Pt100 for Industrial, airsteam and laboratory Applications
Item# (PN): P-Ultra-RTD Shipping and Payment
100 Ohm DIN Platinum RTDs with Class “A”, 1/3 DIN and 1/10 DIN Accuracies. Pt100 Available in Two Models: Standard Closed End Sensor for Immersion Applcations. Air/Gas Measurement Sensors with Open Ends and Vent Holes. Pt100 Probes Available in 6 mm, 3 mm Diameters. 4-Wire Construction. Both Pt100 Models are Available As Straight Sheaths or With The Followng Mounting Threads: 1/8, 1/4, 3/8 and 1/2NPT and 6 mm, 8 mm and 10 mm Sizes. More
Omega's line of Ultra-Precise RTD Pt100 temperature sensors provide customers with a product that offers sensor accuracies that are far tighter than are available in most standard RTD sensors on the market today. These Pt100 sensors are manufactured using DIN Platinum RTD elements (temperature coefficient = .00385 ohm/ohm/°C) with Class A, Class 1/3DIN or Class 1/10DIN accuracies. This makes Omega's Ultra-Precise RTDs among the most accurate industrial temperature sensors available.
These sensors are available in two styles:
- Type P-M style closed ended immersion Pt100 sensors for use where the sensors will be immersed in a fluid.
- Type P-L style exposed element Pt100 sensors for use in direct contact with air or gasses for more accurate measurement of these substances.
There are four Pt100 probe diameters available including 3mm, 6mm, 1/8" and 1/4", with lengths starting at 25 mm (1") with a number of standard lengths available (see ordering table below). A variety of mounting threads are available including: 6x1mm, 8x1mm, 10x1mm, 1/8NPT, 1/4NPT, 3/8NPT and 1/2NPT (Note: 6mm mounting threads are not available on 6mm diameter probes).
Please note that 1/8" and 3mm diameter Pt100 probes without threaded fittings and with "-P", "-PS", "-TS", "-GS" and "-S" cables include a transition fitting at the end of the sheath to accommodate the cable diameter. If a transition fitting is not acceptable, then a type "-T" or "-G" cable must be specified.
Please note that the minimum recommended length for 1/10DIN accuracy Pt100 probes is 6” for 1/4" (150mm for 6mm) diameter probes, and 4” for 1/8” (100mm for 3mm) diameter probes. This is due to the fact that in order to achieve these accuracies all stem conduction effects in the sensor must be eliminated. Also, please note that in order to lab certify 1/10DIN accuracy RTDs, it may be necessary for the Pt100 probes to be longer than these lengths depending on the test equipment used to perform the certification. Omega can make these products shorter than the recommended lengths, but we cannot guarantee their performance. For 1/3DIN Pt100 probes, a minimum length of 4.75" applies for 1/4" (120mm for 6mm) probes and 2.38" for 1/8" (60mm for 3mm) diameter probes.
The ultimate temperature range of the Pt100 sensor is dependent upon both the element accuracy and cable selection as shown below (the tightest temperature range applies):
Temperature Range Examples:
P-M-A-1/8-6-0-T-3 has a Class A Pt100 Element = -100 to 450°C, and "T" (PFA) Cable = -100 to 250°C, resulting in a sensor temperature range of -100 TO 250°C.
P-M-1/10-1/4-9-1/2-P-3 has a 1/10DIN Pt100 Element = 0 to 100°C, and a P (PVC) Cable = -29 to 100°C, resulting in a sensor temperature range of 0 to 100°C.
The online configurator may not contain all available options. If you do not find what you are looking for, please contact us.
Complete informations can be found in the spec sheet (PDF), see the "Download" section.
RTD Pt100 vs Thermocouple
It is not practical to compare RTDs (Pt100 and others) and thermocouples generally. However, if we compare their performance in terms of specific criteria, we can see which is best suited for specific applications. Thermocouples are best for working at high temperatures. New manufacturing techniques have improved the measurement range of RTD probes, but more than 90% of RTDs are designed for temperatures below 400°C.
In contrast, some thermocouples can be used at up to 2500°C. Thermocouples are generally cheaper than RTDs...
Origin Story of the RTD / Pt100
The same year (1821) that Thomas Seebeck made his discovery about thermoelectricity (Seebeck effect, see thermocouples), Sir Humphrey Davy announced that the resistivity of metals showed a marked temperature dependence. Fifty years later, Sir William Siemens proffered the use of platinum as the element in a resistance thermometer. His choice proved most propitious, as platinum is used to this day as the primary element in all high-accuracy resistance thermometers, Pt100, Pt1000 etc.
In fact, the Platinum Resistance Temperature Detector, or RTD Pt100, is used today as an interpolation standard from the oxygen point (-182.96°C) to the antimony point (630.74°C)...
What are RTD temperature sensors?
RTDs or Resistance Temperature Detectors, are temperature sensors that contain a resistor that changes resistance value as its temperature changes. The most popular RTD is the Pt100. They have been used for many years to measure temperature in laboratory and industrial processes, and have developed a reputation for accuracy, repeatability, and stability.
Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it...
Differences Between 2, 3, and 4-Wire RTDs
Resistance Temperature Devices (RTDs) are widely used in industrial and commercial applications due to their accuracy and stability. However, RTD wire configuration can significantly impact measurement precision. Selecting the right configuration ensures optimal performance, minimizes errors, and enhances system reliability.
RTDs are typically manufactured in three different wiring configurations: 2-wire, 3-wire, and 4-wire. Each configuration is designed to compensate for lead wire resistance to varying degrees, impacting measurement accuracy. The 2-wire setup is the simplest but most susceptible to errors...
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