PT1000 RTD Table: Resistance Chart,Calculator & Class A/B Tolerance

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PT1000 RTD Table: Resistance Chart, Calculator & Class A/B Tolerance

Jun 05, 2026

Direct Answer

A PT1000 RTD measures 1000.0 ohms at 0 C, about 1385.1 ohms at 100 C, and about 3137.1 ohms at 600 C on the IEC 60751 alpha 0.003851 curve. Use the quick table below for common engineering points, or download the full 1 C-step PT1000 resistance chart from -50 to +600 C.

Publisher note: Place the interactive calculator and CSV/PDF download controls directly below this answer block. This is the click-winning section for pt1000 rtd table and pt1000 table.

Quick PT1000 Resistance Lookup

Temperature (C)	Resistance (ohms)	Class A tolerance (+/- C)	Class A tolerance (+/- ohms)	Class B tolerance (+/- C)	Class B tolerance (+/- ohms)
-50	803.1	0.25	0.99	0.55	2.18
-40	842.7	0.23	0.91	0.50	1.98
-20	921.6	0.19	0.75	0.40	1.57
0	1000.0	0.15	0.59	0.30	1.17
20	1077.9	0.19	0.74	0.40	1.55
25	1097.3	0.20	0.78	0.43	1.65
50	1194.0	0.25	0.96	0.55	2.12
100	1385.1	0.35	1.33	0.80	3.03
126	1483.3	0.40	1.51	0.93	3.50
150	1573.3	0.45	1.68	1.05	3.92
200	1758.6	0.55	2.02	1.30	4.78
250	1941.0	0.65	2.35	1.55	5.61
300	2120.5	0.75	2.67	1.80	6.41
350	2297.2	0.85	2.98	2.05	7.18
400	2470.9	0.95	3.27	2.30	7.93
450	2641.8	1.05	3.56	2.55	8.64
500	2809.8	--	--	2.80	9.33
550	2974.9	--	--	3.05	9.98
600	3137.1	--	--	3.30	10.61

Download the complete 1 C-step table: data/pt1000-table.csv or data/pt1000-table.pdf.
Embed the bidirectional calculator module: modules/pt1000-calculator.html.

What Is a PT1000 RTD?

A PT1000 is a platinum resistance temperature detector with a nominal resistance of 1000 ohms at 0 C. It uses the same IEC 60751 platinum curve as a PT100, but its resistance is ten times higher. That gives a PT1000 about 3.85 ohms/C sensitivity near 0 C, compared with about 0.385 ohms/C for a PT100.

For engineers, the practical benefit is lower lead-wire error in simple 2-wire circuits. For OEM buyers, the benefit is a stable, standards-based sensor element that can be built into stainless probes, threaded housings, cable assemblies and custom temperature sensor designs. See the Focusens RTD temperature sensor range for probe options.

IEC 60751 PT1000 Formula

For temperatures at or above 0 C:

text

R(t) = R0 x [1 + A x t + B x t^2]

For temperatures below 0 C:

R(t) = R0 x [1 + A x t + B x t^2 + C x (t - 100) x t^3]

Where:

Parameter	Value
R0	1000 ohms
A	3.9083 x 10^-3 C^-1
B	-5.775 x 10^-7 C^-2
C	-4.183 x 10^-12 C^-4
Alpha	0.003851, also written as 3850 ppm/K

These coefficients are for the common IEC 60751 / DIN EN 60751 industrial platinum RTD curve. If your system uses an older alpha 0.003920 curve, do not mix the tables; confirm the transmitter and sensor standard before calibration.

Class A vs Class B PT1000 Tolerance

IEC 60751 tolerance classes define the allowed temperature error of the RTD element. PT1000 and PT100 use the same temperature tolerance classes; the ohm error is larger for PT1000 only because the nominal resistance is ten times higher.

Item	Class A	Class B
Temperature tolerance formula	+/-(0.15 + 0.002 x abs(t)) C	+/-(0.30 + 0.005 x abs(t)) C
Error at 0 C	+/-0.15 C	+/-0.30 C
Error at 100 C	+/-0.35 C	+/-0.80 C
Common element range	-100 to +450 C	-196 to +600 C
Typical use	Precision HVAC, laboratory, medical, process control	General HVAC, industrial equipment, OEM probes

Class A is not normally applied above +450 C. That is why the quick table leaves the Class A ohm tolerance blank at 500 C, 550 C and 600 C.

How to Convert Resistance to Temperature

For quick checks, use the lookup table and interpolate between nearby points. For example, 1097.3 ohms is about 25 C, and 1483.3 ohms is about 126 C.

For production calibration, use the IEC 60751 equation in the sensor transmitter, PLC, firmware or data logger. When calculating temperature from resistance, solve the equation numerically or use a validated conversion library rather than assuming the curve is perfectly linear across the whole range. The included calculator module supports temperature-to-resistance and resistance-to-temperature lookup across -50 to +600 C.

2-Wire Lead Resistance Error

In a 2-wire RTD circuit, the measured resistance includes sensor resistance plus both lead wires. A PT1000 reduces this error compared with a PT100, but it does not remove it.

Example:

Measured circuit resistance = PT1000 element resistance + lead resistance If the two wires add 1.0 ohm, the reading shifts by about 0.26 C near 0 C.

For long cables or tight accuracy requirements, use 3-wire or 4-wire RTD wiring. For selection guidance, link this page to the RTD wiring guide and the PT100 vs PT1000 comparison.

Focusens PT1000 RTD Probe Options

Focusens can build PT1000 RTD elements into custom probes for coffee machines, industrial temperature measurement, HVAC systems, energy equipment and appliance assemblies. For a product-style entry point, link to the Focusens high reliable PT100/PT1000 RTD temperature sensor. Typical customization points include:

Custom point	Options to confirm
Sensing element	PT1000, PT100, Class A or Class B
Housing	Stainless probe, threaded probe, flange, ring terminal or custom metal shell
Cable	PVC, silicone, PTFE, fiberglass or high-temperature cable
Connector	Bare lead, JST, Molex, aviation connector or customer-specified connector
Calibration	IEC 60751 curve, customer test point, batch report if required

CTA: Need a PT1000 probe, cable assembly or private-label temperature sensor? Send your drawing, target temperature range, cable length and connector requirement to Focusens for a custom RTD sensor quotation.

FAQ

What is the resistance of a PT1000 at 100 C?

A PT1000 RTD is about 1385.1 ohms at 100 C on the IEC 60751 alpha 0.003851 curve.

What is the resistance of a PT1000 at 25 C?

A PT1000 RTD is about 1097.3 ohms at 25 C.

What is the resistance of a PT1000 at 126 C?

A PT1000 RTD is about 1483.3 ohms at 126 C. This is a useful example point because it often appears in lookup-table searches.

Is PT1000 more accurate than PT100?

Not by tolerance class alone. PT1000 and PT100 can both be Class A or Class B. PT1000 often performs better in 2-wire circuits because the same lead resistance creates a smaller temperature error.

What is the difference between PT1000 and PT100?

PT100 is 100 ohms at 0 C; PT1000 is 1000 ohms at 0 C. Their IEC 60751 curve shape and tolerance classes are the same, but PT1000 has ten times the resistance and about ten times the ohms-per-degree sensitivity.

What standard defines the PT1000 resistance table?

The common industrial PT1000 table is defined by IEC 60751 / DIN EN 60751 for platinum resistance thermometers.

Can I use this table for every PT1000?

Use it for IEC 60751 alpha 0.003851 PT1000 sensors. Do not use it for non-standard platinum curves, damaged elements, transmitter-scaled outputs or sensors with significant lead-wire resistance that has not been compensated.

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