20909_ins_OSA_Passive Installation & Operations Outside Air Temperature Sensors BA/#-O Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. rev. 02/10/21 1 of 4 Overview and Identification BAPI’s Outside Air temperature Sensor is available with multiple thermistors or RTDs as shown in the specifications section. The probe is made to protect the sensor from rain, sleet, snow or bird droppings. Enclosuress come in plastic or metal for both NEMA 3R and NEMA 4 applications and are all UV rated. Fig. 1: Outside Air Sensor in a BAPI-Box (-BB) Enclosure Fig. 2: Outside Air Sensor in a BAPI-Box 2 (-BB2) Enclosure Fig. 3: Outside Air Sensor in a Weatherproof (-WP) Enclosure20909_ins_OSA_Passive Installation & Operations Outside Air Temperature Sensors BA/#-O Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. rev. 02/10/21 2 of 4 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 figs 4-6. 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 filled 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 enclosures and secure with provided cover security screws. Mounting Fig. 6: Weatherproof (-WP) Enclosure Installation Fig. 4: BAPI-Box (-BB) Enclosure Installation Fig. 5: BAPI-Box 2 (-BB2) Enclosure Installation20909_ins_OSA_Passive Installation & Operations Outside Air Temperature Sensors BA/#-O Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. rev. 02/10/21 3 of 4 Wiring & Termination BAPI recommends using twisted pair of at least 22AWG and sealant filled 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. Fig. 7: 2 Wire Termination for Thermistor or RTD Fig. 8: 3 Wire Termination for RTD Thermistor or RTD Sensor To Controller Analog Input (AI) (No Polarity) To Controller Analog Input (AI) (No Polarity) Fig. 9: Terminal Strip (-TS) Option for 2 Wire Sensors Termination Fig. 10: Terminal Strip (-TS) Option for 3 Wire Sensors Termination Fig. 11: Test & Balance (-TB) Option for 2 Wire Sensors Termination Fig. 12: Test & Balance (-TB) Option for 3 Wire Sensors Termination20909_ins_OSA_Passive Installation & Operations Outside Air Temperature Sensors BA/#-O Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com Specifications subject to change without notice. rev. 02/10/21 4 of 4 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 ..........-40 to 221ºF (-40 to 105ºC) RTD: Resistance Temperature Device Platinum (Pt) .........100Ωor 1KΩ @0ºC, 385 curve, Platinum (Pt) .........1KΩ @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 ......0.4ºC/mW @0ºC Pt Probe range ......-40 to 221ºF, (-40 to 105ºC) Nickel (Ni) ..............1KΩ @70ºF, JCI curve Ni Probe range ......-40 to 221ºF (-40 to 105ºC) Sensitivity: Approximate @ 32ºF (0ºC) Thermistor .........Non-linier – Go to bapihvac.com click “Resources” and “BAPI Sensors Overview” 1K Ω RTD (Pt) ........3.85Ω/ºC 100 Ω RTD (Pt).......0.385Ω/ºC Nickel (Ni) .............2.95Ω/ºF for the JCI RTD Specifications Lead Wire: 22awg stranded Wire Insulation: Etched Teflon, Plenum rated Probe: Vented polycarbonate shield, ½” OD Probe Length: 1.2” w/ ½” NPT threads Wall Gasket: Closed cell foam (impervious to mold) Enclosure Types Weatherproof ..-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 Enclosure Ratings Weatherproof ..-WP, NEMA 3R, IP14 BAPI-Box .........-BB, NEMA 4, IP66 BAPI-Box 2 ......-BB2, NEMA 4, IP66 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 Ambient (Enclosure) Weatherproof.........-WP, -40ºF to 212ºF, (-40º to 100ºC) BAPI-Boxes............-BB, -BB2, -40ºF to 185ºF, (-40º to 85ºC) Humidity.................0 to 100% RH, Non-condensing Agency RoHS, CE (CE for all sensors below 10KΩ) PT = DIN43760, IEC Pub 751-1983, JIS C1604-1989 *Passive Thermistors 20KΩ and smaller are CE Compliant Diagnostics Possible Solutions: -Confirm 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. Possible Problem: Controller reports higher or lower than actual temperatureNext >