Small Volume Unidirectional Captive Displacement Prover



Flow Management Devices’ FMD 007 Unidirectional Captive Displacement Prover provides exceptional accuracy and rangeability. With standard 3” ANSI B16.5 flanges on both the inlet and outlet and a flow range capability of up to 700 GPM* (1,000 BPM, 150 M3/HR), and a 1200:1 turndown, this prover is an exceptional choice for your application.

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Max flow rate GPM BPH M3H
700 1000 150
Displaced Volume Gallons Liters
Primary Secondary Primary Secondary
5 4 20 6
Turndown Std Flange Size
1200:1 3” ANSI


  • Accuracy: < 0.02% - Exceeds API Standard
  • Performance: Exceeds 0.02% ISO17025 Calibration Lab
  • Uncertainty: Typically 0.021% (Water draw)
  • Pressure Drop: 5 psi at max flow rate of each prover (calculated with water)


  • Conforms to API 4.2 and API 4.6
  • Galvanized frame per ASTM A123/123M-02
  • Shock mounted isolation pads for independent drive and support
  • 3-point installation for secure mounting on uneven surfaces
  • 1” connection flanges for rapid draining
  • 1” vents with check thermowell and pressure verification ports
  • All wetted parts stainless/PTFE
  • Prover Interface Module (PIM) with advanced features
  • Smooth Belt Drive with clutch
  • Shock mounted Isolation Pads

Flow Management Devices’ goal is 100% customer satisfaction: therefore, we provide the following services at no charge.

  • Four year warranty for parts (seals and seal changes are not included)
  • Final Acceptance Testing Includes: Water Draw, Hydrostatic & Dielectric Test
  • Training in our facility during Final Acceptance Testing
  • Free crating per ISPM-15 (Stationary only)
  • One day onsite startup and training


  • ISO 9001/2008
  • ISO 17025
  • CSA/US Class 1 Div. 1
  • CRN
  • ATEX
  • GOST (Russia)
  • Kazakhstan Metrology

* When sizing a flow meter for this prover, the maximum flow rate should be less than or equal to the maximum rate of the prover. All the FMD Small Volume Provers can operate at the maximum flow rates as specified. Nominal flow rates should not exceed 80% of maximum, all application information should be verified with FMD and will vary due to the meter technology used in each application.

** Displace Liter Volume values are not a direct conversion from gallon values. Prover requires non-standard switch bar for liters.