The BAPI BA/20K-PP-5'-WP is a single-point remote sensor built around a heat conductive plastic cup 0.875 in long on a 0.175 in diameter shell and a passive 20K Thermistor. It ships with 5 ft (1.5 m) of plenum-rated cable, factory-terminated into a Weatherproof (WP) enclosure.
Remote sensors are built for tight spots — inside electronic circuit enclosures, retrofitted into existing pneumatic thermostats, or dropped into a junction box behind a wall plate. The element is passive and has no polarity, so both leads land directly on any controller analog input configured for the 20K Thermistor curve. The Weatherproof (WP) gives you a rated termination point right at the mounting surface instead of a splice above the ceiling.
Specifications
| Sensing Element | 20K Thermistor, NTC, 2-wire passive |
| Output | Resistance (non-linear) |
| Accuracy | ±0.36°F (±0.2°C) standard |
| Stability | < 0.036°F/year (< 0.02°C/year) |
| Heat Dissipation | 2.7 mW/°C |
| Temp. Drift | < 0.02°C per year |
| Probe Range | -40° to 221°F (-40° to 105°C) |
| Probe / Body | Heat conductive plastic cup, 0.875 in (22.2 mm) long, 0.175 in (4.45 mm) dia. |
| Lead Length | 5 ft (1.5 m) |
| Wire Insulation | Plenum-rated cable |
| Lead Wire | 22 AWG stranded |
| Enclosure | Weatherproof (WP) |
| Enclosure Rating | NEMA 3R, IP14 |
| Enclosure Material | Cast aluminum, UV rated |
| Enclosure Dimensions | 2.75 × 2.16 × 4.50 in (69.9 × 54.9 × 114.3 mm) |
| Conduit Entries | Two 1/2 in FNPT entries (bell box) |
| Wall Gasket | 0.25 in (6.35 mm) closed cell foam, mold impervious |
| Enclosure Ambient | -40° to 212°F (-40° to 100°C) |
| Operating Range | Units with plenum-rated wire: -4° to 167°F (-20° to 75°C), 0-100% RH non-condensing |
| Agency | RoHS, CE (passive thermistors 20KΩ and smaller), PT = DIN43760 | IEC Pub 751-1983 | JIS C1604-1989 |
Installation Notes
- Wire with twisted pair, 22 AWG minimum, using sealant-filled connectors. Heavier gauge may be needed on long runs.
- Do not share conduit with high or low voltage AC power wiring — BAPI testing shows signal error when AC runs alongside sensor leads.
- Two-wire passive element, no polarity. Land both leads on the controller analog input.
- Fits inside a standard junction box behind a wall plate cover, or retrofits into the body of an existing pneumatic thermostat.
- Mount the enclosure with #8 screws through at least two opposing tabs; a 1/8 in pilot hole makes this easier.
- Use caulk or Teflon tape on conduit entries, and bring conduit in from the bottom for outdoor or wet locations.
Documentation
Product Datasheet (PDF) · Installation & Operation (PDF) · Enclosure Dimensions (PDF)
ZOT Supply is an authorized distributor for Building Automation Products, Inc. (BAPI). This product carries the full BAPI factory warranty.
- Product Family:
- Remote Sensor
- Signal Type:
- Passive Resistive
- Sensing Element:
- 20K Thermistor
- Cable Type:
- Plenum-Rated
- Lead Length:
- 5 ft
- Enclosure:
- Weatherproof (WP)
- Enclosure Rating:
- NEMA 3R, IP14
- Probe Material:
- Heat Conductive Plastic
- Termination Option:
- Standard (Flying Leads)
- Mounting Style:
- Enclosure / Thermostat Retrofit
