Name: BAPI BA/T1K[0 TO 100C]-H200-O-BB : Outside Air Humidity and Temperature Transmitter, ±2% RH, 0 to 5 VDC RH Output, 4 to 20 mA Temperature Output, 0 to 100°C Range, BAPI-Box IP66 / NEMA 4 Enclosure
Brand: BAPI
SKU: BA/T1K[0 TO 100C]-H200-O-BB
Price: 174 USD
Availability: InStock

Description
Warranty Information
Features

RH Accuracy±2% RH

RH Output0 to 5 VDC

Temperature4 to 20 mA, 0 to 100°C

PowerRH 10 to 35 VDC / 12 to 27 VAC; Temp 12 to 40 VDC

EnclosureBAPI-Box, IP66 / NEMA 4

BAPI BA/T1K[0 TO 100C]-H200-O-BB Overview

The BAPI BA/T1K[0 TO 100C]-H200-O-BB is an outside air humidity and temperature transmitter that combines a ±2% RH capacitive polymer humidity transmitter (0 to 5 VDC output) with a T1K 1K platinum RTD temperature transmitter (4 to 20 mA output scaled 0 to 100°C), housed in a BAPI-Box enclosure rated IP66 / NEMA 4.

BAPI calibrates its humidity transmitters at 10 points from 10 to 90% RH, eliminating field calibration. The humidity sensor sits in a 1 in. diameter probe below the enclosure, protected by a replaceable 80 micron sintered stainless steel filter.

The 0 to 5 VDC humidity output spans 0 to 100% RH, powered from 10 to 35 VDC or 12 to 27 VAC. The temperature transmitter runs on its own 12 to 40 VDC supply and sends a 4 to 20 mA signal scaled 0 to 100°C from a 1K platinum RTD (385 curve).

The BAPI-Box enclosure is UV-resistant polycarbonate rated IP66 and NEMA 4, and closed cell foam on the back seals it to the mounting surface.

Specifications verified against BAPI Outside Air Units datasheet Rev. 10/06/25, BAPI installation instructions 26415 rev. 10/12/26, enclosure dimension drawings Rev. 05/26/17 and BAPI enclosure styles application note Rev. 05/02/23. Last reviewed by ZOT Supply on November 3, 2026.

Best For

Controllers with 0 to 5 VDC analog inputs for outdoor humidity
Controllers that need outdoor air temperature as a 4 to 20 mA signal scaled 0 to 100°C
Panels with a DC supply for the temperature transmitter (12 to 40 VDC)
Exterior walls exposed to rain, sleet, snow, windblown dust and hose-directed water (NEMA 4)

Warranty

BAPI warrants its products to be free from defects in materials and workmanship for five years from the date of sale.

Key Features

10-Point Calibration

Calibrated at 10 points from 10 to 90% RH, eliminating field calibration.

0 to 5 VDC Humidity Output

0 to 5 VDC humidity output for 0 to 100% RH, powered from 10 to 35 VDC or 12 to 27 VAC.

1K RTD Temperature Transmitter

T1K transmitter with a 4 to 20 mA output scaled 0 to 100°C, ±0.065% of span system accuracy.

IP66 / NEMA 4 BAPI-Box

UV-resistant polycarbonate enclosure, UL 94 V-0, dust tight and protected against powerful water jets.

Replaceable Sintered Filter

80 micron sintered stainless steel filter unscrews for cleaning; replacement part BA/HDOFS3.

Reverse Polarity Protected

The humidity transmitter is polarity sensitive and reverse polarity protected.

Authorized Distributor

ZOT Supply is an authorized distributor of BAPI products.

Technical Specifications

Humidity
Sensor	Capacitive polymer
Accuracy	±2% RH (10 to 80% RH @ 25°C), ±3% RH (80 to 90% RH @ 25°C), non-condensing
Calibration	10 points from 10 to 90% RH
Drift	0.5% per year
Response Time	< 5 seconds in moving air
RH Linearity	Negligible, factory corrected linear from 10 to 80% RH
RH Hysteresis	Factory corrected to <1%
Output	0 to 5 VDC at 0 to 100% RH
Low RH Behavior	Output goes to its maximum value if humidity drops to 5% RH or below
Output Impedance	10 kΩ
Wiring	Red: power; White: humidity output to controller analog input; Black: common (ground for power and humidity output)
Power
Humidity Transmitter Supply	10 to 35 VDC, 22 mA max; 12 to 27 VAC, 0.53 VA max
Temperature Transmitter Supply	12 to 40 VDC
Temperature Transmitter
Transmitter	T1K
Output	4 to 20 mA
Range	0 to 100°C
Output Load	850 Ω @ 24 VDC
Wiring	Red: power (12 to 40 VDC); Black: 4 to 20 mA output to controller analog input
System Accuracy	±0.065% of span
Span and Zero Limits	Span 30 to 1000°F (17 to 555°C); zero -148 to 900°F (-100 to 482°C)
Sensor	1K platinum RTD, 385 curve, 2-wire
RTD Accuracy	±0.55°F (±0.3°C), standard accuracy
RTD Stability	±0.25°F (±0.14°C)
RTD Self Heating	0.4°C/mW @ 0°C
RTD Probe Range	-40 to 221°F (-40 to 105°C)
Physical
Probe	2.4 in. below enclosure, 1 in. diameter
Filter	80 micron sintered stainless steel, replaceable (BA/HDOFS3)
Enclosure	BAPI-Box (BB)
Enclosure Material	UV-resistant polycarbonate, UL 94 V-0
Enclosure Rating	IP66, NEMA 4
Enclosure Dimensions	4.15 x 5 x 2.5 in. (105.4 x 127 x 63.5 mm), W x H x D
Ports	1/2 in. NPSM ports and a 1/2 in. drillable port
Mounting Seal	Closed cell foam
Termination	Open wire; 18 to 26 AWG with sealant filled crimp connector (BA/SFC1000-x00) or 26 to 16 AWG with sealant filled wire nut (BA/SFC2000-x00)
Wiring Practice	Twisted pair, 22 AWG minimum; do not run in the same conduit as AC power wiring; keep at least 5 ft from radio-emitting devices
Environment and Compliance
Operating Range (Humidity Transmitter)	-40 to 158°F (-40 to 70°C), 0 to 100% RH
Temperature Transmitter Ambient	-4 to 158°F (-20 to 70°C), 0 to 95% RH, non-condensing
Compensation	Fully temperature compensated
Agency	CE EN 61326-1:2013 EMC, RoHS
Warranty	5 years from date of sale

Documentation

BAPI Outside Air Units Datasheet

BAPI Duct and Outside Air Humidity with Temperature Transmitter Installation and Operating Instructions

BAPI Outside Air Units Enclosure Dimension Drawings (BB2 and BB)

BAPI Non-Room Enclosure Styles Application Note

BAPI CE Declaration of Conformity, Humidity Transmitters in BB/BB2 Enclosures

Frequently Asked Questions

What is the BAPI BA/T1K[0 TO 100C]-H200-O-BB?

What power supply does the BAPI BA/T1K[0 TO 100C]-H200-O-BB need?

The humidity transmitter runs on 10 to 35 VDC (22 mA max) or 12 to 27 VAC (0.53 VA max). Power requirements depend on the humidity output type. The temperature transmitter needs 12 to 40 VDC.

How accurate is the BAPI BA/T1K[0 TO 100C]-H200-O-BB?

Humidity accuracy is ±2% RH (10 to 80% RH @ 25°C), ±3% RH (80 to 90% RH @ 25°C), non-condensing. The temperature transmitter is accurate to ±0.065% of span, and its 1K platinum RTD to ±0.55°F (±0.3°C).

How do I convert the 0 to 5 VDC output to percent RH?

Use %RH = V / 0.05. The output spans 0 to 100% RH.

How do I convert the 4 to 20 mA temperature output to temperature?

Use T = Tlow + ((mA - 4) x Tspan) / 16, where Tspan = Thigh - Tlow. For this unit, Tlow and Thigh are the ends of the 0 to 100°C range.

Can the BAPI-Box enclosure take hose-directed water?

Yes. The BAPI-Box is rated IP66 (dust tight and protected against powerful water jets from any direction) and NEMA 4 (protected against rain, sleet, snow, windblown dust, splashing water and hose-directed water, and undamaged by external ice formation).

Does an outdoor sensor need a weather shade?

Radiant heat from building surfaces and parking lots affects outdoor temperature and humidity sensors. The BAPI Weather Shade blocks that radiant heat, improving sensor accuracy.

Where should an outside air humidity sensor be mounted?

Mount it in a permanently shaded area away from windows and doors, out of direct sunlight, with the sensor probe pointed down. Seal the wiring hole with caulk after wiring, and terminate with sealant filled connectors.

5-year BAPI warranty from date of sale

Sensor Type:: Outside Air
Humidity Element:: 2%
Output Signal:: 0-5 VDC
Temperature Element:: Transmitter
CO2 Element:: None
Display:: No Display
VOC Element:: None
Probe Length:: 2.4
Enclosure:: NEMA 4 Enclosure
Supported Protocols:: None

BAPI BA/T1K[0 TO 100C]-H200-O-BB : Outside Air Humidity and Temperature Transmitter, ±2% RH, 0 to 5 VDC RH Output, 4 to 20 mA Temperature Output, 0 to 100°C Range, BAPI-Box IP66 / NEMA 4 Enclosure

BAPI

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