In addition to the UIs there is an integrated sensor to measure a differential pressure. An air flow is calculated from the differential pressure if an air flow calibration process for this sensor has been successfully performed.
Figure 1: FlowSensor Function Block |
Figure 2: FlowSensor Property Sheet |
Output
Output Name |
Description |
Out Pressure |
The output pressure represents the measured differential pressure. The value range is determined by the measuring range of the pressure sensor. The value may be negative depending on the mounting position. The engineering unit is determined by the global engineering unit configuration selected in the control manager In the SI-System, the engineering unit is Pascal. In the Imperial-System, the engineering unit is inH2O. If the sensor is defective, the value is Null.p> Numeric: 32-bit floating point value, Null |
Out Air Flow |
The air flow is always positive, regardless of whether the differential pressure is positive or negative. Note: The air flow sensor will give air flow even if the box is not calibrated. It will use the default flow calibration factor. The engineering unit is configured via the parameter Air Flow Unit. Numeric: 32-Bit floating point value, Null. |
OutCause |
Different Balancing states are displayed using the Cause output, which leads to a better understanding (ENUM): 1=To be balanced (Air flow balancing is not done). 2=set point balanced (Air flow balancing is done using Setpoint balancing method). 3=Min-Max balanced (Air flow balancing is done using Min-Max balancing method) 4=set point balanced with pre calculated flow calibration factor (Balancing was completed by entering calibrated K factor directly. |
Out Flow tube Status |
Table 1: Output of FlowSensor Function
Parameter Name |
Description |
Air Flow Unit |
The parameter specifies the engineering unit of the output Out Air Flow. In addition, the sensor can be completely deactivated if there are problems with the installation, without having to change the Wiresheet Logic. Enum: 1=CFM (Cubic feet per minute) 2=CM/hr (Cubic meter per hour) 3=Lt/sec (Liter per second) Null=CFM (Cubic feet per minute) |
Table 2: Parameters of FlowSensor Function
Refer to General Description for general information about IRM N4 Function Blocks.