FB Explosion-Proof Safety Light Curtain
A build-to-order Ex rehousing service: the optics of the DAIDISIKE curtain already guarding your machine, welded into a steel enclosure engineered for hazardous-area duty.
- Enclosure engineered to GB3836-2010
- Design marking Ex nR IIC T6 Gc / Ex tb IIIC T80°C
- Model code mirrors your on-site curtain (e.g. FB-DQA08-200-1400)
- G1/2 Ex gland + 2 m explosion-proof flexible conduit included
- Wall-mounted, outdoor-rated, optional rain cover
How the FB Build-to-Order Program Works
Plants that handle solvents, fuel gas or fine combustible dust often cannot install a standard aluminium-profile light curtain at the point of operation — yet the machine still needs finger, hand or body guarding. The FB program solves this without forcing you onto unfamiliar optics: you name the DAIDISIKE curtain currently on (or specified for) the machine, and we fabricate a welded-steel explosion-proof enclosure around that same sensing core.
The enclosure is engineered to the Chinese explosive-atmosphere equipment standard GB3836-2010, carrying a design marking of Ex nR IIC T6 Gc / Ex tb IIIC T80°C. Steel plate is welded, shot-blasted and electrostatically powder-coated in a dedicated two-tone finish; the sealing rubber is the oil- and corrosion-resistant national-standard RTY-III type. Wiring leaves each column through a G1/2 (NPT1/2, DN15) explosion-proof gland sized for 7–10 mm cable, and a 2 m Ex flexible conduit is packed with every unit for the run back to the safe-area panel.
Because the finished unit is named after your existing curtain — FB-DQA08-200-1400 is an FB build around a DQA 8-beam, 200 mm-pitch, 1400 mm-class configuration — procurement paperwork, installation drawings and spare-parts planning all line up with what your maintenance team already documents.
The Optical Core: Standard DAIDISIKE Curtains
FB units keep the through-beam optics of DAIDISIKE's standard curtain series (DQA, DQB, DQBK, DQC, DQE, DQL, DQM, DQQ, DQT, DQZ) — only the housing changes for hazardous-area duty.
Enclosure & Build Specifications
| Series | FB (explosion-proof, custom-built) |
|---|---|
| Design standard | Engineered to GB3836-2010 (Chinese explosive-atmosphere equipment standard) |
| Explosion-protection design marking | Ex nR IIC T6 Gc / Ex tb IIIC T80°C per GB3836-2010. Explosion-proof rating for the specific installation per project specification — a valid certificate for your zone must be confirmed before use; certification documents are available on request. |
| Enclosure material & finish | Welded steel plate, shot-blasted, electrostatic powder coating, dedicated two-tone color |
| Enclosure cross-section | 80 mm × 80 mm (drilling position tolerance ±0.5 mm) |
| Cable entry | G1/2 / NPT1/2 (DN15) explosion-proof gland, cable OD 7–10 mm |
| Supplied conduit | 2 m explosion-proof flexible conduit (longer runs on request) |
| Sealing rubber | Oil-resistant, corrosion-resistant national-standard RTY-III |
| Installation | Wall-mounted, outdoor-rated; optional rain cover |
| Reference build (8-beam) | Overall length 1430 mm (1410 mm inner), mounting-hole span 1250 mm, housing height 110 mm |
| Reference mounting (8-beam) | M6 mounting studs, Ø8 mm mounting holes, 100 mm end brackets each side |
| Compatible base series | DQA, DQB, DQBK, DQC, DQE, DQL, DQM, DQQ, DQT, DQZ |
| Optical / response data | Follows the enclosed base curtain; the assembled-unit figures are confirmed per project specification. |
Parameters not listed above (assembled-unit IP rating, operating temperature range, PL/Category of the complete Ex assembly) are confirmed per project — we do not publish figures that have not been verified for a given build.
Where FB Units Are Deployed
Petrochemical & Chemical Processing
Access-point guarding on machinery inside solvent, gas and chemical handling areas where standard aluminium curtain housings are not acceptable.
Combustible Dust Environments
Wood flour, grain, powder-coating and similar dust-classified rooms — the sealed steel enclosure keeps the optics guarded against the atmosphere.
Oil & Gas Sites, Outdoor Skids
Wall-mounted, outdoor-rated construction with optional rain cover suits pump skids, loading bays and open-air process frames.
Retrofit of Existing Guarding
Because the FB model code mirrors the curtain already on your machine, mounting layouts and control wiring carry over with minimal re-engineering.
Specifying Your FB Unit — 4 Steps
- Identify the base curtain. Send the series, beam count, beam pitch and protective height of the curtain on your machine (label photo is fine) — this fixes the optics and the FB model code.
- Declare the classified area in writing. Zone, gas/dust group and temperature class let us check the Ex nR IIC T6 Gc / Ex tb IIIC T80°C design marking against your local requirements; where your jurisdiction requires ATEX or IECEx rather than GB3836, say so before ordering.
- Plan the wiring run. The standard 2 m Ex flexible conduit covers most exits to a nearby junction point; specify longer routing at order time.
- Close the safety loop. In the safe-area panel, land the curtain outputs on a DQSRN or DA31 safety relay module so the stop function is carried by forcibly guided contacts with feedback monitoring.
Frequently Asked Questions
Why is the FB series quoted per project instead of sold from stock?
Each FB unit is fabricated around the exact curtain you already run — series, beam count, beam pitch and protective height all vary — so the steel enclosure is welded, machined and finished to order. There is no generic off-the-shelf FB housing; the quotation covers your specific configuration and its fabrication lead time.
How do I read or build an FB model code?
Take your existing DAIDISIKE curtain designation and prefix it with FB-. For instance FB-DQA08-200-1400 describes an explosion-proof build around a DQA curtain with 8 beams at 200 mm pitch in a 1400 mm-class housing. If you send us the label data from the curtain on your machine, we generate the matching FB code for you.
Which DAIDISIKE curtain families can be fitted into the Ex enclosure?
The welded enclosure has been produced around the DQA, DQB, DQBK, DQC, DQE, DQL, DQM, DQQ, DQT and DQZ through-beam series. If your site runs one of these, the same optical performance you already know is retained inside the explosion-proof build.
Does the Ex design marking mean the unit is certified for my zone?
No — they are two different things. The enclosure is engineered to GB3836-2010 with a design marking of Ex nR IIC T6 Gc / Ex tb IIIC T80°C. The explosion-proof rating applicable to your installation is confirmed per project specification: tell us your zone classification, gas/dust group and temperature class in writing, and certification documents are available on request before you order.
What does the cable entry look like, and what is included for wiring?
Each housing carries a G1/2 (NPT1/2, DN15) explosion-proof gland accepting cable of 7–10 mm outer diameter, and every unit ships with a 2 m explosion-proof flexible conduit for the run out of the classified area. Longer runs or special routing can be specified at order time.
How should the safety outputs be integrated into the machine circuit?
Exactly as with the base curtain: route the outputs through a safety relay module in the safe-area control panel — pair the curtain with a DQSRN or DA31 safety relay to convert the signal into forcibly guided contactor control and feedback monitoring.
What is the minimum order quantity and typical lead time?
MOQ is one unit — this is a project product, and single-machine retrofits are normal. Lead time depends on the enclosure fabrication and the base curtain configuration, so it is confirmed with your quotation; contact us with your model details for a current schedule. OEM branding and export packaging can be arranged for machine builders.