Wednesday, August 31, 2016

Using a Valve Monitor for Tank Fill Control

Tank fill application
Tank fill application using a StoneL Axiom
to throttle flow.
Fill tanks and hoppers rapidly and accurately using the StoneL Axiom Expeditor valve monitor on a pneumatically operated valve.

You can set the Axiom Expeditor to partially close the valve to reduce flow as the full level approaches. You get fast, economical “topping off” of every batch with a single valve sized for high flow rates, which may be throttled back at the end of the fill cycle.

Simple operation and control system integration
  • Full open and closed cycling is performed by energizing and de-energizing the discrete 24 VDC output (DO) from the control system.
  • A preset intermediate position may be achieved by maintaining power from the discrete output (DO) and switching on the analog output (AO) at a preset level between 4 and 20 mA.
  • Intermediate control is achieved by maintaining power from the discrete output (DO) and energizing the control system’s analog output (AO). By changing the AO signal, the Axiom control output will toggle the solenoids to the desired position within ±4% of full scale.
  • The valve/actuator operates to the fail-safe position whenever the discrete output (DO) is de-energized.
Schematic for tank fill application
Schematic for tank fill application showing control inputs/outputs.
Watch this short video illustrating how the tank fill feature works.