Quartz-Sheath SPORTs Fluke 5683-S Fluke Vietnam
Price: Contact
Brand: Fluke Process Instruments Vietnam
Category: 4.0 Industry
Supplier: ansvietnam
Origin: Germany
0911472255Quartz-Sheath SPORTs Fluke 5683-S Fluke Vietnam
Fluke Calibration has four quartz-sheath SPRTs covering the ITS-90 range of –200 °C to 1070 °C. The 5681 is used from –200 °C to the aluminum point at 660.323 °C. The 5683 is used from –200 °C to 480 °C with greater long term stability. The 5684 covers higher temperatures up to 1070 °C and can be calibrated at the silver point.
Yes, they have all the features you would expect in a world-class SPRT. They have gold-plated spade lugs, a strain-relieved connection to the four-wire cable, convection prevention disks, the finest quartz glass available, delustered stems, and the purest platinum wire available.
The purity of a thermometer’s platinum wire is critical to meeting ITS-90 requirements. Maintaining that purity over the life of the thermometer impacts long-term stability. The quartz glass tube of the SPRT should be properly sealed to prevent contamination of the platinum sensor. Others use mechanical assemblies and epoxy seals. These introduce additional materials to the thermometer’s internal environment and can be prone to mechanical failure, risking exposure of the platinum to impurities.
Theoretically, the best seal would be a direct seal between the quartz glass and the platinum wire. However, the quartz glass used in thermometer sheaths has a very small coefficient of expansion while platinum has a much larger coefficient of expansion. If you simply sealed the sheath’s glass to the platinum wire, these different rates of expansion would result in a poor seal as the assembly is exposed to changing temperatures.
