Operating hour meter with digital LCD display 230VAC

DHM-DIN working time counter - DIN rail mountable

Product description

The DHM-DIN working hours counter is designed to measure the operating time of equipment powered by a 230 VAC mains supply. It counts the total time the equipment is powered - suitable for machines, pumps, fans, compressors, production lines and generally any equipment where the total operating time needs to be recorded.

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

Technical data

• Power supply: 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)

  • Operating mode display:

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

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

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

• 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 as shown in the figure - after turning on the power supply, the counter automatically starts counting the time from zero.

2. Display mode when first switched on:

   • Upper display: HHH - three digits of the hour.

   • Lower display: MM S - two digits for minutes + one digit for 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 the lower display → minutes (increases by 1 every 6 minutes)

4. Power failure memory:

   • If the power supply is interrupted, the instrument retains the last measured value.

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

Reset the counter

• DHM-48: Press the RESET button for 5 seconds.

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

• After resetting, all digits will be set to 000000 .

Typical usage

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

• submersible pumps

• domestic waterworks / darling

• self-priming pumps

• rotating machines

• compressors

• exhaust fans (carpentry, industrial)

• production machines and production lines

• all equipment where the total operating time must be recorded.

Suitable for service intervals, maintenance planning, machine utilization monitoring and equipment life cycle tracking.