The BAPI BA/10K-2[XP]-I-18"-FEP2-NB-18" is an immersion temperature sensor with a 10K Type II NTC Thermistor (Extended-Precision Grade (+/-0.18 degF / +/-0.1 degC tolerance)) sensing element, potted in a 18 inch (457 mm) long, 0.25 inch OD 304 stainless steel probe with thermally-conductive compound. The probe threads into a thermowell via a 1/2 inch NPSM nylon fitting; on hand-tightening the probe slides up to 1.6 inch inside the enclosure body so the tip seats firmly against the thermowell bottom, giving solid thermal contact regardless of thermowell depth tolerance. This SKU is built with FEP2 insulated lead wire at 18" instead of the standard etched-Teflon plenum leadwire - FEP wire is preferred for direct-burial, oily, or high-flex service.
The sensor outputs resistance directly to the BAS analog input (no powered signal conditioning). The BAS converts resistance to temperature using a sensor-specific R/T table programmed in the controller. The unit is housed in the No Box (Lead Wire Direct) enclosure (No enclosure (probe-only), N/A (probe and lead wire only)) and wired for Flying Leads. Made in USA by BAPI of Gays Mills, Wisconsin.
Water-pipe, hydronic-loop, cooling-tower-sump, and tank temperature measurement on BAS systems that accept resistance-input directly (10K Type II NTC Thermistor (Extended-Precision Grade (+/-0.18 degF / +/-0.1 degC tolerance))). The 18 inch (457 mm) probe fits a matching BAPI thermowell of the same length; for a typical 8 inch insulated pipe, a 4 inch probe in a 4 inch thermowell reaches the centerline (best-case thermal contact with the flowing media).
Key Features
10K Type II NTC Thermistor (Extended-Precision Grade (+/-0.18 degF / +/-0.1 degC tolerance)) potted inside a 0.25 inch OD 304 stainless steel probe with thermally-conductive compound. Etched Teflon leadwire is plenum-rated. The double encapsulation keeps the sensor watertight under 100% RH non-condensing service.
Extended-precision thermistor at +/-0.18 degF (+/-0.1 degC) tolerance vs. the standard +/-0.36 degF. Long-term stability < 0.036 degF/year.
The plastic NPSM fitting allows the probe to slide up to 1.6 inch inside the enclosure as the unit is hand-threaded onto the thermowell - probe tip self-seats against the thermowell bottom on tightening. Hand-tight only; no thread sealant required on this side.
N/A (probe and lead wire only). No enclosure - probe with direct lead wire exit. Use when mounting inside a customer-supplied enclosure or junction box.
FEP-insulated lead wire is rated for higher temperatures, oils, and harsh chemical exposure than the standard etched-Teflon leadwire. Custom lead length is built to spec at the factory.
Designed and manufactured by Building Automation Products, Inc. at 750 North Royal Avenue, Gays Mills, Wisconsin. RoHS / CE compliant.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Building Automation Products, Inc. (BAPI) |
| Manufacturer Part Number | BA/10K-2[XP]-I-18"-FEP2-NB-18" |
| Series | BAPI Immersion w/ Nylon Fitting (B40/B41) |
| Sensor Type | Passive Resistance Sensor (unpowered) |
| Temperature Element | 10K Type II NTC Thermistor (Extended-Precision Grade (+/-0.18 degF / +/-0.1 degC tolerance)) |
| Nominal Resistance | 10 kOhm at 25 degC |
| Sensitivity | Non-linear (R/T table required) |
| Output Type | Resistance (to controller analog input, no polarity) |
| Probe Length | 18 inch (457 mm) |
| Probe Material | 304 Stainless Steel, 0.25 inch outer diameter |
| Probe Construction | Double-encapsulated sensing element with thermally-conductive potting |
| Process Fitting | 1/2 inch NPSM Plastic (Nylon) |
| Lead Wire | FEP-2 Insulated Lead Wire (extended, 2-conductor) (18") |
| Wiring Option | Flying Leads |
| Enclosure Model | No Box (Lead Wire Direct) |
| Enclosure Rating | No enclosure (probe-only) |
| Enclosure Material | N/A (probe and lead wire only) |
| Enclosure Dimensions (H x W x D) | Probe only - no enclosure |
| Enclosure Ambient Temperature | Per probe spec (-40 to 221 degF / -40 to 105 degC) |
| Ambient Humidity | 0 to 100% RH, non-condensing |
| Mounting Method | Thermowell insertion (1/2 inch NPSM Plastic (Nylon), hand-tightened) |
| Agency Compliance | RoHS, CE (where applicable) |
| Country of Origin | Made in USA (Gays Mills, WI) |
Documentation
Frequently Asked Questions
BAPI strongly recommends installing this sensor inside a matching thermowell rather than direct-immersion. A thermowell lets the sensor be removed and serviced without draining or depressurizing the pipe / tank, and protects the probe from corrosion or mechanical damage. Match the thermowell length to the probe length (18 inch (457 mm)).
This sensor is a passive 10K Type II NTC Thermistor (Extended-Precision Grade (+/-0.18 degF / +/-0.1 degC tolerance)). The BAS controller needs the matching R/T (resistance / temperature) curve programmed in its analog-input setup - typically selectable by manufacturer-specific table name. The full R/T table is at bapihvac.com under Resources -> Sensor Specs.
This SKU uses the No Box (Lead Wire Direct) (No enclosure (probe-only), N/A (probe and lead wire only)). No enclosure - probe with direct lead wire exit. Use when mounting inside a customer-supplied enclosure or junction box.
FEP (fluorinated ethylene propylene) insulation handles higher temperatures and broader chemical exposure than standard etched-Teflon plenum leadwire - common choice for direct-burial cable, oil-immersed sensors, or applications where the leadwire passes through flexible conduit with frequent motion.
Yes. BAPI Immersion sensors and transmitters are designed and manufactured by Building Automation Products, Inc. at 750 North Royal Avenue, Gays Mills, Wisconsin (USA).
- Brand:
- BAPI
- Series:
- Immersion Nylon Fitting Sensor
- Sensor Type:
- Passive Resistance Sensor
- Temperature Element:
- 10K Type II NTC Thermistor
- Output Signal:
- Resistance (to BAS analog input)
- Probe Length:
- 18 inch (457 mm)
- Probe Fitting:
- Nylon (1/2 inch NPSM Plastic)
- Calibrated Range:
- -40 to 221 degF (probe operating range, passive)
- Enclosure:
- No Box (Lead Wire Direct)
- Mount Position:
- N/A (Probe Only)
- Enclosure Rating:
- No enclosure (probe-only)
- Wiring Configuration:
- Flying Leads
- Country of Origin:
- Made in USA