NFX Glass Tube Variable Area

The Nixon NFX Glass tube Variable Area Flowmeter is available in a full range of lengths and is available scaled for liquid or gas measurement. Customised scales match the meter to specific conditions.

There is a choice of three scale lengths for optimum readability or compact installation. Repeatability is better than 0.5% of reading to improve process control. An optional needle valve is available for precise control at reduced cost.

The tubes are removable from the frame for easy cleaning/ replacement. Angled or straight connections allow for flexible pipe layout. The meters can be simply mounted to reduce installation costs.

The instruments have a retained polycarbonate cover to ensure operator safety in the event of a breakage. The units are aesthetically styled to suit integration into original equipment. 

Technical Data

• Flow ranges: gas range 20 cc/min—115 l/min (air equivalent)
• Liquid ranges 2.0 cc/min-4.6 l/min (water equivalent)
• Scale length options - 140 mm / 100 mm / 30 mm
• Accuracy Class - % 1.6 / 2.5 / 4 VDI/VDE
• Temperature range - -15°C to +20°C
• Maximum pressure - 20 Bar Non shock
• Connections - Stainless Steel or Nickel plated brass
• 1/4” BSP Female
• Seals- Viton 
• Flow tube - Borosilicate glass
• Float- Stainless Steel, Anodised Aluminium

Principle/Application

Variable Area Flowmeter. Displacement of a float in a conical, Borosilicate glass tube.

Applications: Commonly used in industry to measure the flow for:

• Water treatment.
• Chemical processes.
• Industrial Refrigeration & Air Conditioning.
• Research Laboratories.
• Gas Burners.
• Pilot Plants.
• Annealing Furnaces.

Benefits

• Easy Installation, no straight pipe required.
• Low pressure drop.
• Scaled directly in l/h ,l/m, kg/h, %, mm, etc.
• Adjustable alarms, in all scales, operated magnetically or with infra-red light.
• Measuring tube in Borosilicate glass.
• Steel construction, coated with Polyamide 11.
• Connections in Steel, AISI-316, PVC & PTFE.

Advantages:

• Low/Medium flow of Liquids and Gasses
• Compact, Standard and long versions available
• Direct reading indication
• Optional Needle control Valves
• Custom scales
• Alarm and 4-20mA options