{"id":11803,"date":"2026-04-24T11:20:54","date_gmt":"2026-04-24T09:20:54","guid":{"rendered":"https:\/\/lubeteam.it\/prodotto\/miselli-oil-level-sight-glass-sm-hp-series-and-series-38\/"},"modified":"2026-05-04T15:38:47","modified_gmt":"2026-05-04T13:38:47","slug":"miselli-oil-level-sight-glass-sm-hp-series-and-series-38","status":"publish","type":"product","link":"https:\/\/lubeteam.it\/en\/product\/miselli-oil-level-sight-glass-sm-hp-series-and-series-38\/","title":{"rendered":"Miselli Oil Level Sight Glass \u2013 SM\/HP Series and Series 38"},"content":{"rendered":"

Miselli SM\/HP Series and Series 38 Oil Level Sight Glass: Reliability for Hydraulics<\/strong><\/h3>\n

The Miselli SM\/HP Series and Series 38 Oil Level Sight Glass represents a high-quality solution for visual monitoring of fluids in hydraulic systems. Manufactured by Miselli, a company with over 50 years of experience in innovation and reliability, these sight glasses are designed to meet the most demanding technical requirements.<\/p>\n

SM\/HP Series: Construction Features and Performance<\/strong><\/h3>\n

The SM\/HP series features a hexagonal head with threaded connection, entirely made of 11S aluminum alloy. Fluid monitoring is carried out through a natural glass window, sealed with an internal FKM VITON O-ring to ensure maximum tightness. To optimize visibility, an internal contrast screen made of white-painted aluminum is integrated, enhanced by a central red marker. External sealing is provided by a flat inorganic fiber gasket, with the option of an aluminum version depending on system requirements.<\/p>\n

In terms of performance, this series supports a maximum recommended working pressure of 20 bar and temperatures up to +130\u00b0C (266\u00b0F). Variants are available with BSP threads from G1\/2 to G1 (models SM-12\/HP, SM-34\/HP, SM-1\/HP) as well as metric versions M20x1.5 and M33x1.5 (models SM-20.15\/HP, SM-33.15\/HP).<\/p>\n

Series 38: Special Oil Sight Glasses for Extreme Conditions<\/strong><\/h3>\n

The Series 38 includes special models designed to withstand demanding thermal and pressure ranges, all rated for operating temperatures between -10\u00b0C and 150\u00b0C. This range is divided into four main construction variants:<\/p>\n

    \n
  • Model 38B<\/strong>: Made of brass and glass, capable of withstanding pressures above 40 bar, available with threads from G 1\/2″ to 2″.<\/li>\n
  • Model 38B.1<\/strong>: Made of stainless steel and glass, offering the same pressure performance (>40 bar) with threads from G 1\/2″ to 1″.<\/li>\n
  • Model 38D<\/strong>: Combines aluminum and glass for pressures above 10 bar, with a wide range of BSP (from 1\/2″ to 1 1\/2″) and metric threads (from M14 to M22x1.5).<\/li>\n
  • Model 38D.1<\/strong>: Stainless steel and glass version for pressures above 10 bar, with threads from G 1\/4″ to 1″.<\/li>\n<\/ul>\n

    Applications and Industries<\/strong><\/h3>\n

    The use of these level indicators is highly recommended for installation on industrial compressors. More broadly, they are an optimal choice for any application requiring very high mechanical and thermal resistance.<\/p>\n

    Technical Summary Table<\/h3>\n

    Summary of the main characteristics of the Miselli SM\/HP Series and Series 38 Oil Level Sight Glass.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Feature<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    Body material (SM\/HP Series)<\/td>\n11S aluminum alloy<\/td>\n<\/tr>\n
    Viewing window<\/td>\nNatural glass<\/td>\n<\/tr>\n
    Internal O-ring (SM\/HP Series)<\/td>\nFKM VITON<\/td>\n<\/tr>\n
    Max temperature (SM\/HP Series)<\/td>\n+130\u00b0C \/ 266\u00b0F<\/td>\n<\/tr>\n
    Max recommended pressure (SM\/HP Series)<\/td>\n20 bar<\/td>\n<\/tr>\n
    Materials Series 38B \/ 38B.1<\/td>\nBrass-glass \/ Stainless steel-glass<\/td>\n<\/tr>\n
    Materials Series 38D \/ 38D.1<\/td>\nAluminum-glass \/ Stainless steel-glass<\/td>\n<\/tr>\n
    Operating temperature (Series 38)<\/td>\n-10\u00b0C to 150\u00b0C<\/td>\n<\/tr>\n
    Operating pressure (38B \/ 38B.1)<\/td>\n> 40 bar<\/td>\n<\/tr>\n
    Operating pressure (38D \/ 38D.1)<\/td>\n> 10 bar<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    Designed to ensure maximum reliability in industrial environments, the Miselli SM\/HP Series and Series 38 Oil Level Sight Glass delivers excellent performance for hydraulic components. The SM\/HP Series, made of 11S aluminum with FKM VITON O-ring, is ideal for pressures up to 20 bar and temperatures up to 130\u00b0C. The Series 38 includes brass, aluminum, and stainless steel variants capable of withstanding extreme conditions up to 150\u00b0C and over 40 bar. An essential technical solution for visual fluid monitoring.<\/p>\n","protected":false},"featured_media":11484,"template":"","meta":[],"product_brand":[],"product_cat":[98,449],"product_tag":[258],"class_list":{"0":"post-11803","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-accessories-for-hydraulic-power-units","7":"product_cat-oil-level-indicators","8":"product_tag-miselli","10":"first","11":"instock","12":"shipping-taxable","13":"product-type-simple"},"yoast_head":"\nMiselli Oil Level Sight Glass \u2013 SM\/HP Series and Series 38 \u2013 LubeTeam Hydraulic<\/title>\n<meta name=\"description\" content=\"Miselli SM\/HP Series and Series 38 Oil Level Sight Glass for hydraulic applications. 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