The variable area flow meter is used to measure the flow rate of liquids and gases  and consists of vertically tapered tube through which the fluid to be measured is passed from smaller end of the taper and up to the larger end.  The fluid flow raises an indicator f(float) in the tapered tube increasing the area for passage of the fluid. The indicator moves up or down is in proportional to the fluid flow rate.  By varying the taper of the tube, the mass of the float, the length of the tube, different flow ranges can be calibrated. The standard turn-down ratio of this flow meter is about 10-to-1.  It has simple structure and cost effective and is widely used in various industry applications.  

Key Features 

• Polysulfone meter body resists high temperatures and pressures.
  
• 316 SS, PTFE or Hastelloy rod guided float
• Direct reading permanent scale.
• 1″ and 1-1/2″ Inline units.
• 1″ M/NPT panel mount units.
• 1″ F/NPT and 1″ sweat brass units.
• Not recommended for direct sunlight
• Available OEM options:  Private labeling, custom calibrations and custom materials.
• Available with 90˚ Adapters.
• Available with Polycarbonate Shield.
• Available with Brass Adapters. (see datasheet for details)

Model Variations: 

• LHNE = 90° Elbows for Panel Mount Installation (M/NPT all models but the F-451006 F/NPT)
• LHNC = Units with Polycarbonate Shield
• LHKN = In-line units specially equipped with Hastelloy C or PTFE float and guide rod depending on scale range.
• LHBPN = Units with Brass F/NPT Adapters
• LHBSN = Units with Brass Sweat Adapters

Typical Applications

• Ultra filtration equipment(reverse osmosis systems)
• Manufacturing and management of de-ionized water
• Commercial swimming pool industry
• Solar panel manufacturing and processing
• Water treatment systems   
• Coolant circulation