Overview
The Overview button in the main menu of an added NOX monitor opens the following views:
The
and
buttons allow you to switch between the views.
The views are described as follows.
NOX Monitoring

This view displays the current status of the NOX monitor. The view varies depending on the set NOX monitoring mode. The various parameters of the NOX monitor can be set in the NOX Setup view (see section Preferences). If one of the entries shows the value A, the value is outside of the specified range.
The following information is provided:
- Dew Point
The blue status display shows that the temperature in the exhaust pipe at the catalyst outlet is above the dew point of the NOX sensor. For thermocouple layout Two After Cat (see Preferences), this condition must be met in both exhaust gas lines. - Normal Operation
The green status display shows that normal operation is detected. - 24h Average
This entry shows the provisional daily average of the nitrogen oxide readings since 00:00:00 hrs CET (UTC+1) of the current day converted according to VDMA 6299:2019-09. If the entry is grayed, the conditions for averaging are not met. - Trend
The status display indicates that the provisional daily average of the nitrogen oxide concentration exceeds certain thresholds. In parallel, the NOX monitor signals the threshold exceedance correspondingly via the binary outputs Warning and Error of the EasyNOₓ (see section Devices).- Red: The provisional daily average currently exceeds the configured level limit. The NOX monitor has switched the binary output Error of the EasyNOₓ.
- Yellow: The provisional daily average currently exceeds the configured warning threshold. The NOX monitor has switched the binary output Warning of the EasyNOₓ.
- Gray: The provisional daily average currently does not exceed any of the configured thresholds. The binary outputs Warning and Error of the EasyNOₓ are not switched by the NOX monitor.
- Δ Temperature
This entry shows the current temperature difference of the exhaust gas between the catalyst inlet and outlet. The entry is available if the layout Before & After Cat is set for exhaust gas temperature monitoring in the EasyNOₓ (see section Preferences). The temperature at the catalyst inlet is subtracted from the temperature at the catalyst outlet. The background colors of the entry have the following meaning:- Red: The configured temperature difference maximum is exceeded.
- Blue: The configured temperature difference minimum is undercut.
- White (day mode) or black (night mode): The current temperature difference is within the configured permissible range.
- Nitrogen Oxide Reading Display (Analog)
- Blue pointer
Display of the provisional daily average of the nitrogen oxide readings since 00:00:00 hrs CET (UTC+1) of the current day converted according to VDMA 6299:2019-09 as soon as valid nitrogen oxide readings are available in normal operation.
- Nitrogen Oxide Reading Display (Digital)
In normal operation display of the current nitrogen oxide reading converted according to VDMA 6299:2019-09 - T1, T2
Display of the currently measured exhaust gas temperature at the designated measuring points (see section Installation Locations of Thermocouples). T2 is not available if the layout One After Cat is set for exhaust gas temperature monitoring in the EasyNOₓ (see section Preferences). The background colors of the entry have the following meaning:- Red: The configured overtemperature has been exceeded at the respective measuring point.
- White (day mode) or black (night mode): The currently measured exhaust gas temperature is below the configured overtemperature at the respective measuring point.
- Purple: The measured value is not transmitted via the CAN bus.
- MAP / Load / In 3
The displayed entry depends on the selected monitoring mode. If the background of the respective entry is purple, the measured value is not transmitted via the CAN bus.- MAP
This entry is displayed in the NOX monitoring modes MAP Naturally Aspirated and MAP Turbo and shows the current manifold pressure measured via input 3 of the respective CAN bus module. - Load
This entry is displayed in the NOX monitoring modes Load on CAN Module and Load via CANopen and shows the current load signalled via the respective analog input.
- In 3
This entry is displayed in the NOX monitoring modes Off, Recording Only, and Start/Stop via CANopen and shows the current input current at input 3 of the respective CAN bus module.
- In 4
This entry shows the current input current at input 4 of the respective CAN bus module. If the background of the entry is purple, the measured value is not transmitted via the CAN bus. - NOX
Display of the current nitrogen oxide reading from the connected NOX sensor. If the background of the entry is purple, the measured value is not transmitted via the CAN bus. - O2
Displays the current oxygen reading from the connected NOX sensor. If the background of the entry is purple, the measured value is not transmitted via the CAN bus. - Op
Displays the normal operation hours registered so far by the NOX monitor for the current calendar year. The normal operation hours are registered to the second and rounded down to the hour in the display. - Alm (Alarm)
Failure hour counter, which shows the number of hours that the daily average of the NOX concentration has been above the configured level limit in the current calendar year so far (see section Failure Hour Counter). The failure hours are registered to the second and rounded down to the hour in the display. The background colors of the entry have the following meaning:- Red: The configured time limit of the failure hour counter is exceeded.
- Yellow: The configured warning threshold of the failure hour counter is exceeded.
- White (day mode) or black (night mode): None of the configured thresholds is exceeded.
NOX Trends
In the NOX Trends view, you get information about the current trend of the measured values and the provisional nitrogen oxide daily average for the last 10 minutes. You can hide or show individual trends by using the legend.
The following trends are displayed:
- O2 %
Trend of the oxygen reading from the connected NOX sensor - NOX ppm
Trend of the nitrogen oxide reading from the connected NOX sensor - NOX
Trend of the nitrogen oxide reading converted according to VDMA 6299:2019-09 (see section Conversion of Nitrogen Oxide Readings) in mg/Nm³ - NOX ø
Trend of the provisional daily average of the nitrogen oxide readings since 00:00:00 hrs CET (UTC+1) of the current day converted according to VDMA 6299:2019-09 in mg/Nm³
- T1, T2
Trend of the measured exhaust gas temperatures at the designated measuring points (see section Installation Locations of Thermocouples) - MAP / Load / ---
The displayed trend depends on the selected monitoring mode. MAP displays the trend of the measured manifold pressure in the NOX monitoring modes MAP Naturally Aspirated and MAP Turbo, Load the trend of the signalled load in the NOX monitoring modes Load on CAN Module and Load via CANopen. Three dashes (---) appear in the NOX monitoring modes Off, Recording Only, and Start/Stop via CANopen, and no trend is displayed.