BL401-3 Integrated Flanged Sight Glass with Light

BL401-3 Integrated Flanged Sight Glass with Light

The BL401-3 integrated flanged sight glass with light combines a wired inspection lamp and a viewing window in one flanged assembly. It provides an illuminated observation point on a vessel where operators need to see inside during a process step. The lamp sits beside the viewing area on the flange, as shown in the product photograph. This page describes the integrated flanged assembly in Borlan Fluid’s 2025 catalog, not the separate bracket-mounted spotlight, union sight glass or BL401-3D high-power variant.

How This Flanged Assembly Is Selected

The catalog depicts a lamp mounted directly on a bolted flanged observation window and lists a welded connection for this integrated flanged form. It is intended as one inspection location with the light and window arranged together. The photographed cable is a product example; cable length, termination and power supply must be specified for the order. If your vessel already has a suitable sight glass and only needs a separate light, consider a BL401-3 bracket-mounted sight glass spotlight instead.

• Catalog form: BL401-3 integrated flanged sight glass light.
• Reference sizes: DN50, DN65, DN80, DN100, DN125, DN150 and DN250 in the 2025 catalog table.
• Lighting: externally supplied wired BL401-3 lamp. The family catalog gives 12-24 V AC/DC input options and a 3 W BL401-3 reference; confirm the ordered driver and power rating.
• Optional wiper: the catalog notes that a wiper can be discussed from DN80 upward, subject to the final assembly drawing.

BL401-3 Integrated Flange Dimensions

The drawing and table below are the integrated flanged sight glass light rows from Borlan Fluid’s 2025 catalog. Dimensions are in millimeters. The drawing labels D, L1, L2 and H. The published table jumps from DN150 to DN250; it does not give a DN200 row for this configuration. Do not infer a DN200 dimension from another flange or sight-light series.

Catalog reference dimensions only. Confirm the vessel opening, weld and bolt details, glass, seal, material and final approved drawing for the selected assembly.

Power, Certification and Process Conditions

Identify the available electrical supply, installation area, required lighting duration, cable route and exact lamp power when requesting a quotation. The 2025 catalog lists a 3 W BL401-3 family reference, while the available BL401-3 explosion-proof certificate covers a DC 12-24 V, 7 W tested lamp sample. These are different documented configurations. Do not assume that the catalog 3 W assembly, a BL401-3D option or a changed cable entry inherits the 7 W sample certificate. Ask Borlan Fluid for the certificate and approved construction matching the exact product to be supplied.

Pressure, temperature, vacuum, glass and gasket selections depend on the final sight-glass assembly and operating conditions. The dimension table does not establish those ratings. Provide the process medium, cleaning method, required wetted material and vessel drawing so Borlan Fluid can review the connection and documentation before manufacture.

الأسئلة الشائعة

Is this the same as a bracket-mounted BL401-3 spotlight?

No. This page describes a flanged viewing-window assembly with the light integrated at that location. A bracket-mounted spotlight is a separate lamp used beside an existing sight glass.

Is DN200 included in the catalog dimension table?

No. The integrated flanged table lists DN50 through DN150 and DN250. Request an approved drawing and quotation if your installation requires DN200.

Does every BL401-3 flange configuration carry the same explosion-proof approval?

No. Approval must be checked against the exact lamp, power rating, wiring and assembly configuration. The available certificate is for a particular 7 W, DC 12-24 V sample and cannot be generalized to the 3 W catalog reference.

Request a Flange-Specific Quote

Send the required DN size, vessel and mating drawings, quantity, electrical supply, lamp power, process medium, pressure and temperature, glass and seal requirements, cable details, any wiper need and hazardous-area documentation requirement. Contact Borlan Fluid for a reviewed BL401-3 integrated flanged sight glass with light proposal. For a different mounting form, compare the BL401-3 integrated union sight glass light. Product footage may be available on the official Borlan Fluid YouTube channel; confirm the video matches your intended configuration.