Trumeter | Innovation by Design
Trumeter | Innovation by Design

HED 251-T panel-mount counter

HED 251 electronic totalising counter

4- digit panel-mount electronic totaliser [24mm X 48mm]

The HED 251-T is a 4-digit totalising counter designed for either direct PCB mounting or panel mounting. These miniature electronic counters are 24mm x 48mm in size and are ideal for contact closure and reed switch signal inputs. As a result they are suitable for a range of OEM applications.

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  • Uses the latest CMOS circuitry to achieve very low quiescent current consumption, less than 10uA, typically 5uA
  • 10mm black character and high contrast LCD display
  • Backlit resulting in even better visibility
  • Counts pulses up to 10Hz frequency
  • External reset input
  • UL and cUL approved
  • For an 8-digit option see the HED 261-T.

PDF Instructions

CE Certificate

REACH, WEEE and RoHS Documentation


Supply Voltage

2.7 – 3.3 VDC


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

Count Range


Count Input

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

Reset Input

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

Operating Temp

-10°C to +50°C

Storage Temp

-20°C to +70°C

Ordering Information


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