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The 25SU3-2100 is a Flame Safeguard Amplifier used to detect the presence or absence of a flame in a single or multi-burner environment.

The Fireye 25SU3-2100 also maximizes burner discrimination with its ability to accurately differentiate the pulse rates produced by the scanners.

The 25SU3-2100 has the capacity to receive pulse inputs from two flame scanners, “A” and “B,” either separately or in combination. In addition, the 25SU3-2100 has two logic programs available, called “Scanner Option 1” and “Scanner Option 2.” Within these two scanner options, the user may select different operating parameters, and select the scanner or scanners that will provide the pulse input for that option. Switching between “Scanner Option 1” and “Scanner Option 2” is accomplished by an external dry contact input to the amplifier. The dynamic range for the 25SU3-2100 amplifier is 1900 pulses per second, which is consistent with the output range provided by Fireye scanners. The pulse rate output of each scanner can be checked by the user, thus facilitating the maintenance of each scanner.


  • Easy Upgrade. The new 19" Adapter gives operators the ability to easily field convert existing 25SU3 type controls to the new 25SU3-2100 amplifier.
  • Plug-In Convenience. The 19" Adapter with the 25SU3-2100 Amplifier simply plugs into existing 60-1706 racks.
  • Application Flexibility. Both high and low volt age Fireye scanners - 45UV5, 45RM1, 45RM2, 45RM4, and 45FS1 - are compatible with the new 19" Adapter and 25SU3-2100 Amplifier.
  • Electrical and Mechanical Compatibility. Since the 19" Adapter is electrically (“pin for pin”) and mechanically compatible with the existing wiring in the 60-1706 rack, in most applications, no electrical or mechanical changes are required to the existing installed enclosure.
  • Two Adapters are Available. A 120V version (192SU3-2120) and a 220V version (192SU3-2220) are available, each one providing power to the 25SU3-2100 from either a 120 VAC or 220 VAC source.