The Series 51 timer is a precise adjustable time delay control device. The timer is available with either an on delay (NC) or off delay (NO) 3 way built in valve. It is designed for mounting along with valving or other logic devices and is available with 10-32 (M5) or 1/8" NPT ports.

Timing operation can be set up in 2 ways; timed either via direct connection of the pressure line to be time (1/8" NPT Ported only) or via a separate pilot signal. When pressure is applied to the input line (or pilot port) the timing sequence begins by setting a vacuum within the timer. Using atmospheric pressure (independent of line pressure), the timer begins the preset timing cycle. At the end of the cycle an internal 3 way valve is switched providing an output. The timer resets automatically after removal of the control signal.