Duct Mounted Thermistor and RTD Temperature Probe (BA/#-D)
20787_INS_Duct_Passive_RTD_Therm
Overview and Identication
The BA/#-D is a duct mounted passive resistive sensor.
It comes in a variety of probe lengths and optional
mounting enclosures shown below.
The BA/#-D can be ordered with all the most common
Thermistor’s or RTD’s used with virtually any BAS
system. All thermistor and (385) RTD sensors come
with standard accuracy as well as high accuracy
models [XP] and [A] options respectively.
Installation & Operations
rev. 09/26/17
Fig 1: Duct Unit with No Box (NB)
Fig 2: Duct Unit with J-Box (Standard)
Fig 4: Duct Unit with BAPI-Box (BB) Enclosure
Fig 3: Duct Unit with Weatherproof (WP) Enclosure
Fig 5: Duct Unit with BAPI-Box 2 (BB2) Enclosure
Fig 6: Duct Unit with Weather Tight (EU) Enclosure
Specications subject to change without notice.
Fig 7: Duct Unit with BAPI-Box 4 (BB4) Enclosure
(A Pierceable Knockout Plug is available from BAPI
for the open port in the BB4. Part #BA/PKP-100)
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Duct Mounted Thermistor and RTD Temperature Probe (BA/#-D)
Installation & Operations
20787_INS_Duct_Passive_RTD_Therm
Mounting
1. Place the sensor in the middle of the duct away from temperature stratied air, coils or humidiers to achieve the best
temperature reading.
2. Drill the probe hole as depicted on this page for the enclosure being used. Insert the probe into the duct.
3. Mount the enclosure to the duct using BAPI recommended #8 screws through a minimum of two opposing mounting tabs.
Weatherproof (WP) enclosures require assembly of the mounting tabs on opposite corners. A
1/8 inch pilot screw hole in
the duct makes mounting easier through the mounting tabs. Use the enclosure tabs to mark the pilot hole locations.
4. Snug up the sensors so that the foam backing is depressed to prevent air leakage but do not over-tighten or strip the
screw threads.
Note 1: Do not drill into the water tight enclosures (BB, BB2, WP, EU, EUO) which will violate the NEMA and/or IP rating.
Note 2: Use caulk or Teon tape for your conduit entries to maintain the appropriate NEMA or IP rating for your application.
Note 3: Conduit entry for outdoor or wet applications should be from the bottom of the enclosure.
rev. 09/26/17
Fig 8: Junction Box or No Box
(NB) Mounting Holes
Fig 11: Weather Tight (EU or
EUO) Enclosure Mounting Holes
Fig 9: BAPI-Box 2 (BB2)
Enclosure Mounting Holes
Fig 12: Weatherproof (WP)
Enclosure Mounting Holes
Fig 10: BAPI-Box (BB) Enclosure Mounting
Holes, Rotate 90° for Horizontal Mounting
Fig 13: BAPI-Box 4 (BB4) Enclosure
Mounting Holes
Specications subject to change without notice.
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Duct Mounted Thermistor and RTD Temperature Probe (BA/#-D)
Installation & Operations
20787_INS_Duct_Passive_RTD_Therm
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.
To Controller
Analog Input (AI)
(No Polarity)
Thermistor
or RTD
Sensor
To Controller
Analog Input (AI)
(No Polarity)
rev. 09/26/17
Fig. 14: 2 Wire Lead Wire Termination for Thermistor or RTD
Fig. 16: Terminal Strip (-TS) Option for 2 Wire Sensors
Termination
Fig. 15: 3 Wire Lead Wire Termination for RTD
Fig. 17: Terminal Strip (-TS) Option for 3 Wire
Sensors Termination
Fig. 18: Test & Balance (-TB) Option for 2 Wire Sensors
Termination
Specications subject to change without notice.
Fig. 19: Test & Balance (-TB) Option for 3 Wire
Sensors Termination
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Duct Mounted Thermistor and RTD Temperature Probe (BA/#-D)
20787_INS_Duct_Passive_RTD_Therm
Diagnostics
Problems:
Controller reports higher or lower
than actual temperature
Specications
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) 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 0.4 ºC/mW @0ºC
Pt Probe range -40º to 221ºF, (-40 to 105ºC)
Nickel (Ni) 1000Ω @70ºF, JCI curve
Ni Probe range -40º to 221ºF (-40 to 105ºC)
Sensitivity Approximate @ 32ºF (0ºC)
Thermistor Non-linier
See bapihvac.com “Sensor Specs”
1KΩ RTD (Pt) 3.85Ω/ºC
100Ω RTD 0.385Ω/ºC
Nickel (Ni) 2.95Ω/ºF for the JCI RTD
Lead wire 22awg stranded
Wire Insulation Etched Teon, Plenum rated
Probe 304 Stainless steel, 0.25” OD
Probe Length: 2’, 4’, 8’ or per order
Mounting Extension tabs (ears), 3/16” holes
Duct Gasket: 1/4” Closed cell foam
(impervious to mold)
Possible Solutions:
- Conrm 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.
Installation & Operations
rev. 09/26/17
Enclosure Types: (Part number designator in bold)
No Box: -NB, intended for open wiring
J-Box: -JB, w/ eight ½” knock-outs
Weatherproof: -WP, w/ two ½” FNPT entries, (Bell box)
BAPI-Box: -BB, w/ four ½” NPSM & one ½” drill-out
BAPI-Box 2: -BB2, w/ three ½” NPSM & three ½” drill-outs
BAPI-Box 4:
Weather Tight: -EU, EUO, w/ two ½” knock-outs
Enclosure Ratings: (Part number designator in bold)
No Box: -NB, No rating
J-Box: -JB, NEMA 1
Weatherproof: -WP, NEMA 3R, IP14
BAPI-Box: -BB, NEMA 4, IP66, UV Rated
BAPI-Box 2: -BB2, NEMA 4, IP66, UV Rated
BAPI-Box 4: -BB4, IP10
(IP44 with Knockout Plug in open port)
Weather Tight: -EU, NEMA 4, IP66
Weather Tight: -EUO, NEMA 4, IP66, UV rated
Enclosure Material: (Part number designator in bold)
No Box: -NB, Nylon 66, UL94H-B
J-Box: -JB, Galvanized steel, UL94H-B
Weatherproof: -WP, Cast Aluminum, UV rated
BAPI-Box: -BB, Polycarbonate, UL94V-0, UV rated
BAPI-Box 2: -BB2, Polycarbonate, UL94V-0, UV rated
BAPI-Box 4: -BB4, Polycarbonate & Nylon, UL94V-0
Weather Tight: -EU, ABS Plastic, UL94V-0
Weather Tight:
Ambient (Enclosure): 0 to 100% RH, Non-condensing
All BAPI-Boxes:
Weather Tight: -EU, -40 to 185ºF (-40 to 85ºC)
Junction Box: -JB, -40 to 212ºF (-40 to 100ºC)
No Box -NB, -40 to 212ºF (-40 to 100ºC)
Weatherproof: -WP, -40ºF to 212ºF (-40º to 100ºC)
Agency: RoHS
PT= DIN43760, IEC Pub 751-1983,
JIS C1604-1989
-BB4, with three ½” drill-outs, one ½” open port
-EUO, ASA (Geloy) Plastic, UL94V-0, UV rated
-BB, BB2 & BB4, -40 to 185ºF (-40 to 85ºC)
Specications subject to change without notice.
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