Code: STH-42
  • up-down hour meter
  • self-powered (lithium battery)
  • 7 years battery lifetime
  • input: dry contact / OC / voltage
  • remote reset
  • small panel size DIN 48 x 24 mm



The STH-42 series is a self-powered LCD hourmeter in a small form. With a panel size of DIN 48 x 24 mm, it is perfect for limited space installations. It is powered by a replaceable lithium battery that lasts approximately 7 years, no external power required. The STH-42 series is available in 7 digits with 8 mm height figures with remote reset. Input signal includes dry contact, open collector, voltage, wide range voltage, with max. resolution 1 count per 1/10 hour. The front panel protection is IP54 and wiring connection is easily done via the terminal block connector, making it secure and reliable.

Number of inputs
Input type
voltage (V)
contact / Open Collector / voltage (NPN)
Input levels
dry contact/OC/NPN: low 0.8V, high 2...30V; wide-range voltage input: low 0...10V AC/DC, high 20...250V AC/DC
Input frequency
max. 30 Hz (dry contact / Open Collector / NPN) or max. 20 Hz (wide-range voltage input)
Output type
no output
Measurement method
electrical, pulse
Tryb pracy
Power supply
3.6V 1/2AA lithium battery
LCD, 7 x 8 mm
Communication Interface
no interface
Operating temperature
Protection class
IP 54 (front)
Case dimensions
48 x 24 x 42,4 mm
Data sheet
Manual EN
Declaration of conformity