Sight Glass Tube: Temperature Range -20°C to 200°C

Component Specifications

Definition

A sight glass tube is a transparent cylindrical component installed on industrial vessels, tanks, or pipelines to provide direct visual observation of liquid levels, fluid color, clarity, and flow conditions. It serves as a simple, reliable monitoring device without requiring electrical power or complex instrumentation.

Working Principle

Operates on the principle of communicating vessels - the liquid level inside the tube matches the level in the connected vessel due to hydrostatic pressure equilibrium. The transparent material allows light transmission for visual inspection.

Materials

Borosilicate glass (temperature resistant), tempered glass, acrylic/polycarbonate (for lower pressure/temperature applications), with stainless steel (304/316) or brass end fittings.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	100-2000 mm
Diameter	10-100 mm
Connection Type	Flanged, threaded, or clamped ends
Pressure Rating	Up to 10 bar
Temperature Range	-20°C to 200°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 3585, DIN 7080, DIN 7081

Parent Products

This component is used in the following industrial products

Level Indicators

Devices that visually or electronically display the liquid level inside a steam drum.

View Product Details

Engineering Analysis

Risks & Mitigation

Glass breakage from thermal shock
Chemical corrosion
Mechanical impact damage
Fogging/condensation obstructing view

FMEA Triads

Trigger: Thermal stress from rapid temperature changes
Failure: Cracking or shattering of glass tube
Mitigation: Use borosilicate glass, install thermal shields, implement gradual temperature changes

Trigger: Chemical incompatibility
Failure: Corrosion or etching of glass surface
Mitigation: Select appropriate glass grade, use protective coatings, regular inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1 mm for diameter, ±2 mm for length

Test Method

Hydrostatic pressure testing, visual inspection for defects, dimensional verification

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Sight Glass Tube

Manufacturer profiles associated with Sight Glass Tube.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What are the main applications of sight glass tubes?

Used in chemical processing, pharmaceutical manufacturing, food and beverage production, water treatment, and HVAC systems for monitoring liquid levels in tanks, reactors, and pipelines.

How do you maintain a sight glass tube?

Regular cleaning to prevent fouling, inspection for cracks or scratches, checking gaskets and seals for leaks, and ensuring proper alignment during installation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Sight Glass Tube