Available scale sizes depending on your flow rate
The table below will help you see the available scale sizes for your specified flow rate requirement. Use the dropdown above once you have found the scale size you require.
|Flow rates||Scale size|
|Air||70 SLPH – 100SLPM / 2.6 SCFH – 4 SCFM||50mm (2 inch)|
|110 SLPM – 650SLPM / 4 SCFM – 23 SCFM||75mm (3 inch)|
|20 SLPM – 620 SLPM / 42 SCFH – 22 SCFM||127mm (5 inch)|
|18 – 28 LPS / 40 SCFM – 60 SCFM||100mm (4 inch)|
|220 SLPM – 19 SLPS / 8 SCFM – 42 SCFM||250mm (10 inch)|
|Water||26 LPH – 410 LPH / 7 GPH – 75 GPH||50mm (2 inch)|
|3.5 LPM – 18 LPM / 1 GPM – 5 GPM||75mm (3 inch)|
|37 LPH – 18 LPM / 10 GPH – 5 GPM||127mm (5 inch)|
|37 LPM – 75 LPM / 10 GPM – 20 GPM||100mm (4 inch)|
|7 LPM – 37 LPM / 2 GPM – 10 GPM||250mm (10 inch)|
Options help guide: Choosing the correct Rotameter options
Air or Water
Choose your desired liquid or gas compatibility, note these are standard scales for water or air.
We can adjust the scales for different liquids and gases, please consult us if your requirements are for other liquids or gases.
Flow rate + Scale size
Choose you desired maximum flow rate for the flow meter.
For Air models this will either be Standard Cubic Feet per Minute (SCFM) or per Hour (SCFH) for imperial scales or Standard Litres per Second (SLPS) or Minute (SLPM) for metric scales.
For Water models this will either be US Gallons per Minute (GPM) or per hour (GPH) for imperial scales or Litres per Minute (LPM) or Hour (LPH) for metric scales.
Note that generally the higher the flow rate then the lager the scale length. Scales are available in either 2”, 3”, 4”, 5” or 10”.
Dependant on your piping requirements the fitting materials available for the process connections are either Brass, PVC or 316L stainless steel. Please note PVC fittings is not available with some Air flow meters
Dependant on your gas or liquid compatibility requirements our flow meters come available as standard with a choice of EPR, Buna-N or Viton O-Ring’s.
The King 7520 and 7530 series are an economical machined cast acrylic block rotameter with an optional flow control valve on the inlet.
All internal components of the King rotameter are 316L stainless steel with a standing fitting material of PVC with 316L stainless steel and brass an option. Fittings are available in female NPT with some models offering a male NPT, all via a horizontal connection.
EPR O-Rings are standard with an option of Buna N or Viton®.
A flow control valve is available on the flow inlet of the flowmeter, the valve is available in brass or 316L stainless steel for any King flow meter in the 7530 series.
Flow scales are available in fives sizes with a choice of 50mm, 65mm, 100mm, 127mm and 250mm.
All models have a 10:1 turndown ratio with accuracy varying from ± 2% to ± 6% of full scale flow dependant on flow scale size.
Repeatability also varies by flow scale size, from 0.5% to 3%.
Maximum temperatures are up to 54°C for liquid models and 38°C for gas models. Operating pressures available up to 8.6 bar.
Liquid models are available with full scale flows from 0.45 litres per minute to 76 LPM.
Gas models are available with full scale flows from 2.6 standard cubic feet per hour to 60 SCFM.
Scales are available in any volumetric unit across the 7520 and 7530 series of flow meter by King Instruments.
- Precision Machined Acrylic Flow Meter
- Block Type, Panel Mountable
- Horizontal Connections with Optional Metering Valve
- Suitable for OEM applications
- Air and Water models available