Operating hours counter digital with LCD display 230VAC

Working time counter DHM-DIN - DIN rail mounting

Product description

The DHM-DIN working time counter is designed for measuring the running time of equipment powered from 230 VAC mains. It counts the total time when the equipment is energized - suitable for machines, pumps, fans, compressors, production lines and generally all appliances that need to record the cumulative operating time.

When 230 VAC voltage is applied, the device automatically starts counting the time. The values are displayed on two displays and stored in memory even in the event of a power failure.

Technical specifications

• Supply voltage: 230 VAC (150-260 VAC), 50/60 Hz

• Power consumption: < 6 VA

• Counting time range: up to 99,999 hours

• Display:

  • 2× 3-digit display (digit height 9.2 mm)

  • Mode display:

    • HHH (hours) / MM (minutes) / S (seconds)

    • After exceeding 999 h → lower display shows hours and minutes (see detailed description below)

• Mounting: MCB (circuit breaker) profile, DIN rail mounting

• Reset: RESET button (for DHM-DIN press with a non-conductive tool through the RESET hole)

• Dimensions: 35.4 × 60 × 90 mm

Application and operating principle

1. Connection according to diagram - after supply voltage is applied, the counter automatically starts counting time from zero.

2. Display mode at new power-up:

   • Top display: HHH - three digits of the clock

   • Lower display: MM S - two digits of minutes + one digit of seconds

     • seconds increase by 1 every 6 seconds

3. After exceeding 999 hours:

   • The meaning of the displays changes:

     • Lower display → clock

     • right digit of lower display → minutes (increases by 1 every 6 minutes)

4. Power failure memory:

   • When the power supply is disconnected, the instrument retains the last measured value

   • When switched on again, it continues counting from the stored value

Resetting the counter

• DHM-48: Press the RESET button for 5 s

• DHM-DIN: press the hidden RESET button with a non-conductive tool (e.g. an insulated screwdriver)

• After the reset, all digits are set to 000000

Typical use

The counter is used for long-term monitoring of the operation of devices that are switched directly by the supply voltage:

• submersible pumps

• domestic waterworks / darling

• self-priming pumps

• rotating machines

• compressors

• exhaust fans (carpentry, industrial)

• production machines and lines

• any equipment where it is necessary to record the total operating time

Suitable for service intervals, maintenance planning, machine utilization control and equipment lifetime records.