Tcn series counter with following details. 1. Backup data for power fail 2. 6 or 4 position digit counter 3. Precision measuring and easy-read, high anti-interference 4. Output alarm with relay Model and parameter Counting signal Input impedance More than 100kª+ Input level H more than 5v; l less than 2v Max. Input 50v Step Descend edge Relay output Output mode R, n, c, f Output cycle 0-99.9s Contact burden 250vac/3a Power supply Ac90v-260v (50hz) Anti-interference Iec801 3g Ambinet temperature 0 to +50ípc Storage temperature -20ípc to +70ípc Withstand impedance Min100mª+ Counting speed (5 class forset) 20cps, 200cps, 3000c ps, 10000cps Carton