Inline Tubular
In-pipe sight glass for visual inspection of flow, color and clarity.
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Sanitary Sight Glasses
Sight glasses for visual process verification in hygienic process lines and equipment packages.
Clamp and weld connection optionsStainless body and glass selection by requirementUseful for maintenance and project BOMsRFQ based on pressure/temp and media
Sizes & Dimensions
Sight glass configurations.
In-line tubular type for installation in pipework, or flanged tank-mounted type for vessel viewing. Borosilicate glass with 316L body.
| Nominal | DN | OD (mm) | Glass Dia (mm) | Length (mm) | Weight (kg) |
|---|---|---|---|---|---|
| ½" | DN15 | 50.5 | 25 | 80 | 0.6 |
| 1" | DN25 | 50.5 | 38 | 80 | 0.8 |
| 1½" | DN40 | 64.0 | 50 | 100 | 1.5 |
| 2" | DN50 | 77.5 | 63 | 120 | 2.4 |
| 2½" | DN65 | 91.0 | 80 | 140 | 3.5 |
| 3" | DN80 | 104.0 | 100 | 160 | 5.0 |
| 4" | DN100 | 119.0 | 125 | 180 | 7.5 |
Operating Conditions
Pressure-temperature rating for sanitary sight glasses.
Borosilicate glass is rated for moderate pressure and thermal shock. Avoid sudden temperature changes greater than 150°C.
Service Conditions
- Max working pressure: 10 bar
- Max test pressure: 15 bar
- Temperature range: –10°C to +180°C
- Thermal shock: Δ150°C max
- Glass material: Borosilicate 3.3
- Body material: 316L SS
Actual ratings depend on size, material and operating conditions. Confirm via RFQ for project-specific requirements.
Standards & Compliance
Built to recognized sanitary and pressure standards.
Full documentation packages available including MTR, 3.1 certificates, surface roughness reports and pressure test records.
3-A 09-11
3-A Sight Glasses
Sanitary sight glasses and fittings standard.
DIN 7080
Round Sight Glasses
German standard for round sight glasses.
DIN 8902
Toughened Glasses
German standard for toughened sight glasses.
EHEDG
Hygienic Equipment Design
European hygienic engineering and design certification.
FDA 21 CFR
FDA 21 CFR 177
Food contact materials compliance for seats and seals.
EC 1935/2004
Food Contact
EU regulation on food-contact materials.
Product Variants
Sight Glass configurations for different process roles.
Multiple variants available to match your application requirements. Browse related products for complete process line coverage.
With Illumination
Integrated LED light (24V DC) for enhanced viewing in dark process.
Request quote →Technical Datasheet
Download the product-specific RFQ datasheet.
This PDF summarizes typical sizes, materials, standards, application notes and RFQ inputs for Sight Glasses. Use it as a preparation document before sending a quotation request.
Engineer / Contractor RFQ Support
Send this item as part of a project package, BOM or comparison quote.
For accurate sourcing, include size, connection type, material grade, finish, quantity, pressure/temperature conditions, certificates required and target delivery timing.
Technical RFQ Guide
Specification points to confirm before quotation.
These are typical sourcing fields. Final availability and compliance should be confirmed against the exact project requirement.
Type
Inline sight glass, tank sight glass or custom requirement
Material
304 / 316L stainless body options
Glass
Borosilicate/tempered options by requirement
Connection
Tri-clamp, weld or threaded options
Rating
Pressure/temperature by RFQ
Seal
EPDM, silicone, FKM, PTFE options
Applications
Where this product is typically used.
Process line visibility
Relevant for sourcing discussions, project BOMs and maintenance replacement needs.
Tank and skid inspection points
Relevant for sourcing discussions, project BOMs and maintenance replacement needs.
Food and beverage transfer systems
Relevant for sourcing discussions, project BOMs and maintenance replacement needs.
CIP/process monitoring
Relevant for sourcing discussions, project BOMs and maintenance replacement needs.
Related Products
Continue building the RFQ package.
Technical Product Layout
Sanitary Sight Glasses — technical sourcing profile
Structured for engineers, contractors and plant buyers who need a clear RFQ-ready technical view before requesting pricing.
Technical Overview
Sanitary sight glasses for visual inspection of product flow, CIP status and process condition in hygienic systems.
Applications
- Flow verification
- CIP observation points
- Tank and skid inspection
- Process troubleshooting
Material Grades
- Stainless steel body
- Glass / borosilicate viewing element by requirement
- Seal material by process media
- Clamp or weld connection options
Surface Finish
Sanitary polished body surfaces with cleanable inspection design.
Standards
- 3-A sanitary design discussion
- FDA-oriented seals
- Process visibility requirements
- Pressure rating by design
Pressure / TemperaturePressure and temperature depend on glass type, seal, body design and connection.
Connection TypesCommon RFQ connection formats are listed below. Final connection selection depends on plant standards and equipment interface.
Tri-ClampWeld endInline or tank-mounted stylesCustom inspection ports
Related Products
Use these products to build a complete RFQ package around this item.
RFQ note: Values on this page are sourcing guidance only. Final model, pressure rating, temperature rating, certificates, elastomer compatibility and compliance must be confirmed against the exact supplier datasheet and project requirement.
Contractor & Plant Buyer RFQ
Need a contractor-ready quote package or BOM support?
Send line sizes, connection standards, material grade, finish, quantity, photos/drawings and required delivery timing. We help turn unclear product needs into a cleaner RFQ package for supplier comparison.
Common Questions
Frequently asked questions about sanitary sight glasses.
Engineering and procurement questions we hear most often. For project-specific guidance, send your application details via RFQ.
What is sight glass used for?
Visual confirmation of process flow, fluid level, foam formation, color changes, particulate presence, and CIP cycle progress.
Strategic placement: after pumps to confirm priming, on tank outlets, on CIP return lines, after filters, and at sample points.
How fragile is borosilicate glass?
Borosilicate is durable but can break from thermal shock (>150°C change) or excessive bolt torque. Standard pressure rating provides good safety margin.
Always inspect for cracks/chips on assembly. Use cushion gasket (PTFE) between glass and metal. Tighten bolts gradually in cross pattern to specified torque.
Can sight glasses handle steam?
For SIP cycles, gradual warm-up required (no rapid steam injection). Standard sight glasses rated for 180°C continuous, 200°C peak.
For frequent SIP, specify toughened glass (DIN 8902) for better thermal shock resistance. Provide cycle temperature/frequency for selection.
What thermal shock limit applies?
Standard borosilicate: 150°C temperature change. Toughened: 250°C change. Exceeding these limits causes thermal stress fracture.
For CIP/SIP cycles, control temperature ramp rates. Pre-warm system before introducing hot CIP solutions.
Are there options with LED lighting?
Yes — integrated LED illumination (24V DC) available for enhanced viewing in dark processes or for video monitoring.
IP65/IP67 rated for washdown environments. ATEX-certified options for hazardous areas. Provide voltage and certification needs with RFQ.
What is the wiper option?
A mechanical wiper inside the sight glass clears product film/deposits for clear viewing. Useful for viscous, opaque or filming media.
Wiper operated manually via external knob. Constructed of PTFE or silicone for hygienic compatibility. Specify wiper material based on media.
What documentation is provided?
Standard: 3.1 MTR for body, glass certification, FDA compliance for seals, pressure test certificate.
Optional: thermal cycle test report, ATEX certification (LED option), full BPE package for pharmaceutical applications.