6 Installation Instruction
Rev. 06/2021
55
6.5
Determining the NO
2
/NO
ₓ
Ratio
When the NO
X
sensor is mounted for the first time at the installation location and each time the
NO
X
sensor is replaced, the NO
2
/NO
X
ratio (correction factor K) in the exhaust gas must be deter-
mined at the mounting position of the sensing element. Use a suitable calibrated exhaust gas
analyzer and determine the concentration of nitrogen dioxide (NO
2
) and nitrogen oxide (NO
X
) at
the sensing element's mounting position. The correction factor K results from the following
equation:
When configuring the EasyNO
ₓ
, enter this value in the
NO
X
Setup
view of the respective NO
X
mon-
itor (see section
Preferences
on page 112).
Always determine the NO
2
/NO
X
ratio before screwing the sensing element in for the first time
and avoid repeatedly screwing the sensing element in and out. Also follow the instructions in
the section
Mounting the Sensing Element of NO
ₓ
Sensor P/N 56.03.003
mounting the NO
X
sensor for the first time and the instructions in the section
Replacing the NO
ₓ
Sensor
on page 135 when replacing the NO
X
sensor.
6.6
Installation Locations of Thermocouples
Risk of suffocation! Risk of poisoning!
Leaks in the exhaust pipe can cause exhaust gases to escape and people in
the system room can suffocate or be poisoned. After mounting the sensors,
check the tightness of the exhaust pipe.
To monitor catalyst operation and to detect the dew point for the NO
X
sensor, it is necessary to
install a thermocouple in the exhaust pipe at the catalyst outlet at a suitable location. Only use
type K thermocouples with the measuring point insulated from the housing. When installing the
thermocouples, follow the manufacturer's instructions and ensure that the thermocouples are
positioned centrally in the exhaust pipe.
The following layouts are supported by the EasyNO
ₓ
:
–
Before and after catalytic converter (
Before & After Cat
)
In this arrangement, mount the thermocouples at equal distances before and after the cata-
lytic converter.
Summary of Contents for EasyNOx
Page 1: ...EasyNOX NOX Monitoring Operating Manual P N 01 50 026 EN Rev 06 2021 ...
Page 33: ...4 Product Description Rev 06 2021 33 4 1 7 Overview Drawings 4 1 7 1 Dimensions EasyNOX ...
Page 34: ...4 Product Description 34 Rev 06 2021 ...
Page 35: ...4 Product Description Rev 06 2021 35 CAN Bus NOX Sensor Module P N 63 05 015 ...
Page 36: ...4 Product Description 36 Rev 06 2021 I O Communication Module Optional ...
Page 142: ......
