BAPI Outside Air (OSA) Temperature Transmitters Catalog Page
Outside Air (OSA) Temperature Transmitters
BA/T1# -O Temperature Sensor
Installation & Operations
20920_ins_OSA_Active
Overview
The BA/T1xx-O is for Outside Air mounting and temperature measurement. The probe is made to protect the sensor from
impediments such as, rain, sleet, snow or bird droppings. The 4 to 20mA transmitter can be ordered with 100Ω (385),
1KΩ (385) RTDs or 10KΩ type 2 thermistor sensors. A 0 to 5VDC or 0 to 10VDC transmitter is also available with a 10KΩ
type 2 thermistor sensor. Special high accuracy RTD matched transmitters (M) are available which use class A RTD’s and
match the sensor to the transmitter for improved accuracy. Enclosure mounting styles come in plastic or metal for both
NEMA 3R and NEMA 4 applications and are all UV rated.
Identication
rev. 06/30/15
Fig 1: Outside Air Sensor in a BAPI-Box (BB) Enclosure
Fig 3: Outside Air Sensor in a Weatherproof (WP) Enclosure
Fig 2: Outside Air Sensor in a BAPI-Box 2 (BB2) Enclosure
Fig 4: Outside Air Sensor in a Weather Tight (EU) Enclosure
Specications subject to change without notice.
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20920_ins_OSA_Active
Mounting
Outside Air (OSA) Temperature Transmitters
BA/T1# -O Temperature Sensor
Installation & Operations
rev. 06/30/15
Fig 5: BAPI-Box (BB) Enclosure Installation
Fig 6: BAPI-Box 2
Fig 8: Weather Tight (EU) Enclosure InstallationFig 7: Weatherproof (WP) Enclosure Installation
(BB2) Enclosure Installation
Outside Air (OSA) sensor placement is critical to good performance. The OSA sensor must be mounted in the shade
away from building windows, doors or vents. They should never be in direct sunlight or you will have higher than expected temperature readings by as much as +30%. The ideal shaded location in the Northern hemisphere is on the North side
of the building. In the Southern hemisphere the South side of the building is ideal.
The sensor shield and probe should always point down and mounted between four feet above the ground/roof and one
foot minimum below the eave. (Note: Four feet keeps the sensor above the ground or roof top radiation and one foot under the eave prevents measurement of trapped heat from under the eave.)
Drill the mounting holes and mount as shown in the gures 5-8. Snug up the mounting screws to ensure that the foam
backing compresses to about 50% of its thickness to make a gasket type seal against the wall surface.
Route the wires into the box and terminate with sealant lled connectors to prevent water from attacking the connection,
thereby preventing costly callbacks. Best practice is to caulk the wiring hole after the wiring is installed. Close the cover of
the BB, BB2 or WP boxes and secure with provided cover screws or twist on the cover of the EU box to the second click.
Specications subject to change without notice.
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