Pt1000 | GUILCOR SENSORS

Pt1000
Temperature sensors

Pt1000 temperature sensors provide strong signal levels, ideal for long cable lengths and modern electronic measurement systems.

Maximum precision
+/- 0.10°K

Minimum temperature
-200°C

Maximum temperature
+600°C

Minimum dimensions
2 x 8 x 30

Response time
Medium

Self-heating
Low

Price
Medium

Drift
Low

What is a Pt1000 sensor ?

The Pt1000 is a platinum resistance probe with a nominal value of 1000 Ω at 0 °C.

It is a modernized version of the Pt100, offering ten times the sensitivity and a higher output voltage.

Today, it is the most widely used RTD sensor in HVAC control systems, industrial automation, and embedded electronic devices.

Operating principle

The Pt1000 operates according to the Callendar–Van Dusen law:

R(T) = R_0 [1 + A·T + B·T^2 + C·(T - 100)·T^3]

with :

R_0 = 1000 Ω
A = 3,9083 × 10⁻³
B = -5,775 × 10⁻⁷
C = −4,183×10−12 (pour T < 0 °C)

Its higher resistance allows for better noise immunity, a stronger signal, and simplified integration into modern electronic systems.

Technical specifications

Parameter	Typical Value
Nominal resistance at 0 °C	1000 Ω
Temperature coefficient (α)	0,00385 °C⁻¹
Measurement range	−200 °C to +600 °C
Linearity	Excellent
Element material	Platinium pur (99,99 %)
Typical measuring current	0,1 → 0,3 mA
Response time	0,4 à 0,6 s
Long-term drift	< 0,05 °C/year

Wiring configuration

Type	Description	Precision
2-wire	Simple, sufficient for short distances.	✅ Good
3-wire	Partial compensation of the cable.	🏆 Excellent
4-wire	Useless in the majority of cases (high resistance).	💡 Very precise

Self-heating

Thanks to its high resistance, the Pt1000 produces a significant voltage for a very low current,

which limits self-heating to less than 0.01 °C, even in a closed environment.

Application areas

🏢 Heating, ventilation, and air conditioning (HVAC) systems

⚙️ Industrial automatic control

🚗 Embedded sensors in automobiles

🔬 Scientific and testing equipment

🧠 Connected measuring devices (IoT, smart sensors)

Should I choose a Pt1000 sensor ?

Strengths points

⚡ High and stable signal
→ With 1000 Ω at 0 °C, the Pt1000 delivers a voltage ten times stronger than a Pt100 → no amplifier needed in most circuits.
🧠 Simple integration
→ Ideal for microcontrollers, PLCs, and HVAC modules, it integrates directly onto standard analog inputs.
💡 Very low self-heating
→ Its reduced excitation current (0.1 to 0.3 mA) prevents any thermal drift, even during continuous operation.

Weaknesses points

💰 Slightly more expensive than NTC thermistors
→ Although more stable, it remains less economical for basic low-precision applications.
📉 Slightly lower sensitivity to Cu or Ni
→ The coefficient α of platinum remains lower than that of other metals, limiting the detection of very fine deviations (< 0.05 °C).
🧯 High-temperature drift
→ Beyond 600 °C, the Pt1000 may lose its stability if not encapsulated in a ceramic or glass tube.

Useful information

Here is some useful information regarding Pt1000 sensors.

Table of ohmic values

°C	0	1	2	3	4	5	6	7	8	9
0	100.00	100.39	100.78	101.17	101.56	101.95	102.34	102.73	103.12	103.51
10	103.90	104.29	104.68	105.07	105.46	105.85	106.24	106.63	107.02	107.40
20	107.79	108.18	108.57	108.96	109.35	109.73	110.12	110.51	110.90	111.28
30	111.67	112.06	112.45	112.83	113.22	113.61	113.99	114.38	114.77	115.15
40	115.54	115.93	116.31	116.70	117.08	117.47	117.85	118.24	118.62	119.01
50	119.40	119.78	120.16	120.55	120.93	121.32	121.70	122.09	122.47	122.86
60	123.24	123.62	124.01	124.39	124.77	125.16	125.54	125.92	126.31	126.69
70	127.07	127.45	127.84	128.22	128.60	128.98	129.37	129.75	130.13	130.51
80	130.89	131.27	131.66	132.04	132.42	132.80	133.18	133.56	133.94	134.32
90	134.70	135.08	135.46	135.84	136.22	136.60	136.98	137.36	137.74	138.12
100	138.50	138.88	139.26	139.64	140.02	140.39	140.77	141.15	141.53	141.91
110	142.29	142.66	143.04	143.42	143.80	144.17	144.55	144.93	145.31	145.68
120	146.06	146.44	146.81	147.19	147.57	147.94	148.32	148.70	149.07	149.45
130	149.82	150.20	150.57	150.95	151.33	151.70	152.08	152.45	152.83	153.20
140	153.58	153.95	154.32	154.70	155.07	155.45	155.82	156.19	156.57	156.94
150	157.31	157.69	158.06	158.43	158.81	159.18	159.55	159.93	160.30	160.67
160	161.04	161.42	161.79	162.16	162.53	162.90	163.27	163.65	164.02	164.39
170	164.76	165.13	165.50	165.87	166.24	166.61	166.98	167.35	167.72	168.09
180	168.46	168.83	169.20	169.57	169.94	170.31	170.68	171.05	171.42	171.19
190	172.16	172.53	172.90	173.26	173.63	174.00	174.37	174.74	175.10	175.47
200	175.84	176.21	176.57	176.94	177.31	177.68	178.04	178.41	178.78	179.14
210	179.51	179.88	180.24	180.61	180.97	181.34	181.71	182.07	182.44	182.80
220	183.17	183.53	183.90	184.26	184.63	184.99	185.36	185.72	186.09	186.45
230	186.82	187.18	187.54	187.91	188.27	188.63	189.00	189.36	189.72	190.09
240	190.45	190.81	191.18	191.54	191.90	192.26	192.63	192.99	193.35	193.71
250	194.07	194.44	194.80	195.16	195.52	195.88	196.24	196.60	196.96	197.33
260	197.69	198.05	198.41	198.77	199.13	199.49	199.85	200.21	200.57	200.93
270	201.29	201.65	202.01	202.36	202.72	203.08	203.44	203.80	204.16	204.52
280	204.88	205.23	205.59	205.95	206.31	206.67	207.02	207.38	207.74	208.10
290	208.45	208.81	209.17	209.52	209.88	210.24	210.59	210.95	211.31	211.66
300	212.02	212.37	212.73	213.09	213.44	213.8	214.15	214.51	214.86	215.22
310	215.57	215.93	216.28	216.64	216.99	217.35	217.70	218.05	218.41	218.76
320	219.12	219.47	219.82	220.18	220.53	220.88	221.24	221.59	221.94	222.29
330	222.65	223.00	223.35	223.70	224.06	224.41	224.76	225.11	225.46	225.81
340	226.17	226.52	226.87	227.22	227.57	227.92	228.27	228.62	228.97	229.32
350	229.67	230.02	230.37	230.72	231.07	231.42	231.77	232.12	232.47	232.82
360	233.17	233.52	233.87	234.22	234.56	234.91	235.26	235.61	235.96	236.31
370	236.65	237.00	237.35	237.70	238.04	238.39	238.74	239.09	239.43	239.78
380	240.13	240.47	240.82	241.17	241.51	241.86	242.20	242.55	242.90	243.24
390	243.59	243.93	244.28	244.62	244.97	245.31	245.66	246.00	246.35	246.69
400	247.04

Precision class table

Température (°C)	Classe B	Classe A	Classe 1/3 B (DIN)	Classe 1/10 B (DIN)
-200	1.30	0.55	0.39	0.38
-150	1.05	0.45	0.23	0.21
-100	0.80	0.35	0.15	0.12
-90	0.75	0.33	0.14	0.10
-80	0.70	0.31	0.13	0.09
-70	0.65	0.29	0.12	0.08
-60	0.60	0.27	0.11	0.07
-50	0.55	0.25	0.10	0.06
-40	0.50	0.23	0.10	0.06
-30	0.45	0.21	0.09	0.05
-20	0.40	0.19	0.09	0.04
-10	0.37	0.17	0.08	0.03
0	0.30	0.15	0.08	0.03
10	0.35	0.17	0.09	0.04
20	0.40	0.19	0.10	0.04
30	0.45	0.21	0.11	0.05
40	0.50	0.23	0.12	0.06
50	0.55	0.25	0.13	0.07
60	0.60	0.27	0.14	0.08
70	0.65	0.29	0.16	0.09
80	0.70	0.31	0.17	0.10
90	0.75	0.33	0.18	0.11
100	0.80	0.35	0.19	0.12
110	0.85	0.37	0.20	0.13
120	0.90	0.39	0.21	0.14
130	0.95	0.41	0.22	0.15
140	1.00	0.43	0.24	0.15
150	1.05	0.45	0.25	0.16
160	1.10	0.47	0.26	0.17
170	1.15	0.49	0.27	0.18
180	1.20	0.51	0.29	0.19
190	1.25	0.53	0.30	0.21
200	1.30	0.55	0.31	0.22

Example of application of the linearization equation of a PT1000

The Pt1000 follows the same normalized Callendar–Van Dusen equation as other platinum RTDs:

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

T = (−3,9083 × 10⁻³ + √[(3,9083 × 10⁻³)² − 4 × (−5,775 × 10⁻⁷) × (1 − 1192 / 1000)]) / [2 × (−5,775 × 10⁻⁷)]

T ≈ 49 °C

🔹 Example 1: calculation of R at 100 °C

R(100) = 1000 × [1 + 3,9083 × 10⁻³ × 100 − 5,775 × 10⁻⁷ × 100²]

R(100) = 1000 × (1 + 0,39083 − 0,005775)

R(100) = 1000 × 1,385055 = 1385,05 Ω

✅ Result: at 100 °C, the resistance is approximately 1385 Ω.

🔹 Example 2: calculating T from a measured R

We measure R=1192Ω. What is the temperature ?

R(T) = R₀ [1 + A·T + B·T² + C·(T − 100)·T³]

avec :

R₀ = 1000 Ω
A = 3,9083 × 10⁻³
B = −5,775 × 10⁻⁷
C = −4,183 × 10⁻¹² (pour T < 0 °C)

✅ Result: the corresponding temperature is approximately 49 °C.

🔹 Practical notes

The Callendar–Van Dusen equation is built-in by default in most HVAC converters and controllers.
For microcontrollers, one can use:
- either the direct equation;
- or a correspondence table R/T in increments of 0.1 °C.
The linearity of the Pt1000 ensures an error < ±0.05 °C over the range −50 °C → +300 °C.

Integration diagram in an electronic system

The Pt1000 generates a signal high enough to be read directly by an ADC converter without amplification.

It is the ideal choice for embedded systems or controllers with simple analog inputs.

🔹 Typical components of the assembly

Component	Function
RTD Pt1000 (2 or 3 wires)	Sensitive platinum element
Stable current source (~0.2 mA)	Probe power supply
Divider bridge / ADC	Conversion of voltage to numerical value
Microcontroller (Arduino, STM32, ESP32)	Calculation T = f(R)
RC filtering / shielding	Noise reduction and signal stabilization

🔹 Functional diagram (ASCII)

            +3.3 V
              │
     Power source (0.2 mA)
              │
           [ Pt1000 ]
       (2 or 3 armored wires)
           │        │
           │        │
        Divider bridge → ADC
                         │
                 [ Microcontroller ]
              (Calculation T = f(R) + display)

🔹 Operating Principle

1️⃣ Constant excitation : a stable current flows through the RTD.

→ At 0 °C: V = 1000 Ω × 0.2 mA = 0.2 V

→ At 100 °C: V ≈ 1385 Ω × 0.2 mA = 0.277 V

2️⃣ Direct reading : the voltage proportional to the temperature is measured by the voltage divider or the ADC.

3️⃣ Numerical calculation : the microcontroller applies the Callendar–Van Dusen equation or an R/T table.

🔹 Best Practices