The BAPI BA/T1K[32 TO 212F]-I-8"-BB2-M304-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 8 inch (203 mm) long, 0.25 inch OD 304 stainless steel assembly with a 1/2 inch NPSM nylon 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.
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.
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.
Premium 304 stainless steel construction throughout (vs. standard).
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-8"-BB2-M304-TS |
| Series | BAPI Immersion w/ Nylon Fitting (B40/B41) |
| 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 | 8 inch (203 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 | 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 NPSM Plastic (Nylon), hand-tightened) |
| Material Modifiers | 304 Stainless Steel Body |
| Agency Compliance | RoHS, CE (where applicable) |
| Country of Origin | Made in USA (Gays Mills, WI) |
Documentation
Mounting and probe-insertion instructions in 20907 apply to both passive and active variants since the probe / fitting / enclosure construction is identical. Active-transmitter wiring topology and output-mode jumper positions are shown on the wiring diagram inside the enclosure cover; the SS Double-Thread active install sheets (20919 / 37726) contain comparable transmitter-electronics detail.
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 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 Nylon Fitting Transmitter
- Sensor Type:
- Active Transmitter
- Temperature Element:
- 1K Platinum RTD (385 Curve, internal)
- Output Signal:
- 4-20 mA
- Probe Length:
- 8 inch (203 mm)
- Probe Fitting:
- Nylon (1/2 inch NPSM Plastic)
- 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