There is not a fully self-contained delayed egress like a Von Duprin Chex-It device but the Falcon RX-25 Series can perform a delayed egress by using the DE5300 controller, power supply, ...
Use a multi-meter in series with the batteries to measure battery current. Be sure your multi-meter can accurately measure very low current, in the micro-amp range.
See the attached Technical Not...
The RX-LC and LX-LC (Low Current) switches are used for current up to 0.05 amps at 24 VDC and the standard RX and LX switches are used for current greater than 0.05 amps up to 0.5 amps at 24 VDC.
The 2030 closer requires a minimum 1-3/8" top rail on the door for the standard track.
For a top rail less than 1-3/8" and as narrow as 1", you could use the l...