Maintaining strict process control is critical in environments where product safety directly impacts human health. In pharmaceutical manufacturing—especially for products introduced into sensitive areas like the human eye—compliance with FDA regulations is non-negotiable. To meet these rigorous standards, a pharmaceutical company partnered with Johnson Controls to implement a reliable timing solution across their production facility: the DC-25T-DN-BCD countdown timer.

Supporting FDA-Compliant Airlock Procedures

In this application, the timers were installed at each access point leading into the sterile production area. These access points function as airlock chambers, where incoming materials—specifically ingredient drums—must undergo a sanitization process before entering the controlled environment.

Each airlock uses a sterilizing agent to eliminate bacteria and other contaminants. To ensure effectiveness, the drums must remain inside the chamber for a precise, predetermined duration. The DC-25T-DN-BCD timer enforces this process by counting down the required dwell time and restricting access during the cycle.

Using an integrated relay, the timer can lock out entry to the airlock until the countdown is complete. This prevents premature access and helps guarantee that every batch meets the required sterilization standards. At a glance, operators can clearly see how much time remains before it is safe to proceed, improving both compliance and workflow efficiency.

Simple, Reliable Operation for Demanding Environments

What sets the DC-25T-DN-BCD apart is its straightforward and durable control interface. The unit is operated through three external terminals connected to an internal opto-isolated board, ensuring dependable performance in industrial settings.

Large, red momentary push buttons provide intuitive control:

• Start/Stop allows operators to begin or pause the countdown.
• Reset (Terminal 2) returns the timer to its preset value.
• Restart (Terminal 3) immediately restarts the countdown from the preset time and begins timing again—an especially useful feature in fast-paced environments where efficiency matters.

Flexible Time Presets with BCD Rotary Controls

The timer features BCD rotary switches located on the unit, allowing users to precisely set countdown durations. With a simple adjustment using a flathead screwdriver, operators can configure times up to 99 minutes and 59 seconds. This flexibility ensures the timer can accommodate a wide range of process requirements.

Built for Visibility and Durability

Designed with industrial use in mind, the DC-25T-DN-BCD includes:

• 2.3-inch high-intensity LED display for long-distance visibility
• Black powder-coated aluminum enclosure that resists fingerprints, dust, and mold
• Versatile mounting options with 2×4 and 4×4 teardrop knockouts for easy installation
• Wide-range power input (120–240 VAC) with an included plug-in adapter for convenience

A Reliable Solution for Critical Timing Applications

By combining precise timing control, clear visual feedback, and rugged construction, the DC-25T-DN-BCD plays a vital role in maintaining sterile conditions and meeting FDA process requirements. Whether used in pharmaceutical production, food processing, or other regulated environments, this timer helps ensure that critical procedures are followed accurately—every time.

See standard product: DC-25T-DN-BCD

Watch tutorial video about standard product on YouTube

Visit our DC-Digital website

Contact us to ask about our customized products!