BAPI Outside Air Temperature Sensors Catalog Page

Outside Air Temperature Sensors BA/#-O
Installation & Operations
20909_ins_OSA_Passive
Overview
Identication
rev. 06/29/15
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
Specications subject to change without notice.
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Outside Air Temperature Sensors BA/#-O
Installation & Operations
20909_ins_OSA_Passive
Mounting
Fig 5: BAPI-Box (-BB) Enclosure Installation Fig 6: BAPI-Box 2 (-BB2) Enclosure Installation
rev. 06/29/15
Fig 8: Weather Tight (-EU) Enclosure InstallationFig 7: Weatherproof (-WP) 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.
Specications subject to change without notice.
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Outside Air Temperature Sensors BA/#-O
Installation & Operations
20909_ins_OSA_Passive
Wiring & Termination
BAPI recommends using twisted pair of at least 22AWG and sealant lled connectors for all wire connections. Larger gauge wire may be required for long runs. All wiring must comply with the National Electric Code (NEC) and local codes. Do NOT run this device’s wir­ing in the same conduit as high or low voltage AC power wiring.
BAPI’s tests show that inaccurate signal levels are possible when AC power wiring is present in the same conduit as the sensor wires.
rev. 06/29/15
To Controller Analog Input (AI) (No Polarity)
Sensor
To Controller Analog Input (AI) (No Polarity)
Fig. 9: 2 Wire Lead Wire Termination for Thermistor or RTD
To 3 Wire Transmitter
Sensor
To 3 Wire Transmitter
Fig. 10: 3 Wire Lead Wire Termination for RTD
Fig. 11: Terminal Strip (-TS) Option for 2 Wire Sensors
Termination
Fig. 13: Test & Balance (-TB) Option for 2 Wire Sensors
Termination
Specications subject to change without notice.
Fig. 12: Terminal Strip (-TS) Option for 3 Wire
Sensors Termination
Fig. 14: Test & Balance (-TB) Option for 3 Wire
Sensors Termination
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20909_ins_OSA_Passive
Diagnostics
Possible Problem:
Controller reports higher or lower than actual temperature
Possible Solutions:
- Conrm the input is set up correctly in the front end software
- Check wiring for proper termination & continuity. (shorted or open)
- Disconnect wires and measure sensor resistance and verify the “Sensor” output is correct.
Specications
Sensor Passive Thermistor NTC, 2 wire RTD PTC, 2 or 3 wire
Thermistor Thermal resistor Temp. Output Resistance Accuracy (Std) ±0.36ºF, (±0.2ºC) Accuracy (High) ±0.18ºF, (±0.1ºC), [XP] option Stability < 0.036ºF/Year, (<0.02ºC/Year) Heat dissipation 2.7 mW/ºC Temp. Drift <0.02ºC per year Probe range -40º to 221ºF (-40º to 105ºC)
RTD Resistance Temperature Device Platinum (Pt) 100or 1K @0ºC, 385 curve, Platinum (Pt) 1K @0ºC, 375 curve Pt Accuracy (Std) 0.12% @Ref, or ±0.55ºF, (±0.3ºC) Pt Accuracy (High) 0.06% @Ref, or ±0.277ºF, (±0.15ºC), [A]option
Pt Stability ±0.25ºF, (±0.14ºC) Pt Self Heating 0.4 ºC/mW @0ºC Pt Probe range -40º to 221ºF, (-40 to 105ºC) Nickel (Ni) 1000 @70ºF, JCI curve Ni Probe range -40º to 221ºF (-40 to 105ºC)
Sensitivity Approximate @ 32ºF (0ºC) Thermistor Non-linier Go to bapihvac.com “Sensor Specs”
1K RTD (Pt) 3.85/ºC 100 RTD (Pt) 0.385/ºC Nickel (Ni) 2.95/ºF for the JCI RTD
Outside Air Temperature Sensors BA/#-O
Installation & Operations
rev. 06/29/15
Lead wire 22awg stranded Wire Insulation Etched Teon, Plenum rated Probe Vented polycarbonate shield, ½” OD Probe Length Mounting Extension tabs (ears), 3/16” holes
Wall Gasket Closed cell foam (impervious to mold)
Enclosure Types
Weather Proof -WP, w/ two ½” FNPT entries, (Bell box) BAPI-Box -BB, w/ four ½” NPSM & one ½” drill-outs BAPI-Box 2 -BB2, w/ three ½” NPSM & three ½” drill-outs Weather Tight -EU, w/ two ½” drill-outs
Enclosure ratings
Weatherproof -WP, NEMA 3R, IP14 BAPI-Box -BB, NEMA 4, IP66 BAPI-Box 2 -BB2, NEMA 4, IP66 Weather Tight -EU, NEMA 4, IP66, UV rated
Enclosure materials
Weatherproof -WP, Cast Aluminum, UV rated BAPI-Box -BB, Polycarbonate, UL94V-0, UV rated BAPI-Box 2 -BB2, Polycarbonate, UL94V-0, UV rated Weather Tight -EU,
Ambient (Enclosure) 0 to 100% RH, Non-condensing Weatherproof -WP, -40ºF to 212ºF, (-40º to 100ºC) BAPI-Boxes -BB, -BB2, -40ºF to 185ºF, (-40º to 85ºC) Weather Tight -EU, -40ºF to 185ºF, (-40º to 85ºC)
Agency RoHS, CE (CE for all sensors below 10KΩ) PT = DIN43760, IEC Pub 751-1983, JIS C1604-1989
1.2” w/ ½” NPT threads
Plastic,
UL94V-0, UV rated
*Passive Thermistors 20KΩ and smaller are
CE Compliant
Related Products
BA/SFC1000-100 Sealant lled crimp connectors (100 connectors) BA/SFC2000-100 Sealant lled crimp twist on wire nuts (100 nuts)
Specications subject to change without notice.
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