KTY83-110 | GUILCOR SENSORS

KTY83-110
Temperature sensors

Compact PTC temperature sensor ideal for embedded systems and industrial equipment monitoring, with excellent linearity.

Maximum precision
+/- 2,0°K

Minimum temperature
-55°C

Maximum temperature
+300°C

Minimum dimensions
1,8 x 2 x 4

Response time
Fast

Self-heating
Low

Price
Medium

Drift
Low

What is a KTY83-110 sensor ?

The KTY83-110 is a high-temperature silicon PTC sensor designed for demanding environments up to +300 °C.

It is an improved version of the KTY81-110, offering enhanced thermal stability, better mechanical resistance, and a more consistent R/T curve at high temperatures.

It is found in power converters, electric motors, transformer windings, and high-performance automotive systems.

Operating principle

Like all silicon PTCs, the resistance of the KTY83-110 increases with temperature according to a quadratic law:

R(T) = R25 x [1 + A(T - 25) + B(T - 25)²]

with :

R25 = 1000 Ω
A = 7,874 × 10⁻³
B = 1,874 × 10⁻⁵

(Valid from -55°C to +300°C)

The doped silicon used in the KTY83 series exhibits superior stability against oxidation and reduced drift, even after thousands of thermal cycles.

Technical specifications

Parameter	Typical Value
Nominal resistance at 25 °C	1000 Ω
Temperature coefficient (at 25 °C)	≈ 8 Ω/°C at 25°C
Recommended maximum tension	5 V
Typical measurement current	1 mA
Operating temperature	−55 °C → +300 °C
Standard deviation at 100°C	±1,5 %
Case material	Hermetic axial glass
Typical response time	1 to 2 s

Wiring configuration

Type	Description	Precision
2-wire	Simple connection.	✅ Standard
3-wire	Compensate for the resistance of the cable.	🏆 Industrial
Integrated	Stuck in the engine housing or on the heatsink.	💡 Direct thermoprotection

Self-heating

At 1 mA, the dissipation remains below 2 mW, resulting in an internal heating of < 0.1 °C, even at high temperatures.

Application areas

⚙️ Thermal surveillance of electric motors, IGBTs, and MOSFETs

🧱 High-temperature industrial systems (up to 300 °C)

🚗 Automotive applications under the hood

🔋 Thermal protection in converters and fast chargers

💡 Instrumentation and thermal test benches

Should I choose a KTY83-110 sensor ?

Strengths points

🔥 Exceptional temperature maintenance
→ The KTY83-110 remains stable up to +300 °C, making it one of the most durable silicon PTCs on the market.
⚙️ Ideal for harsh environments
→ Thanks to its hermetic glass casing, it withstands thermal shocks, vibrations, and oily or humid environments.
🧠 Very regular R/T curve
→ Its extended linearity simplifies integration into analog circuits or converters without complex correction.

Weaknesses points

🌡️ Limited measurement range
→ A current that is too strong (> 2 mA) causes significant self-heating, which should be avoided in precision applications.
💰 Slightly higher cost

→ Its high-temperature design and sorting in production make the KTY83-110 a bit more expensive than the KTY81 models.

📐 Calibration necessary at high T°
→ Beyond 200 °C, a spot recalibration may be required to maintain accuracy ±1 %.

Useful information

Here is some useful information regarding the KTY83-110 sensors.

Tolerances and precision classes

The KTY83 sensors offer excellent thermal and mechanical stability, even at high temperatures. They are sorted into several classes based on the accuracy of the resistance at 25 °C and the drift over the full range.

Class	Tolerance at 25 °C	Max. gap on the range	Operating range	Remarks
A (enhanced precision)	±0,5 % (±5 Ω)	±1 °C	−40 °C → +200 °C	Production release version
B (standard)	±1 % (±10 Ω)	±2 °C	−55 °C → +300 °C	Most common value (KTY83-110)
C (extent)	±2 % (±20 Ω)	±4 °C	−55 °C → +300 °C	Wide tolerance for economic applications

🔹 Note:

Even the standard class (B) ensures excellent accuracy and long-term stability better than 0.1% per year, even after 1000 thermal cycles.

Application example – Simplified equation

The quadratic equation of the KTY83-110 allows for the resistance to be obtained as a function of temperature:

R(T) = R25 x [1 + A(T - 25) + B(T - 25)²]

with :

R25 = 1000 Ω
A = 7,874 × 10⁻³
B = 1,874 × 10⁻⁵

🔹 Example 1: calculation of resistance at 200 °C

R(200) = 1000 × [1 + 7,784×10⁻³(200-25) + 1,874×10⁻⁵(200-25)²]

R(200) = 1000 × [1 + 1,378 × (200-25) + 1,874×10⁻⁵ × (200-25)²]

R(200) = 1000 × [1 + 1,378 + 0,574] = 1000 × 2,952 = 2952 Ω

✅ Result: at 200 °C, the resistance of the KTY83-110 is approximately 2952 Ω.

🔹 Example 2: calculating the temperature from a measured resistance

We measure R=1900ΩR = 1900 ΩR=1900Ω.

What is the corresponding temperature?

T = 25 + [-A + √(A² - 4B(1 - R/R₂₅))] / (2B)

T = 25 + -7,874×10⁻³ + √((7,874×10⁻³)² - 4×1,874×10⁻⁵×(1-1,9)) / (2×1,874×10⁻⁵)

T ≈ 145°C

✅ Result: the corresponding temperature is approximately 145 °C.

🔹 Practical notes

The simplified equation is sufficient for most engine control calculations.
For temperatures > 250 °C, a calibration table can refine accuracy.
The R/T curve is very stable and repeatable from one component to another.

Integration diagram in an electronic system

The KTY83-110 is designed for direct use in a divider bridge or a differential amplifier.

Its high nominal resistance allows for the use of low current circuits without specific amplification.

🔹 Typical components

Component	Function
KTY83-110 (PTC silicon)	High temperature sensitive element
Rref ≈ 1 kΩ	Reference resistance for the voltage divider
5 V DC Power Supply	Source stable
ADC (12–16 bits)	Convert the voltage to a digital signal
Microcontroller (STM32, ESP32, Arduino)	Calculate T = f(R)
RC Filtering (1 kΩ / 100 nF)	Stabilize the signal against industrial noise