What is gauge glass used for?
Table of Contents
What is gauge glass used for?
A glass tube or arrangement of glass plates fitted to a gauge used to give a visual indication of the level of liquid in a tank, pressure vessel, or boiler.
What is a sight glass used for in HVAC?
A sight glass is commonly installed in the liquid line of systems that use a thermostatic expansion valve (TXV) metering device, and it allows technicians to view the condition of the refrigerant at the point where it is installed.
What is the function of sight glass MCQS?
Use of a sight glass is probably the simplest method of measuring liquid level. The sight glass is attached to the outside of the tank so that the liquid level can be seen through the glass. The sight glass is marked with graduations to allow the level to be measured.
What are the 3 types of sight glass?
Types of Sight Glass
- Bullseye. A bullseye sight glass is installed by drilling a hole in a tank at the top of the optimum oil level.
- Columnar. These are clear, vertical tubes mounted outside tanks that allow you to see a larger sample of oil than bullseye sight glasses.
- BS&W Bowls.
- 3D.
- Multifunctional.
Where do you put sight glass?
In a system with an expansion valve, a sight glass is usually fitted in the liquid line immediately after the filter drier.In theory, the sight glass can be fitted at any desired location on the liquid line. However, placing it close to the expansion valve is especially advisable.
How much water should be in the sight glass?
The proper water level in a boiler sight glass should show that the tank is at least half full, but not more than three-quarters full.
How do sight gauges work?
If higher pressure vessels require sight gauges, an assembly that combines very thick glass and steel reinforcement is used. Because the pressure inside of the gauge is the same as pressure inside the vessel, the ball remains in place and allows liquid to pass.
How do you use a sight glass?
Correct field technique when using a sight glass is to:
- Block the glass from the service.
- Drain the glass.
- Open the bottom block.
- Open the top block and let the sight glass fill from the bottom.
- Observe sight glass conditions.
How many different gauges of glass are there?
Types of Level Gauge: There are commonly 3 types of level gauges used: Reflex level gauge. Transparent level gauge. Magnetic type level gauge.