HF  Flow Meters

VFF HF FL DM 127
VFF HF FL DM 131
VFF HF HUB DM 186
VFF HF HUB DM 185
VFF HF TH DM 137
VFF HF TH DM 138
VFF HF WF DM 124
VFF HF WF DM 120
VFF VFF WF DM 323

Information about the VFF meter

Positive displacement flowmeters, also known as PD meters, measure volumes of fluid flowing through by counting repeatedly the filling and discharging of known fixed volumes. A typical positive displacement flowmeter comprises a chamber that obstructs the flow. Inside the chamber, a rotating/reciprocating mechanical unit is placed to create fixed-volume discrete parcels from the passing fluid.

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In the VFF the rotor is basically a disc shape with an annular groove on its underside capable of holding and transporting flow from the chamber inlet to the outlet. Some fluid is also transported in a cavity formed between the rotor outside wall and the chamber wall. A centre ‘peg’ under the rotor is constrained to run in a circular groove in the body. A web (or plate) in the body is engaged with a slot in the rotor and this modifies the rotation to that of an oscillation as flow passes. It is this oscillation that produces the compartmentation of the fluid into ‘positively displaced pockets’. The top of the rotor is equipped with a powerful magnet directly above the ‘peg’ that is on the underside and so this also has a circular path which allows it to engage and disengage a reed switch sensor located in the top cap above.

HF20, HF40 & HF60

The HF range started in 1998 with the HF20 using a graphite rotor rated to 20 l/min. The HF40 and 60 were added to double and triple the flow range up to 40 and 60 litres per minute. Materials now include stainless steel and titanium.

Typical Applications

Chemical InjectionHydraulicsWax Dispersant
Corrosion InhibitorMethanolPIB
Scale InhibitorSubsea flowAshalphtene Dispersant
  • TECHNICAL
  • FLOW RATE
  • CONNECTION
  • MATERIAL
  • DISPLAY
  • DOWNLOADS
  • ENQUIRE NOW

Key Features

CompactSingle Moving PartPressure independent measurement
No straight lengthsLarge Viscosity range, from methanol upwardsUltra High Pressure Capability (20,000psi, 1380bar if required)
Very Low Flow MeasurementMeasures pulsing flow accuratelyLow Maintenance
Tolerant of particulate up to 100+ micronsPreserves Molecular Integrity of fluidHighly Durable
Low pressure drop (<0.1 bar typical)Proven since 1986 

Technical Specifications HF range

Flow ranges

HF200-20 l/minMore detail in FLOW RATE tab
HF400-40 l/minMore detail in FLOW RATE tab
HF600-60 l/minMore detail in FLOW RATE tab
Accuracy±1% of reading, requires linearisation.Provided by all Litre Meter instrumentation.
Pressure RatingDependent on Connection size and ratingMore detail in CONNECTION tab
Temperature rating-40°C - +100°C dependent on material and instrument; higher temperature possible. 
Viscosity Range0.5 - 100,000 cP or greater.More detail in FLOW RATE tab
Recommended FiltrationA 100 micron filter is advisable for 100% long life serviceability. 
DimensionsRefer to K0004 drawings Link in DOWNLOADS tab 

 The HF20 and HF40 chambers are interchangeable, but the HF60 is considerably deeper

Pressure Balanced Chamber (PBC)

This describes the rotor and the chamber in which it rotates. It's a separate item that can be removed for inspection and calibration. A side benefit is that it enables pressure independent measurement.

Key Benefits:

No distortion of the chamber at higher pressures
No measurement inaccuracy due to pressure
Enables selection of optimal materials for the chamber to match the rotor i.e. PVD coated stainless steel.
Enables selection of optimal materials for the pressure vessel. i.e. super duplex stainless steel
Enables construction of a duplex bodied flowmeter – duplex material does not lend itself to the tolerances required in machining

All VFF flowmeters are custom calibrated across the customer specified min – max flow conditions and working viscosity. The minimum flow rates achievable are dependent on fluid viscosity.

Flow Ranges and viscosity

  

Minimum Flow Rate Measurable at Viscosity, L/min

  1 cP1.5 cP2.5 cP7.5 cP10 cP25 cP50 cP250 cP
HF20-20 L/min MaxStandard210.330.270.20.160.130.1
 Low Flow1.30.70.220.180.130.110.080.07
          
HF40-40 L/min MaxStandard420.660.530.40.330.250.2
 Low Flow2.51.40.440.350.270.220.170.13
          
HF60-60 L/min MaxStandard630.990.80.60.490.380.3
 Low Flow3.82.10.660.530.40.330.250.2

Standard Connections

Threaded

Pressure Rating, barDescription
5003/4 inch female NPT
3601 inch female NPT
13803/4″ Autoclave Engineers Medium Pressure female fitting (SF750CX20)
13801″ Autoclave Engineers Medium Pressure female fitting (SF1000CX20)

Wafer

RF, Raised Face

Flange RatingNominal Pipe Size
ANSI 1503/4″, 1″, 1 1/4″, 1 1/2″ or 2″
ANSI 3003/4″, 1″, 1 1/4″, 1 1/2″ or 2″
ANSI 6003/4″, 1″, 1 1/4″, 1 1/2″ or 2″
ANSI 15003/4″, 1″, 1 1/4″, 1 1/2″ or 2″
ANSI 25003/4″, 1″, 1 1/4″, 1 1/2″ or 2″

RTJ, Ring Type Joint

Flange RatingNominal Pipe Size
ANSI 1501″, 1 1/4″, 1 1/2″ or 2″
ANSI 3003/4″, 1″, 1 1/4″, 1 1/2″ or 2″
ANSI 6003/4″, 1″, 1 1/4″, 1 1/2″ or 2″
ANSI 15003/4″, 1″, 1 1/4″, 1 1/2″ or 2″
ANSI 25003/4″, 1″, 1 1/4″, 1 1/2″ or 2″

Hub

Graylock

Techlok, Galperti, Destec upon request

Higher pressure ratings achievable with F51

Custom: Call for further options

‘Flanged’: Call for further options

ANSI 10,000: Call for further options

Pressure Rating, barDescription
7061GR4 Grayloc Hub Connection
6561GR5 Grayloc Hub Connection
4961GR7 Grayloc Hub Connection
2901GR11 Grayloc Hub Connection
6161.5GR11 Grayloc Hub Connection
3951.5GR14 Grayloc Hub Connection
approval required by hub vendor2GR11 Grayloc Hub Connection
5462GR14 Grayloc Hub Connection
3162GR20 Grayloc Hub Connection

 

Materials Coding Body and Cap

CodeMaterial
SS316 Stainless Steel (UNS S31603)
44F44 6Mo SS Body & Cap (UNS S31254)
51F51 Duplex Body (UNS S31803) & F44  Cap (UNS S31254)
53F53 Super Duplex Body (UNS S32750) & F44 Cap (UNS S31254)
55F55 Super Duplex Body (UNS S32760) & F44 Cap (UNS S31254)
HAHastelloy Body & Cap (UNS N10276)
TITitanium (UNS R50400)
CodeManufacturing Method
BBBody ‐ Not Forged / Cap ‐ Not Forged
FBBody ‐ Forged / Cap ‐ Not Forged
FFBody ‐ Forged / Cap ‐ Forged
CSCustom Specification

 Materials Coding Chamber & Rotor

CodeChamberLidC/L CoatingRotorR CoatingMagnetDescription
APN60N60PVDN60PVDEncapsulated 316PVD Coated N60 Chamber and Rotor
TATi 5Ti 5PVDTi 5PVDEncapsulated TiPVD Coated Titanium Chamber and Rotor
TCTi 2Ti 2noneCarbonnoneEncapsulated TiTitanium Chamber and Carbon Graphite Rotor

Call for further options

Materials Coding Seals

CodeMaterial
VViton
NNitrile
PPTFE Encapsulated Viton
EEPDM
NAEDNitrile non explosive NBR
KKalrez

CH

Chemraz
MVInconel/Viton
MPInconel/PTFE Encapsulated Viton
MKInconel/Kalrez
MCHInconel/Chemraz
MNInconel/Nitrile
MEInconel/EPDM

    Call for further options

Display for VFF meters

FlowPod

  • Exd‐ CSA(US): Class1 Div1 (B,C,D); Class 1, Zone 1, AEx d IIC T5 Gb
  • CSA(CAN): Class1 Div1 (B,C,D), Exd IIC T5 Gb, Tamb -20°C to +75°C
  • ATEX: Ex db IIC T5, Ex tb IIIC 80°C
  • IECEX: Ex db IIC T5, Ex tb IIIC 80°C
  • IP 66/IP68 dual certified
  • Ambient temperature: ‐20 to +75°C
  • 2 or 4 wire 4‐20mA HART 7 programming and monitoring
  • Compact lightweight 316 stainless steel housing
  • Rotatable through 360° for optimised viewing angle
  • 2 VFF sensing options ‐ standard and hi‐res ‐ both with bidirectional sensing
  • Removable LM‐MC storage card for data logging & offsite programming
  • Resettable and non‐resettable Totaliser
  • Batch control
  • Power: 12 – 30 Vdc

Fluidwell

  • Safe area or ATEX / IECEX / FM / CSA Exia
  • 2 wire 4‐20mA HART output (HART is optional)
  • Material: GRP or Aluminium
  • IP 67
  • Ambient temperature: ‐40 to +70°C
  • Rotatable through 360° for optimised viewing angle
  • Resettable and non‐resettable Totaliser
  • Batch control
  • Power: 12 – 30 Vdc, Battery or Loop powered

VRGS

  • Safe area or ATEX II 2G Ex ia IIC T4 Gb
  • 2 wire 4‐20mA HART output (HART is optional)
  • Material: 316 SS
  • IP 66/IP67
  • Ambient temperature: ‐40 to +120°C
  • Rotatable through 360° for optimised viewing angle
  • Resettable and non‐resettable Totaliser
  • Power: 15 – 30 Vdc,can be Loop powered

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