Welcome to DG Instruments About Us

For all your instrumentation requirements Shop Products

Meister Flow Switch Monitor for Liquids with Glass Indicator – RVO/U-4 - Low Ranges


The Meister RVO/U-4 Flow Switch Monitor is designed to be mounted inline in your pipework, to provide a switch point at your specific flow rate. These Flow Switches are ideal for small pipes where Vane Type Flow Switches aren’t practical to fit. The Flow Switch Monitors operate on a Float measuring principal and can be installed in any orientation. 

The RVO/U-4 Series are an In-Line Flow Switch with a glass indicating window, only suitable for water and compatible liquids.  We have other models for air/gas and oils.  


  • Applications include but not limited to, Safety Showers, Cooling Circuits
  • Solid Body Construction, compact In-Line; Adjustable Switch Point
  • ¼” Port Connections; Brass or Stainless Body material
  • Glass window feature limits both bodies to 16 BAR pressure
  • Ranges for liquids from 0.005 up to 5 LPM (water)
  • Normally Open (SPST) or Change-Over Contact (SPDT) Output
  • Options include: EX-Proof to ATEX; High Temperature

Payment & Security

Payment methods

  • Apple Pay
  • Google Pay
  • Mastercard
  • Shop Pay
  • Union Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.