2-wire
Both lead resistances and contacts add to the measured element resistance. Calculate their effect over the installation temperature range.
GUILCOR / TEMPERATURE INTELLIGENCE
Pt200
temperature sensors
Choose a 200 Ω platinum sensor for your measurement requirements. Explore its resistance curve, compare tolerance classes against your error budget and match the probe to a Pt200-compatible instrument.
For replacements, send your current sensor and controller references. GUILCOR can help match the complete assembly.
01 / INTERACTIVE OBJECTLoading model…
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Platinum RTD element · Shape, dimensions and materials depend on the selected product.
PtPlatinum sensing element
200 ΩNominal resistance at 0 °C
2 / 3 / 4Common wiring options
02 / MAKE THE RIGHT MATCH
What is a Pt200 sensor?
Choose the tolerance your measurement needs.
Pt200 denotes a platinum RTD with 200 Ω nominal resistance at 0 °C. On the same curve, its resistance is twice that of Pt100 at each temperature. The measuring input must use the correct nominal value; Pt200 is not a drop-in electrical replacement for a Pt100-only input.
For a given excitation current, doubling the nominal resistance doubles the sensor voltage. Whether that improves the installed measurement depends on input range, gain, noise, reference accuracy and self-heating, as well as the sensor tolerance.
01
Instrument
A Pt200-compatible input, the correct resistance curve, supported wiring and controller reference. A Pt100-only input is not interchangeable.
02
Measurement
Operating and peak temperatures, tolerance and response needs.
03
Installation
Dimensions, insertion depth, mounting, cable and connector.
04
Environment
Moisture, vibration, chemicals, pressure and cleaning conditions.
03 / THE ENGINEERING VIEW
Temperature and resistance. One reference tool.
For a Pt200 on the α ≈ 0.00385 °C⁻¹ reference curve, the Callendar–Van Dusen relationship predicts the element's nominal resistance. It describes the reference curve; it does not guarantee the accuracy or temperature rating of a finished probe.
Callendar–Van Dusen equation
At T ≥ 0 °C
R(T) = R₀ (1 + AT + BT²)At T < 0 °C
R(T) = R₀ [1 + AT + BT² + C(T − 100)T³]For an IEC 60751 Pt200 reference: R₀ = 200 Ω, A = 3.9083 × 10⁻³ °C⁻¹, B = −5.775 × 10⁻⁷ °C⁻² and C = −4.183 × 10⁻¹² °C⁻⁴. Verify the selected element's curve in its datasheet.
Calculated resistance
Calculated temperature
Reference domain −200 to +850 °C. Enter element resistance after accounting for leads and contacts.
Nominal reference calculation. Neither calculation range is a product temperature rating.
PT200 / PRACTICAL TOOL
Which tolerance class fits your Pt200 requirement?
Set the temperature and the error budget allocated to the sensing element. Compare Class A and Class B tolerance expressions against that budget at the selected point.
Class A uses ±(0.15 + 0.002|T|) °C; Class B uses ±(0.30 + 0.005|T|) °C. The bars compare each tolerance with your allowance. These expressions also appear as F 0.15 and F 0.3 on thin-film element datasheets.
Treat this as an element-selection check at one temperature. Confirm the selected Pt200 actually carries the specified class over your full operating interval. Reserve additional error budget for the instrument, leads, self-heating and installation.
Tolerance versus your allowance
Dashed line = your element error allowance. Bar length = class tolerance magnitude.
Class A
Class B
ELEMENT TOLERANCE CHECKEnable JavaScript to calculate
A point-by-point tolerance check; confirm the product class and its full valid interval.
04 / CONNECTIONS
Choose the wiring your instrument can read.
Both lead resistance and the instrument’s compensation method affect the result. Match the connection to the required uncertainty and the input terminals.
3-wire
A compatible input compensates for lead resistance when the lead resistances are sufficiently matched. Check the instrument’s method and cable requirements.
4-wire
Separate excitation and voltage-sensing paths greatly reduce the contribution of lead resistance. Use a supported 4-wire input and the correct terminal assignment.
05 / TOLERANCE IS NOT THE WHOLE ERROR
Know what an accuracy class actually covers.
Class A and Class B describe element tolerance on a specified IEC 60751 curve and valid temperature interval. They do not include every contribution from wiring, electronics, self-heating, installation and calibration.
Measuring current warms the element through I²R dissipation. At the same current, a higher resistance dissipates more power. Use the excitation current specified for the selected Pt200 and compare self-heating and response-time data under the stated test conditions.
| Element class | At 0 °C | At 100 °C |
|---|---|---|
| Class A | ±0.15 °C | ±0.35 °C |
| Class B | ±0.30 °C | ±0.80 °C |
Class A: ±(0.15 + 0.002|T|) °C; Class B: ±(0.30 + 0.005|T|) °C. Use only within the selected element’s declared class interval. Thin-film datasheets may use F 0.15 / F 0.3 designations. Fractional labels such as 1/3 B or 1/10 B need their manufacturer’s definition and range.
REFERENCE / RESISTANCE & SPECIFICATION
Pt200 resistance values, ready to check.
| Temperature | Resistance |
|---|---|
| -50 °C | 160.61 Ω |
| 0 °C | 200.00 Ω |
| 20 °C | 215.59 Ω |
| 50 °C | 238.79 Ω |
| 100 °C | 277.01 Ω |
| 200 °C | 351.71 Ω |
| 400 °C | 494.18 Ω |
Full Pt200 resistance table: 0 to 409 °C, in 1 °C steps
Use the row temperature plus the column offset. All resistance values are in ohms. This reference interval does not establish the operating range of a product.
| Row °C | +0 °C | +1 °C | +2 °C | +3 °C | +4 °C | +5 °C | +6 °C | +7 °C | +8 °C | +9 °C |
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 200.00 | 200.78 | 201.56 | 202.34 | 203.12 | 203.91 | 204.69 | 205.47 | 206.25 | 207.03 |
| 10 | 207.81 | 208.58 | 209.36 | 210.14 | 210.92 | 211.70 | 212.48 | 213.25 | 214.03 | 214.81 |
| 20 | 215.59 | 216.36 | 217.14 | 217.92 | 218.69 | 219.47 | 220.25 | 221.02 | 221.80 | 222.57 |
| 30 | 223.35 | 224.12 | 224.89 | 225.67 | 226.44 | 227.22 | 227.99 | 228.76 | 229.54 | 230.31 |
| 40 | 231.08 | 231.85 | 232.63 | 233.40 | 234.17 | 234.94 | 235.71 | 236.48 | 237.25 | 238.02 |
| 50 | 238.79 | 239.56 | 240.33 | 241.10 | 241.87 | 242.64 | 243.41 | 244.18 | 244.95 | 245.72 |
| 60 | 246.48 | 247.25 | 248.02 | 248.79 | 249.55 | 250.32 | 251.09 | 251.85 | 252.62 | 253.38 |
| 70 | 254.15 | 254.92 | 255.68 | 256.45 | 257.21 | 257.97 | 258.74 | 259.50 | 260.27 | 261.03 |
| 80 | 261.79 | 262.56 | 263.32 | 264.08 | 264.84 | 265.61 | 266.37 | 267.13 | 267.89 | 268.65 |
| 90 | 269.41 | 270.17 | 270.94 | 271.70 | 272.46 | 273.22 | 273.97 | 274.73 | 275.49 | 276.25 |
| 100 | 277.01 | 277.77 | 278.53 | 279.29 | 280.04 | 280.80 | 281.56 | 282.32 | 283.07 | 283.83 |
| 110 | 284.59 | 285.34 | 286.10 | 286.85 | 287.61 | 288.36 | 289.12 | 289.87 | 290.63 | 291.38 |
| 120 | 292.14 | 292.89 | 293.64 | 294.40 | 295.15 | 295.90 | 296.66 | 297.41 | 298.16 | 298.91 |
| 130 | 299.66 | 300.42 | 301.17 | 301.92 | 302.67 | 303.42 | 304.17 | 304.92 | 305.67 | 306.42 |
| 140 | 307.17 | 307.92 | 308.67 | 309.42 | 310.16 | 310.91 | 311.66 | 312.41 | 313.16 | 313.90 |
| 150 | 314.65 | 315.40 | 316.14 | 316.89 | 317.64 | 318.38 | 319.13 | 319.87 | 320.62 | 321.36 |
| 160 | 322.11 | 322.85 | 323.60 | 324.34 | 325.09 | 325.83 | 326.57 | 327.32 | 328.06 | 328.80 |
| 170 | 329.54 | 330.29 | 331.03 | 331.77 | 332.51 | 333.25 | 333.99 | 334.74 | 335.48 | 336.22 |
| 180 | 336.96 | 337.70 | 338.44 | 339.18 | 339.92 | 340.65 | 341.39 | 342.13 | 342.87 | 343.61 |
| 190 | 344.35 | 345.08 | 345.82 | 346.56 | 347.30 | 348.03 | 348.77 | 349.50 | 350.24 | 350.98 |
| 200 | 351.71 | 352.45 | 353.18 | 353.92 | 354.65 | 355.39 | 356.12 | 356.85 | 357.59 | 358.32 |
| 210 | 359.06 | 359.79 | 360.52 | 361.25 | 361.99 | 362.72 | 363.45 | 364.18 | 364.91 | 365.64 |
| 220 | 366.38 | 367.11 | 367.84 | 368.57 | 369.30 | 370.03 | 370.76 | 371.49 | 372.21 | 372.94 |
| 230 | 373.67 | 374.40 | 375.13 | 375.86 | 376.58 | 377.31 | 378.04 | 378.77 | 379.49 | 380.22 |
| 240 | 380.95 | 381.67 | 382.40 | 383.12 | 383.85 | 384.57 | 385.30 | 386.02 | 386.75 | 387.47 |
| 250 | 388.20 | 388.92 | 389.64 | 390.37 | 391.09 | 391.81 | 392.54 | 393.26 | 393.98 | 394.70 |
| 260 | 395.42 | 396.15 | 396.87 | 397.59 | 398.31 | 399.03 | 399.75 | 400.47 | 401.19 | 401.91 |
| 270 | 402.63 | 403.35 | 404.07 | 404.79 | 405.50 | 406.22 | 406.94 | 407.66 | 408.38 | 409.09 |
| 280 | 409.81 | 410.53 | 411.24 | 411.96 | 412.68 | 413.39 | 414.11 | 414.82 | 415.54 | 416.25 |
| 290 | 416.97 | 417.68 | 418.40 | 419.11 | 419.82 | 420.54 | 421.25 | 421.96 | 422.68 | 423.39 |
| 300 | 424.10 | 424.82 | 425.53 | 426.24 | 426.95 | 427.66 | 428.37 | 429.08 | 429.79 | 430.50 |
| 310 | 431.22 | 431.92 | 432.63 | 433.34 | 434.05 | 434.76 | 435.47 | 436.18 | 436.89 | 437.60 |
| 320 | 438.30 | 439.01 | 439.72 | 440.43 | 441.13 | 441.84 | 442.55 | 443.25 | 443.96 | 444.66 |
| 330 | 445.37 | 446.08 | 446.78 | 447.49 | 448.19 | 448.89 | 449.60 | 450.30 | 451.01 | 451.71 |
| 340 | 452.41 | 453.12 | 453.82 | 454.52 | 455.22 | 455.93 | 456.63 | 457.33 | 458.03 | 458.73 |
| 350 | 459.43 | 460.13 | 460.83 | 461.53 | 462.23 | 462.93 | 463.63 | 464.33 | 465.03 | 465.73 |
| 360 | 466.43 | 467.13 | 467.83 | 468.52 | 469.22 | 469.92 | 470.62 | 471.31 | 472.01 | 472.71 |
| 370 | 473.40 | 474.10 | 474.79 | 475.49 | 476.19 | 476.88 | 477.58 | 478.27 | 478.96 | 479.66 |
| 380 | 480.35 | 481.05 | 481.74 | 482.43 | 483.13 | 483.82 | 484.51 | 485.20 | 485.90 | 486.59 |
| 390 | 487.28 | 487.97 | 488.66 | 489.35 | 490.04 | 490.73 | 491.43 | 492.12 | 492.81 | 493.49 |
| 400 | 494.18 | 494.87 | 495.56 | 496.25 | 496.94 | 497.63 | 498.32 | 499.00 | 499.69 | 500.38 |
Worked example: at 100 °C, R = 200 × [1 + (3.9083 × 10⁻³ × 100) − (5.775 × 10⁻⁷ × 100²)] = 277.01100 Ω. Inverting that exact nominal value returns 100 °C. Rounded table values and real sensor tolerances affect the inverse result.
What the specification must define
The Pt designation specifies platinum and nominal resistance. Confirm thin-film or wire-wound construction, curve, class and its valid interval, operating and peak temperatures, measuring current, self-heating, response-time test medium, long-term stability, sheath material, cable insulation and environmental protection. These properties cannot be inferred from nominal resistance alone.
Technical references: Texas Instruments — A Basic Guide to RTD Measurements; WIKA — IEC 60751 tolerance designations; UST — platinum reference coefficients and resistance values. Match these nominal relationships to the selected element’s datasheet.
ELECTRONICS / COMPLETE THE MEASUREMENT
From a passive element to a temperature reading.
At an illustrative 0.3 mA, nominal Pt200 voltages are 60.00 mV at 0 °C and 83.10 mV at 100 °C. Verify gain, supply headroom and input common-mode limits over the full operating interval; the probe does not generate a conditioned industrial voltage output by itself.
Excitation→Pt200 + wiring→Signal conditioning & ADC→Curve conversion
For a 4–20 mA, 0–5 V or 0–10 V output, specify an appropriate transmitter. Check excitation, reference, gain, input common-mode range and calibration over the full measurement interval.
07 / WHERE IT WORKS
A different assembly for each environment.
These applications are selection contexts. Confirm Pt200 input support and the complete probe specification for your installation.
01Industrial instrumentation
Confirm an explicit Pt200 input and an appropriate uncertainty budget for the process.
02Test & calibration benches
Compare readings using a documented resistance curve, calibrated instruments and suitable thermal conditions.
03Embedded & remote measurements
Review input headroom, lead effects and mechanical protection for the actual environment.
08 / FORM FACTOR LIBRARY
Choose your Pt200 probe format
The Pt200 can take many forms. These are GUILCOR probe families and a design service, not a promise that every format has a Pt200 option. Confirm the construction for the selected reference.
SELECTION / YOUR APPLICATION
Is Pt200 the right starting point?
Match the reference to the application.
Your equipment specifies Pt200. Review the required tolerance interval and total measurement error alongside the nominal resistance.
Review the specification →Review Pt500 alongside Pt200.
Compare the nominal resistance, material, reference curve and supported wiring. A shared RTD label does not make two references compatible with the same input.
Explore Pt500 →Keep the complete specification together.
Keep the existing sensor and instrument references. Check the specified curve, tolerance interval, wire count and complete probe dimensions before choosing a replacement.
Prepare your enquiry →These links support a specification review. They do not establish interchangeable parts or availability of a complete assembly.
More selection details
A 200 Ω element gives twice the resistance change per degree of Pt100 on the same curve. With the same lead resistance, its relative lead contribution is smaller.
Input support must be explicit. The higher signal does not automatically improve immunity to electrical interference, reduce thermal error or preserve the calibration of a Pt100 system.
Compare the instrument, curve and complete assembly before changing nominal resistance. A higher R₀ alone does not provide a tighter tolerance.
10 / PRACTICAL ANSWERS
Practical questions about Pt200.
Can Pt200 replace Pt100 without recalibration?
No such general substitution is valid. The input must support Pt200 and the correct curve, and the completed measurement chain should be checked after replacement.
Why does a two-wire resistance reading give a higher temperature?
Both leads and any contact resistance add to the element resistance. On the increasing platinum curve, extra resistance is interpreted as a higher temperature unless the instrument compensates for it.
Does every Pt200 cover the same temperature range?
No. The element, sheath, seals, cable and connector all constrain the complete probe. Use the selected reference’s rating, not the calculation domain.
What determines response time and long-term stability?
Construction, thermal contact, surrounding medium, exposure and operating history matter. Request response-time conditions and drift or stability data for the actual reference.
What should I send for a quotation or replacement?
Send the sensor and controller references, required range and uncertainty, wiring, dimensions, mounting, environment and quantity. Include a drawing or photo if available.
What does the 3D model show?
It illustrates a platinum RTD element. It is not a dimensional model of a selected Pt200 product or a guarantee of its construction.
GUILCOR / YOUR ENQUIRY
Define your Pt200 enquiry.
Send the electrical reference and the installed probe requirements together. Include the instrument configuration so the sensing element and readout can be reviewed as one measurement chain.
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 instrument
Sensor material, nominal resistance and reference temperature, curve, tolerance class and interval, instrument model and 2-, 3- or 4-wire input.
02
Measurement conditions
Operating and peak temperatures, required system accuracy, response target, measured medium and calibration points.
03
Assembly and connection
Sheath dimensions, insertion and mounting, cable length and insulation, wire count, termination and environmental exposure.
04
Project and validation
Sample and production quantities, target delivery, calibration or documentation needs, and the checks required before approval.