calibration with test gas NO2in N2is possible.
Alternatively, to type C, a cartridge with metal filling type SS is available. It is possible to convert NO2
concentrations of up to 2000 ppm into NO. A temperature adaption might also be necessary.
Figure 3 Notch to differentiate the two cartridge types
NOTE!
For catalyst type SS, oxygen in the sample gas as well as in the test gas
(> 1 vol% O2) is necessary. A calibration with NO2in N2is not possible.
8.2 SELECTION OF THE APPROPRIATE CATALYST TEMPERATURE
The converter with carbon-molybdenum cartridge filling is pre-adjusted to 350 °C [662 °F] in the factory.
In case of a metallic cartridge filling, the converter temperature is adjusted to 660 °C [1220 °F]. The
catalyst temperature can be adjusted continuously using the temperature controller on the front of the
converter (see chapter 18.2).
NOTE!
Depending on the gas composition and the flow temperature can be
adjusted and optimised within a certain level:
320 to 380°C [608 to 716 °F], type C respectively
620 to 680°C [1148 to 1256 °F]. type SS.
Type SS

www.mc-techgroup.com CG-2 | 1.04.00 13
NOTE!
High NO2-concentrations, especiallyin connectionwith high flow ratios
need higher operating temperatutres of the converter, in particular the
start up process of the maximum values.
NOTE!
High operating temperatures of the converter, especially the start up
process of the maximum values leads to an increased abrasion of con-
verter components, in particular sealing- and oven-components!
DANGER!
The maximum allowable operating temperature for catalyst type C is
380 °C [716 °F). Temperatures above 400 °C [752 °F] lead to a combus-
tion of the converter material. Urgent fire danger !
DANGER!
The maximum allowable operating temperature for catalyst type SS is
680 °C [1256 °F]. Temperatures above 680 °C [1256 °F]. can lead to a
destruction of the catalyst resp. converter!
8.3 CROSS SENSITIVITIES AND INFLUENCE OF INTERFERING/CARRIER GAS
From operating experiences in different applications as well as laboratory measurements with differrent
CG-converter- and catalyst types we got a lot of experiences about influencing factors on the NO2-NO
conversion process. The following hints make no claim to be complete, but can help choosing the ade-
quate catalyst type as well as give an indication for the integration of the CG-converter into a certain
system environment.
In practice, often several influencing factors have any effect at the same time. With their effect on the
NO2- conversion they are possibly interacting and therefore can complicate an explicit interpretation of
a certain device performance.
NOTE!
Carbon monoxide (CO)
In the conversion process from NO2to NO carbon monoxide is generated or
destroyed (oxydised). The hereby resulting CO-concentration downstream the
converter depends on: catalyst type, NO2-concentration, O2-concentration in
the sample gas and can be some 10 ppm.
Therefore, a CO-measurement should not be installed downstream the con-
verter but with a separate sample gas way to avoid faulty measurements.
NOTE!
Oxygen (O2)
In the conversion process, oxygen is generated proportional to the NO2con-
centration. This fact can lead to a faulty measurement in a downstream oxygen
trace measurement (ppm)!

14 CG-2 | 1.04.00 www.mc-techgroup.com
NOTE!
Sulfur dioxide (SO2)
In the operating temperature range of the catalyst type SS of >600 °C [1112 °F]
existing concentrations of sulfur dioxide are partially destroyed (oxydised).
This fact can lead to faulty measurements in a downstream SO2-measurement.
The exact loss of concentration depends proportional on the oxygen concen-
tration of the sample gas and can be up to 25 % from the basic value.
Therefore, a SO2-measurement should not be installed downstream the con-
verter with catalyst type SS but with a separate sample gas way.
NOTE!
Ammonia (NH3)
In the operating temperature range of the catalyst type SS of >600 °C [1112 °F]
existing concentrations of ammonia are almost completely transformed into
NO if –as required for type SS- enough oxygen is in the sample gas. In the
operating temperature range of the catalyst type C around 350 °C [662 °F],
Ammonia in concentrations >100 ppm can alloy the NO2-No conversion.
NOTE!
Nitrous Oxide (N2O)
There was no influence of this gas detected on the NO2conversion with cata-
lyst type C or SS.

www.mc-techgroup.com CG-2 | 1.04.00 15
9 TECHNICAL DATA
Converter Series CG ®
CG-2
CG-2M
CG-2H-W
CG-2MH-W
Part-No. Converter
50A1600(a)
50A1500(a)
50A1900(a)
50A1920(a)
Part-No.Converter cartridge Type
CCarbon-Molybdenum
95A9003
Part-No.Converter cartridge Type
SS metallic Filling
95A9004
Gas inlet and –outlet non-heated
(cold) or heated (hot)
Non-heated
Non-heated
Heated
Heated
Bypass solenoid valves
--------
2 x
--------
1 x
Gas inlet temperature
Max. +80 °C [176 °F],
dew point “dry“
Max. +250 °C [482 °F],
dew point <160 °C [320 °F]
Temperature range, adjustable
Max. 680 °C [1256 °F]
Gas flow rate
30 to 60 Nl/h, max. 90 Nl/h
Operating pressure
Max. 2 bar abs. (pressure deviations only with max. 0.1 bar/min)
Warm-up time
Approx. 30 min.
Volume of the converter cartridge
Approx. 35 cm3
Operating temp. converter car-
tridge type C
Min. 320 °C [608 °F] typ. 350 °C [662 °F] max. 380 °C [716 °F]
Operating temp. converter car-
tridge type SS
Min. 620 °C [1148 °F] typ. 660 °C [1220 °F] max. 680 °C [1256 °F]
Max. NO2concentration
200 ppm (type C), 2000 ppm (type SS) at new catalyst
Conversion rate NO2in NO
Effectiveness > 95 % for a new catalyst
Service life of the NO2/NO catalyst
Change as a preventive measure every 6 months for type C**
Change as a preventive measure every 12 months for type SS**
Differential pressure
< 20-60 mbar depending on type
Ambient temperature
+10 to +50 °C [50 to 122 °F]
Storage temperature
-25 to +65 °C [-13 to 149 °F]
Relative air humidity
< 80 %
Connection sample gas inlet and
outlet
PVDF-fitting G1/4 i DIN 228/1
ø6 mm tube fitting, 1.4571*(316Ti*)
Power
230 V 48-62 Hz
or 115 V 48-62 Hz (a)
230 V 48-62 Hz
or 115 V 48-62 Hz (a)
Power consumption
520 W
620 W
940 W
Electrical connections
Mains power plug connector incl. 2 fine fuses 5 x 20 mm,
230 V / 3.15 ATT or 115 V / 6.3 AT,
2 m [approx. 6.56 ft] cable with shockproof plug.
Alarm- and control signals 9 pin Sub-D-connector
Status signals for temperature
1 Contact potential free, max. contact rating 24 V, 1 A
Material of sample contacting parts
Stainl. Steel SS316Ti, PTFE, FPM, PVDF
Stainl. Steel
SS316Ti, PTFE,
FPM, PVDF, alu-
minium hard-
coated
Degree of protection
IP20, EN 60529
Housing
19" rack mounting,
3U, depth 350 mm [13.78”]
Wall mounting,
height 350 mm [13.78”], depth 3U
Weight
Approx. 6 kg [13.23 lb]
Electrical equipment standard
EN 61010, EN 60519-1
Option for CG-2 and CG-2M
Mounting bracket, 3U –84HP, Part No.: 50A3000
* Standard ø 6 mm connection, optional ø ¼“ – please indicate with order.
** The indicated service life of 6 respectively 12 months is the minimum service live of the catalyst material under
normal conditions and in not highly corrosive, reducing or oxidizing atmospheres. The operator is responsible for
checking and, if necessary, adjusting the life cycles.

16 CG-2 | 1.04.00 www.mc-techgroup.com
10 DESCRIPTION
Figure 4 shows the conversion unit version CG-2 and CG-2M in the 19”-rack housing.



Back view



= status alarm temperature sub-D-plug 9 pole
= mains connection, apparatus plug
= sample gas outlet, G1/4“i
= sample gas inlet G1/4“ with CG-2/-2M
= sample gas inlet 6mm tube connection*
with CG-2H/-2MH
* Standard
10 (0.39”)
7 (0.28”)
44
(1.73”)
260 (10.24”)
325 (12.8”)
483 (approx. 19”)
435 (17.13”)
465.6 (18.33”)
120
(4.72”)
ø6mm

350
350
G1/4"i
Converter
CG
!
!
57
(2.24”)
132,5
(3HE)
(5.22”)


Figure 4 CG-2 and CG-2M
Figure 5 shows the conversion unit versions CG-2H-W and CG-2MH-W in a wall mounting housing.
Figure 5 CG-2H-W and CG-2MH-W
(5.71“)
(18.78“)
(18“)
(9.65“)
(10.43“)
(8.07“)

www.mc-techgroup.com CG-2 | 1.04.00 17
The M&C gas converters type CG-2 and CG-2M are designed as compact, user-friendly and easy to
service 19" plug-in units

(figure 4) suitable for mounting in 19" cabinet systems. When fitted with the
optional mounting bracket with a vertical swivel-holder (50A3000), the converters can also be wall-
mounted.
The M&C gas converters type CG-2H-W and CG-2MH-W are executed in a compact, user-friendly and
easy to service manner for wall mounting

(figure 5).
All operating elements are mounted on the front panel of the converter for easy access. These are:
-Mounting adapter with handle for the catalyst cartridge

;
-Temperature controller with digital temperature display/temperature alarm

;
-Selector switch for bypassing the catalyst cartridge

(only versions CG-2M/-2MH-W).
The catalyst cartridge is mounted in a heat-insulated tube furnace. The special mounting adapter

on
the front plate respectively on the above housing side of the converter allows the hot catalyst cartridge
to be released and removed without tools being needed.
The converter temperature is electronically controlled and can be set continuously at the temperature
controller

on the converter's front panel respectively above housing side within a range between +50
°C [122 °F] and +680 °C [1256 °F], depending on the catalytic reaction (see chapter 18.3).
An alarm for excessively high and low temperatures is provided as a status contact output at the 9-pin
sub-D-plug

(terminals 5 and 9) on the rear side of the converter.
With the version CG-2M and CG-2MH-W internally or externally controlled PVDF 3/2-way bypass sole-
noid valves allow the catalyst to be bypassed, for example for test purposes. The desired sample gas
path is selected internally via the switch

on the converter's front panel or can be switched externally
via the 9-pin sub-D-plug located on the rear of the converter (see chapter 13.2). Two green LED’s con-
firm the sample gas path selected:
internally:
Switch position "up" - upper LED lights up green - sample gas path selected via bypass
Switch position "down" - lower LED lights up green - sample gas path selected via catalyst
Only for version CG-2MH-W:
Switch position "up" - upper LED lights up green - sample gas path selected via catalyst
Switch position "down" - lower LED lights up green - sample gas path selected via bypass
The supply-connectionsare located on the rear or on the upper and lower side of the converter housing.
These are:
-9-pin sub-D-plug

(necessary for operation of the device, see chapter 13.2),
-connection socket for shockproof plug

-sample gas outlet G 1/4"

,
-sample gas inlet G 1/4"

with CG-2/-2M and
-sample gas inlet, 6mm tube connection (standard) with CG-2H-W/-2MH-W.
The built-in ventilator in conjunction with the ventilation slots in the converter's side panels respectively
cover provide the necessary ventilation.

18 CG-2 | 1.04.00 www.mc-techgroup.com
11 RECEIVING THE CG…
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 imme-
diately of any damage.
12 STORAGE
Cartridges should not be stored for more than 1 year. Storage must be vibration-free and dry.
NOTE!
The converter should be stored in a protected frost-free room!
13 INSTALLATION INSTRUCTIONS
The converter housing of the versions CG-2 and CG-2M is designed as a 19" unit and is also suitable
for wall-mounting or mounting plate by using a special mounting bracket. The versions CG-2H-W and
CG-2MH-W are executed as wall mounting housing.
NOTE!
Because of the system of protection IP 20 (EN60529) the converter has to be
built into a protective cabinet respectively housing. When mounting outdoors,
the converter must be installed in a protective housing, frost-free in winter and
adequately ventilated in summer. Direct sunlight is to be avoided.
In order to avoid the re-oxidation of NO to NO2 in long sample lines, the con-
verter must be mounted in the immediate vicinity of the gas-analyser if possi-
ble.
The converter should be installed away from sources of heat and in a position
which allows air to circulate freely in order to avoid any heat accumulation.
To avoid a heating-up of other devices in case of a 19”-rack, we recommend a
minimum mounting height of 4U.

www.mc-techgroup.com CG-2 | 1.04.00 19
14 SUPPLY CONNECTIONS
14.1 HOSE/TUBE CONNECTIONS
The gas inlet and outlet hoses/tubes of versions CG-2/-2M are connected on the rear of the converter.
Here, the standard executions provides G 1/4" threaded joints. The versions CG-2H-W/-2MH-W as wall
mounting execution with heated sample gas inlet and outlet are equipped with a 6 mm tube connector
of stainless steel.
The appropriate tube or hose threaded joint connections are available optionallyfrom M&C.
NOTE!
Do not confuse hose/tube connections for sample gas inlet and out-
let; the connections are labelled accordingly!
Check for tightness after connection!
When connecting the sample gas supply hoses or tubes to the corresponding threaded connections,
pay attention to the following points:
NOTE!
The tightness of the connections can only be guaranteed if the end
section of the connection hose/tube is flat (use a hose-cutter)!
•Loosen the sleeve nut of the clamping-ring threaded joint by turning to the left. Take care that the nut
is removed carefully from the body of the threaded joint to avoid losing the clamping ring which is
mounted loose in the nut.
•Push the sleeve nut over the connection hose/tube.
•Push the clamping ring respectively the pressure and the cutting ring onto the connection hose/tube
with the thicker bulge pointing to nut.
•Push the hose/tube onto the supporting nipple in the threaded joint.
•Tighten the sleeve nut by hand.
The hose/tube is now mounted in such a way that it cannot slip and is resistant to pressure.
Connecting a heated sample line with an inner tube of PTFE to the converters CG-2H-W/-2MH-W, a
respective insert is absolutely necessary.

20 CG-2 | 1.04.00 www.mc-techgroup.com
14.2 ELECTRICAL CONNECTIONS
The wrong mains voltage can destroy the device. When connecting,
take care that the mains voltage corresponds with the information
provided on the type identification plate!
NOTE!
For the erection of power installations with rated voltages up to
1000 V, the requirements of VDE 0100 and relevant standards and
specifications must be observed!
A main switch must be provided externally.
The main circuit is equipped with a fuse corresponding to the nomi-
nal current (over current protection); for electrical details see tech-
nical data.
The converter is connected to the mains at the rear respectively the lower side of the converter housing
via a shockproof plug with 2 meter [approx. 6.56 ft] connecting cable (X1, see circuit diagram in the
appendix).
The general status alarm for signalling temperatures outside the permitted range and the facility for
connecting the solenoid valves externally are provided at the 9-pin sub-D-plug on the rear or lower side
of the converter housing.
NOTE!
Correct functioning of the converter is only guaranteed when the sub-D-plug
X2 is mounted!
Figure 6 shows the pin configuration in the sub-D-plug X2.
1 2 3 4 5
6 7 8 9
Common status alarm:
1 x NO, potential free
Contact rating: 24 V, 1 A
Catalyst
Bypass
internal control
external control
Figure 6 Pin configuration in the sub-D-plug X2
Contacts 5 and 9 are provided in the sub-D-plug to ensure sure signalling of temperatures outside the
permitted range (see figure 6). This involves a potential-free make-contact with a switch rating of 24 V,
1A. The alarm is signalled if temperatures exceed the permitted temperature range by ±5 °C [±9 °F].
The versions CG-2M and CG-2MH-W have got solenoid valves switching between the sample gas
paths. The valves can be controlled either internally or externally by the customer (see figure 6).