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RTD Tolerance Class Table (IEC 60751)

RTD tolerance table for platinum resistance thermometers, with the limit for each IEC 60751 class at common temperatures in °C and in ohms for a Pt100.

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Tolerance classes

Class	Formula (°C)	Wire wound range	Film range
AA	± (0.10 + 0.0017 \|t\|)	−50 to 250 °C	0 to 150 °C
A	± (0.15 + 0.002 \|t\|)	−100 to 450 °C	−30 to 300 °C
B	± (0.30 + 0.005 \|t\|)	−196 to 600 °C	−50 to 500 °C
C	± (0.60 + 0.01 \|t\|)	−196 to 600 °C	−50 to 600 °C

Tolerance at common temperatures (Pt100)

°C	AA ± °C	A ± °C	B ± °C	C ± °C	A ± Ω	B ± Ω
−196			1.28	2.56		0.552
−100		0.35	0.80	1.60	0.142	0.324
−50	0.18	0.25	0.55	1.10	0.099	0.218
0	0.10	0.15	0.30	0.60	0.059	0.117
50	0.18	0.25	0.55	1.10	0.096	0.212
100	0.27	0.35	0.80	1.60	0.133	0.303
150	0.35	0.45	1.05	2.10	0.168	0.392
200	0.44	0.55	1.30	2.60	0.202	0.478
250	0.53	0.65	1.55	3.10	0.235	0.561
300		0.75	1.80	3.60	0.267	0.641
350		0.85	2.05	4.10	0.298	0.718
400		0.95	2.30	4.60	0.327	0.793
450		1.05	2.55	5.10	0.356	0.864
500			2.80	5.60		0.933
600			3.30	6.60		1.061

About this Table

RTD tolerance table for platinum resistance thermometers, with the limit for each IEC 60751 class at common temperatures in °C and in ohms for a Pt100.

Basis: IEC 60751:2008 wire wound element tolerance classes: AA ± (0.1 + 0.0017 |t|), A ± (0.15 + 0.002 |t|), B ± (0.3 + 0.005 |t|), C ± (0.6 + 0.01 |t|) °C, each valid over its stated range.

How to use

Find the sensor class on its datasheet or tag (A and B are the most common).
Read the ± °C limit at your temperature, or use the formula for other temperatures.
For a Pt1000 multiply the Ω values by 10.

Notes

Values outside a class range are left blank: the class is not defined there.
Limits shown are for wire wound elements; film elements have narrower ranges (see the first table).

Frequently Asked Questions

What is the tolerance of a class A Pt100 at 100 °C?

± 0.35 °C, which is about ± 0.13 Ω.

What does 1/3 DIN mean?

It is a common trade name for class AA, one third of the class B tolerance at 0 °C.

Are film sensors different?

Yes, film elements have narrower valid ranges for each class.

Learn more on the blog

What is an RTD and how it works

A practical guide on instrumentationblog.in that explains the engineering behind this table.

Read Full Article

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