Butt-Weld Tubular Sight Glass with Perforated Mesh Guard

An inline sanitary tubular sight glass featuring butt-weld process ends, a replaceable tempered glass viewing cylinder, and a perforated stainless steel mesh guard cover. Offered in SS304 and SS316L across 1/2"–4".

Body & Guard Material	SS304 / SS316L (AISI 304 / AISI 316L Sleeve)
End Connection	Butt-Weld Ends
Body Construction	Tubular Sight Glass with Perforated Mesh Guard & Stainless Steel Fasteners
Nominal Size Range	1/2"–4" (1/2", 3/4", 1", 1.5", 2", 2.5", 3", 4")
Referenced Drawing Standards	DIN, Inch (3A / SMS)

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Butt-Weld Process Ends and Perforated Stainless Mesh Cover

This inline tubular sight glass combines butt-weld tube ends with a cylindrical perforated AISI 304/316L stainless steel protection cover around the replaceable tempered glass cylinder. The perforated grid shields the glass tube from accidental external impact while maintaining 360-degree visual monitoring of line flow and clarity.

Size Range and Catalog Drawing Note

The specification table lists nominal sizes 1/2", 3/4", 1", 1.5", 2", 2.5", 3", and 4". Note that the embedded catalog sheet in the series documentation shows No.50039 Straight Clamped Sight Glass (DIN, DN20–DN150) and No.50040 Straight Clamped Sight Glass (1"–6"), which illustrate Type A (with protective net) versus Type B (without net) rather than weld-end spigots.

Material Grades and Elastomer Seals

End fittings are CNC-lathed from SS304 or SS316L stainless steel with full stainless steel fasteners and VMQ (silicone), EPDM, Viton, or PTFE gaskets (source-claimed tempered glass rating up to 10 bar) for food, dairy, beverage, meat processing, vacuum, pharmaceutical, and chemical service.

Pre-Weld Disassembly and Ordering Guidance

Disassemble the sight glass housing and remove the tempered glass cylinder and gaskets prior to welding the end spigots into the pipeline, reassembling only after the welds cool. Specify tube OD standard and any required heat numbers or MTR certificates when ordering.