Preferences
The Preferences button in the main menu of an added NOX monitor opens the NOX Setup view.
Note that changes in this view are not saved and applied by the NOX monitor until you exit the view. Also note that you can only edit the NOX monitoring parameters after you have entered the serial number of the engine to be monitored under Serial Number.
You can make the following settings:
- Mode
Use the drop-down list to set the NOX monitoring mode:- Off
NOX monitoring is disabled. The nitrogen oxide and oxygen readings from the NOX sensor are not recorded. - Recording Only
The nitrogen oxide and oxygen readings from the NOX sensor are recorded, but NOX monitoring is deactivated. - MAP Naturally Aspirated
For normal operation detection of the NOX monitor, the absolute charging pressure of a naturally aspirated engine serves as an indicator for the engine load. For this purpose, a manifold pressure sensor must be connected to input 3 of the respective CAN bus module (see Wiring of Manifold Pressure Sensor, MAP Signal, Load Signal). - MAP Turbo
For normal operation detection of the NOX monitor, the absolute charging pressure of a turbo engine serves as an indicator for the engine load. For this purpose, a manifold pressure sensor must be connected to input 3 of the respective CAN bus module (see Wiring of Manifold Pressure Sensor, MAP Signal, Load Signal). - Load on CAN Module
The NOX monitor detects normal operation by means of the load signal connected to input 3 of the respective CAN bus module (see Wiring of Manifold Pressure Sensor, MAP Signal, Load Signal). - Load via CANopen
The NOX monitor detects normal operation by means of the load signal connected to the analog input of the optional I/O communication module. For this purpose, the function Load Input for NOₓ must be assigned to the analog input of the respective I/O communication module (see Analog Inputs).
- Start/Stop via CANopen
The NOX monitor receives the normal operation release from the master control via a binary signal connected to the binary input of the optional I/O communication module. For this purpose, the function Normal Operation Release for NOₓ must be assigned to the binary input of the respective I/O communication module (see Binary Inputs).
- Scaling Min., Scaling Max.
Via these entries you can specify the measuring value range of the absolute manifold pressure sensor in the NOX monitoring modes MAP Naturally Aspirated and MAP Turbo. Under Scaling Min., enter the measured value of the sensor at 4 mA and under Scaling Max. at 20 mA. The values in-between are interpolated linearly. - MAP < / MAP > / Last / ---
The entry displayed at this point depends on the set NOX monitoring mode:- Load
In the NOX monitoring modes Load on CAN Module and Load via CANopen, you specify the load that indicates the beginning of normal operation of your engine (for example 30 % nominal load as per VDMA 6299:2019-09 or as per the engine manufacturer's specifications). - ---
In NOX monitoring modes Off and Recording Only, normal operation detection is disabled. In the NOX monitoring mode Start/Stop via CANopen, the NOX monitor receives the normal operation release from the master control.
- K
Enter the NO2/NOX ratio of the exhaust gas from your system. The NO2/NOX ratio must be determined at the mounting position of the NOX sensor's sensing element before start-up of NOX monitoring and each time the NOX sensor is replaced. More information on this is available in the section Determining the NO2/NOₓ Ratio. - KNO2
Enter the factor for the corrective calculation of the NOX sensor's NO2 sensitivity. For the correction factor, refer to the entry NO2 Gain in the NOX Sensor view (see section Sensor). - Level Limit
Enter the daily average of the NOX concentration, which must not be exceeded under any circumstances. To use the NOX monitoring of the EasyNOₓ in accordance with standard sheet VDMA 6299:2019-09, enter here the daily average at which an alarm should be triggered. If the daily average exceeds the level limit at the end of a day, the detected normal operation hours are added to the failure hour counter of the ongoing calendar year. The change of day is firmly preset to 0:00 hrs Central European Time (CET) or UTC+1. - Level Warning
Below the configured Level Limit, specify a daily average of the NOX concentration above which the EasyNOₓ will issue a warning. The Level Warning daily average serves to indicate that the daily average is approaching the configured level limit. As a warning threshold, you can specify your currently valid plant-specific limit value. - Time Limit
For the failure hour counter of the NOX monitor, specify a time threshold that the NOX concentration may exceed the configured level limit as a maximum within one calendar year. If this time threshold is exceeded, the EasyNOₓ indicates this in the NOX Monitoring view in the failure hour counter Alm via a red status display. - Time Warning
For the failure hour counter of the NOX monitor, specify a warning threshold to indicate that the failure hour counter is approaching the configured Time Limit. If this warning threshold is exceeded, the EasyNOₓ indicates this in the NOX Monitoring view in the failure hour counter Alm via a yellow status display. - Name
Enter a custom name for the engine to be monitored. This name is displayed in the title area in all views of the respective NOX monitor. - Serial Number
Enter the serial number of the engine to be monitored. This field is mandatory. - Layout
Use the drop-down list to set the layout of the thermocouples (see Installation Locations of Thermocouples):- Before & After Cat
One thermocouple respectively measures the exhaust gas temperature before and after the catalytic converter. - One After Cat
One thermocouple measures the exhaust gas temperature after the catalytic converter.
- Two After Cat
In engines with two exhaust gas lines, one thermocouple after each catalytic converter measures the exhaust gas temperature.
- Overtemperature 1 / 2
Specify respectively the exhaust gas temperature which must not be exceeded in the exhaust pipe at the corresponding measuring point (1=T1, 2=T2). - Undertemperature 1 / 2
Specify respectively the exhaust gas temperature which must not be undercut in the exhaust pipe at the corresponding measuring point (1=T1, 2=T2).
- Min. Δ Temperature, Max. Δ Temperature
If you have selected the layout Before & After Cat for exhaust gas temperature monitoring, you must also specify the permissible temperature difference range of the exhaust gas between the catalyst inlet and outlet. A positive temperature difference stands for a correspondingly higher temperature at the outlet compared to the inlet. A negative temperature difference stands for a correspondingly lower temperature at the outlet compared to the inlet.