The BAPI BA/T1K[0 TO 100F]-I-4"-SS-WPO is an immersion temperature transmitter pairing a 1000 Ohm Platinum RTD (385 curve) sensing element with an on-board signal-conditioning circuit, delivering a 4-20 mA output (2-wire loop-powered) calibrated for 0 TO 100F. The transmitter scales the temperature span to the full output swing - the low end of the range corresponds to output low (0V / 1V / 2V / 4 mA depending on output mode), the high end to output high. 2-wire loop-powered - 12-30 VDC from the controller drives the transmitter; no separate supply at the sensor.
The probe is a 4 inch (102 mm) long, 0.25 inch OD 304 stainless steel assembly with a Stainless Steel double-threaded fitting for thermowell mounting; on hand-tightening the probe self-seats against the thermowell bottom. The transmitter is housed in the Weatherproof Cast Aluminum (Outside Mount) enclosure (NEMA 3R / IP14, Die-Cast Aluminum, BAPI-Bell with hinged cover) 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 controllers that need a 4-20 mA analog signal rather than a raw RTD resistance. Calibrated 0 TO 100F span suits applications where the working range falls within those endpoints (narrower ranges deliver higher resolution per degree). The probe fits a matching BAPI thermowell of the same length.
Key Features
Combines a Platinum 1000 Ohm RTD (385 curve, DIN43760) sensing element with a factory-calibrated transmitter on the same board. Eliminates the BAS R/T table lookup and external signal conditioner.
2-wire 4 to 20 mA loop-powered output. No 24 VAC/VDC supply needed at the sensor - the controller's loop power drives the transmitter. Ideal for long cable runs.
Transmitter span is set at the factory to the indicated range. Lower end of temperature span = output low (0V / 1V / 2V / 4 mA); higher end = output high.
1/2 inch NPT stainless steel threads provide a metal-to-metal seal and resist corrosion in process fluids. Use thread sealant per the application.
Die-Cast Aluminum, BAPI-Bell with hinged cover. Heavy-duty cast aluminum weatherproof bell enclosure for outdoor and harsh environments.
Mounting flange located on the OUTSIDE of the enclosure body - the probe exits from the rear and the enclosure mounts flush to a panel or wall. Useful in tight wiring closets and slim-profile installations.
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/T1K[0 TO 100F]-I-4"-SS-WPO |
| Series | BAPI Immersion w/ Stainless Steel Fitting |
| Sensor Type | Active Transmitter (powered) |
| Sensing Element | 1000 Ohm Platinum RTD, 385 Curve (DIN43760) |
| Output Signal (Factory Set) | 4-20 mA |
| Output Topology | 2-wire loop-powered |
| Output Selectability | Fixed 4-20 mA loop-powered |
| Calibrated Temperature Range | 0 TO 100F |
| Power Supply | 12-30 VDC loop-powered |
| Probe Length | 4 inch (102 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 NPT Stainless Steel |
| Lead Wire | 22 AWG Stranded, Etched Teflon, Plenum Rated |
| Wiring Option | Flying Leads |
| Enclosure Model | Weatherproof Cast Aluminum (Outside Mount) |
| Enclosure Rating | NEMA 3R / IP14 |
| Enclosure Material | Die-Cast Aluminum, BAPI-Bell with hinged cover |
| Enclosure Dimensions (H x W x D) | See BAPI enclosure dimension drawings (B69) |
| Enclosure Ambient Temperature | -40 to 212 degF (-40 to 100 degC) |
| Ambient Humidity | 0 to 100% RH, non-condensing |
| Mounting Method | Thermowell insertion (1/2 inch NPT Stainless Steel, hand-tightened) |
| Mount Configuration | Outside-Mount (mounting flange on exterior of enclosure) |
| Agency Compliance | RoHS, CE (where applicable) |
| Country of Origin | Made in USA (Gays Mills, WI) |
Documentation
Frequently Asked Questions
The active transmitter outputs a calibrated 4-20 mA analog signal directly proportional to temperature - the BAS reads the analog value and interprets it linearly across the calibrated span. A passive sensor outputs raw resistance which the BAS must convert using a sensor-specific R/T curve. Use the transmitter when (1) your controller doesn't have a built-in R/T table, (2) you want a longer cable run without lead-resistance error, or (3) the integrator wants to standardize on 4-20 mA / 0-10V analog signals.
This SKU is factory-calibrated for 0 TO 100F. The low end of that range corresponds to the output's low value (4 mA / 0V / 1V / 2V depending on output type); the high end corresponds to the output's high value (20 mA / 5V / 10V). Pick the narrowest span that comfortably brackets your expected working range - narrower spans give higher resolution per degree on the controller input.
2-wire loop-powered: 12-30 VDC supply, two wires carry both power and the current-modulated signal. Wire 24 VDC+ from the controller / loop power supply to the transmitter's + terminal; transmitter's - terminal returns to the controller's 4-20 mA AI. Recommended cable: 22 AWG twisted shielded pair. Ground the shield at the BAS end only.
This SKU uses the Weatherproof Cast Aluminum (Outside Mount) (NEMA 3R / IP14, Die-Cast Aluminum, BAPI-Bell with hinged cover). Heavy-duty cast aluminum weatherproof bell enclosure for outdoor and harsh environments.
The SS fitting is double-threaded and seals metal-to-metal with the thermowell - more robust than the nylon NPSM fitting for high-pressure water service or applications where chemical compatibility, vibration, or mechanical abuse could fatigue a plastic fitting. The SS variant uses 1/2 inch NPT threads (standard tapered) which seat with thread sealant; the nylon variant uses 1/2 inch NPSM (straight) threads and is hand-tight only with no sealant.
The mounting flange is relocated to the OUTSIDE of the enclosure body (instead of the standard inside-mount configuration). The probe exits from the rear of the enclosure and the enclosure mounts flush against a panel or wall. Useful in tight wiring closets, slim panel installations, or applications where the enclosure must be flush with the mounting surface.
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 SS Double-Threaded Transmitter
- Sensor Type:
- Active Transmitter
- Temperature Element:
- 1K Platinum RTD (385 Curve, internal)
- Output Signal:
- 4-20 mA
- Probe Length:
- 4 inch (102 mm)
- Probe Fitting:
- Stainless Steel (1/2 inch NPT, Double-Threaded)
- Calibrated Range:
- 0 TO 100F
- Enclosure:
- Weatherproof Cast Aluminum
- Mount Position:
- Outside Mount
- Enclosure Rating:
- NEMA 3R / IP14
- Wiring Configuration:
- Flying Leads
- Country of Origin:
- Made in USA