Basic Level Applications

#5 – Inventory Management

Inventory monitoring by continuous level feedback to a local display depicting volumetric measurement.

• Goal: Know how much liquid is in the tank.
• Requirements: The system requires three components
  • Transmitter
  • Display
  • 24 VDC power supply
• Display Controller Options
  • PLC
  • SCADA
  • DCS
• Display Location
  • Next to tank
  • Remotely in control room
  • Both
• Displays with Relays Can Control
  • Alarms for high and low
  • Pumps & valves for automatic control functions
• Interfacing: To span the output for interfacing to an actuated valve or VFD, use a display with a 4-20mA repeater output.

Bonus

#6 – Combine Inventory Management with Alarm or Auto Fill/Empty

Combining a transmitter with a local display with relays adds high alarms, low alarms, auto-fill, or auto-empty applications to inventory monitoring.

• Goal: Directly controls pumps, valves, or alarms and monitors how much liquid is in the tank.
• Display Options: Choose a display that is powered from 120/240 VAC or 24 VDC.
  • 120/240 VAC
    • Systems typically have a 24 VDC power supply and require a transmitter and display only.
    • Add 2 or 4 relays (3A) to directly switch most alarms and valves.
  • 24 VDC
    • Systems require a transmitter, display, and separate 24 VDC power supply.
    • Add 2 relays (1 A) to directly switch most alarms (audible and visual).
  • Display Location
    • Next to tank
    • Remotely in control room
    • Both
  • Repeater Output Options
    • Interface to an actuated valve or VFD
    • Continue the 4-20mA signal to a central controller (PLC, SCADA, DCS, etc.).