Multi-Process Station (3505)
The Multi-Process Station, Model 3505, consists of a 20-cm (8-inch) diameter, 92-cm (36-inch) high Plexiglass cylinder, a 10-cm (4-inch) diameter inner column for dual volume process characteristic, a pump, a diaphragm-actuated control valve, two pipe-mounted differential pressure (D/P) transmitters, and a current-to-pressure (I/P) converter. A microprocessor-based controller, a variable frequency AC drive, a dual-pen strip chart recorder, and two alarm lamps are also mounted on the main panel. A regulator needle valve controls air flow to a bubbler pipe for level measurement. In addition, at the base of the level column are two valved taps that permit connection of the D/P cell or optional manometers. A low-pressure gauge and a compound-pressure gauge are mounted on the side of the control cabinet. A pressure cap on the level process tank permits level controls of a pressurized vessel. A wet leg standpipe is also provided.