The Non-Instrusive Tank Sensor is a 100 O, Platinum RTD sensing element. This sensor assembly is constructed of 316 stainless steel and supplied with a Silicone/Teflon® O-ring seal. All wetted parts are supplied with a surface finish that meets or exceeds 32 µin Ra. Surface finishes of 15 µin Ra or better are available upon request. This sensor has an operating temperature of (-40 to 204) ºC [-40 to 400] ºF.