HP59B616 by Danaher

The HP59B616 is a reset timer manufactured by Danaher for use in the Timers and Controllers series. It provides adjustable time delays that coordinate start, dwell, or purge steps in automated packaging lines, furnaces, or pump stations. A synchronous-motor drive advances the dial mechanically, so the selected interval is unaffected by load variations or control-voltage ripple. This operation provides a straightforward way to synchronize subsystems without rewriting software.

The timer's power draw on the clutch circuit is 10.5 VA, which must be included when sizing control-transformer capacity. Its circular scale measures 7.85 in around the bezel, allowing fine visual resolution in cramped panels. Graduations are arranged in 10 min increments, and the hand can be positioned as low as 20 min from zero, enabling short dwell periods without companion electronics. At the upper end, the knob can be rotated to the full-scale limit of 10 hr. This range is suitable for extended soak, cure, or circulation cycles driven directly from mains power rather than PLC logic.

The output contacts are rated for a 5 A resistive load at 240 VAC, so the device can switch small heaters, solenoids, or auxiliary relays without an interposing contactor. Cycle-to-cycle variation is held within ±3 min, keeping multistage processes aligned over long production runs. After a timeout, the internal cam clears the circuit in only 0.5 sec, reducing the delay before the next batch can start. The synchronous drive operates at a line frequency of 60 Hz. With the specified 240 VAC supply and its +10/-15% tolerance, timing accuracy remains stable across common North American plant voltages. Fifteen screw terminals are provided in an ABS housing, and the knob-adjustable setting method requires no special tools. The accessible dial allows the timing interval to be changed directly at the panel without additional programming equipment.