3-A Sanitary RTD Probes with Class A Accuracy - Diameter: 9,6 to 4,8 mm (3/8" to 3/16"), Lenght: 7,5 cm (3"), Process connection size: 2", Process connection type: Tri-Clamp
3-A Approved Design, Along with ASME-BPE-2007 Flange Geometry, Insures Trouble-Free Cleanability and Interchangeability. Pt100 Sensor Can Be Used in Sanitary, Hygienic and Clean-In-Place Food, Dairy, Beverage and BioPharmaceutical Processes. Wetted Surfaces are 316L Stainless Steel, Surface Finish = 32 Microinch or Better. Standard Duty ¼" (0.250") Diameter or Heavy Duty Stepped 3⁄8" to 3⁄16" Diameter Probes Available. 4-Wire, Pt100, Class A Platinum RTD Sensor (100.00 ±0.06 Ω at 0°C) Standard. Process Measurement Temperature Range: -50 to 200°C (-58 to 392°F). Compatible with 3-Wire and 2-Wire RTD Instruments & Transmitters. More
The 3-A Approved OMEGA™ PRS-S-NB9W and PRS-H-NB9W Series RTD Sensors (Pt100) are designed for use in Sanitary or Hygienic Clean-in-Place applications in the Food, Dairy, Beverage and BioPharmaceutical industries. These sensors are manufactured with 316L stainless steel housings that meet the dimensional and finish requirements of 3-A Standard 74-05 and ASME BPE-2007, and are welded and processed to provide a clean, smooth, 32 microinch or better surface finish in the wetted areas for Clean-in-Place processes.
The Pt100 probe stems are manufactured in two configurations; with a standard 1/4" diameter probe for standard duty service, and a stepped 3/8" to 3/16" diameter probe design for good response times in heavy duty applications. A white polypropylene connection head provides a convenient 3/4' NPT threaded connection point for process wiring.
Food process hygienic Pt100 temperature sensors can be used to aid food safety inspection compliance and verification of time temperature control. Combined with a chart recorder model CTXL you can temperature monitor a CCP ( Critical Control Point) or sanitation time and move toward a HACCP (Hazard Analysis Critical Control Point) compliance plan.
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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...
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