A timer is a specialized type of clock. A timer can be used to control the sequence of an event or process. Whereas a stopwatch counts upwards from zero for measuring elapsed time, a timer counts down from a specified time interval, like an hourglass. Timers can be mechanical, electromechanical, electronic (quartz), or even software as all modern computers include digital timers of one kind or another. When the set period expires some timers simply indicate so (e.g., by an audible signal), while others operate electrical switches, such as a time switch, which cuts electrical power.

TYPE	YS-720	YS -2000	YS-11
SUPPLY VOLTAGE	24-240VAC/DC 50/60HZ	110-240VAC/DC 50/60HZ	24-240VAC/DC 50/60HZ
ABSORPTION	4MA	4MA	4MA
OPERATING TEMP.	-40 -60	-10~55	-40-60
TIME ON	0.5-10 SEC	0.5-99 SEC	2 SEC
TIME OFF	0.5-45 MIN	0.5-99 MIN	0.5-120 MIN
CONNECTOR AND GASKET	DIN 4650A	DIN 43650A	DIN 43650B
CLASS PROTECTION	IP 65	IP 65	IP 65