Overview - Johnson Controls - LIT-12014020 - RA-1270 - Airflow Measuring Station - AFMS

RA-1270 Fan Inlet Airflow and Temperature Measurement Station Product Bulletin

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The RA-1270 is an advanced electronic thermal dispersion fan and inlet air measurement device that reports airflow and air temperature. The RA-1270 host reads from one or two sensors and up to 16 additional clients, to collect a maximum of 32 airflow and temperature readings from one or more fans. Each fan has one or two sensors located in the fan’s inlet. The sensor design ensures the lowest pressure drop in the industry as compared to other after-market fan inlet airflow measurement devices.

Each sensor has a heated and passive thermistor. You can connect up to 16 clients to one host with two sensors for each client. You can configure the airflow and temperature information from each sensor to correspond to the installed fan. This feature makes it possible to use only one host as the interface point to process air measurement from multiple fans on one or more air-handling units (AHU) or rooftop units (RTU). The host averages up to 32 sensors on 16 fans when you install and configure the host as one airflow measurement station. The total distance between the host and the sum of all clients is a maximum of 500 feet. The RA-1270 host has a two-line 16 character display for setup and configuration and shows both airflow and temperature.

Figure 1. RA-1270 Fan Inlet Airflow and Temperature Measurement Station