An hour meter, also called an hour counter or hours run meter, records how long a machine or piece of equipment has been running. It counts time whenever voltage is applied, giving a reliable basis for service intervals and warranty records on pumps, compressors, generators and production machines. Non-resettable models keep the total for the life of the equipment.<\/p>\n
SCN supplies two types. The Tele Haase TBW \/ TBG hour meters<\/a> are 17.5 mm DIN-rail modules for control cabinets: they count up to 99,999 hours with a resolution of 0.01 h, the TBW for 24\u2013230 V AC and the TBG for 12\u201348 V DC, and they draw only 0.15 W. For aircraft, military vehicles and other severe environments, the Petercem CM5200<\/a> is an analogue elapsed time indicator rated for -55 \u00b0C to +125 \u00b0C, 100 G shock and 10\u201334 V DC, in several mounting variants; see Elapsed time indicators Aero & Defence<\/a>. To control or supervise the same machines, see timing relays<\/a> and monitoring relays<\/a>, or browse all components<\/a>.<\/p>\n How to choose:<\/strong> start with the supply voltage: AC from the mains (TBW) or DC from a battery or 24 V control circuit (TBG or CM5200). Then decide on mounting \u2013 DIN rail in a cabinet, or panel, partition or lug mounting in a vehicle or instrument panel. Check temperature, shock and vibration, and finally display range and resolution.<\/p>\n An hour meter counts time only while voltage is present at its terminals. It is typically connected in parallel with the load, or to a circuit that is live only while the machine runs, so the reading equals actual running time. The TBW \/ TBG has a reading resolution of 0.01 h, while the CM5200 is an analogue elapsed time indicator with no zero return.<\/p><\/details>\nFrequently asked questions<\/h3>\n
How does an hour meter work?<\/summary>