Amron Inner-Lock Combo Box with Sound Powered Phone

The Amron International model 3125 Inner-Lock Combo Box is a full-featured, chamber communications and wiring system for a double lock chamber. Amron's model 3125 provides three methods of communication and allows users to set up chamber communications and electrical wiring in the inner lock with ease.

Communications using the model 3125 are accomplished by using the on/off switch and speaker, or by connecting a headset to the Neutrik style connector on the front of the box. The headset communication provides hands-free, full duplex communications. When power isn’t available, the sound-powered phone handset can be used to communicate. The sound-powered phone handset connects to a 1/4 in. phono plug jack on the bottom of the box.

Also included in the 3125 is a pre-wired temperature probe on the bottom of the box. When connected to Amron’s model 3129-01 Temperature Monitor, the probe reports internal chamber temperatures to the operator outside the chamber. Additional wiring is included in the model 3125 to support power connections for scrubber and chamber conditioning.

The 3125 box has a rear-mounted electrical penetrator with a 3/4 in. MNPT thread and a 1 1/2 in. hex head. The penetrator is mounted to the 3125 box using slotted screw holes so the box can be rotated and aligned vertically after the NPT threaded penetrator is screwed into the chamber penetrator.

Electrical wiring transits from outside through the electrical penetrator into the 3125. To make penetrator wiring easy, Amron highly recommends using Amron’s model 3127 Outside Junction Box to transit wiring through the chamber penetrator and into the 3125. Two 1/2 in. diameter electrical conduit connections on the bottom of the 3125 box are provided for scrubber and chamber conditioning wiring inside the chamber.

DISCLAIMER NOTICE: Amron's communications equipment is designed to be used in air chambers where oxygen concentrations remain below 23.5%. Our communications products (including communicators, speakers, entertainment systems, and other communications accessory items) are NOT designed for oxygen service, are not intrinsically safe, and do not meet the criteria given in NFPA-99, Chapter 20 and other applicable definitions. Use of our products in high-concentration Oxygen environments may result in serious injury and/or death.