Miselli Oil Level Sight Glass Series SLC and SLP
The Miselli Oil Level Sight Glass Series SLC and SLP is an essential transparent polyamide resin component for hydraulic tanks. Designed to withstand mineral oils, synthetic oils, and diesel fuel up to 100 °C, it guarantees extreme reliability. The SLC series features a closed thread with anti-stagnation design for consistently accurate readings. The SLP series, equipped with an NBR 70 Sh O-Ring, is optimized for practical and secure press-fit mounting on non-pressurized tanks.
The Miselli Oil Level Sight Glass Series SLC and SLP represents a high-precision technical solution for visual fluid monitoring inside hydraulic systems. Made entirely of transparent polyamide resin, these level sight glasses provide a clear and long-lasting view of the fluid level inside the tank. The specific plastic material formulation ensures excellent mechanical and chemical resistance in contact with synthetic oils, mineral oils, diesel fuel, and certain types of gasoline. To preserve the structural integrity of the sight glass and prevent clouding or failure, the manufacturer strictly recommends avoiding exposure to alcohol in general, coolants, and cleaning liquids containing alcohol-based substances. Both series ensure optimal performance with a recommended maximum operating temperature of 100 °C.
The SLC series stands out for its hexagonal head construction with an internally closed thread. The true engineering advantage of this model lies in the special design of the threaded area. This geometry completely eliminates the possibility of any oil residue stagnating inside the sight glass. This feature prevents false readings, avoiding the operator being misled into thinking liquid is present even when the actual level has dropped below the minimum safety threshold. The range is available in SLC/38 (G 3/8 thread) with a recommended maximum tightening torque of 6 Nm, and SLC/12 (G 1/2 thread), tolerating up to 10 Nm.
Specifically designed for use on non-pressurized tanks, the SLP series ensures reliable oil-tight sealing through an O-Ring gasket made of NBR 70 Sh synthetic rubber. Visually, reading efficiency is maximized by an internal contrast screen. Installation is carried out by press-fitting into dedicated holes. For correct installation, the technical specifications require housing on sheet metal with a thickness greater than or equal to 5 mm. The drilling diameter must comply with a strict dimensional tolerance of ± 0.1 mm, together with a 1/45° entry chamfer to facilitate insertion without pinching or wearing the O-Ring. The available models (from SLP/17 to SLP/40) cover drilling diameters from 17 mm to 40 mm, adapting to different flow and visibility requirements.
Technical summary table of the main characteristics of the Miselli Oil Level Sight Glass Series SLC and SLP.
| Feature | Value |
|---|---|
| Body material | Transparent polyamide resin |
| Max operating temperature | 100 °C |
| Compatible fluids | Synthetic oils, mineral oils, diesel fuel, some gasoline types |
| INCOMPATIBLE fluids | Alcohol in general, coolants, alcohol-based cleaners |
| SLC Series fixing | Screw-mounted (Hexagonal head, internally closed thread) |
| SLP Series gasket | O-Ring in NBR 70 Sh synthetic rubber |
| SLP Series fixing | Press-fit mounting for NON-pressurized tanks |
| Sheet metal thickness for SLP | ≥ 5 mm |
| Drilling tolerance for SLP | ± 0.1 mm with 1/45° entry chamfer |