Trane 4190-7020 / BAYSENS037A X13790445010 SEN01178 Duct Mount Humidity & Temperature Zone Sensor – 4–20mA, 3% RH Accuracy, Polymer Capacitive Element

Trane 4190-7020 / BAYSENS037A X13790445010 SEN01178 Duct Mount Humidity & Temperature Zone Sensor – 4–20mA, 3% RH Accuracy, Polymer Capacitive Element

Condition: Used. Good used condition.

This Trane 4190-7020 duct-mounted humidity and temperature sensor is a high-precision zone accessory used in advanced HVAC control systems. Designed for direct duct installation, it accurately monitors relative humidity (±3%) and temperature, providing a 4–20mA analog output for integration into Trane rooftop units (RTUs), air handlers, or building automation systems. The polymer capacitive sensing element ensures reliable, long-term operation with minimal drift. This unit is compatible with numerous Trane cooling and gas/electric systems, including the THC, YHC, YC, and YHD series.

Features
Humidity Accuracy: ±3% RH (0 to 95% non-condensing)
Output Signal: 4 to 20 mA (humidity and temperature)
Sensor Type: Polymer capacitive humidity with integrated temperature thermistor
Thermistor Resistance: 10 kΩ (standard Trane-compatible thermistor)
Mounting Type: Duct mount with two-position terminal block
Drift Rate: <1% RH/year
Design Change Revision: “A” – minor internal revision
Voltage Requirement: 24V DC nominal
Temperature Operating Range: -20°F to 140°F (-28.8°C to 60°C)
Weight: 1.0 lb (shipping weight)
Trane Series: BAY
Sensing Application: Zone-level humidity & temperature monitoring

Applications and Compatible Trane Systems
This sensor is specified for the following Trane systems:
THC036-120A_R (Cooling)
THC033-063A_R (Cooling)
YHC036-120A_R (Gas/Electric)
YHC033-063A_R (Gas/Electric)
THD150-240 (with Reheat)
YHC037-067 (Gas/Electric)
YC036-120 (Cooling)
YHD150, YHD180, YHD240F (with Reheat)
These rooftop and packaged units utilize this sensor for enhanced humidity control and temperature modulation, especially in environments requiring humidity-sensitive processes or occupant comfort optimization.

Cross-Referenced Part Numbers
The following are equivalent Trane OEM part numbers:
4190-7020
BAYSENS037A
SEN01178
X13790445010

Comparable Products
Functionally similar sensors from other manufacturers include:
Honeywell H7625A2006 (Duct Mount, 3% RH, 4–20mA Output)
Veris HX03D3A (4–20mA, Duct Mount, 3% RH)
Johnson Controls HE-67xx Series (Humidity/Temp Duct Sensor)
Siemens QFA3171 (Duct mount humidity/temp, 4–20mA)

Possible Larger Systems and Assemblies
This sensor integrates directly into Trane’s Zone Sensing and Building Automation Architecture such as:
Tracer SC+ and Tracer Summit BAS systems
Voyager™, Precedent™, IntelliPak™, and Y-Series RTUs
Custom VAV/RTU hybrid systems requiring duct-mounted 4–20mA sensing

Related
duct humidity sensor with temperature output
3% RH zone sensor for Trane RTUs
BAYSENS037A duct sensor
SEN01178 Trane humidity sensor
HVAC 4–20mA duct mount sensor
polymer capacitive RH sensor
thermistor 10k humidity probe

Common Requests
“Is the BAYSENS037A the same as 4190-7020?”
Yes, both are OEM part numbers for the same sensor.
“What Trane systems use the SEN01178 sensor?”
Multiple YHC, THC, and YHD series rooftop and gas/electric units.
“Does this sensor output both temp and RH?”
Yes – temp via thermistor (10kΩ) and RH via 4–20mA analog output.
“Is it compatible with Tracer controls?”
Fully compatible with Tracer SC+, Tracer Summit, and legacy systems.
“Can I use this in place of a duct-mounted BACnet sensor?”
Only if your control board accepts 4–20mA signals (no native BACnet).

All product names, trademarks, and registered trademarks are the property of their respective owners. Use of these names does not imply any affiliation or endorsement.

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