The construction of the Alfa Laval range of sight glasses varies, depending on the type of sight glass. For more information, please refer to the specific type below.
Typically used in tanks with high pressures and temperatures, this bolted sight glass consists of a base flange, which welded onto or into the tank wall, a cover flange, gaskets, a glass disc, nuts and studs. Provided that the flange is welded correctly onto/into the tank, the flange thickness guarantees a distortion-free location for the glass disc. The sight glass can be fitted with an optional miniVision light fitting.
Sight glass DIN 28120
The sight glass is engineered with a welding nozzle that is welded onto the tank wall, a grooved collar nut, a glass disc and two gaskets. The sight glass comes in sizes from DN50 (with a free view of 50 mm) to DN150 (with a free view of 150 mm). The sight glass can be fitted with an optional miniVision light fitting.
Sight glass type LKS is available in three types. Sight glass type LKS 105 (free view: 105 mm) is designed for installation above the liquid level in pressure-less storage tanks. Sight glass types LKS 78 (free view: 78 mm) and LKS 120 (free view: 120 mm) are designed for pressure tanks. All LKS sight glasses consist of a threaded flange, which is welded onto the tank, gaskets, a glass disc and a retaining ring.
Sight glass Elongated
The elongated sight glass is used for the observation of the liquid level or reaction within the tank or vessel. It consists of a base flange that is welded into or onto the tank wall, a cover flange, a glass disc and gaskets.
Two versions of the Alfa Laval elongated sight glass are available.
· DB version has a base flange with bolt tappings drilled through
· SL version has a base flange with blind tappings
Sight glass Metal-fused
Suitable for food processing and sterile applications, the Alfa Laval metal-fused sight glass is mounted on clamp fittings in accordance with DIN 32676.
Sight glass LKFL in-line
The LKFL in-line sight glass is used in processes that require observation of a product in a pipeline.
It consists of a tube with two screw connections for the glass. The connections are placed opposite each other to enable positioning of the glass very close to the internal wall of the tube.
An optional halogen light source, which is fitted onto one of the sockets, is available. The halogen light source consists of two stainless steel tubes assembled with a clamp.
The standard LKFL connections are welding ends. Upon request, the LKFL is also available with male part connections.
Sight glass LKG in-line
The Alfa Laval LKG in-line sight glass is used in pipe systems where a visual observation of the product flow is necessary. Two types are available: the LKGG-1 and the LKGL-1.
The LKGG-1 consists of a perforated stainless steel shield tube fitted with a welding union at each end. A special glass tube is fixed in the shield tube so that it is unaffected by potential stresses in the pipelines.
The LKGL-1 is similar to LKGG-1, but has a stainless steel light fitting welded onto the shield tube so that the product can be illuminated.