Which statement best describes the digital airflow indicating system?

• A. AIP + one sensor assembly
• B. AIP with two sensor assemblies
• C. Sensor assembly only
• D. AIP only

Answer: (A)

In a digital airflow indicating system, the measurement comes from a sensor assembly and the display or readout comes from the Airflow Indicating Panel (AIP). The sensor provides the actual flow data, and the AIP processes that data and presents it in a readable form for the operator. A single sensor assembly attached to the AIP is enough to give a reliable, calibrated reading and a clear indication of flow.

Having the AIP by itself would not produce any reading, since there’s no sensing element to measure flow. Conversely, using a sensor assembly without the AIP would yield data with no display or user interface to interpret it. A second sensor assembly would only be needed for redundancy or multiple sensing points, which isn’t the standard configuration described here. Therefore, the best description is that the system uses an AIP plus one sensor assembly.