Match the reference to the application.
The readout is designed for the required 470 kΩ NTC curve. Review source impedance, bandwidth and input noise with the sensing assembly.
Review the specification →GUILCOR · NTC thermistors
470 kΩ NTC
Evaluate bandwidth and input noise together.
A 470 kΩ NTC input needs a realistic noise budget. Compare resistor thermal noise with an illustrative electronics-noise contribution.
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Understand the reference
What defines a 470 kΩ NTC?
470 kΩNominal resistance at 25 °C
NegativeResistance decreases as temperature rises
Curve + packageBoth must match the application
Large resistance values can reduce intended excitation current while increasing source impedance. The input bandwidth and electronics noise influence how much temperature variation can be resolved.
A 470 kΩ NTC is a negative temperature coefficient thermistor with a nominal resistance of 470,000 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 470 kΩ NTC the right starting point?
Review 1 MΩ NTC alongside 470 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 1 MΩ 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
Express input noise as temperature noise.
Tool input range: -20 to 100
Tool input range: 0.1 to 100000
Tool input range: 0 to 10000
Estimate thermal noise from the divider’s equivalent resistance over an ideal rectangular noise bandwidth, then combine it with an independent RMS voltage-noise input.
Equivalent source resistance
Resistor thermal noise
Combined RMS voltage noise
Equivalent RMS temperature noise
Enable JavaScript to calculate.
Both resistors are assumed to be at the selected temperature. This simplified RMS estimate excludes excess thermistor noise, 1/f noise, interference, bias-current noise, ADC quantisation and thermal drift. It is not a complete instrument noise specification.
Model equationen = √(4kB T Rth BW); etotal = √(en² + einput²); σT ≈ etotal / |dVout/dT|
Use the actual filter’s equivalent noise bandwidth and measured or specified input noise. A narrower bandwidth can reduce noise while slowing the electrical response.
Operating principle
Read the characteristic, not just R25.
Illustrative resistance values
| Temperature | Resistance |
|---|---|
| -20 °C | 4,953,080.44 Ω |
| 0 °C | 1,580,168.37 Ω |
| 25 °C | 470,000.00 Ω |
| 50 °C | 168,644.58 Ω |
| 85 °C | 51,073.53 Ω |
| 100 °C | 32,783.43 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 quiet reading is not necessarily accurate: systematic curve error, calibration offset and poor thermal coupling may remain even when short-term noise is small.
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 470 kΩ NTC.
Wireless environmental sensors
Coordinate bandwidth with the update rate and expected temperature changes.
Laboratory acquisition
Separate repeatability from absolute calibration uncertainty.
Portable instrumentation
Check the input stage and wiring under the intended interference conditions.
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
470 kΩ NTC questions.
Does averaging remove every temperature error?
No. Averaging may reduce suitable random noise, but it does not remove a systematic calibration error, wrong curve or steady self-heating bias.
Is every 470 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 470 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.