025-52739-000 LIQUID TEMPERATURE SENSOR

025-52739-000 LIQUID TEMPERATURE SENSOR – Precision Immersion Temperature Transmitter

The 025-52739-000 LIQUID TEMPERATURE SENSOR (Part Numbers: 025-52739-000 / S1-02552739000) is a high-accuracy thermistor-based temperature probe designed specifically for liquid line immersion monitoring in commercial HVAC, industrial refrigeration, and liquid chiller units. Engineered by Johnson Controls for York systems, this heavy-duty immersion sensor continuously measures entering and leaving water or glycol temperatures across evaporator and condenser circuits to optimize energy efficiency and system control.

Operating with high thermal conductivity and rapid response time, the 025-52739-000 LIQUID TEMPERATURE SENSOR communicates directly with York MicroPanel, OptiView, and ISN electronic control boards. Built with a corrosion-resistant metallic probe sheath, integrated strain-relief strain boot, and pre-wired harness terminated with a moisture-resistant 2-pin connector plug, it guarantees dependable thermal feedback in high-moisture mechanical environments.

As shown in the product image, the sensor unit comprises a long copper-alloy immersion probe barrel, a threaded plastic mounting fitting with strain relief gland, and a flexible shielded lead wire ending in an insulated 2-pin locking terminal connector.

Key Features of the 025-52739-000 LIQUID TEMPERATURE SENSOR

High Thermal Accuracy & Sensitivity: Precision-matched NTC thermistor element provides tight-tolerance temperature tracking for entering and leaving liquid lines.
High-Conductivity Metallic Probe Sheath: Durable metal probe casing maximizes heat transfer between the fluid stream and internal sensing element for minimal response lag.
Integrated Threaded Fitting Gland: NPT threaded fitting allows direct insertion into system thermowells or fluid pipes while protecting internal wiring from mechanical stress.
Pre-Terminated Sealed Cable Assembly: Factory-fitted wiring harness equipped with a 2-pin plug for quick plug-and-play installation on York control panels.
Corrosion & Moisture Resistance: Protective boot sealing guards the internal wiring against condensation, oil spray, and ambient humidity.
Direct OEM Fit: Functions as the exact factory replacement part for legacy cross-reference part numbers 025-47669-000 and S1-02552739000.

Common Applications and Practical Usage

The thermal precision and rugged build of the 025-52739-000 LIQUID TEMPERATURE SENSOR make it an essential monitoring component across HVAC/R installations:

Chilled Water System Control: Monitors entering and leaving chilled water temperatures (LCHWT) at the evaporator bundle to govern compressor loading.
Condenser Water Line Tracking: Tracks condenser water supply and return lines to prevent thermal overload and control cooling tower fan staging.
Freeze Protection Safeguard: Delivers real-time low-temperature feedback to trigger safety shutdowns before fluid freezes inside heat exchanger tubes.
Industrial Process Cooling: Provides liquid temperature input for automated motion controls and process fluid loops in commercial facilities.

Technical Specifications

The core physical, electrical, and compatibility parameters for the 025-52739-000 LIQUID TEMPERATURE SENSOR are detailed below:

Parameter Specification	Technical Details & Operational Values
Component Classification	HVAC/R Liquid Immersion Temperature Sensor
Primary Target Keyword	025-52739-000 LIQUID TEMPERATURE SENSOR YORK
Manufacturer / Part Number	York (Johnson Controls) / `025-52739-000`
Cross-Reference Numbers	`S1-02552739000`, `025-47669-000`, `208X20`
Sensor Type / Element	NTC Thermistor Probe
Primary Application	Entering / Leaving Liquid Temperature Sensing
Probe Material	Copper-Alloy / Brass High-Conductivity Sheath
Cable Termination	2-Pin Locking Electrical Connector Plug
Operating Temperature Range	$-40^circtext{C to }+105^circtext{C}$ ( $-40^circtext{F to }+221^circtext{F}$ )
Mounting Mechanism	Threaded NPT Compression Fitting / Well Insertion

Operating Guidelines and Installation Tips

INSTALLATION TIP: Always insert the probe into a thermowell coated with thermal conductive grease (heat transfer compound) to ensure maximum thermal contact and accurate reading response.

Leak Prevention: Do not overtighten the threaded plastic gland during mounting; ensure the rubber O-ring seal seats properly against the thermowell port.

Wiring Protocol: Ensure the 2-pin harness is routed away from high-voltage motor power leads or VFD cables to avoid electrical noise interference on sensitive analog temperature signals.

To review official engineering guidelines for liquid chilling packages and thermal measurement standards, consult the official AHRI Standard 550/590 Performance Rating Directory.

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