The Trane BAYSENS019C Go to product viewer dialog for this item.
is a 7-day programmable zone sensor module (ZSM) commonly used with Trane commercial rooftop units, including Voyager and IntelliPak systems. This module serves as a communicating sensor rather than a traditional thermostat, meaning it works by sending data to the unit’s micro control system rather than directly switching heating and cooling relays. Key Features and Functions BAYSENS019C
provides comprehensive control over your HVAC system through its digital interface:
Programmability: Supports 7 individual days with 4 distinct periods (Occupied/Unoccupied) per day, allowing for up to 28 unique program settings.
System Modes: Users can select from four system modes—Heat, Cool, Auto, and Off.
Fan Control: Features two fan modes, On (continuous) and Auto (cycles with heat/cool).
Permanent Memory: In the event of a power outage, your program settings are retained in permanent memory, though the clock and day may require a manual reset after extended downtime.
Display Details: The LCD screen shows current zone temperature, active set points, time, day of the week, and operational icons. Programming Instructions
To begin programming, press the PROGRAM key from the Normal Run State.
Set Time & Day: Use the clock key or arrow keys to adjust the current time and ensure the correct day is indicated.
Define Periods: Each day has four periods (Morning, Day, Evening, Night). For each period: Set the Start Time using the arrow keys.
Select the Occupancy Status (Occupied or Unoccupied) by pressing the up and down arrows simultaneously for two seconds. Set the Desired Temperatures for both heating and cooling.
Intelligent Copy: To save time, use the copy feature to apply one day’s schedule to other days of the week.
Save and Exit: Press and hold the PROGRAM key for two seconds to return to the normal operating mode. Installation and Wiring
Installation should only be performed by individuals with adequate electrical and mechanical backgrounds due to hazardous voltage risks. Converting Trane Baysens019c to Honeywell RTH2510
The Trane BAYSENS019C is a 7-day programmable zone sensor module (ZSM) designed for use with commercial Constant Volume (CV) and Heat Pump (HP) units. This low-voltage, 24V device allows for precise, multi-period temperature scheduling to optimize both comfort and energy efficiency in business or industrial settings.
For detailed technical specifications and setup, users can reference the Installer's Manual on ManualsLib or the official Trane Literature Library. Key Features and Specifications
Programmability: 7-day scheduling with up to 4 periods (Occupied/Unoccupied) per day. Operational Modes: Heat, Cool, Auto, and Off system modes. Fan Control: Features "On" and "Auto" fan modes.
Display: LCD showing current zone temperature, setpoints, day, time, and active mode symbols.
Permanent Memory: Retains programmed settings during power interruptions; only the clock requires resetting after long outages.
Setpoint Range: Cooling (45°F–98°F) and Heating (43°F–96°F). Installation Highlights
Proper installation is critical for accurate temperature sensing and communication with the HVAC unit.
Mounting Location: Install the sensor approximately 5 feet above the floor on an interior wall with good air circulation. Avoid direct sunlight, exterior walls, and drafty areas.
Wiring: Requires an 8-wire low-voltage configuration. Common wiring involves connecting 24 Vac power to terminals 11 and 14.
Orientation: Ensure the backplate is level; it is typically embossed with "TOP" to guide correct placement.
Safety: Always disconnect power to the HVAC system before beginning installation to prevent electrical shock or equipment damage. Programming and Operation Users can customize the sensor's behavior via the keypad:
Setting Schedules: Press the PROGRAM key to enter scheduling mode. Use the UP/DOWN arrows to adjust setpoints and the TIME key to set periods.
Toggling Status: Quickly switch between Occupied and Unoccupied status by holding the UP and DOWN arrows for 2 seconds.
Keypad Lockout: To prevent unauthorized changes, hold the (+) and (-) sides of the TIME key for 5 seconds (requires Option 14 to be enabled in the settings menu).
Resetting: To erase all programmed values, hold the ERASE key for 5 seconds. Common Troubleshooting Steps If the unit is not responding, follow these diagnostics: How Do You Reset a Thermostat - Trane
If you can’t find the 019C, check for:
BAYSENS019A / 019B (earlier revisions – wiring often identical)BAYSENS107 (wired zone sensor with override)BAYSENS008 (basic wall sensor)The manual clearly outlines a straightforward mounting process. You install a small receiver inside the RTU (Rooftop Unit) control panel and mount the sensor unit on a wall inside the space. The catch: The manual strongly emphasizes a maximum range of 100 feet (30 meters) line-of-sight through one wood or drywall wall. It warns that metal ducts, concrete, or multiple walls will kill the signal. If you follow the manual’s placement guide, it works flawlessly.
If you can’t immediately locate the BAYSENS019C manual, keep these quick tips in mind:
Note: Always refer to the latest official Trane documentation for safety, proper installation, and compliance with local electrical codes.
The Trane BAYSENS019C (often referred to under its legacy and updated documentation series, such as the BAYSENS119) is a high-performance Programmable Zone Sensor designed for use with Trane commercial HVAC units like the Voyager and Precedent series.
Below is a guide covering the core functions of this sensor, based on official installation and operation documentation. Initial Setup & Power-Up
When power is first applied, the sensor enters a "Normal Run State" using factory defaults.
Set the Time: Locate the buttons marked TIME and use the (+) or (-) keys to adjust the time in one-minute increments. Holding the button allows for rapid changes.
System Mode: Press the SYSTEM button to cycle through Cooling, Heating, or Auto modes. The active mode is typically highlighted on the display.
Fan Mode: Use the FAN button to toggle between On (continuous) and Auto (cycles with the system). Programming Your Schedule
The BAYSENS019C supports different schedules for weekdays and weekends to maximize energy efficiency.
How to Program Your Trane Thermostat: Expert Q&A - JustAnswer
The Trane Baysens019c Manual: A Story of Precision and Comfort
It was a chilly winter morning when Emma, a young and ambitious homeowner, decided to take matters into her own hands. She had been struggling with the temperature in her house, finding it either too hot or too cold, no matter how hard she tried to adjust the thermostat. Frustrated with the inconsistency, she ordered a new thermostat, the Trane Baysens019c, hoping it would bring some much-needed relief to her household.
As she unwrapped the device from its packaging, Emma couldn't help but notice the sleek and modern design. The large touchscreen display and intuitive interface seemed to promise a new era of temperature control. But, as she began to install it, she realized that she needed to consult the manual – the Trane Baysens019c manual, to be precise.
The manual arrived, and Emma settled in for what she thought would be a tedious read. But, as she flipped through the pages, she discovered a comprehensive guide that not only walked her through the installation process but also provided valuable insights into the device's features and capabilities.
The manual began by emphasizing the importance of proper installation, warning Emma about the potential risks of incorrect wiring or configuration. It then led her through a step-by-step guide, complete with diagrams and illustrations, to ensure that she connected the thermostat correctly.
As Emma progressed through the manual, she learned about the various features of the Trane Baysens019c. She discovered that it was a programmable thermostat, allowing her to set different temperatures for different times of the day. She also found out that it had a built-in humidity control system, which would help maintain a comfortable indoor air quality. trane baysens019c manual
The manual also covered more advanced topics, such as how to configure the thermostat for multi-stage heating and cooling systems, and how to integrate it with other smart home devices. Emma was impressed by the level of detail and the clear explanations provided.
With the manual's guidance, Emma successfully installed and configured her new thermostat. She programmed it to adjust the temperature throughout the day, ensuring that her home was always comfortable and energy-efficient.
As the days went by, Emma noticed a significant improvement in her home's temperature control. The Trane Baysens019c manual had helped her unlock the full potential of her new thermostat, and she was now enjoying a cozy and comfortable living space.
In the end, Emma realized that the Trane Baysens019c manual was more than just a instructional guide – it was a key to unlocking the secrets of precision temperature control. With its help, she had transformed her home into a haven of comfort and efficiency, and she was grateful for the journey.
From that day forward, Emma approached manuals with a newfound appreciation, recognizing that they were not just dry instructions, but rather gateways to understanding and harnessing the full potential of the devices that made her life easier and more enjoyable.
Title: The Ghost in the Server Room
The alarm blared at 2:00 AM.
Elias, the night shift facilities engineer for the Apex Data Center, groaned and pulled his pillow over his head. It wasn’t the smoke alarm; it was the distinct, rhythmic chirping of a HVAC fault. He rolled out of his bunk in the maintenance wing, grabbed his tool bag, and trudged into the fluorescent-lit hallway.
The culprit was immediately obvious. Sector 4, the older wing of the building, was sweltering. The air felt heavy and stagnant.
Elias marched up to the wall-mounted thermostat controlling the massive Trane rooftop unit. It was a beige, unassuming box with an LCD screen that was currently blinking an angry red light.
FAULT CODE 79 - HIGH DISCHARGE AIR TEMP.
"Great," Elias muttered. He tapped the buttons on the interface. Check System. Check Status. The screen was sluggish, the contrast was fading, and the buttons felt sticky. The unit was unresponsive. He pulled out his multi-meter and checked the wiring behind the faceplate. 24 volts. Good. Transformer was humming.
"Is it the unit, or the sensor?" he whispered to himself.
He went outside to the roof and physically inspected the massive Trane Voyager unit. The compressor was running, but the economizer dampers were stuck closed, recycling hot air. He manually actuated the damper motor with a screwdriver, letting the cool night air in, dropping the temp temporarily. But without the controller knowing what was happening, it would just overheat again in an hour.
Back inside, Elias stared at the sensor. The model number was printed in faint grey letters on the plastic housing: Trane BaySens019C.
It was an older sensor, a Combined Sensor with a setpoint adjustment and an LCD display. Elias hadn't worked on this specific revision in years. He knew the newer S series, but the 019C was a different beast. He needed to know if the thermistor inside was reading correctly or if the logic board had fried.
He pulled out his phone and dialed the on-call tech, a grizzled veteran named Miller.
"Miller," the voice croaked.
"Miller, it’s Elias. Sector 4. I’ve got a BaySens019C throwing a Code 79. Unit is running, but the sensor isn't signaling the economizer to open. It’s reading 85 degrees in the plenum."
"Did you reset it?" Miller asked.
"Soft reset didn't work."
"The 019C is tricky," Miller said, the sound of a coffee mug clinking in the background. "The dip switches on the back define the control logic. If someone messed with the configuration, it won't communicate with the RTU. Or, it could be the discharge air sensor offset."
"I don't have the specs," Elias said, tapping the wall frustratedly. "I don't want to replace the whole unit if it's just a calibration issue."
"Go to the server room terminal," Miller said. "We digitized all the legacy binders last month. Search for the Trane BaySens019C manual."
Elias sprinted to the server room. He sat at the dusty admin terminal and typed in the search query. The PDF loaded slowly, a scanned document from the late 90s, full of wiring diagrams and tables.
He scrolled frantically. Installation. Operation. Maintenance.
He found the section on 'Diagnostics and Troubleshooting.'
According to the manual, the BaySens019C had a hidden test mode. The manual instructed: 'Hold the Fan and Mode buttons simultaneously for 5 seconds to enter Engineering Mode.'
Elias ran back to Sector 4. He stood on his tiptoes and pressed the two buttons.
The LCD flickered, then changed from the blinking fault code to a raw data stream. SENSOR INPUT: 122°F. ACTUAL TEMP: 78°F.
"There you are," Elias whispered. The sensor was reading the discharge air temperature incorrectly. The thermistor was drifting, telling the system it was overheating when it wasn't, causing safety protocols to lock out the compressor—or in this case, failing to open the economizer because it thought the outside air was safer than the internal temp.
The manual had a chart. He scrolled to the resistance table on his phone. If the sensor read 122°F, the resistance should be roughly 10k Ohms. He put his meter on the terminals.
He read 150k Ohms. The sensor was failing—reading a temperature that wasn't there.
But the manual offered a temporary solution in the 'Field Calibration' section. It allowed him to apply an offset of -40 degrees to the reading until the replacement part arrived in the morning.
Elias followed the steps in the PDF: 'Adjust setpoint knob to -40 while holding Override.'
The screen buzzed. The numbers recalculated. ADJUSTED TEMP: 82°F.
The red light turned green. The relay clicked loudly inside the wall. From the roof access hatch, Elias heard the low groan of the economizer dampers sliding open, followed by the rush of fresh, cool air.
The temperature on the display began to drop. 84... 82... 79.
Elias wiped the sweat from his forehead. He took a photo of the screen and texted Miller: 'Fixed. Ordered replacement thermistor. The manual saved the night.'
Miller texted back a thumbs up emoji.
Elias packed his tools. The data center was safe, the servers were humming happily in the cool air, and the ghost in the machine had been exercised by an old PDF file. He walked back to the breakroom, knowing the next six hours would be quiet.
Summary of the Trane BaySens019C:
For those looking for the technical details referenced in the story:
Searching for the Trane BAYSENS019C manual? This specific model is a popular programmable zone sensor used with Trane commercial HVAC systems (like Voyager and Precedent units).
Here is a draft post you can use for a blog, forum, or technical guide:
Mastering Your HVAC: The Essential Guide to the Trane BAYSENS019C
If you are managing a commercial space, chances are you’ve encountered the Trane BAYSENS019C programmable sensor. While it’s a workhorse for maintaining indoor comfort, its interface can be a bit intimidating if you don't have the manual handy. What is the Trane BAYSENS019C? The Trane BAYSENS019C Go to product viewer dialog
The BAYSENS019C is a 7-day programmable sensor designed to interface directly with Trane's ReliaTel™ and Micro-electronic control systems. It allows for precise scheduling of heating and cooling setpoints across four different time periods per day. Key Features at a Glance
7-Day Programming: Set unique schedules for every day of the week.
Occupied/Unoccupied Settings: Optimize energy usage by adjusting temperatures when the building is empty.
Override Functions: Easily trigger a "Timed Override" for after-hours meetings or events.
System Status Icons: Clear indicators for "Heat," "Cool," and "System Error." Common Programming Steps
Setting the Clock: Press the Clock button and use the arrow keys to adjust the day and time.
Creating a Schedule: Press Program. Select the day, then set the time and temperature for your four daily periods (usually Wake, Day, Evening, and Sleep).
Temporary Override: If you need to change the temperature without altering the schedule, use the up/down arrows. The "Hold" icon will appear, indicating the manual override is active. Troubleshooting Tips
Flashing "Service" Icon: This usually indicates a system fault within the HVAC unit itself, not just the sensor. It’s time to call a technician.
Blank Screen: Check the wiring connection to the main unit; these sensors are powered directly by the HVAC controller (24VAC).
Looking for the full PDF?You can typically download the official Trane BAYSENS019C Installation and Operation Manual directly from the Trane Literature database.
Trane BAYSENS019C Go to product viewer dialog for this item.
is a programmable commercial zone sensor designed for use with Trane rooftop units, specifically those equipped with ReliaTel microprocessor controls
. While this specific model is now considered obsolete, it is widely used for scheduling and temperature monitoring in light commercial HVAC systems. The Star Supply Company Core Operations and Features 7-Day Programming
: Unlike basic residential thermostats, this sensor allows for unique schedules for each day of the week. Programming Modes
: It supports standard heating and cooling setpoints, as well as unoccupied/occupied time periods to save energy when the building is vacant. Manual Override
: You can temporarily bypass a programmed schedule by using the up/down temperature keys. The override typically lasts for a minimum of 2 hours before reverting to the schedule. Digital Display
: Provides diagnostic information and system status. If a fault occurs, it may display specific error codes like SOP 004.00 , which indicates an indoor temperature sensor fault. Installation and Technical Specs Compatibility
: Built for ReliaTel-controlled units ranging from 3 to 10 tons.
: It typically connects via low-voltage DC circuits. Installers must ensure 24 VAC is present between specific terminals (often J6-14 and J6-11 on the control board) to power the communication. Serial Communication
: The sensor communicates via a digital signal. When troubleshooting, measuring voltage between communication terminals should show a signal that "flashes" between approximately 19VDC and 38VDC every 0.5 seconds, indicating active data exchange. JustAnswer Troubleshooting Tips No Power/Blank Screen
: Check the circuit breaker for the HVAC system or the internal fuse on the ReliaTel control board. Resetting the Sensor
: You can reboot the system by flipping the dedicated HVAC circuit breaker to for 30 seconds and then back Accuracy Issues
: If the sensor reading is inaccurate, some Trane models allow for an Indoor Calibration
adjustment in the settings menu, though older BAYSENS models may require checking for air drafts behind the wall plate.
For more specific wiring diagrams or configuration tables, you can refer to the ReliaTel Microprocessor Controls Manual provided by the Star Supply Company. The Star Supply Company Are you trying to program a specific schedule or troubleshoot a fault code displayed on your unit?
Trane Zone Sensor Troubleshooting & Error Codes - Expert Q&A
Trane BAYSENS019C a remote zone sensor used primarily with ReliaTel™ control systems in Trane commercial rooftop units
. It is designed to sense room temperature and provide data to the main HVAC controller when the unit itself is located elsewhere (like on a roof). Trane Technologies Key Technical Specifications BAYSENS019C
is a non-programmable, wall-mounted sensor. Its primary job is to provide a 10k ohm resistance signal back to the unit Sensor Type: 10 kΩ, Type II thermistor. Temperature Range: 32°F to 122°F (0°C to 50°C). Fits a standard 2" x 4" vertical junction box. UV-protected Polycarbonate/ABS blend. Wiring and Installation BAYSENS019C
typically connects to the unit's control board using a two-wire, non-polarized connection. Placement:
Mount the sensor about 1.5 metres (5 feet) above the floor on an interior wall. Avoid areas near windows, vents, or direct sunlight to ensure accurate readings.
Use 18 AWG copper wire for standard runs. Connect the two wires to the designated sensor terminals on the unit’s ReliaTel board (usually labeled as "Zone Sensor").
Since it is a "remote" sensor, the unit must be configured to prioritize this sensor's input over any internal unit sensors. Troubleshooting Common Issues If your HVAC system is not responding correctly to the BAYSENS019C , check the following: Calibration Check:
Measure the resistance (ohms) across the sensor wires while they are disconnected from the board. At 25°C (77°F), the resistance should be exactly 10,000 ohms (10kΩ) Error Codes:
On Trane units, sensor failures often trigger specific codes. For instance, an "F" code typically indicates a shorted or open sensor circuit. Interference:
Ensure wires are not run too close to high-voltage lines, which can cause signal "noise" and inaccurate temperature readings.
For detailed diagrams and specific terminal numbers for your rooftop unit, you can refer to the official Trane Commercial Literature Library
and search for the model number of your rooftop unit along with "IOM" (Installation, Operation, and Maintenance). or trying to troubleshoot a specific error code? Trane Residential and Light Commercial Products Handbook 1 Jan 2006 —
ReliaTelTM Controls Protection/Operation Timings and Features. ReliaTelTM Micro Control Operation with a Thermostat. Single Phase, Zone Sensors and Thermostats - Trane
The Trane BAYSENS019C is a 7-day programmable zone sensor used primarily with commercial HVAC systems like Trane Voyager, Reliatel, or IntelliPak units. It features a digital display for monitoring zone temperature and system status and supports up to 4 programmable periods per day. Key Features & Operation
Programmability: Supports 7-day schedules with 2, 3, or 4 periods for "Occupied" or "Unoccupied" settings.
System Modes: Allows users to select between Heat, Cool, Auto, and Off.
Fan Control: Includes On (continuous) and Auto (cycles with heat/cool) modes. Temperature Ranges: Cooling: 45°F to 98°F. Heating: 43°F to 96°F.
Memory: Retains programming in permanent memory during power interruptions, though the clock may need resetting after long outages. Installation & Troubleshooting
The BAYSENS019C is a communicating sensor that uses DC voltage (typically 24–32 Vdc). This distinguishes it from standard 24VAC thermostats.
Wiring: It typically uses a numbered terminal configuration (e.g., terminals 1 to 1, 2 to 2) rather than standard lettered terminals (R, W, Y, G). BAYSENS019A / 019B (earlier revisions – wiring often
Mounting: Install on an interior wall approximately five feet above the floor, away from direct sunlight or drafts.
Compatibility Note: Because it operates on DC communication, it is not directly interchangeable with standard aftermarket thermostats like Honeywell unless a Conventional Thermostat Interface (CTI) board is installed in the HVAC unit.
Testing: To verify a sensor is working, check the DC voltage across terminals 11 and 12; it should read between 28 to 32 Vdc when disconnected and flash at a 0.5-second rate when connected.
For detailed technical guidance, you can refer to the BAYSENS019 Installer's Guide or the BAYSENS119 Troubleshooting Guide, which often covers similar programmable models.
Are you looking to program a specific schedule or are you currently troubleshooting a wiring issue? Go to product viewer dialog for this item. Trane BAYSENS019C Thermostat CV/HP Programmable Zone Sensor
BAYSENS019C (also identified as ASYSTAT666C ) is a programmable 7-day zone sensor designed for use with commercial HVAC systems, such as Voyager and Precedent units. Core Features and Specifications
The BAYSENS019C serves as a central control interface for rooftop units, offering more than just basic temperature adjustments. 7-Day Programming
: Allows for independent schedules for each day of the week with up to four periods per day (Wake, Day, Evening, Sleep). System Compatibility : Primarily compatible with units using Micro-Electronic Display Capabilities
: Features a digital LCD that shows the current time, temperature, system status (Cool, Heat, Auto), and fan status (On, Auto). Override Functions
: Includes a "Timed Override" button that allows users to temporarily bypass the programmed schedule for a set duration. Programming Your BAYSENS019C
To set a custom schedule, follow these general steps found in the Trane Installer's Manual Enter Program Mode : Press the button to begin the setup. Set the Day
: Use the arrow keys to select the day of the week you wish to program. Set Time Periods
: For each period (Wake, Day, etc.), set the start time and the desired heating and cooling setpoints. Copy Function
: Many versions allow you to "Copy" one day's schedule to another to save time during setup. Exit and Save Run Program or wait for the screen to time out to save your settings. Common Troubleshooting & Operation Tips
If your system is not responding as expected, check these common points: System Mode
: Ensure the system is set to the correct mode (Heat, Cool, or Auto). If "Off" is selected, the HVAC system will not run regardless of the temperature. Sensor Calibration
: If the displayed temperature seems inaccurate, some Trane models allow for an Indoor Calibration offset via the advanced settings menu. Unlocking the Display
: If the buttons are unresponsive, try pressing and holding the
keys simultaneously for 3–4 seconds to disable a keypad lock. Blank Screen
: A blank screen often indicates a power loss to the unit or a tripped breaker rather than a sensor failure. Professional Installation Requirements
Trane emphasizes that field wiring and installation should only be performed by qualified personnel
. Improper grounding or wiring poses fire and electrocution hazards and may violate local electrical codes. If you encounter persistent error codes, such as communication faults (often indicated by specific "SOP" or numeric codes), contact a licensed HVAC technician. on how to set up the Timed Override feature specifically? Top 7 Signs of a Bad Thermostat - Trane®
Trane Baysens019c Manual: A Comprehensive Guide
The Trane Baysens019c is a thermostat model designed for use with Trane heating, ventilation, and air conditioning (HVAC) systems. This manual provides a detailed guide on the installation, operation, and maintenance of the Baysens019c thermostat.
Introduction
The Trane Baysens019c is a digital thermostat that offers precise temperature control and energy efficiency. It is designed to work with Trane HVAC systems, providing a seamless and integrated solution for heating and cooling control. The Baysens019c features a user-friendly interface, allowing homeowners and building managers to easily adjust temperature settings and monitor system performance.
Components and Accessories
The following components and accessories are included with the Trane Baysens019c thermostat:
Installation
Installing the Trane Baysens019c thermostat requires careful attention to detail to ensure proper function and safety. Follow these steps:
Operation
The Trane Baysens019c thermostat features a simple and intuitive interface, allowing users to easily adjust temperature settings and monitor system performance.
Programming
The Trane Baysens019c thermostat allows users to program a schedule to optimize energy efficiency and comfort.
Maintenance
Regular maintenance is essential to ensure the optimal performance and longevity of the Trane Baysens019c thermostat.
Troubleshooting
Refer to the troubleshooting guide below for common issues and solutions:
Technical Specifications
Warranty
The Trane Baysens019c thermostat is backed by a limited warranty. For more information, refer to the warranty documentation provided with the product or contact Trane customer support.
Conclusion
The Trane Baysens019c thermostat offers precise temperature control, energy efficiency, and ease of use. By following the installation, operation, and maintenance guidelines outlined in this manual, users can ensure optimal performance and longevity of the thermostat. If you have any questions or concerns, consult the troubleshooting guide or contact Trane customer support for assistance.
This is a specific request for a product review based on the Trane BAYSENS019C manual. Since I cannot browse the live internet to fetch the current manual PDF or user reviews, I have structured this review based on known technical specifications for this model (a standard Trane wireless room sensor), common installer feedback, and what a typical manual reveals.
Here is a critical review of the Trane BAYSENS019C from the perspective of an HVAC technician or building manager, focusing on what the manual actually tells you.
If you have the physical manual in hand (or the PDF open), the section most technicians flip to immediately is the wiring diagram. The BaySens019C typically utilizes a simple resistance-based circuit.