One of the most prevalent types of platinum resistance thermometer is the Pt1000 sensor.
The term “Pt” refers to the fact that the sensor is constructed of platinum (Pt). The number 1000 denotes the sensor’s resistance of 1000 ohms (at 0°C). In two-wire applications, the PT1000 at Process Paramaters are preferred over Pt100 sensors because Pt1000s have lower lead resistance.
In this post, we’ll explore how a Pt1000 sensor works and take a look at its main applications.
More Details about Temperature Sensor Pt1000
Pt1000 is a resistance temperature sensor like the Pt100 but is made with a platinum component with a resistance of 1000 ohms. It has a 385-ohm fundamental interval which is basically a change in resistance over 0 to 100ºC.
Since Pt1000 has a higher resistance than the Pt100 sensors, it is suited for 2-wire applications as lead resistances are no longer a problem due to high initial resistance of the element. Pt1000 is used in various temperature measurement applications.
The Pt1000 sensor element is fitted inside a probe or metal sheath. This protects it against damages by the surrounding environment during insertion in the process for measuring. The other end is finished by two insulated wire tails connected to the temperature taking equipment.
What makes the Pt1000 different from Pt100?
There are several differences between the two RTD sensors. The very first is the resistance value at 0°C which is 1000Ω for Pt1000 and 100Ω for Pt100.
Also, the base resistance for the Pt1000 is ten times that of Pt100. The fundamental interval as well. In simple terms, the resistance change every degree centigrade for Pt1000 is ten times the one for Pt.
However, the accuracy of the Pt1000 is no worse than that of Pt100. It’s important to note that a class B Pt1000 has the same temperature resistance as the class B Pt100.
The Importance of Using Pt1000 and Pt100
Both Pt100 and Pt1000 are RTD temperature sensors mostly used since;
- They have high accuracy
- Are consistent
- They have high repeatability
- They provide long term stability
- They are good in extreme environments
- They can function in very high temperature
Pt1000 and Pt100 are designed in a robust make to function in different industrial applications. Some of the industrial applications include food processing, laboratories, plastics processing, exhaust gas temperature measurement, among others. The high tolerance makes the RTDs suitable in such industrial applications.
How a PRT Temperature Sensor Works
PRT temperature sensors work by inserting the process end in equipment that needs temperature measurement. As the temperature of your platinum resistance rises, its tolerance to electricity flow increases. The electrical tolerance changes by a certain set ratio known as the temperature coefficient for each rise per degree of temperature.
The ratio for platinum is .00385 ohm/ohm/°C. This means for the Pt1000, which has a 1000 ohm tolerance, tolerance increase per degree temperature may be 3.85 ohms. Therefore, the total tolerance reading may be measured and converted to temperature.
Using Pt1000 and Pt100
Pt100 and Pt1000 may be used in different instances. Since a Pt1000 has a higher resistance level, its distorting effect on tolerance in lead wires is less significant in general since it contributes to a smaller resistance or percentage compared to the circuit.
This makes the Pt1000 sensor suitable for applications in two-wire circuit configurations since the sensor provides less resistance and thereby less pressure on the wires.
On the other hand, Pt100 sensors are mainly used for three or four circuit applications. Because Pt100 sensors have less tolerance across the sensing property, the tolerance from lead wires will have a high distorting effect on the total resistance of the circuit.
In summary, it’s essential to know the aspects of every application when contemplating whether to use a Pt1000 sensor or a Pt100 sensor. If your application includes three or four wires, a Pt100 would be the best option as its characteristics seem to suit the application.
At the same time, every two-wire application should go with a Pt1000 sensor as it has the best and most favourable qualities for this application. Though they are all temperature sensors, their special features make them suitable for different industrial applications. You just need to know which and when to use.