BL901-1 Integrated Flanged Sight Glass with Light
BL901-1 battery-powered integrated flanged sight glass light for vessel inspection. View the product, catalog dimensions, battery specification and configuration-specific approval guidance.
BL901-1 Integrated Flanged Sight Glass with Light
The BL901-1 integrated flanged sight glass with light places a battery-powered inspection lamp beside the viewing area in one flanged assembly. It gives operators a defined observation point on a tank or vessel when a permanent power cable is inconvenient. The photograph shows the lamp mounted on the bolted stainless steel window. This page covers that integrated flange form, rather than the separate BL901-1 bracket spotlight or the union-connected assembly.
Where This Design Fits
The 2025 Borlan Fluid catalog identifies this version as an integrated flanged sight glass light with a welded vessel connection. The lamp and viewing window are arranged together, so the installation can be specified as one inspection location. Battery power may suit a vessel where routing a continuous external supply is impractical, provided the operating and inspection schedule matches the selected battery configuration. For an existing window that only needs a separate lamp, consider the BL901-1 bracket-mounted sight glass spotlight.
- Catalog family: BL901-1 battery-powered sight-light series.
- Catalog reference: 4.5 V and 3 W for the illustrated family configuration, using three batteries. Confirm the exact supplied battery type and lamp construction.
- Connection: integrated flange assembly with a welded vessel connection in the catalog; verify the mating detail on an approved drawing.
- Flange choices: the catalog mentions several pressure-class arrangements, but the exact ordered class and the complete assembly rating need an approved drawing.
Catalog Reference Dimensions
The following drawing and table reproduce the BL901-1 integrated flanged dimension set from the 2025 catalog. Dimensions are in millimeters. In the drawing, D is the overall flange diameter, L1 and L2 are the marked section dimensions, and H is the lamp height above the flange reference. The catalog selection chart says DN80-DN200 for this form, while its detailed dimension table also prints DN50, DN65 and DN250 and omits DN200. Please treat these as drawing references, not guaranteed stocked sizes; confirm availability and the approved drawing for the requested DN.
| Size | D | L1 | L2 | H |
|---|---|---|---|---|
| DN50 | 100 | 11 | 14 | 113 |
| DN65 | 120 | 11 | 14 | 113 |
| DN80 | 140 | 12 | 16 | 113 |
| DN100 | 160 | 12 | 16 | 113 |
| DN125 | 180 | 12 | 17 | 113 |
| DN150 | 215 | 14 | 20 | 113 |
| DN250 | 325 | 15 | 20 | 113 |
Catalog dimensions are preliminary. Weld preparation, bolt arrangement, glass, gasket, wetted material and final assembly ratings require a configuration-specific drawing and quotation.
Battery and Certification Scope
For the BL901-1 DC 4.5 V, 3 W sight-light sample, Borlan Fluid holds Chinese explosion-proof certificate CLEx24.3249. The certificate identifies three 1.5 V AAA alkaline cells in series, Ex ib IIC T4 Gb / Ex ib IIIC T130°C Db markings and IP65 enclosure protection. It also prohibits charging, replacing or disassembling the batteries in a hazardous area. The certificate applies only to products matching the tested construction; a rechargeable-cell option, changed lamp or complete flange-and-window assembly must not be assumed to share that approval. Request the current certificate and configuration drawing when hazardous-area documentation is needed.
The catalog does not establish a universal pressure, temperature, vacuum or hygienic rating for every BL901-1 flanged assembly. Select the glass, seal, metal grade and connection according to the medium, cleaning method and vessel design. Borlan Fluid can review the proposed build and identify the documents needed for your project.
Frequently Asked Questions
Is this a separate battery spotlight?
No. This page shows the battery lamp mounted on an integrated flanged viewing-window assembly. The bracket spotlight is a separate lamp for use beside a compatible existing window.
Which DN sizes are available?
The catalog drawing lists DN50, DN65, DN80, DN100, DN125, DN150 and DN250 dimensions, but the series selection chart gives a different size range. Tell us your required DN and connection so the available build and drawing can be confirmed. No DN200 dimensions are printed in this drawing.
Can rechargeable batteries be used in a hazardous area?
Do not infer this from the family catalog. The cited explosion-proof certificate specifies three AAA alkaline cells for its tested sample and prohibits battery handling in a hazardous area. Ask for documentation covering the exact configuration and site requirements.
Request a Configuration-Specific Quote
Send the required DN, vessel opening and mating drawing, quantity, medium, pressure and temperature, glass and seal preference, metal grade, battery specification, inspection duty and any hazardous-area requirements. Contact Borlan Fluid for a reviewed BL901-1 integrated flanged sight glass with light proposal. If a removable union connection better suits the vessel, compare the BL901-1 integrated union sight glass light. For product demonstrations, visit the official Borlan Fluid YouTube channel and check that the video shows your intended configuration.
Borlan Fluid can help you throughout the design, sample, production, pack & supply.Borlan Fluid has its own design team which is able to deliver design services for Stainless Steel Tank Accessories.We will send you sample for the brochure after confirmed details.We can also offer you 3D model of our stock product.
Stock sample can send out within 1 day, custom sample doing time is 5-10 days. 1~100pcs
production time is 7~10 days, 500~1000pcs production time is 10~15 days. 1000~3000pcs
production time is 15~20 days.
a).You send us artwork.
b).You pay 30% deposit, if less than 100pcs, we suggest you pay full amount because production time will be quick (7~10 days).
c).We make a digital print proof sample take picture and video for you confirmation.
d).Start production.
e).Balance Paying before package sending out.
We are a professional manufacturer specializing in stainless steel sight glasses, sight glass lights, and tank accessories.
All products are designed and manufactured in our own factory, allowing us to control quality, lead time, and customization.
We supply a full range of stainless steel tank and pipeline accessories, including:
Sight glasses (union, flanged, pipe, fused, tubular)
Sight glass lights (integrated and separate types)
Explosion-proof sight glass lights
Manways and manholes
Spray balls and cleaning accessories
Sanitary fittings and customized tank accessories
Our standard materials include:
304 stainless steel
316 / 316L stainless steel
Other materials can be provided upon request depending on application requirements.
Yes.
All sight glass lights are CE certified, and comply with relevant CE conformity requirements.
Explosion-proof models can additionally comply with ATEX requirements when specified.
Yes.
We provide explosion-proof sight glass lights suitable for hazardous environments such as chemical, pharmaceutical, and petrochemical industries.
Please inform us of the required explosion-proof standard (e.g. ATEX、EX) when making an inquiry.
Yes.
Custom sizes and non-standard dimensions are available upon request.
We can customize:
Diameter and thickness
Connection types (flanged, clamp, welded, union)
Glass type
Lighting configuration
Available connection types include:
Flanged (DIN / ANSI / customized)
Union
Tri-clamp (sanitary)
Welded
Pipe inline connections
Our products are widely used in:
Chemical processing
Pharmaceutical manufacturing
Food & beverage
Biotechnology
Cosmetics
Environmental and water treatment industries
Yes.
We supply separate sight glass lights designed for external illumination of existing sight glasses.
Integrated and separate configurations are both available.
Depending on the model, we offer:
AC power supply
DC power supply
Battery-powered models
Voltage, wattage, and cable length can be customized.
Yes.
We supply sanitary stainless steel sight glasses and accessories, suitable for hygienic applications in food, beverage, and pharmaceutical industries.
All products undergo:
Material inspection
Dimensional inspection
Functional testing
Certification verification (CE where applicable)
This ensures consistent quality and reliability.
Lead time depends on:
Product type
Quantity
Customization requirements
Standard products usually have shorter lead times, while customized products may require additional production time.
Yes.
We support OEM and customized branding for overseas customers, including product marking and packaging.
You can contact us by:
Website inquiry form
Providing drawings or specifications if customization is required
Our sales team will respond with technical confirmation and quotation.
Request A Quote
To know more about our products and services, please fill out the contact form.
Contact Us
We are committed to producing the best quality products at the most competitive prices. Therefore, we sincerely invite all interested companies to contact us for more information.
jzxiang1992@gmail.com
Phone
+86-16657273263
+8616657273263
borlanfluid
Address
longwan town, wenzhou city,zhejiang province, China.
