At a Glance

  • System Fail-Safe
  • Loss of Control Detector
  • Dry Contact Relay Output
  • LED Output Indicator
  • G4, C4, and 70G I/O Rack Compatiblity
  • 5, 12, 15, or 24 Volt Logic
  • 3-Year Limited Warranty
  • 2 Second Timeout
  • Negative Edge-triggered
  • 1 Amp 20VA Fail-OPEN Output
  • User-specified Timeouts
  • Adjustable Timeouts
  • Fail-CLOSED Output
  • 5 Amp Output
  • Customize It! IPD is glad to quote your specific custom module


Brentek's G-WDT Series Watchdog Timer Modules monitor an I/O control system’s activity by detecting on/off transitions of a control line. During normal operation, the watchdog’s internal timer is continually reset by control line activity and its dry-contact output remains energized. When control is lost (control line stops toggling), the timer times-out and de-energizes the output contact, indicating “Loss of Control”. 

Loss of Control is caused by problems such as CPU latch-up, control system faults, wiring/cabling failure, unanticipated software conditions, communications problems, or power failures. The system designer can use the watchdog timer's output contact to address Loss-of-Control by energizing an alarm, shutting down the system, or providing a reset signal to the CPU/controller.

The G-WDT series watchdog timer modules use patented timing technology to monitor control system integrity.  They offer a compact footprint and provide direct plug-in compatibility with Industry-standard I/O racks from Brentek, OPTO 22 (G4), Grayhill (70G), and Crouzet.(C4) and also offer 4 logic voltages (5V, 12V, 15V, and 24V):

  • G-WDT5
  • G-WDT12
  • G-WDT15
  • G-WDT24

The standard timeout is 2 seconds and both customer-specified timeouts and adjustable timeouts are available.  These watchdog timers come standard with a dry contact output which is rated at 1 Amp resistive (20VA) and is configured to Fail-OPEN.  Optionally, they have a Fail-CLOSED relay that is rated at 0.5 Amps resistive (10 VA) or a 5 Amp Fail-OPEN output relay. 

The Brentek G-WDT5 Watchdog Timer Is available from IPD, Inc. on Amzaon.   The G-WDT5 is available from IPD, Inc. on Amazon.

How to Purchase Customize It!