FlowSensor

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.