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 2KΩ 
 Temperature sensors 

Compact NTC thermistor offering reliable temperature sensing for embedded systems and electronic circuits.

 Maximum precision
+/- 0,20°K

 Minimum temperature
-50°C

 Maximum temperature
+150°C

 Minimum dimensions
2 x 10

Response time

Fast

 Drift

Low

 Self-warming
Low

Price
Low

What is a 2KΩ sensor ?Operating principleTechnical SpecificationsWiring ConfigurationSelf-warmingApplication areas

What is a 2KΩ sensor ?

The NTC 2 kΩ is a negative temperature coefficient thermistor, presenting 2,000 Ω at 25 °C.

It offers higher sensitivity than the 1 kΩ, while maintaining stable and predictable behavior in the range of −50 to +150 °C.

The higher the nominal resistance, the lower the measurement current, reducing self-heating.

Operating principle

Like all NTCs, the resistance decreases exponentially with temperature according to the Steinhart–Hart law:

1/T = A + B · ln(R) + C · [ln(R)]³

or according to the simplified model with constant β:

R(T) = R₂₅ × e^{β (1/T - 1/T₂₅)}

where:

• R₂₅ = 2000 Ω 

• β ≈  3900 K

Technical specifications

Parameter Typical value

Nominal resistance (25 °C)

 2 000 Ω ±1 %
Constant β 3500–3950 K

Sensitive material

Metallic oxide (Mn, Ni, Co)

Type of case Epoxy / glass / pearl

Maximum measurement current

0.5 mA (to limit self-heating)

Response time

0.3 to 1 s depending on the medium

Linearity

Nonlinear

Operating temperature

−50 → +150 °C

Lifetime

100,000 thermal cycles

Wiring Configuration

The 2 kΩ NTCs are generally wired in a voltage divider for a voltage reading proportional to the temperature.

 +Vcc
   │
  [Rfixe]
   │────► ADC (µC)
  [NTC 2kΩ]
   │
  GND

The output voltage Vout depends directly on the resistance of the thermistor:

V_out = V_cc × (R_NTC / (R_fixe + R_NTC))

Self-warming

Thanks to a higher resistance, the measurement current is half that of a 1 kΩ, further limiting self-heating to < 0.03 °C.

Application areas

⚙️ Regulation and temperature control in embedded electronics

🧱 Thermal measurement in printed circuits and power supplies

💧 Probes for fluids, air, or gas

🧠 Thermal compensation in converters or sensors

🔋 Battery monitoring and power modules


Should I choose a 2KΩ sensor ?

Strengths points

  • ⚙️ Increased thermal sensitivity
         → The 2 kΩ offers better measurement resolution around ambient temperature than the 1 kΩ, making it ideal for fine regulation systems.
  • 🔥 Low self-heating→ Thanks to its doubled resistance, the current passing through the sensor is reduced, limiting the internal thermal drift to less than 0.03 °C.
  • 💶 Good cost/accuracy compromise
         → An excellent price/stability/speed ratio, perfect for industrial devices, HVAC, and consumer use.
2kΩ sensors

Weaknesses points

  • 📉 Nonlinear response
         → Like all NTCs, it requires software correction (table or equation β) to provide an accurate temperature.
  • 🌡️ Restricted use area
         → Less suitable for environments above +150 °C, unlike Pt100 type RTDs.
  • 🔋 Sensitivity to dissipation
         → The errors may increase if the fixed resistance of the bridge is not precisely chosen.

Useful information

Here is some useful information regarding the 2KΩ sensors.

(NTC 2 kΩ at 25 °C, beta constant = 3950 K)

Temperature (°C) Resistance (Ω) Temperature (°C) Resistance (Ω)
−50 49 884 60 586
−40 31 606 70 441
−30 20 338 80 337
−20 13 416 90 260
−10 8 968 100 203
0 6 091 110 160
10 4 189 120 127
20 2 948 130 101
25 2 000 140 81
30 1 372 150 65
40 952 160 52
50 672 170 42

💡 On observe une décroissance exponentielle de la résistance : typique d’une thermistance NTC.

Class / Tolerance
 Tolerance at 25 °C (R25)
 Max error on T° (−40 → +125 °C)
 Typical usage
±1 % ±20 Ω ±0,2 K Instrumentation / precision measurement
±2 % ±40 Ω ±0,4 K Industrial Control / HVAC
±3 % ±60 Ω ±0,6 K Embedded electronics
±5 % ±100 Ω ±1 K Consumer applications / security
🔹 The sealed glass versions ensure the best long-term stability (≤ 0.05 K/year).

General equation:

1/T = A + B · ln(R) + C · [ln(R)]³


For an NTC 2 kΩ (β = 3950 K), typical coefficients:

  • A = 1,4051 × 10⁻³
  • B = 2,369 × 10⁻⁴
  • C = 1,019 × 10⁻⁷


🔹 Example 1: temperature from R

R = 1372 Ω

ln(1372) = 7,224

1/T = 1,4051e−3 + 2,369e−4 (7,224) + 1,019e−7 (7,224)³ = 3,09e−3

T = 323,7 K = 50,6 °C

✅ Measured temperature ≈ 50 °C


🔹 Example 2: resistance from T

T = 80 °C = 353.15 K

R = R₂₅ · e^(β(1/T − 1/T₂₅))

R = 2000 · e^(3950 × (1/353,15 − 1/298,15)) = 337 Ω

✅ Expected resistance ≈ 337 Ω

The 2 kΩ NTC is commonly used in a voltage divider connected to an ADC converter (microcontroller or measurement module).

🔹 Typical components

Composant Function
NTC 2 kΩ Temperature detection
R fixed (2 kΩ) Bridge reference
Microcontroller Lecture ADC 10–12 bits
Power Supply 3.3 / 5 V Source stable
100 nF capacitor Noise filtering
🔹 Functional diagram (ASCII)
  +3.3V / +5V
       │
     [Rfixe]
       │────► ADC (microcontroller input)
     [NTC 2kΩ]
       │
      GND
💡 The microcontroller calculates the temperature from the measured voltage using the Steinhart–Hart equation or a calibrated table.

 We integrate any sensor into any probe 

Smooth tube probe

 Smooth tube 

Waterproof probe

 Waterproof

Bayonet probe

 Bayonet

Slot probe

 Slot

Ambient probe

 Atmosphere

Connection head probe

Termal block

Stick-in probe

Stick-in

Thread probe

Thread

Contact probe

Contact

Jacketed probe

Jacketed

PCBA Design

PCBA design

Winding probe

Winding

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