What is the difference between PT100 and PT1000 temperature sensor

Many industries use RTD temperature sensors to measure temperature. Most of the sensors in most devices are PT100 temperature sensors or PT1000. These two temperature sensors have similar characteristics, but the difference between their nominal resistance may determine which one you choose for the application.

resistor temperature detector (RTD), also known as resistance thermometer , because of its reliability, accuracy, multifunctional, repetitive and easy installation, Become a popular temperature measurement equipment.

RTD temperature sensor is its line sensor (made of metal with known resistance) changes its resistance as the temperature increases or decreases. Although the resistance thermometer has certain limitations, including the maximum measurement temperature of about 1,100 ° F (600 ° C), in general, they are ideal temperature measurement solutions suitable for multiple processes.

Why use platinum sensors
The sensor line in RTD temperature sensors can be made of nickel, copper or tungsten, but platinum (PT) is currently the most commonly used metal. It is more expensive than other materials, but there are several characteristics of platinum to make it particularly suitable for temperature measurement, including:

● Almost linear temperature-resistance relationship
● High resistivity (compared with 36 ω/cmf of nickel)

● Over -time non -degradable resistance
● Excellent stability
● Very good chemical passivation
● High anti -pollution

The difference between PT100 and PT1000 sensor
Among Platinum RTD temperature sensors, the most common is PT100 and PT1000. The nominal resistor of the PT100 sensor at the freezing point (0 ° C) is 100Ω. The nominal resistor of the PT1000 sensor at 0 ° C is 1,000Ω. The characteristic curve of the two is the same, the working temperature range and the response time are the same. The temperature coefficient of the resistance is also the same.

However, due to the different nominal resistors, the reading of the PT1000 temperature sensor is 10 times higher than the PT100 sensor. When comparing the 2 -line configuration, this difference becomes obvious, and the lead measurement error is applicable. For example, the measurement error of the PT100 temperature sensor may be +1.0 ° C, and in the same design, the measurement error of the PT1000 temperature sensor may be +0.1 ° C.

How to choose the right platinum temperature sensor
Both types of sensors are suitable for 3 and 4 configurations. Among them, additional wires and connectors compensate the effects of lead resistance on temperature measurement. The price of these two types is similar. However, the PT100 temperature sensor is more popular than the PT1000. The reason is as follows:

● PT100 temperature sensor adopts a winding and film structure to provide users with selection and flexibility . The PT1000 RTD temperature sensor almost always has only a thin film.

● Because the PT100 RTD temperature sensor is widely used in various industries, they are compatible with various instruments and processes .

So why would anyone choose the PT1000 temperature sensor? The following is a significant advantage of the larger nominal resistance:

● PT1000 Temperature sensor is better when using the length of the 2 -line configuration with a longer lead length . The less the number of wires, the longer the wire, the greater the resistance on the reading, which will cause inaccurate. PT1000 temperature sensor larger nominal resistors compensate these increasing errors.

● PT1000 temperature sensor is more suitable for battery power applications. A sensor with a higher standard is used for less current, so it requires less power to run. Small power consumption can extend the life of battery life and maintenance interval, and reduce the time and cost of the downtime.

● Because the PT1000 temperature sensor uses less power, it is less self -heating . This means that there are fewer reading errors due to higher environmental temperatures.
Generally speaking, the PT100 temperature temperature sensor is more common in process applications, while the PT1000 temperature sensor is used for cooling, heating, ventilation, automobiles and machine manufacturing applications.

Replace RTD temperature sensor: explanation of industrial standards
The RTD temperature sensor is easy to replace, but this is not a simple problem. The problem that users must pay attention to when replacing the existing PT100 and PT1000 sensors are regional or international standards.

Old international standards specify the temperature coefficient of platinum to 0.00392 ω/ω C (Ohm per degree of Celsius). In North America's newer European/IEC 60751 standard, the standard is 0.00385 ω/ω C. This difference can be ignored at a lower temperature, but it becomes obvious at the boiling point (100 ° C). The old standard reading is 139.2Ω, and the new standard reading is 138.5Ω.