Transparent Level Gauge
Transparent Level Gauge is used to visually observe the liquid level inside tanks and vessels. It consists of two transparent glass plates between which the fluid flows, allowing clear level indication. In some applications like water or steam, external lighting is used to improve visibility. This type of level gauge is suitable for applications where liquid color or interface between two liquids needs to be observed. It can also be used with mica or PTFE shields to protect the glass from corrosive fluids. Transparent level gauges are widely used in process industries for accurate and clear level monitoring.
Transparent Level Gauge
Code: TLG-FL, Model: NA
Product Details
Working Principle
Apart from glass tube level gauges, transparent level gauges are always fitted with two plate transparent glasses between which the fluid is contained. The fluid level is indicated as the result of the different transparency of the two media and in some cases (for water steam), by conveying upwards on to the surface of separation (between liquid and gaseous substances) a source of light located at the back of the gauge, the rays of which are totally reflected down to the observer.
Specifications
| Type | Transparent Level Gauge |
| Glass Type | Toughened Transparent Glass (Borosilicate – Klinger / Maxos / Equivalent) |
| Number of Glasses | Two Plate Glass (Front & Back) |
| Material of Construction (Body) | Carbon Steel / SS 304 / SS 316 / PP / PTFE |
| Cover Plate Material | CS (ASTM A-105) / SS |
| Mica / PTFE Shield | Optional (for corrosive / steam applications) |
| Valve Type / Design | Ball Check / Auto Shut-off |
| Valve Body Material | CS / SS 304 / SS 316 / PP / PTFE |
| Valve Trim Material | SS 304 / SS 316 |
| Vent & Drain Connection | 1/2" NPT (F) with plug or valve |
| Gaskets / Seals | CAF / AF 120 / PTFE |
| Fasteners (Studs, Nuts, U-Bolts) | MS / SS / EN-8 |
| Connection Type | Flanged / Threaded / Welded |
| Illumination | External light provision (for better visibility in steam applications) |
Applications
Transparent level gauges are suitable for almost all installations. In fact they permit:
- the use of mica shields or Polytrifluoroethylene shields to protect the glass from the corrosive action of the process fluid
- the observation of interface
- the observation of the liquid colour
This instrument consists of a metal body, machined to have an internal chamber and one or more front windows (on each side of the gauge). On each window a special high resistance plate transparent glass is applied with sealing joint and metal cover plate hold by bolts and nuts.
The chamber is connected to vessel with cross fittings and flanged, threaded or welded ends. Usually, between the instrument and its connecting ends, valves are fitted to consent shut-off piping and to disassemble the level gauge without to empty the vessel. Drain valves can also be fitted to cross fittings device.
To avoid leakage in case of glass breakage, safety ball-check device can be provided in cross-fittings or shut-off valves. This kind of indicator is suitable for water/steam. To protect glass surfaces from corrosive action of the process fluid, Transparent Level Gauges can be fitted with Mica shields or Polytrifluoroethylene shields. This kind of indicator is suitable for liquids colorless and very fluid.
In some case (i.e. for water / steam) the best reading is obtained by conveying upwards on the surface of separation (liquid/steam or vapor interface), a source of light, located on the back of the gauge, the rays of which are totally reflected down to the observer.
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