Match the reference to the application.
The circuit specifies the matching 2 kΩ NTC characteristic. Check excitation and thermal conditions when defining the complete measurement.
Review the specification →GUILCOR · NTC thermistors
2 kΩ NTC
Choose excitation from the allowed temperature rise.
Specify a 2 kΩ NTC together with its excitation conditions. Estimate a measuring-current ceiling from a stated thermal budget and dissipation factor.
Loading 3D model…
Understand the reference
What defines a 2 kΩ NTC?
2 kΩNominal resistance at 25 °C
NegativeResistance decreases as temperature rises
Curve + packageBoth must match the application
A 2 kΩ label identifies the nominal resistance at 25 °C. It does not prescribe a universal maximum measuring current. The same electrical power can produce different temperature rises in still air, flowing liquid or a bonded surface probe.
A 2 kΩ NTC is a negative temperature coefficient thermistor with a nominal resistance of 2,000 Ω at 25 °C (R25). The value is a reference point, not a fixed resistance during use. Select the resistance–temperature characteristic together with tolerance, excitation and the completed probe construction.
SELECTION / YOUR APPLICATION
Is 2 kΩ NTC the right starting point?
Review 3 kΩ NTC alongside 2 kΩ NTC.
Compare the nominal resistance, reference temperature and full R/T characteristic. Matching at one temperature does not establish a compatible replacement over the operating interval.
Explore 3 kΩ NTC →Keep the complete specification together.
Keep the controller reference and the specified NTC curve together. Check tolerances, cable and probe construction rather than selecting by resistance or connector alone.
Prepare your enquiry →These links support a specification review. They do not establish interchangeable parts or availability of a complete assembly.
Application check
Translate a self-heating budget into measuring current.
Tool input range: -20 to 100
Tool input range: 1000 to 6000
Tool input range: 0.01 to 100
Tool input range: 0.001 to 2
Enter an illustrative dissipation factor and an allowed temperature rise. The calculator estimates the current that would use this self-heating budget at the selected resistance.
Element resistance
Power budget
Estimated current ceiling
Voltage across sensor
Enable JavaScript to calculate.
Use a dissipation factor from the selected part under comparable mounting and medium conditions. The result is a first-order thermal budget, not a rated-current limit or a complete thermal simulation.
Model equationPbudget = δ × ΔTallowed; Ibudget = √(Pbudget / R)
Use the smaller of the thermal-budget current and the datasheet’s electrical limit. Allow margin for curve tolerance and the temperature dependence of resistance.
Operating principle
Read the characteristic, not just R25.
Illustrative resistance values
| Temperature | Resistance |
|---|---|
| -20 °C | 21,076.94 Ω |
| 0 °C | 6,724.12 Ω |
| 25 °C | 2,000.00 Ω |
| 50 °C | 717.64 Ω |
| 85 °C | 217.33 Ω |
| 100 °C | 139.50 Ω |
From resistance to temperature
The constant-β approximation uses R(T) = R25 × exp[β(1/T − 1/298.15)], with absolute temperature in kelvin. It is useful for comparing circuit assumptions; a real part may need its specified R/T table or Steinhart–Hart coefficients for the required interval.
For Steinhart–Hart, 1/T = A + B ln(R) + C[ln(R)]³. Use coefficients and resistance units supplied for the selected part. A coefficient labelled B here is not automatically the same as a thermistor’s β value.
The temperatures in this example are calculation points, not an operating-temperature rating. Confirm the element, cable, seals and assembled probe limits.
A small electrical signal may need more gain or a better input circuit. Raising current to improve that signal changes the thermal error and should be evaluated explicitly.
Selection checklist
Specify the complete sensing assembly.
Electrical and thermal requirements
- R25 tolerance and the exact R/T curve, β interval or coefficients.
- Required temperature interval and complete measurement error budget.
- Measuring current, allowable dissipation and self-heating under the actual mounting conditions.
- Response time with its stated medium, flow and test method; no universal response time follows from R25.
- Ageing, drift and environmental qualification documented for the selected part.
Mechanical and installation requirements
- Element or assembled probe dimensions, sheath and contact arrangement.
- Cable length, insulation, connector and total two-wire loop resistance.
- Sealing, media compatibility, pressure and ingress requirements where applicable.
- Controller curve support, supply, input range, loading and acquisition timing.
- Calibration points and required documentation for the final assembly.
Wiring and measurement
Connect the sensor and account for the circuit.
Example two-wire divider
Supply → fixed pull-up Rs → measurement node
Measurement node → NTC → ground
ADC measures the node relative to ground
For an unloaded input, Vout = Vs × RNTC / (Rs + RNTC). In this arrangement, warming an NTC lowers the output voltage. The element has no polarity, although an assembled cable or connector can have a specified pin assignment.
Separate electrical and thermal errors
Lead resistance, leakage, finite input impedance and sampling transients can alter the measured signal. Measuring current also dissipates power in the element: P = I²R. The approximate steady-state self-heating rise is P/δ when the dissipation factor δ applies to the actual installation.
A robust coating or sheath can improve environmental protection while changing heat transfer. Validate the completed probe in its intended medium instead of carrying over the bare element’s response figure.
Application contexts
Where to evaluate a 2 kΩ NTC.
Embedded temperature control
Coordinate excitation with the ADC range and required resolution.
Immersion measurement
Use thermal data appropriate to the completed probe and liquid conditions.
Surface monitoring
Account for the bond, contact area and heat flow through the leads.
Application examples are selection contexts. Suitability and any required certification depend on the identified reference and completed assembly.
Probe construction
Choose the installation format.
Match the sensing point, medium and mounting to the probe construction. These links explore construction families; confirm the required NTC characteristic when requesting a reference.
Frequently asked questions
2 kΩ NTC questions.
Is a 0.5 mA measuring current always acceptable?
No. Current limits depend on the selected part and mounting. At 2 kΩ, 0.5 mA dissipates 0.5 mW; the resulting temperature rise still needs the applicable dissipation factor.
Is every 2 kΩ NTC interchangeable?
No. Match R25, the complete curve and tolerances, then verify electrical excitation, construction, cable, environmental limits and controller configuration.
Can the example values replace a product datasheet?
No. The table and tool illustrate stated assumptions. Use the selected reference’s data, curve and test conditions for specification and validation.
What information should I send for a probe request?
Include the required R25 and curve, temperature range, allowable error, medium, mounting, dimensions, cable and connector, controller input and expected quantity.
Technical background: Manufacturer guidance on sensing and readout. Example calculations are educational models with the assumptions stated above.
GUILCOR / YOUR ENQUIRY
Define your 2 kΩ NTC enquiry.
Send the electrical reference and the installation details together. A nominal resistance alone does not define the right replacement or assembled probe.
Missing a reference or datasheet?
Send the component marking, equipment reference and any photographs or documents you have. These provide a starting point for identifying what must be confirmed.
The outline helps prepare your enquiry. Copying it does not send a request.
FOUR DETAILS THAT MOVE THE DISCUSSION FORWARD
01
Sensor and controller
Part number, nominal resistance and reference temperature, R/T data or specified β interval, tolerance and controller input.
02
Measurement conditions
Operating and peak temperatures, required accuracy and response target, measured medium and exposure to moisture or cleaning.
03
Assembly and connection
Probe dimensions, mounting or insertion, cable length and insulation, connector or lead termination. Attach a drawing or photo.
04
Project and validation
Sample and production quantities, target delivery, calibration or documentation needs, and the checks required before approval.