Trumeter | Innovation by Design
Trumeter | Innovation by Design

HED 251

4 Digit panel mount counter 24mm X 48mm


24 X 48mm 4 digit totalising counter suitable for many OEM applications. Ideal for contact closure and reed switch signal inputs.

These miniature 4 digit totalising counters are suitable for either direct PCB mounting or panel mounting.


  • Uses the latest CMOS circuitry to achieve very low quiescent current consumption, less than 10uA, typically 5uA
  • 10mm black character high contrast LCD display
  • Backlit version HED251-T
  • Counts pulses up to 10Hz frequency
  • External reset input
  • UL and cUL approved

PDF Instructions


Supply Voltage



4 digit black LCD, 10mm characters with leading zero blanking

Count Range


Count Input

Contact closure open collector input. 10Hz max, negative edge triggered, 0.7V threshold 1.8V max, 25mS min pulse width

Reset Input

Negative edge triggered, 0.7V threshold, 15mS minimum pulse length, TTL/CMOS Compatible

Operating Temp

-10°C to +50°C

Storage Temp

-20°C to +70°C

Ordering Information


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