Nexisense WT-CWF-J01 Droplet Temperature Sensor | High-Precision NTC Solution, Empowering Multi-Domain System Integration

In the fields of industrial control, smart home appliances, new energy, and automotive electronics, temperature as a core process variable directly affects system efficiency, safety, and lifespan. The Nexisense WT-CWF-J01 droplet NTC temperature sensor is based on mature negative temperature coefficient thermistor technology, combined with precision glass sealing process and epoxy encapsulation design, providing B-end integrators with cost-effective, highly reliable temperature sensing elements. This module achieves excellent linearity and long-term stability in the wide temperature range of -20℃ to 105℃, helping projects achieve precise closed-loop control and fault warning.

Core Measurement Principle of NTC Thermistor

WT-CWF-J01 adopts a typical NTC thermistor (Negative Temperature Coefficient), where its resistance value R and temperature T follow the Steinhart-Hart equation or the simplified β parameter model:

R_T = R_25 × exp(β × (1/T - 1/298.15))

where the β value is typically in the 3000–4000K range, and the 25℃ reference resistance can be customized (such as 10kΩ, 50kΩ, etc.). Temperature increase causes exponential resistance decrease. Through ADC acquisition of divided voltage or direct resistance measurement, it is converted to temperature value via lookup table or fitting algorithm.

Compared with Pt100/1000 RTD or thermocouples, NTC has higher sensitivity (dR/dT up to -4–-6%/℃) in this temperature range, response time constant τ typically<5s (in water medium), suitable for fast dynamic monitoring scenarios. At the same time, glass-sealed chip + double-layer epoxy encapsulation provides IP67 waterproof and dustproof capability, resistant to mechanical vibration and chemical corrosion.

Key Engineering Characteristics and Performance Indicators

• Accuracy and Interchangeability: 25℃ resistance tolerance ±1%, B value tolerance ±1% (typical 3950K), batch consistency through strict sorting, ensuring direct interchange without point-by-point calibration.

• Measurement Range and Response: -20℃ to +105℃, typical time constant<8s (in air), <3s (liquid contact).

• Electrical Characteristics: Operating voltage DC 3–5V (recommended voltage divider circuit), insulation resistance >100MΩ (500VDC), withstand voltage >1500VAC/1min.

• Mechanical and Environmental Adaptation: Probe diameter ≈5–6mm, droplet-shaped epoxy encapsulation, lead AWG26–28 PVC/silicone/Teflon optional, bending resistance >100,000 times, vibration 10–55Hz 1.5mm.

• Long-term Stability: Drift<0.3℃ after 1000h high-temperature aging at 105℃, suitable for continuous operation scenarios.

These parameters enable WT-CWF-J01 to meet industrial-grade reliability requirements under cost-controlled conditions.

Typical Application Scenarios and Integration Value

The versatility and compact design of WT-CWF-J01 make it widely suitable for the following engineering projects:

Home Appliances and White Goods Systems

Embedded in air conditioner evaporators/condensers, refrigerator freezer compartments, water heater inner tanks, to achieve over-temperature protection, defrost control, and constant temperature regulation. The probe can directly contact the medium or adhere to the pipe wall, supporting MCU interrupt-triggered protection logic, reducing reliance on mechanical thermostats.

New Energy and Energy Storage Management

Photovoltaic inverter IGBT module heat dissipation monitoring, energy storage battery PACK surface/core temperature acquisition. NTC high sensitivity supports early BMS thermal runaway warning (temperature gradient dT/dt threshold judgment), compliant with UL 1973 and IEC 62619 safety standards.

Automotive Electronics and Thermal Management

EV/HEV battery module temperature monitoring, cabin outlet air temperature control, engine coolant circuit. Vibration resistance and wide temperature characteristics ensure AEC-Q100 level compatibility, leads can add shielding layer to reduce EMI interference.

Industrial and Agricultural Environmental Control

Breeding farm temperature-controlled ventilation, greenhouse soil/air temperature acquisition, large drying equipment process monitoring. Waterproof encapsulation adapts to high-humidity, dusty conditions, supporting RS485 gateway multi-point acquisition.

Selection Guide: Key Parameters for Matching Project Requirements

To optimize system integration, it is recommended to select according to the following points:

Recommended voltage divider circuit: NTC in series with precision resistor, Vout connected to 10–12 bit ADC, software implements Steinhart-Hart third-order fitting or piecewise linear interpolation.

System Integration Notes and Best Practices

• Circuit Design: Use constant current excitation or voltage divider method to avoid self-heating error (excitation current<100μA); add low-pass filtering to suppress noise.

• Installation Position: Probe needs good thermal contact (thermal grease assistance), avoid thermal bridges and air gaps; in liquid medium, vertical installation recommended to prevent air bubbles.

• EMC Considerations: Leads away from high-power harnesses, add ferrite beads or shielding layer; PCB layout isolates analog ground.

• Calibration and Compensation: Perform single-point or two-point field verification before batch deployment, software compensates for probe thermal inertia delay.

• Fault Diagnosis: Monitor open/short circuit (resistance exceeds threshold), integrate watchdog mechanism to prevent temperature runaway.

OEM Customization and Bulk Supply Advantages

Nexisense provides comprehensive support for B2B partners:

• Custom resistance value, B value, accuracy range, and temperature-resistance curve.

• Lead length, color, terminal type, encapsulation shape adjustment.

• Brand silk screen, special packaging, anti-static trays.

• Factory grouping calibration and batch traceability report.

• Long-term supply agreement, buffer inventory, fast sample delivery.

These services help integrators shorten development cycles, stabilize supply chains, and achieve product differentiation.

Frequently Asked Questions

1. What are the main performance differences between WT-CWF-J01 and Pt100 in the same temperature range?

 NTC has higher sensitivity, lower cost, faster response, but poorer linearity requiring software compensation; Pt100 has good linearity, high accuracy but small self-heating, suitable for higher precision or wider temperature range projects.

2. How to reduce the impact of NTC self-heating error on measurement accuracy?

 Control excitation current<50–100μA, use pulse sampling mode, or adopt four-wire connection to compensate lead resistance.

3. How is the probe's durability under long-term immersion in liquid medium?

 Double-layer epoxy + glass-sealed chip design, typical 105℃ water immersion 1000h without significant drift; extreme chemical media recommend Teflon leads and additional sheath.

4. How is interchangeability between bulk products guaranteed?

 Factory multi-point calibration in constant temperature bath and grouping screening, strict control of 25℃ resistance and B value tolerance, achieving <±0.5℃ interchange error.

5. Which common MCU interfaces are supported?

 Direct voltage divider access to ADC (such as STM32, ESP32 12-bit SAR ADC), or external high-precision ADC module; software lookup table or fitting algorithm has strong compatibility.

6. Does it meet vibration and thermal cycling requirements in automotive BMS applications?

 Probe withstands 10–2000Hz vibration and -40℃ to 125℃ thermal shock cycling, compliant with AEC-Q200-like mechanical environmental testing.

7. What is the customization development cycle and minimum order quantity?

 Conventional customization (such as leads/terminals) 4–6 weeks, special B value or encapsulation 8–12 weeks; MOQ depends on specifications, can be reduced to thousand-level in bulk.

8. How to control accuracy drift after long-term operation?

 Typical drift<0.3℃/year after 105℃ aging; system-level recommends single-point field verification every 12–24 months, or integrated reference channel self-diagnosis.

Conclusion: Choose Nexisense WT-CWF-J01 to Build a Reliable Temperature Perception Foundation

Nexisense WT-CWF-J01 droplet NTC temperature sensor, with high precision, consistency, sealing, and flexible customization features, provides efficient temperature monitoring solutions for home appliances, new energy, automotive, and industrial control projects. It helps system integrators reduce BOM costs, simplify calibration processes, and improve overall system reliability and response speed.

Welcome home appliance manufacturers, new energy solution providers, automotive electronics integrators, and project engineering teams to contact Nexisense for detailed specification sheets, sample test reports, or customization scheme discussions. We look forward to becoming your long-term partner in the field of temperature perception, jointly promoting continuous improvement in product performance and market competitiveness.