Positive Displacement Meter

Positive Displacement meters, commonly known as PD meters, are a type of mechanical meter that has been widely used for decades. The volumetric flow rate is measured by dividing the media into fixed, metered volumes. A good analogy would be holding a bucket below a tap, filling it to a set level, then quickly replacing it with another bucket and timing the rate at which the buckets are filled. In this way, the number of ‘buckets’ filled determine the totalizer flow value and the rate at which the ‘buckets’ are filled determine the flow rate.



Max Min Temperature (°C)






Max Capacity kg/h

Body and Cover Material

Secondary Pressure Range

Type of Trap

Glass O.D / Length

Pipe Size


Positive Displacement Flowmeter

Positive Displacement Meter


    Our positive displacement meters are suitable for sizes from 6mm – 200mm (1/4” – 8”). Common applications are measuring the flow of water, oil or flammable liquids. This is because no external energy is needed, therefore there is zero fire risk. Both flow rate and a resettable totalizer value can be recorded. It can also be installed in compact spaces as no straight runs are needed. This is the reason why today, despite advances in technology, PD meters are still widely used and trusted for their reliability. 

    TekFlow’s Series PD Positive Displacement Meter

    Technical Specifications

    Accuracy: ±1.5% gases and steam
    Construction material: AISI 316 or AISI 304 stainless steel (Transmitter: Epoxy coated alumunium)
    Connections: Available in-line or wafer type 25 – 300mm (1” – 12”), insertion type 250 – 2000mm (10” – 80”)
    Pressure: Up to 420 barg
    Temperature: Up to 350ºC
    Turndown ratio: Between 10 : 1 to 40 : 1, depending on media
    Power Supply: 12 – 24V dc
    Intrinsically safe certified to Ex ib IIC T4, Flameproof to Ex d IIB T4
    Outputs: scaled pulse, 4 – 20mA, RS 485, HART protocol options
    Multivariable display: 7 digit LCD for instantaneous display, 8 digit for accumulated totals, Totalised gas mass flow, totalised standard or normal volumetric flow, standard or normal volumetric or mass flow rate, temperature, pressure

    Click here to download the full specifications.