Trumeter | Innovation by Design
Trumeter | Innovation by Design


Electronic Totaliser

Trumeter 7400AS Electronic Totaliser

8 digit LCD bi-directional totalising counter for PCB mounting, with pushbutton reset.

This PCB mount bi-directional totalising counter operates from an external 3VDC supply. It is supplied with an electrical reset.


  • 8 digit high contrast LCD characters
  • Latest CMOS circuitry achieves an expected battery life of 10 years (1/2 AA 900mAH 3V lithium battery)
  • Remote reset facility
  • Leading zero blanking
  • Add/subtract counting of pulses up to 10kHz
  • Low speed contact closure input with integral de-bounce circuitry
  • CE, UL and cUL approved

Inputs are provided for count, direction and external reset.

PDF Instructions


Supply Voltage

2.6 – 3.4VDC

Current Consumption

Less than 10µA, typically 5µA


8 digit, 8mm height, high contrast LCD characters with leading zero blanking

Electronic Count Input (1)

10kHz maximum, positive edge triggered, 0.7V threshold, 100µS minimum pulse length, TTL/CMOS Compatible

Low Speed Count Input (2)

Contact closure/open collector input, 30Hz maximum, negative edge triggered, 0.7V threshold, 25mS minimum pulse length

Reset Input (R)

Contact closure/open collector, negative edge triggered, 0.7V threshold, 15mS minimum pulse length

Direction Input (D)

Electronic input TTL/CMOS Compatible. Add=logic 1, Subtract=logic 0(0V)

Operating Temp

-10°C to +60°C

Storage Temp

-20°C to +70°C

Ordering Information

7400AS – With pushbutton reset

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