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Cleanroom Control and Environmental Monitoring Systems
Pass Box Interlock System
A compact paired-door interlock that keeps opposite pass box doors mutually exclusive and gives operators clear release, locked and door-open feedback.
- Mutually Exclusive Doors
- Compact Embedded Controller
- Door-Open Alarm
- Timed Opposite-Door Release
Product Introduction
The pass box interlock system is designed for two closely coupled transfer-hatch doors. Magnetic contacts confirm the actual door position, while compact electric strikes or electromagnetic locks enforce the interlock. Stainless pushbutton indicators on each side show whether the local door is available, occupied or locked. A release delay can be added after closure, and optional germicidal-cycle or purge-ready inputs can hold both doors locked while the pass box completes its internal sequence.
Key Features
Door contacts verify physical closure instead of relying only on the lock command.
Illuminated stainless buttons communicate local request and availability at both sides.
Optional cycle input keeps both doors secured during purge or internal treatment operation.
Customer Product Concerns
A pass box interlock must fit a compact enclosure and tolerate frequent door cycles while protecting the transfer boundary.
One door appears closed but the latch has not fully seated.A dedicated magnetic contact confirms actual closure before the opposite lock releases.
Operators on opposite sides cannot see which door is being used.Local illuminated indicators show available, occupied and alarm states on both faces.
Door slamming causes contacts to bounce and the opposite lock to chatter.Input debounce and a short release delay stabilize the sequence after closure.
A purge or treatment cycle is interrupted by an early door request.A cycle-hold input locks both doors until the pass box confirms completion.
Typical Applications
Static transfer hatchesDynamic pass boxesSterile material transferLaboratory specimen pass-throughs
Technical Parameters
Typical materials and dimensions for a compact pass box door interlock controller are shown below.
| Core Material | Stainless steel faceplates with FR-4 interlock board, copper relays and flame-retardant polymer terminals |
|---|---|
| Panel Thickness | 35-90 mm embedded controller depth |
| Effective Width | 100-250 mm controller or faceplate width |
| Maximum Length | Up to 350 mm controller enclosure length |
| Steel Facing Thickness | 1.0-1.5 mm 304 stainless steel faceplates |
| Core Density | 7900-8030 kg/m³ for 304 stainless steel parts |
| Thermal Conductivity | 14-17 W/(m·K) for 304 stainless steel faceplates |
| Surface Finish | Brushed 304 stainless steel with green request and red locked indicators |
| Joint Type | Embedded two-door controller with quick-connect lock, contact, lamp and cycle terminals |
| Customization | Available based on the intended application and operating environment. |
Available Options
Electric strike or magnetic lockPurge-cycle lock inputDoor-open buzzerFlush stainless indicator plates
Planning a Pass Box Interlock System specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
