Principle: EMCO thermowell type VSA, known as Van Stone type, is used for mechanical and corrosive protection of temperature sensing instruments such as bimetal thermometers, thermocouples, and RTD’s with a maximum outer diameter of 6.4 and 9.5 mm (1/4″and 3/8″).
The thermowell is sandwiched between a loose lap joint flange and the flanged nozzle (boss)
on the process equipment.
![VSA_Gevind_Main[1]](https://www.emcocontrols.com/wp-content/uploads/2022/05/VSA_Gevind_Main1.png)
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Material
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AISI 316, 22Cr Duplex, 25Cr Duplex, Monel, 6Mo, Titanium, Hastelloy, and other exotic materials on request
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Connection
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Between ANSI/ASME flanges
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Size
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1", 1 1/2", 2"
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Pressure rating
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150 lbs - 2500 lbs
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Flange facing
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RF with stock or smooth finish or RTJ
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Bore
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7, 10 mm (0.276", 0.394")
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Well form
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Straight, stepped straight, taper
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Tip thickness
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6.4 mm (0.25")
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Instrument connection
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½" NPSM. This thread accepts both NPT and NPS external threads
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Plug and chain
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Lap joint flange.
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Pt 100 and thermocouple temperature sensors
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Surface treatment possible (PTFE)
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