These GSE 650 indicators control an Evacuation and Refill Cycle.
Each 650 utilizes two (2) timed outputs, and one (1) output based on weight.
(All the outputs are easily adjustable from the front panel.)
Each 650 has a counter which records how many 30 lb. tanks were filled.

Typical Sequence: Place tank on scale, hook-up tank, press <START>.
Scale tares weight of tank, opens valve #1 for X seconds to evacuate tank.
Valve #1 closes, Valve #2 opens, filling tank to Y pounds. Valve #2 closes,
System pauses...close tank valve, and press <ENTER>.
Valve #3 opens for Z seconds evacuating fill line.  Disconnect tank, Done.