Technical specifications - Johnson Controls - LIT-12014020 - RA-1270 - Airflow Measuring Station - AFMS

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

Johnson Controls
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Product Bulletin
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Table 1. RA-1270 Fan Inlet Airflow and Temperature Measurement Station technical specifications
Specification Description
Standoff mounted sensors One or two sensor assemblies for each fan are cantilever-mounted to the face of the fan for correct positioning of the sensor into the airstream.
Sensor distribution You can mount up to two sensor assemblies for each fan. When you use two sensor assemblies for each fan, position the sensors opposite each other at the fan inlet.
Note: On dual inlet fans, you only require two sensor assemblies to sample the flow from the entering airstream.
Sensor accuracy Airflow ±3%
Temperature ±0.10°F (0.056°C)
Sensor ranges Airflow rate 0 fpm to 10,000 fpm
Temperature -25°F to 140°F (-32°C to 60°C)
Humidity 0 RH to 99% RH, noncondensing
Host or client, one for each two sensors or fan location Daisy-chain clients to host. One host required for each BACnet or analog automation interface.
Communication cable For ease of installation, use factory-supplied Connect-Air part number W24182P-2306BL to provide communications and power in one cable. This wire has a twisted shielded pair 24 AWG low capacitance communications cable and an 18 AWG power cable in one wire.
Host automation interface Communication protocol BACnet MS/TP standard with two analog outputs per host. SA bus compliant.
Dimensions, H x W x D 6.5 in. x 5.75 in. x 4 in. (165 mm x 146 mm x 102 mm)
Enclosure NEMA 1 control enclosure
Display 16 x 2 character LCD display with airflow, temperature, configuration, and troubleshooting.
Sensor connectivity Plug and play connectivity to host or client
Analog outputs Airflow and temperature output 4 mA to 20 mA or 2 VDC to 10 VDC that uses supplied 500 ohm resistors
Short circuit protection A resettable solid state fuse protects analog outputs from short circuits
Operating range -20°F to 120°F (-29°C to 49°C)
Power requirement Power supplied by others, less than 15 VA at 24 VAC or DC
Compliance United States UL 60730-1 5th Edition, UL 60730-2-9 4th Edition, UL 60335-2-40, UL 60335-1, ISO 9001, BTL.

The performance specifications are nominal and conform to acceptable industry standard. For application at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls shall not be liable for damages resulting from misapplication or misuse of its products.