The BAPI BA/T1K[32 TO 212F]-I-4"-SS-BB2-TS 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 32 TO 212F. 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 BAPI-Box 2 enclosure (NEMA 4 / IP66, UV-Resistant Polycarbonate, UL94 V-0) and wired for Terminal Strip (-TS). 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 32 TO 212F 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.
UV-Resistant Polycarbonate, UL94 V-0. Compact NEMA 4 polycarbonate enclosure with smaller footprint than BB.
Plug-in terminal strip allows the sensor head to be removed and replaced without re-stripping or re-terminating the BAS-side wiring. Major time-saver on rooftop or remote 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[32 TO 212F]-I-4"-SS-BB2-TS |
| 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 | 32 TO 212F |
| 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 | Terminal Strip (-TS) |
| Enclosure Model | BAPI-Box 2 |
| Enclosure Rating | NEMA 4 / IP66 |
| Enclosure Material | UV-Resistant Polycarbonate, UL94 V-0 |
| Enclosure Dimensions (H x W x D) | 4.9 x 2.8 x 2.35 inch (125 x 71.6 x 60 mm) |
| Enclosure Ambient Temperature | -40 to 185 degF (-40 to 85 degC) |
| Ambient Humidity | 0 to 100% RH, non-condensing |
| Mounting Method | Thermowell insertion (1/2 inch NPT Stainless Steel, hand-tightened) |
| 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 32 TO 212F. 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 BAPI-Box 2 (NEMA 4 / IP66, UV-Resistant Polycarbonate, UL94 V-0). Compact NEMA 4 polycarbonate enclosure with smaller footprint than BB.
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 plug-in terminal strip lets a technician disconnect the entire sensor head (without re-stripping or re-terminating any BAS-side wiring) and swap in a replacement. The BAS-side wiring stays terminated at the terminal strip; only the factory-wired side of the strip changes.
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:
- 32 TO 212F
- Enclosure:
- BAPI-Box 2
- Enclosure Rating:
- NEMA 4 / IP66
- Wiring Configuration:
- Terminal Strip (-TS)
- Country of Origin:
- Made in USA