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Cleanroom Equipment Spare Parts
Pass Box Interlock Controller
A compact electronic module that coordinates two pass box doors, lock outputs, status indication and timed transfer sequences.
- Two-Door Interlock Logic
- Visible Status Indication
- Removable Terminal Blocks
- Service-Friendly Replacement
Product Introduction
The pass box interlock controller is the central logic module for a two-door cleanroom transfer chamber. It reads door-position and request signals, energizes the appropriate electric lock, prevents both doors from being released together and provides local operating status. A compact flame-retardant enclosure, removable screw terminals and plug connectors simplify replacement inside an equipment compartment. Electrical supply, input type, lock voltage, output loading, timing logic and connector pinout must be matched to the existing pass box before installation.
Key Features
A numeric display and separate status LEDs support rapid operating checks.
Removable terminal blocks allow field wiring to remain organized during module replacement.
Membrane keys provide local access to timing and operating adjustments without an external programmer.
Customer Product Concerns
A replacement controller must reproduce the existing door sequence and electrical interfaces without defeating the transfer chamber interlock.
Incorrect interlock logic can permit both doors to unlock at the same time.Two-door sequencing is configured so one release output remains inhibited while the opposite door is open or unlocked.
An incompatible lock output may overload the controller or fail to release the door.Supply voltage, output type and allowable load are matched to the installed electromagnetic or electric-bolt locks.
Unclear fault status makes a failed sensor difficult to distinguish from a lock problem.Display and indicator states provide direct feedback for door requests, interlock state and connected input conditions.
Rewiring a replacement module increases downtime and connection errors.Detachable terminal blocks and keyed plug interfaces support labeled, one-for-one service replacement.
Typical Applications
Static cleanroom pass boxesDynamic pass-through chambersMaterial transfer hatchesReplacement controls for interlocked transfer cabinets
Technical Parameters
Typical construction and integration ranges for pass box interlock control modules are shown below.
| Core Material | Flame-retardant engineering-plastic enclosure with printed circuit assembly and copper terminals |
|---|---|
| Panel Thickness | 25-55 mm nominal controller enclosure depth |
| Effective Width | 90-180 mm nominal module width |
| Maximum Length | Up to 240 mm overall length including terminal and plug clearance |
| Steel Facing Thickness | 0.8-1.5 mm for optional galvanized mounting plate |
| Core Density | 1150-1450 kg/m³ for the engineering-plastic enclosure |
| Thermal Conductivity | 0.20-0.35 W/(m·K) for the enclosure material |
| Surface Finish | Textured black molded housing with green removable terminals and white keyed connectors |
| Joint Type | Screw-terminal field connections with keyed multi-pin plug interfaces and flange mounting |
| Customization | Available based on the intended application and operating environment. |
Available Options
Matched AC or DC supply inputElectromagnetic-lock or electric-bolt output logicBuzzer and indicator-light interfacesCustom timing and connector pinout
Planning a Pass Box Interlock Controller specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
