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Adjustable Length Insertation Paddlewheel Flow Meter

Adjustable Depth Insertion Paddlewheel Flow Sensors


Item# FP6501

In stock

Lead Time (If not in stock): 4 weeks
Adjustable Depth Insertion Paddlewheel Flow Sensors FP6501 FP6501
  • Available in 316 Stainless Steel or Brass
  • Installs in a Wide Range of Pipe Sizes From 3' to 40'
  • Excellent Low-Flow Performance
  • Special Fittings Not Required

FP6501 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Wetted Materials
Compatible Fittings
Pipe Size Range
Velocity Range
Max Process Temperature
Max Operating Pressure
Output Signal
Supply Power
Warning WARNING: This product can expose you to Lead, a chemical known to the State of California to cause Cancer and Reproductive Harm. For more information go to

  • Bearing Material Ruby ring
  • Maximum Ambient Temperature 93°C (200°F) at 0 psig
  • Maximum Pressure 14 bar (200 psi) at 24°C (75°F)
  • Shaft Material Nickel-bound Tungsten Carbide standard
  • Power 5 to 24 Vdc
Ruby bearings and a non-drag pick-off give these adjustable insertion flow sensors the widest flow range of any of the paddlewheel types. A Hall-effect device detects the passage of miniature magnets in the six rotor blades. The resulting square-wave signal can be sent hundreds of feet without a transmitter, over unshield cable. This signal can be connected directly to many PLCs and other controls without additional electronics.

A depth adjustment system allows two basic sizes to cover pipe sizes from 7.62 to 102 cm (3 to 40").

Compatible Meters:

  • DPF700
  • DPF70
  • DPF11
  • FC-21, 22

    Probe Body:
Brass or 316 SS
    Rotor: PVDF
    Shaft: Nickel-bound Tungsten Carbide standard, ceramic optional
    Bearings: FP6501/FP6502: Ruby ring, ruby end stone, set in PVDF bearing holder
                   FP6511/FP6512: Bronze Ball Valves standard, 316SS optional
    Power: 5 to 24 Vdc, 1.5 mA
Signal: Square wave, 11 Hz/fps (approx.), current sinking output, 20 mA maximum, NPN (Hall Effect)
Cable: #22 AWG 3-conductor, 6 m (18') standard; 650 m (2000') max
Accuracy: ±1.5% of full range
Range: 0.3 to 30 fps
Maximum Working Pressure: 14 bar (200 psi) at 24°C (75°F)
Maximum Temperature: 93°C (200°F) at 0 psig
Shipping Weight:
    FP6501: 1.8 kg (4 lb)
    FP6502: 2.3 kg (5 lb)
    FP6511: 5.9 kg (13 lb)
    FP6512: 6.8 kg (15 lb)
Pipe Size Range:
    FP6501/FP6511: 7.62 to 31 cm (3 to 12")
    FP6502/FP6512: 31 to 102 cm (12 to 40")
Fitting Size:
     FP6501/6502: 1½ MNPT
     FP6511/6512: 2 MNPT
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Repair kit (bearing assembly & rotor), PVDF
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