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1. INTRODUCTION
This guide is intended for field startup of the AAON Airflow Signal Processor. The full AAON
Outdoor Airflow Measurement System Operation and Maintenance Manual (O&M) can be downloaded
from the AAON website at www.AAON.com.
1.1.
BASIC OPERATION
The AAON Airflow Signal Processor receives a differential pressure signal from the AAON Airflow
Station. This signal is scaled and linearized before being displayed and transmitted out as a 4-20mA, 0-
5VDC, or 0-10VDC signal.
The AutoZero feature corrects any zero offset caused by large ambient temperature changes. The
Temperature Compensation feature compensates the flow signal for density changes caused by
variations in the air temperature. The AAON Temperature Transmitter provides a temperature input
signal to the AAON Airflow Signal Processor for air density calculations.
1.2.
SPECIFICATIONS
1.2.1. Power Supply
20 to 28 VAC/DC
1.2.2. Power Consumption
250mA at 24VAC
175mA at 24VDC
1.2.3. Accuracy
±0.25% full scale
1.2.4. Temperature Input
4-20mA
1.2.5. Process Output Options
0-5VDC
0-10VDC
4-20mA (700Ω maximum load)
1.2.6. High/Low Alarm Relay Outputs
Two single (1 form C) dry contacts rated for:
5 amps at 30VAC/DC
10 amps at 120VAC