UV Sterilization Pass Box

What is the UV Sterilization Pass Box?

A UV sterilization pass box adds 254 nm UV-C lamps to an interlocked chamber so that item surfaces receive a timed irradiation dose during transfer. It is used in laboratories and pharmaceutical areas that want an additional surface bioburden control.

Overview

One or more UV-C lamps, typically 15–30 W each at 254 nm, are fitted to the ceiling or sides of the chamber, with timers of 10–30 minutes. The controller disables UV when a door opens using a safety switch. The dose is the product of irradiance and time, for example 1 mW/cm2 for 10 minutes gives 600 mJ/cm2 at the surface, although shadowed areas receive less. Chambers are 304 stainless steel, since UV degrades plastics, with a stainless interior and glass windows filtered against UV leakage. Interlocks are electromagnetic. Lamp life is about 8000 hours with output declining over time, so regular measurement with a UV radiometer is needed.

How does it work?

A pass box is a stainless steel or powder-coated steel chamber with two doors, one facing each side of the wall. Mechanical, electromagnetic or electronic interlocks ensure that only one door can open at a time, so the two areas are never directly connected. Static versions rely on this interlock alone, with smooth surfaces and coved corners that can be wiped down. Dynamic versions add a fan, prefilter and HEPA filter that flush the chamber with clean air, typically at 0.3–0.5 m/s. Some versions include UV-C lamps at 254 nm to reduce surface microbes, or VHP-compatible seals for decontamination. Viewing windows of tempered glass, indicator lamps and door-status controls help operators. Wall-mounting frames must be sealed to the partition to maintain room pressure cascades.

What are the key features?

• 254 nm UV-C lamps, 15–30 W each
• Timer 10–30 minutes with door safety switch
• Stainless steel interior resistant to UV degradation
• UV-blocking viewing windows
• Electromagnetic door interlock
• Lamp hour counter and status indicators

What are the technical specifications?

A typical uv sterilization pass box configuration offers UV wavelength of 254 nm (UV-C), UV lamp power of 15–30 W per lamp, 1–3 lamps, timer range of 10–30 min, irradiance at 1 m of ≥ 70 μW/cm2 for new lamp, internal size of 400 × 400 × 400 to 600 × 600 × 600 mm and interlock of Electromagnetic. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The UV Sterilization Pass Box is used in microbiology laboratories, pharmaceutical QC, cell culture facilities and food testing laboratories. Across the wider Pass Boxes class, laboratories also deploy it for pharmaceutical material transfer, sterile manufacturing and hospital pharmacies.

Which standards and certifications apply?

Relevant standards and methods include ISO 14644-1 (cleanroom classification), ISO 14644-4 (design and construction), EU GMP Annex 1 (sterile manufacturing), GB 50073 (cleanroom design code), JG/T 382 and EN 1822 (HEPA and ULPA filters). Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the pass box during wall construction or in a prepared opening, sealing the flange with silicone or gaskets so pressure differentials are maintained. Interlock function and emergency release should be tested at commissioning. Clean chambers before and after each use with compatible disinfectants, avoiding chlorides on stainless steel. UV lamps lose output after about 8000 hours and should be replaced and measured with a UV meter. Dynamic boxes require prefilter replacement every 3–6 months and HEPA integrity testing annually. Define SOPs for which items may be transferred and how long doors may remain open, and document cleaning for GMP audits.

How do I select the right UV Sterilization Pass Box?

Select UV models when a supplementary surface microbial reduction is wanted and items are non-porous and not UV sensitive. UV does not replace wipe-down or VHP for sterile manufacturing. RFQ: chamber size, number of lamps, timer range and lamp replacement plan.

How does it compare with other Pass Boxes variants?

Decide first whether a static, dynamic or decontamination-capable box is needed. Static boxes suit transfers between rooms of similar class, while dynamic boxes suit a step of at least one ISO class, for example ISO 8 to ISO 7. Check chamber size against the largest item, with common clear sizes from 400 × 400 × 400 mm to 800 × 800 × 800 mm, and the wall thickness, which is 50–100 mm for panels. Select the interlock type, mechanical for cost, electromagnetic or electronic for control and alarms. Consider UV, VHP or bio-decontamination requirements, housing material, and whether the chamber needs a floor-standing roller conveyor. Confirm the electrical and control interface.