LUMIGLAS® LSQ-075-B Brass Observation Port
LUMIGLAS® LSQ-075-B — 3/4″ NPT brass observation port rated to 50 PSI & 500°F. Precision-machined CW614N body, standard glass lens. Ideal for HVAC, water treatment & food processing lines.
Description
The LUMIGLAS® LSQ-075-B Observation Port is the entry-level model of the LSQ-075 series — a compact, 3/4″ NPT inline sight glass fitting precision-machined from free-cutting brass (CW614N / C36000). Designed for general-purpose visual inspection of pipelines and process equipment under standard service conditions, it delivers reliable optical clarity at a cost-effective price point for ambient and low-temperature applications.
The standard LUMIGLAS® glass lens provides clear, undistorted visibility for routine flow monitoring, level confirmation, and fluid colour inspection. With a maximum operating pressure of 50 PSI (3.45 bar) and a temperature rating of 500°F / 260°C, the LSQ-075-B is the specified choice for water treatment, HVAC, food processing, and light industrial process lines.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LSQ-075-B |
| Series | LSQ-075 | Observation Port |
| Body Material | Brass (CW614N / C36000) |
| Sight Glass Material | Standard Glass (LUMIGLAS®) |
| Pipe Connection (NPT) | 3/4″ |
| Max. Outer Diameter | 1-1/4″ (31.8 mm) |
| Protrusion Length | 5/8″ (15.9 mm) |
| Overall Length | 1-1/8″ (28.6 mm) |
| Weight | 0.11 kg (0.24 lb) |
| Max. Operating Pressure | 50 PSI (3.45 bar) |
| Max. Operating Temperature | 500°F / 260°C |
| Applicable Standard | Custom engineered — ANSI B16.5 reference |
| Certifications / Notes | General-purpose visual inspection, standard service |
Why Specify the LSQ-075-B Brass Observation Port?
The LSQ-075-B addresses a common specification gap in general-purpose process systems: the need for a compact, threaded inline observation port that installs directly onto standard 3/4″ NPT pipe without additional fittings, spacers, or custom machining. Its precision-machined brass body delivers dimensional consistency and thread integrity across production batches, ensuring leak-free seating in both new installations and retrofit applications.
The LUMIGLAS® standard glass lens is optically clear and thermally stable to 260°C — more than adequate for water, steam condensate, compressed air, food-grade liquids, and general chemical service under ambient conditions.
For elevated-temperature or corrosion-critical service, the LSQ-075-S (SS316 / Borosilicate) and LSQ-075-M400 (Monel® / Fused Quartz) variants are available within the same series.
3/4″ NPT Direct-Thread
Installs directly onto standard 3/4″ NPT pipe. No adapter, coupling, or custom machining required.
CW614N / C36000 Brass Body
Free-cutting brass alloy with excellent machinability, corrosion resistance, and dimensional stability over service life.
500°F / 260°C Rated
Thermally rated for steam condensate, hot water, and process fluid lines well within standard HVAC and industrial service.
ANSI B16.5 Reference
Custom-engineered to ANSI B16.5 dimensional reference — suitable for documentation in process plant engineering packages.
Dimensional Reference
All dimensions in Imperial (inch) with SI equivalents in parentheses.
| Pipe Connection | Max. Outer Dia. | Protrusion Length | Overall Length |
|---|---|---|---|
| 3/4″ NPT | 1-1/4″ (31.8 mm) | 5/8″ (15.9 mm) | 1-1/8″ (28.6 mm) |
Typical Applications
The LSQ-075-B is specified for general industrial and light-process applications where direct inline visual confirmation of flow, fluid colour, or liquid level is required without the cost overhead of high-grade alloy bodies.
- ▸
Water treatment plants — pipeline flow monitoring and chemical dosing line visual confirmation - ▸
HVAC systems — chilled water, heating hot water, and glycol loop observation ports - ▸
Food & beverage processing — ambient-condition production lines requiring inline visual inspection - ▸
Compressed air & pneumatic lines — low-pressure observation of air quality and oil carry-over - ▸
Storage & transfer systems — liquid level and fluid colour inspection in tanks and transfer lines - ▸
Laboratory & light industrial equipment — inline visual confirmation for benchtop process rigs and test systems
Installation & Safety Notes
- !
Install without applying thrust, bending, or torsional stress directly to the sight glass lens. - !
Ensure proper pipe alignment before final tightening — misalignment imposes bending loads that may fracture the lens. - !
Use PTFE thread tape or a brass-compatible pipe thread sealant on NPT threads. Do not use steel-cutting compounds. - !
Do not exceed rated operating pressure (50 PSI / 3.45 bar) or temperature (500°F / 260°C) under any operating condition. - !
For replacement lenses, stainless steel upgrade (LSQ-075-S), or extreme-temperature Monel® variant (LSQ-075-M400), contact Lumistar technical sales.
LSQ-075 Series — Full Model Comparison
The LSQ-075 series spans three specification grades — from general-purpose brass to extreme-environment Monel®.
The LSQ-075-M400 is the flagship model, rated to 1832°F / 1000°C with a fused quartz lens for furnace, kiln, and high-temperature reactor observation.
| Model | Body Material | Glass Type | Max. Temp. | Max. Press. | Grade |
|---|---|---|---|---|---|
| LSQ-075-B | Brass (CW614N / C36000) | Standard Glass (LUMIGLAS®) | 500°F / 260°C | 50 PSI | Standard ← You are here |
| LSQ-075-S | SS316 | Borosilicate (LUMIGLAS®) | 1000°F / 538°C | 50 PSI | Industrial |
| LSQ-075-M400 ★ | Monel® 400 | Fused Quartz | 1832°F / 1000°C | 50 PSI | ★ Flagship |
Custom materials, special lengths, and ANSI-flanged configurations are available on request. Please specify model number when ordering.
Request a Quote — LUMIGLAS® LSQ-075-B Observation Port
3/4″ NPT Brass · Standard Glass · ANSI B16.5 Reference · OEM & Project Volumes Welcome
