The GF-A2000 transmitter accepts one IAT-DI probe or up to two IAT-UI/US probes. The transmitter has two analog output signals. One output signal can be assigned to the average airflow of the connected probes or the airflow of the individual probe connected to “P1” when two IAT-UI/DI probes are used. The second output signal can be assigned to the probe connected to “P2” or the average temperature of the connected probes. A contact closure relay is also provided that can be assigned to one or more of the built-in alarms.