instant visual oil inspection up to 232°C
Stop guessing. Start seeing. The High Temperature Oil Sight Glass gives you a crystal clear 360° view of your oil condition even in extreme operating environments. Detect contamination early, drain free water instantly, and protect your equipment from costly downtime.
Built for harsh industrial conditions. Designed for engineers who demand reliability.
Modern rotating equipment fails silently. Water ingress, sediment buildup and oil degradation often go unnoticed until catastrophic damage occurs. This high temperature oil sight glass lets you spot issues immediately, without shutting down production.
You gain:
All in one compact, easy to install unit.
Engineered for extreme heat and pressure
Developed for applications where standard sight glasses fail, this model operates safely from minus 40°C up to 232°C and handles pressures up to 225 psi.
Ideal for:
• Pumps
• Gearboxes
• Storage tanks
• Fluid lubricated machinery
• High heat industrial environments
Key construction features:
• Heavy walled Pyrex glass for stain resistance and clarity
• Teflon end plates for thermal stability
• Viton O rings for chemical resistance
• Stainless steel bolts and hardware
• Brass fittings as standard with stainless options available
• Integrated drain valve for removing collected water
• Optional magnetic drain for capturing ferrous particles
This is not just a viewing window. It is a frontline defence against oil contamination.
Water is one of the leading causes of lubricant breakdown and bearing damage. This sight glass isolates free flowing water at the lowest point of your reservoir, allowing you to drain it before it circulates through your system.
At the same time, the clear chamber gives you immediate insight into:
• Oil colour changes
• Sediment presence
• Foam formation
• Free water accumulation
It becomes your early warning system for contamination, oxidation and wear.
Used correctly, it forms part of a best practice predictive maintenance strategy alongside filtration, breathers and oil analysis.
Thousands of installations worldwide help engineers:
Operating temperature: - 40°C to 232°C (- 40°F to 450°F)
Pressure rating: up to 225 psi
Standard size:
3 oz with 1/2" NPT port (options: 1/4" NPT and 4/8" NPT)
Materials: Pyrex glass, Teflon caps, Viton O rings, stainless steel fasteners
Compatible with: mineral, synthetic and gear oils
Overall length: 6.35 cm (2.5 inch)
Outside diameter: 8.89 cm (3.50 inch)
No. The sight glass removes free flowing water and provides visual inspection. Filtration is still required to remove emulsified moisture and fine particulates.
Yes. It works with mineral, synthetic and gear oils. High quality synthetics typically separate water more effectively.
Yes. Breathable systems prevent moisture ingress. The sight glass removes water already present. Used together they provide maximum protection.
Samples taken here may appear dirtier as contaminants settle at the bottom. For accurate analysis, draw samples from the centre of the reservoir.
The Pyrex glass is heavy walled and impact resistant. For added safety, install it in a protected location and consider a ball valve for isolation.
Yes. Installing a ball valve allows you to isolate the unit for cleaning or replacement using simple soap and water.
Stop reacting to failures. Start preventing them.
Upgrade your maintenance strategy today with a high temperature oil sight glass built for real world industrial conditions.