PT100 / PT1000 Resistance Table and °C ↔ Ω Calculator

Q: What is the PT100 resistance-temperature formula?

IEC 60751 uses the Callendar–Van Dusen equation for platinum resistance thermometers. At 0 °C and above, R(t) = R0·(1 + A·t + B·t²) with A = 3.9083×10⁻³ °C⁻¹ and B = −5.775×10⁻⁷ °C⁻². Below 0 °C the term C·(t − 100)·t³ is added, with C = −4.183×10⁻¹² °C⁻⁴. R0 is 100 Ω for Pt100 and 1000 Ω for Pt1000. The table and calculator on this page are generated from this equation.

Q: What is the resistance of a PT100 at 100 °C and a PT1000 at 0 °C?

Per IEC 60751, a Pt100 reads 100.00 Ω at 0 °C and 138.51 Ω at 100 °C. A Pt1000 reads 1000.0 Ω at 0 °C and 1385.1 Ω at 100 °C. At -100 °C a Pt100 is about 60.26 Ω and a Pt1000 about 602.6 Ω. Every value from -200 to +850 °C is listed in 1 °C steps in the full table on this page.

Q: What is the difference between PT100 and PT1000?

Both are platinum sensors of the same standard; the difference is the nominal resistance at 0 °C (100 Ω versus 1000 Ω). A Pt1000 is ten times more sensitive (about 3.9 Ω/°C), so the same lead resistance causes a temperature error ten times smaller. The input of the instrument the sensor connects to decides which one you use; follow the sensor type stated in that instrument's manual.

Q: What is the difference between 2-wire, 3-wire and 4-wire PT100 connection?

In a 2-wire connection the lead resistance is added to the measurement and is not compensated. In a 3-wire connection the instrument measures the lead resistance and subtracts it, provided the three leads are equal. In a 4-wire connection current and voltage use separate wire pairs, so lead resistance does not affect the reading. Example: a 10 m run of 0.5 mm² copper (20 m round trip) is about 0.69 Ω, which corresponds to roughly 1.8 °C of reading error on a 2-wire Pt100 and roughly 0.18 °C on a Pt1000.

Q: What do tolerance classes AA, A and B mean?

IEC 60751 defines the permitted temperature deviation: class AA ±(0.10 + 0.0017·|t|) °C, class A ±(0.15 + 0.0020·|t|) °C and class B ±(0.30 + 0.0050·|t|) °C. At 0 °C these are ±0.10, ±0.15 and ±0.30 °C respectively. The class applies to the sensing element only; transmitter, cable and installation errors add to it. The valid temperature ranges differ for wire-wound and thin-film elements.

A full table from -200 to +850 °C in 1 °C steps per IEC 60751, a two-way calculator, a PT100 versus PT1000 comparison, 2/3/4-wire connection and tolerance classes. The table is static HTML and readable with JavaScript turned off.

Calculator

Temperature to Resistance and Back

Type a value and the result updates instantly. You can use a comma or a dot.

Pt100	–
Pt1000	–

Quick Reference

Pt100 and Pt1000 Resistance at Common Temperatures

IEC 60751 (α = 0.00385 °C⁻¹) values; Pt100 to two decimals, Pt1000 to one decimal.

°C	Pt100 (Ω)	Pt1000 (Ω)
-200	18.52	185.2
-100	60.26	602.6
-50	80.31	803.1
0	100.00	1000.0
25	109.73	1097.3
50	119.40	1194.0
100	138.51	1385.1
150	157.33	1573.3
200	175.86	1758.6
250	194.10	1941.0
300	212.05	2120.5
400	247.09	2470.9
500	280.98	2809.8
600	313.71	3137.1
700	345.28	3452.8
850	390.48	3904.8

Formula

IEC 60751 Callendar–Van Dusen Equation

The resistance of a platinum resistance thermometer (RTD) is a second-order function of temperature; below 0 °C a fourth-order correction term is added.

t ≥ 0 °C: R(t) = R0 · (1 + A·t + B·t²)
t < 0 °C: R(t) = R0 · [1 + A·t + B·t² + C·(t − 100)·t³]

A = 3.9083×10⁻³ °C⁻¹ · B = −5.775×10⁻⁷ °C⁻² · C = −4.183×10⁻¹² °C⁻⁴ (for t < 0 only). R0 = 100 Ω (Pt100) or 1000 Ω (Pt1000). The mean temperature coefficient between 0 and 100 °C is α = 0.00385 °C⁻¹.

In the reverse direction (for t ≥ 0) temperature is solved directly:

t = (−A + √(A² − 4·B·(1 − R/R0))) / (2·B)

Below 0 °C the equation is solved iteratively (Newton's method); the calculator does this automatically. Near 0 °C the sensitivity is about 0.39 Ω/°C for Pt100 and about 3.9 Ω/°C for Pt1000, decreasing slightly with temperature because of the B term.

Source: IEC 60751 (EN 60751) industrial platinum resistance thermometers. Table values are computed from the equation and rounded; they do not replace a calibration certificate.

PT100 vs PT1000

PT100 or PT1000?

Property	Pt100	Pt1000
Resistance at 0 °C	100.00 Ω	1000.0 Ω
Resistance at 100 °C	138.51 Ω	1385.1 Ω
Sensitivity (near 0 °C)	≈ 0.39 Ω/°C	≈ 3.9 Ω/°C
Temperature error from the same lead resistance (2-wire)	Reference	Ten times smaller
Selection criterion	Input type of the instrument it connects to	Input type of the instrument it connects to

The main accuracy differences come from the connection method, cable length and measuring instrument rather than from the sensor type. For the same element class (AA/A/B), the temperature tolerance is the same for Pt100 and Pt1000.

Wiring

2-Wire, 3-Wire and 4-Wire Connection

Connection	Wires	Effect of lead resistance	Typical use
2-wire	2	Lead resistance adds to the measurement; no compensation.	Short cable, low accuracy requirement; the effect is smaller with Pt1000.
3-wire	3	If the three leads are equal the instrument measures and subtracts lead resistance.	Common in industry; long runs.
4-wire	4	Current and voltage use separate pairs; lead resistance does not affect the reading.	Laboratory, calibration, high accuracy.

Worked example. Taking the resistivity of copper as 0.01724 Ω·mm²/m, a 10 m run of 0.5 mm² cable (20 m round trip) has a resistance of 0.69 Ω. In a 2-wire connection this causes a positive reading error of about 1.8 °C on a Pt100 and about 0.18 °C on a Pt1000 (using the sensitivity near 0 °C). In 3-wire and 4-wire connections most of this error is eliminated.

Tolerance

IEC 60751 Tolerance Classes: AA, A, B

The permitted deviation depends on class and temperature; t is the absolute temperature value in °C.

Class	Tolerance (°C)	Wire-wound: valid range	Thin-film: valid range	At 0 °C (°C)	At 100 °C (°C)	At 0 °C, Pt100 (Ω)
AA (1/3 B)	±(0.10 + 0.0017·\|t\|)	-50…+250 °C	0…+150 °C	±0.10	±0.27	±0.04
A	±(0.15 + 0.0020·\|t\|)	-100…+450 °C	-30…+300 °C	±0.15	±0.35	±0.06
B	±(0.30 + 0.0050·\|t\|)	-196…+600 °C	-50…+500 °C	±0.30	±0.80	±0.12

The class defines only the permitted deviation of the sensing element. Transmitter, cable (especially in a 2-wire connection) and installation errors add to it. For Pt1000 the deviation in Ω is ten times that of Pt100; the tolerance in °C is the same.

Full Table

Pt100 and Pt1000 Resistance Table: -200…+850 °C in 1 °C Steps

The table is static HTML; open a temperature band to read it. Use Ctrl+F to find a specific temperature.

-200 … -101 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
-200	18.52	185.2
-199	18.95	189.5
-198	19.38	193.8
-197	19.82	198.2
-196	20.25	202.5
-195	20.68	206.8
-194	21.11	211.1
-193	21.54	215.4
-192	21.97	219.7
-191	22.40	224.0
-190	22.83	228.3
-189	23.25	232.5
-188	23.68	236.8
-187	24.11	241.1
-186	24.54	245.4
-185	24.97	249.7
-184	25.39	253.9
-183	25.82	258.2
-182	26.24	262.4
-181	26.67	266.7
-180	27.10	271.0
-179	27.52	275.2
-178	27.95	279.5
-177	28.37	283.7
-176	28.80	288.0
-175	29.22	292.2
-174	29.64	296.4
-173	30.07	300.7
-172	30.49	304.9
-171	30.91	309.1
-170	31.34	313.4
-169	31.76	317.6
-168	32.18	321.8
-167	32.60	326.0
-166	33.02	330.2
-165	33.44	334.4
-164	33.86	338.6
-163	34.28	342.8
-162	34.70	347.0
-161	35.12	351.2
-160	35.54	355.4
-159	35.96	359.6
-158	36.38	363.8
-157	36.80	368.0
-156	37.22	372.2
-155	37.64	376.4
-154	38.05	380.5
-153	38.47	384.7
-152	38.89	388.9
-151	39.31	393.1
-150	39.72	397.2
-149	40.14	401.4
-148	40.56	405.6
-147	40.97	409.7
-146	41.39	413.9
-145	41.80	418.0
-144	42.22	422.2
-143	42.63	426.3
-142	43.05	430.5
-141	43.46	434.6
-140	43.88	438.8
-139	44.29	442.9
-138	44.70	447.0
-137	45.12	451.2
-136	45.53	455.3
-135	45.94	459.4
-134	46.36	463.6
-133	46.77	467.7
-132	47.18	471.8
-131	47.59	475.9
-130	48.00	480.0
-129	48.42	484.2
-128	48.83	488.3
-127	49.24	492.4
-126	49.65	496.5
-125	50.06	500.6
-124	50.47	504.7
-123	50.88	508.8
-122	51.29	512.9
-121	51.70	517.0
-120	52.11	521.1
-119	52.52	525.2
-118	52.93	529.3
-117	53.34	533.4
-116	53.75	537.5
-115	54.15	541.5
-114	54.56	545.6
-113	54.97	549.7
-112	55.38	553.8
-111	55.79	557.9
-110	56.19	561.9
-109	56.60	566.0
-108	57.01	570.1
-107	57.41	574.1
-106	57.82	578.2
-105	58.23	582.3
-104	58.63	586.3
-103	59.04	590.4
-102	59.44	594.4
-101	59.85	598.5

-100 … -1 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
-100	60.26	602.6
-99	60.66	606.6
-98	61.07	610.7
-97	61.47	614.7
-96	61.88	618.8
-95	62.28	622.8
-94	62.68	626.8
-93	63.09	630.9
-92	63.49	634.9
-91	63.90	639.0
-90	64.30	643.0
-89	64.70	647.0
-88	65.11	651.1
-87	65.51	655.1
-86	65.91	659.1
-85	66.31	663.1
-84	66.72	667.2
-83	67.12	671.2
-82	67.52	675.2
-81	67.92	679.2
-80	68.33	683.3
-79	68.73	687.3
-78	69.13	691.3
-77	69.53	695.3
-76	69.93	699.3
-75	70.33	703.3
-74	70.73	707.3
-73	71.13	711.3
-72	71.53	715.3
-71	71.93	719.3
-70	72.33	723.3
-69	72.73	727.3
-68	73.13	731.3
-67	73.53	735.3
-66	73.93	739.3
-65	74.33	743.3
-64	74.73	747.3
-63	75.13	751.3
-62	75.53	755.3
-61	75.93	759.3
-60	76.33	763.3
-59	76.73	767.3
-58	77.12	771.2
-57	77.52	775.2
-56	77.92	779.2
-55	78.32	783.2
-54	78.72	787.2
-53	79.11	791.1
-52	79.51	795.1
-51	79.91	799.1
-50	80.31	803.1
-49	80.70	807.0
-48	81.10	811.0
-47	81.50	815.0
-46	81.89	818.9
-45	82.29	822.9
-44	82.69	826.9
-43	83.08	830.8
-42	83.48	834.8
-41	83.87	838.7
-40	84.27	842.7
-39	84.67	846.7
-38	85.06	850.6
-37	85.46	854.6
-36	85.85	858.5
-35	86.25	862.5
-34	86.64	866.4
-33	87.04	870.4
-32	87.43	874.3
-31	87.83	878.3
-30	88.22	882.2
-29	88.62	886.2
-28	89.01	890.1
-27	89.40	894.0
-26	89.80	898.0
-25	90.19	901.9
-24	90.59	905.9
-23	90.98	909.8
-22	91.37	913.7
-21	91.77	917.7
-20	92.16	921.6
-19	92.55	925.5
-18	92.95	929.5
-17	93.34	933.4
-16	93.73	937.3
-15	94.12	941.2
-14	94.52	945.2
-13	94.91	949.1
-12	95.30	953.0
-11	95.69	956.9
-10	96.09	960.9
-9	96.48	964.8
-8	96.87	968.7
-7	97.26	972.6
-6	97.65	976.5
-5	98.04	980.4
-4	98.44	984.4
-3	98.83	988.3
-2	99.22	992.2
-1	99.61	996.1

0 … 99 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
0	100.00	1000.0
1	100.39	1003.9
2	100.78	1007.8
3	101.17	1011.7
4	101.56	1015.6
5	101.95	1019.5
6	102.34	1023.4
7	102.73	1027.3
8	103.12	1031.2
9	103.51	1035.1
10	103.90	1039.0
11	104.29	1042.9
12	104.68	1046.8
13	105.07	1050.7
14	105.46	1054.6
15	105.85	1058.5
16	106.24	1062.4
17	106.63	1066.3
18	107.02	1070.2
19	107.40	1074.0
20	107.79	1077.9
21	108.18	1081.8
22	108.57	1085.7
23	108.96	1089.6
24	109.35	1093.5
25	109.73	1097.3
26	110.12	1101.2
27	110.51	1105.1
28	110.90	1109.0
29	111.29	1112.9
30	111.67	1116.7
31	112.06	1120.6
32	112.45	1124.5
33	112.83	1128.3
34	113.22	1132.2
35	113.61	1136.1
36	114.00	1140.0
37	114.38	1143.8
38	114.77	1147.7
39	115.15	1151.5
40	115.54	1155.4
41	115.93	1159.3
42	116.31	1163.1
43	116.70	1167.0
44	117.08	1170.8
45	117.47	1174.7
46	117.86	1178.6
47	118.24	1182.4
48	118.63	1186.3
49	119.01	1190.1
50	119.40	1194.0
51	119.78	1197.8
52	120.17	1201.7
53	120.55	1205.5
54	120.94	1209.4
55	121.32	1213.2
56	121.71	1217.1
57	122.09	1220.9
58	122.47	1224.7
59	122.86	1228.6
60	123.24	1232.4
61	123.63	1236.3
62	124.01	1240.1
63	124.39	1243.9
64	124.78	1247.8
65	125.16	1251.6
66	125.54	1255.4
67	125.93	1259.3
68	126.31	1263.1
69	126.69	1266.9
70	127.08	1270.8
71	127.46	1274.6
72	127.84	1278.4
73	128.22	1282.2
74	128.61	1286.1
75	128.99	1289.9
76	129.37	1293.7
77	129.75	1297.5
78	130.13	1301.3
79	130.52	1305.2
80	130.90	1309.0
81	131.28	1312.8
82	131.66	1316.6
83	132.04	1320.4
84	132.42	1324.2
85	132.80	1328.0
86	133.18	1331.8
87	133.57	1335.7
88	133.95	1339.5
89	134.33	1343.3
90	134.71	1347.1
91	135.09	1350.9
92	135.47	1354.7
93	135.85	1358.5
94	136.23	1362.3
95	136.61	1366.1
96	136.99	1369.9
97	137.37	1373.7
98	137.75	1377.5
99	138.13	1381.3

100 … 199 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
100	138.51	1385.1
101	138.88	1388.8
102	139.26	1392.6
103	139.64	1396.4
104	140.02	1400.2
105	140.40	1404.0
106	140.78	1407.8
107	141.16	1411.6
108	141.54	1415.4
109	141.91	1419.1
110	142.29	1422.9
111	142.67	1426.7
112	143.05	1430.5
113	143.43	1434.3
114	143.80	1438.0
115	144.18	1441.8
116	144.56	1445.6
117	144.94	1449.4
118	145.31	1453.1
119	145.69	1456.9
120	146.07	1460.7
121	146.44	1464.4
122	146.82	1468.2
123	147.20	1472.0
124	147.57	1475.7
125	147.95	1479.5
126	148.33	1483.3
127	148.70	1487.0
128	149.08	1490.8
129	149.46	1494.6
130	149.83	1498.3
131	150.21	1502.1
132	150.58	1505.8
133	150.96	1509.6
134	151.33	1513.3
135	151.71	1517.1
136	152.08	1520.8
137	152.46	1524.6
138	152.83	1528.3
139	153.21	1532.1
140	153.58	1535.8
141	153.96	1539.6
142	154.33	1543.3
143	154.71	1547.1
144	155.08	1550.8
145	155.46	1554.6
146	155.83	1558.3
147	156.20	1562.0
148	156.58	1565.8
149	156.95	1569.5
150	157.33	1573.3
151	157.70	1577.0
152	158.07	1580.7
153	158.45	1584.5
154	158.82	1588.2
155	159.19	1591.9
156	159.56	1595.6
157	159.94	1599.4
158	160.31	1603.1
159	160.68	1606.8
160	161.05	1610.5
161	161.43	1614.3
162	161.80	1618.0
163	162.17	1621.7
164	162.54	1625.4
165	162.91	1629.1
166	163.29	1632.9
167	163.66	1636.6
168	164.03	1640.3
169	164.40	1644.0
170	164.77	1647.7
171	165.14	1651.4
172	165.51	1655.1
173	165.89	1658.9
174	166.26	1662.6
175	166.63	1666.3
176	167.00	1670.0
177	167.37	1673.7
178	167.74	1677.4
179	168.11	1681.1
180	168.48	1684.8
181	168.85	1688.5
182	169.22	1692.2
183	169.59	1695.9
184	169.96	1699.6
185	170.33	1703.3
186	170.70	1707.0
187	171.07	1710.7
188	171.43	1714.3
189	171.80	1718.0
190	172.17	1721.7
191	172.54	1725.4
192	172.91	1729.1
193	173.28	1732.8
194	173.65	1736.5
195	174.02	1740.2
196	174.38	1743.8
197	174.75	1747.5
198	175.12	1751.2
199	175.49	1754.9

200 … 299 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
200	175.86	1758.6
201	176.22	1762.2
202	176.59	1765.9
203	176.96	1769.6
204	177.33	1773.3
205	177.69	1776.9
206	178.06	1780.6
207	178.43	1784.3
208	178.79	1787.9
209	179.16	1791.6
210	179.53	1795.3
211	179.89	1798.9
212	180.26	1802.6
213	180.63	1806.3
214	180.99	1809.9
215	181.36	1813.6
216	181.72	1817.2
217	182.09	1820.9
218	182.46	1824.6
219	182.82	1828.2
220	183.19	1831.9
221	183.55	1835.5
222	183.92	1839.2
223	184.28	1842.8
224	184.65	1846.5
225	185.01	1850.1
226	185.38	1853.8
227	185.74	1857.4
228	186.11	1861.1
229	186.47	1864.7
230	186.84	1868.4
231	187.20	1872.0
232	187.56	1875.6
233	187.93	1879.3
234	188.29	1882.9
235	188.66	1886.6
236	189.02	1890.2
237	189.38	1893.8
238	189.75	1897.5
239	190.11	1901.1
240	190.47	1904.7
241	190.84	1908.4
242	191.20	1912.0
243	191.56	1915.6
244	191.92	1919.2
245	192.29	1922.9
246	192.65	1926.5
247	193.01	1930.1
248	193.37	1933.7
249	193.74	1937.4
250	194.10	1941.0
251	194.46	1944.6
252	194.82	1948.2
253	195.18	1951.8
254	195.55	1955.5
255	195.91	1959.1
256	196.27	1962.7
257	196.63	1966.3
258	196.99	1969.9
259	197.35	1973.5
260	197.71	1977.1
261	198.07	1980.7
262	198.43	1984.3
263	198.79	1987.9
264	199.15	1991.5
265	199.51	1995.1
266	199.87	1998.7
267	200.23	2002.3
268	200.59	2005.9
269	200.95	2009.5
270	201.31	2013.1
271	201.67	2016.7
272	202.03	2020.3
273	202.39	2023.9
274	202.75	2027.5
275	203.11	2031.1
276	203.47	2034.7
277	203.83	2038.3
278	204.19	2041.9
279	204.55	2045.5
280	204.90	2049.0
281	205.26	2052.6
282	205.62	2056.2
283	205.98	2059.8
284	206.34	2063.4
285	206.70	2067.0
286	207.05	2070.5
287	207.41	2074.1
288	207.77	2077.7
289	208.13	2081.3
290	208.48	2084.8
291	208.84	2088.4
292	209.20	2092.0
293	209.56	2095.6
294	209.91	2099.1
295	210.27	2102.7
296	210.63	2106.3
297	210.98	2109.8
298	211.34	2113.4
299	211.70	2117.0

300 … 399 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
300	212.05	2120.5
301	212.41	2124.1
302	212.76	2127.6
303	213.12	2131.2
304	213.48	2134.8
305	213.83	2138.3
306	214.19	2141.9
307	214.54	2145.4
308	214.90	2149.0
309	215.25	2152.5
310	215.61	2156.1
311	215.96	2159.6
312	216.32	2163.2
313	216.67	2166.7
314	217.03	2170.3
315	217.38	2173.8
316	217.74	2177.4
317	218.09	2180.9
318	218.44	2184.4
319	218.80	2188.0
320	219.15	2191.5
321	219.51	2195.1
322	219.86	2198.6
323	220.21	2202.1
324	220.57	2205.7
325	220.92	2209.2
326	221.27	2212.7
327	221.63	2216.3
328	221.98	2219.8
329	222.33	2223.3
330	222.68	2226.8
331	223.04	2230.4
332	223.39	2233.9
333	223.74	2237.4
334	224.09	2240.9
335	224.45	2244.5
336	224.80	2248.0
337	225.15	2251.5
338	225.50	2255.0
339	225.85	2258.5
340	226.21	2262.1
341	226.56	2265.6
342	226.91	2269.1
343	227.26	2272.6
344	227.61	2276.1
345	227.96	2279.6
346	228.31	2283.1
347	228.66	2286.6
348	229.02	2290.2
349	229.37	2293.7
350	229.72	2297.2
351	230.07	2300.7
352	230.42	2304.2
353	230.77	2307.7
354	231.12	2311.2
355	231.47	2314.7
356	231.82	2318.2
357	232.17	2321.7
358	232.52	2325.2
359	232.87	2328.7
360	233.21	2332.1
361	233.56	2335.6
362	233.91	2339.1
363	234.26	2342.6
364	234.61	2346.1
365	234.96	2349.6
366	235.31	2353.1
367	235.66	2356.6
368	236.00	2360.0
369	236.35	2363.5
370	236.70	2367.0
371	237.05	2370.5
372	237.40	2374.0
373	237.74	2377.4
374	238.09	2380.9
375	238.44	2384.4
376	238.79	2387.9
377	239.13	2391.3
378	239.48	2394.8
379	239.83	2398.3
380	240.18	2401.8
381	240.52	2405.2
382	240.87	2408.7
383	241.22	2412.2
384	241.56	2415.6
385	241.91	2419.1
386	242.26	2422.6
387	242.60	2426.0
388	242.95	2429.5
389	243.29	2432.9
390	243.64	2436.4
391	243.99	2439.9
392	244.33	2443.3
393	244.68	2446.8
394	245.02	2450.2
395	245.37	2453.7
396	245.71	2457.1
397	246.06	2460.6
398	246.40	2464.0
399	246.75	2467.5

400 … 499 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
400	247.09	2470.9
401	247.44	2474.4
402	247.78	2477.8
403	248.13	2481.3
404	248.47	2484.7
405	248.81	2488.1
406	249.16	2491.6
407	249.50	2495.0
408	249.85	2498.5
409	250.19	2501.9
410	250.53	2505.3
411	250.88	2508.8
412	251.22	2512.2
413	251.56	2515.6
414	251.91	2519.1
415	252.25	2522.5
416	252.59	2525.9
417	252.93	2529.3
418	253.28	2532.8
419	253.62	2536.2
420	253.96	2539.6
421	254.30	2543.0
422	254.65	2546.5
423	254.99	2549.9
424	255.33	2553.3
425	255.67	2556.7
426	256.01	2560.1
427	256.35	2563.5
428	256.70	2567.0
429	257.04	2570.4
430	257.38	2573.8
431	257.72	2577.2
432	258.06	2580.6
433	258.40	2584.0
434	258.74	2587.4
435	259.08	2590.8
436	259.42	2594.2
437	259.76	2597.6
438	260.10	2601.0
439	260.44	2604.4
440	260.78	2607.8
441	261.12	2611.2
442	261.46	2614.6
443	261.80	2618.0
444	262.14	2621.4
445	262.48	2624.8
446	262.82	2628.2
447	263.16	2631.6
448	263.50	2635.0
449	263.84	2638.4
450	264.18	2641.8
451	264.52	2645.2
452	264.86	2648.6
453	265.20	2652.0
454	265.53	2655.3
455	265.87	2658.7
456	266.21	2662.1
457	266.55	2665.5
458	266.89	2668.9
459	267.22	2672.2
460	267.56	2675.6
461	267.90	2679.0
462	268.24	2682.4
463	268.57	2685.7
464	268.91	2689.1
465	269.25	2692.5
466	269.59	2695.9
467	269.92	2699.2
468	270.26	2702.6
469	270.60	2706.0
470	270.93	2709.3
471	271.27	2712.7
472	271.61	2716.1
473	271.94	2719.4
474	272.28	2722.8
475	272.61	2726.1
476	272.95	2729.5
477	273.29	2732.9
478	273.62	2736.2
479	273.96	2739.6
480	274.29	2742.9
481	274.63	2746.3
482	274.96	2749.6
483	275.30	2753.0
484	275.63	2756.3
485	275.97	2759.7
486	276.30	2763.0
487	276.64	2766.4
488	276.97	2769.7
489	277.31	2773.1
490	277.64	2776.4
491	277.98	2779.8
492	278.31	2783.1
493	278.64	2786.4
494	278.98	2789.8
495	279.31	2793.1
496	279.64	2796.4
497	279.98	2799.8
498	280.31	2803.1
499	280.64	2806.4

500 … 599 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
500	280.98	2809.8
501	281.31	2813.1
502	281.64	2816.4
503	281.98	2819.8
504	282.31	2823.1
505	282.64	2826.4
506	282.97	2829.7
507	283.31	2833.1
508	283.64	2836.4
509	283.97	2839.7
510	284.30	2843.0
511	284.63	2846.3
512	284.97	2849.7
513	285.30	2853.0
514	285.63	2856.3
515	285.96	2859.6
516	286.29	2862.9
517	286.62	2866.2
518	286.95	2869.5
519	287.29	2872.9
520	287.62	2876.2
521	287.95	2879.5
522	288.28	2882.8
523	288.61	2886.1
524	288.94	2889.4
525	289.27	2892.7
526	289.60	2896.0
527	289.93	2899.3
528	290.26	2902.6
529	290.59	2905.9
530	290.92	2909.2
531	291.25	2912.5
532	291.58	2915.8
533	291.91	2919.1
534	292.24	2922.4
535	292.56	2925.6
536	292.89	2928.9
537	293.22	2932.2
538	293.55	2935.5
539	293.88	2938.8
540	294.21	2942.1
541	294.54	2945.4
542	294.86	2948.6
543	295.19	2951.9
544	295.52	2955.2
545	295.85	2958.5
546	296.18	2961.8
547	296.50	2965.0
548	296.83	2968.3
549	297.16	2971.6
550	297.49	2974.9
551	297.81	2978.1
552	298.14	2981.4
553	298.47	2984.7
554	298.80	2988.0
555	299.12	2991.2
556	299.45	2994.5
557	299.78	2997.8
558	300.10	3001.0
559	300.43	3004.3
560	300.75	3007.5
561	301.08	3010.8
562	301.41	3014.1
563	301.73	3017.3
564	302.06	3020.6
565	302.38	3023.8
566	302.71	3027.1
567	303.03	3030.3
568	303.36	3033.6
569	303.69	3036.9
570	304.01	3040.1
571	304.34	3043.4
572	304.66	3046.6
573	304.98	3049.8
574	305.31	3053.1
575	305.63	3056.3
576	305.96	3059.6
577	306.28	3062.8
578	306.61	3066.1
579	306.93	3069.3
580	307.25	3072.5
581	307.58	3075.8
582	307.90	3079.0
583	308.23	3082.3
584	308.55	3085.5
585	308.87	3088.7
586	309.20	3092.0
587	309.52	3095.2
588	309.84	3098.4
589	310.16	3101.6
590	310.49	3104.9
591	310.81	3108.1
592	311.13	3111.3
593	311.45	3114.5
594	311.78	3117.8
595	312.10	3121.0
596	312.42	3124.2
597	312.74	3127.4
598	313.06	3130.6
599	313.39	3133.9

600 … 699 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
600	313.71	3137.1
601	314.03	3140.3
602	314.35	3143.5
603	314.67	3146.7
604	314.99	3149.9
605	315.31	3153.1
606	315.64	3156.4
607	315.96	3159.6
608	316.28	3162.8
609	316.60	3166.0
610	316.92	3169.2
611	317.24	3172.4
612	317.56	3175.6
613	317.88	3178.8
614	318.20	3182.0
615	318.52	3185.2
616	318.84	3188.4
617	319.16	3191.6
618	319.48	3194.8
619	319.80	3198.0
620	320.12	3201.2
621	320.43	3204.3
622	320.75	3207.5
623	321.07	3210.7
624	321.39	3213.9
625	321.71	3217.1
626	322.03	3220.3
627	322.35	3223.5
628	322.67	3226.7
629	322.98	3229.8
630	323.30	3233.0
631	323.62	3236.2
632	323.94	3239.4
633	324.26	3242.6
634	324.57	3245.7
635	324.89	3248.9
636	325.21	3252.1
637	325.53	3255.3
638	325.84	3258.4
639	326.16	3261.6
640	326.48	3264.8
641	326.79	3267.9
642	327.11	3271.1
643	327.43	3274.3
644	327.74	3277.4
645	328.06	3280.6
646	328.38	3283.8
647	328.69	3286.9
648	329.01	3290.1
649	329.32	3293.2
650	329.64	3296.4
651	329.96	3299.6
652	330.27	3302.7
653	330.59	3305.9
654	330.90	3309.0
655	331.22	3312.2
656	331.53	3315.3
657	331.85	3318.5
658	332.16	3321.6
659	332.48	3324.8
660	332.79	3327.9
661	333.11	3331.1
662	333.42	3334.2
663	333.74	3337.4
664	334.05	3340.5
665	334.36	3343.6
666	334.68	3346.8
667	334.99	3349.9
668	335.31	3353.1
669	335.62	3356.2
670	335.93	3359.3
671	336.25	3362.5
672	336.56	3365.6
673	336.87	3368.7
674	337.18	3371.8
675	337.50	3375.0
676	337.81	3378.1
677	338.12	3381.2
678	338.44	3384.4
679	338.75	3387.5
680	339.06	3390.6
681	339.37	3393.7
682	339.69	3396.9
683	340.00	3400.0
684	340.31	3403.1
685	340.62	3406.2
686	340.93	3409.3
687	341.24	3412.4
688	341.56	3415.6
689	341.87	3418.7
690	342.18	3421.8
691	342.49	3424.9
692	342.80	3428.0
693	343.11	3431.1
694	343.42	3434.2
695	343.73	3437.3
696	344.04	3440.4
697	344.35	3443.5
698	344.66	3446.6
699	344.97	3449.7

700 … 799 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
700	345.28	3452.8
701	345.59	3455.9
702	345.90	3459.0
703	346.21	3462.1
704	346.52	3465.2
705	346.83	3468.3
706	347.14	3471.4
707	347.45	3474.5
708	347.76	3477.6
709	348.07	3480.7
710	348.38	3483.8
711	348.69	3486.9
712	348.99	3489.9
713	349.30	3493.0
714	349.61	3496.1
715	349.92	3499.2
716	350.23	3502.3
717	350.54	3505.4
718	350.84	3508.4
719	351.15	3511.5
720	351.46	3514.6
721	351.77	3517.7
722	352.08	3520.8
723	352.38	3523.8
724	352.69	3526.9
725	353.00	3530.0
726	353.30	3533.0
727	353.61	3536.1
728	353.92	3539.2
729	354.22	3542.2
730	354.53	3545.3
731	354.84	3548.4
732	355.14	3551.4
733	355.45	3554.5
734	355.76	3557.6
735	356.06	3560.6
736	356.37	3563.7
737	356.67	3566.7
738	356.98	3569.8
739	357.28	3572.8
740	357.59	3575.9
741	357.90	3579.0
742	358.20	3582.0
743	358.51	3585.1
744	358.81	3588.1
745	359.12	3591.2
746	359.42	3594.2
747	359.72	3597.2
748	360.03	3600.3
749	360.33	3603.3
750	360.64	3606.4
751	360.94	3609.4
752	361.25	3612.5
753	361.55	3615.5
754	361.85	3618.5
755	362.16	3621.6
756	362.46	3624.6
757	362.76	3627.6
758	363.07	3630.7
759	363.37	3633.7
760	363.67	3636.7
761	363.98	3639.8
762	364.28	3642.8
763	364.58	3645.8
764	364.89	3648.9
765	365.19	3651.9
766	365.49	3654.9
767	365.79	3657.9
768	366.10	3661.0
769	366.40	3664.0
770	366.70	3667.0
771	367.00	3670.0
772	367.30	3673.0
773	367.60	3676.0
774	367.91	3679.1
775	368.21	3682.1
776	368.51	3685.1
777	368.81	3688.1
778	369.11	3691.1
779	369.41	3694.1
780	369.71	3697.1
781	370.01	3700.1
782	370.31	3703.1
783	370.61	3706.1
784	370.91	3709.1
785	371.21	3712.1
786	371.51	3715.1
787	371.81	3718.1
788	372.11	3721.1
789	372.41	3724.1
790	372.71	3727.1
791	373.01	3730.1
792	373.31	3733.1
793	373.61	3736.1
794	373.91	3739.1
795	374.21	3742.1
796	374.51	3745.1
797	374.81	3748.1
798	375.11	3751.1
799	375.41	3754.1

800 … 850 °C

°C	Pt100 (Ω)	Pt1000 (Ω)
800	375.70	3757.0
801	376.00	3760.0
802	376.30	3763.0
803	376.60	3766.0
804	376.90	3769.0
805	377.19	3771.9
806	377.49	3774.9
807	377.79	3777.9
808	378.09	3780.9
809	378.39	3783.9
810	378.68	3786.8
811	378.98	3789.8
812	379.28	3792.8
813	379.57	3795.7
814	379.87	3798.7
815	380.17	3801.7
816	380.46	3804.6
817	380.76	3807.6
818	381.06	3810.6
819	381.35	3813.5
820	381.65	3816.5
821	381.95	3819.5
822	382.24	3822.4
823	382.54	3825.4
824	382.83	3828.3
825	383.13	3831.3
826	383.42	3834.2
827	383.72	3837.2
828	384.01	3840.1
829	384.31	3843.1
830	384.60	3846.0
831	384.90	3849.0
832	385.19	3851.9
833	385.49	3854.9
834	385.78	3857.8
835	386.08	3860.8
836	386.37	3863.7
837	386.67	3866.7
838	386.96	3869.6
839	387.25	3872.5
840	387.55	3875.5
841	387.84	3878.4
842	388.14	3881.4
843	388.43	3884.3
844	388.72	3887.2
845	389.02	3890.2
846	389.31	3893.1
847	389.60	3896.0
848	389.90	3899.0
849	390.19	3901.9
850	390.48	3904.8

Sensors

Wenglor UniTemp and weFlux² Temperature Sensors

Mikron Proses supplies Wenglor temperature sensors for liquid and gas lines. The UniTemp FFAT042 has an integrated display and two PNP switching outputs and measures 0…140 °C (measurement accuracy ±1 °C, IP67, G 1/2" process connection). The temperature sensors of the weFlux² family are listed in the brochure for -50…150 °C and -50…200 °C with an IO-Link option and a PT100/PT1000 output option. The instrument the sensor connects to decides which output (resistance, switching, IO-Link) is needed; send us your application and we will select the right model together.

Wenglor sensors · Wenglor weFlux² sensors · Online measurement and automation · All tools

PT100 FAQ

PT100 and PT1000: Frequently Asked Questions

Formula, resistance values, wiring and tolerance classes.

What is the PT100 resistance-temperature formula?

IEC 60751 uses the Callendar–Van Dusen equation for platinum resistance thermometers. At 0 °C and above, R(t) = R0·(1 + A·t + B·t²) with A = 3.9083×10⁻³ °C⁻¹ and B = −5.775×10⁻⁷ °C⁻². Below 0 °C the term C·(t − 100)·t³ is added, with C = −4.183×10⁻¹² °C⁻⁴. R0 is 100 Ω for Pt100 and 1000 Ω for Pt1000. The table and calculator on this page are generated from this equation.

What is the resistance of a PT100 at 100 °C and a PT1000 at 0 °C?

Per IEC 60751, a Pt100 reads 100.00 Ω at 0 °C and 138.51 Ω at 100 °C. A Pt1000 reads 1000.0 Ω at 0 °C and 1385.1 Ω at 100 °C. At -100 °C a Pt100 is about 60.26 Ω and a Pt1000 about 602.6 Ω. Every value from -200 to +850 °C is listed in 1 °C steps in the full table on this page.

What is the difference between PT100 and PT1000?

Both are platinum sensors of the same standard; the difference is the nominal resistance at 0 °C (100 Ω versus 1000 Ω). A Pt1000 is ten times more sensitive (about 3.9 Ω/°C), so the same lead resistance causes a temperature error ten times smaller. The input of the instrument the sensor connects to decides which one you use; follow the sensor type stated in that instrument's manual.

What is the difference between 2-wire, 3-wire and 4-wire PT100 connection?

In a 2-wire connection the lead resistance is added to the measurement and is not compensated. In a 3-wire connection the instrument measures the lead resistance and subtracts it, provided the three leads are equal. In a 4-wire connection current and voltage use separate wire pairs, so lead resistance does not affect the reading. Example: a 10 m run of 0.5 mm² copper (20 m round trip) is about 0.69 Ω, which corresponds to roughly 1.8 °C of reading error on a 2-wire Pt100 and roughly 0.18 °C on a Pt1000.

What do tolerance classes AA, A and B mean?

IEC 60751 defines the permitted temperature deviation: class AA ±(0.10 + 0.0017·|t|) °C, class A ±(0.15 + 0.0020·|t|) °C and class B ±(0.30 + 0.0050·|t|) °C. At 0 °C these are ±0.10, ±0.15 and ±0.30 °C respectively. The class applies to the sensing element only; transmitter, cable and installation errors add to it. The valid temperature ranges differ for wire-wound and thin-film elements.

Let Us Select Your Temperature Measurement Together

Share the measuring range, medium, process connection and the instrument the signal goes to, and we will define the sensor and transmitter together.

Request a Quotation [email protected]

Planning a project? Send us your flow rate, feed water source and target water quality to [email protected] — our engineers will reply with a technical proposal.