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EMCO PITOBAR Averaging Pitot Tube for Larger Pipe Sizes
(Type PC 450, PC455)


The PITOBAR Averaging Pitot Tube is used to measure the flow of liquid and gasses in horizontal or vertical pipe lines. Its working principle  is derived from the classic or single point pitot tube. However, as opposed to the single point pitot tube, the PITOBAR Averaging Pitot Tube has a number of holes depending on pipe size pointing towards the upstream side. One port pointing downstream measures the static pressure. The main advantages of this flow element are its low installation costs and low pressure loss compared to other flow elements, especially in larger pipe sizes.




Design and calculation standards
VDE/VDI 2640, ASME, DIN, EN 13480
PC450 & PC455
Pipe sizes
DN 500 - DN 6000: 20" - 240"
Probe sizes
45 x 45 mm
Pressure rating
up to PN 100 (600lbs)
Temperature range
-100°C - +300 °C
Material PITOBAR
Stainless steel AISI 316, other stainless grades on request
Material mounting part
Carbon steel, stainless steel AISI 316, other on request
Process connection
Flange according to pressure rating
Flange standards
DIN, ANSI, others on request
Welding to the pipe
Instrument connection
½" BSP or NPT

Technical Data

± 1% accuracy of actual flow
± 0,1%
Reynolds no.
Minimum 100.000 at full flow
Max. fluid velocity
Liquids 5 m/s, gasses 80 m/s


Shut-off valves: needle or ball

Required Straight Pipe Lengths

Certain installation requirements for straight pipe lines must be fulfilled in order to achieve the most accurate flow measurement. See table below.

Upstream (x D)
Downstream (x D)
Single 90° bend
Two or more 90° bends in the same plane
Two or more 90° bends in in different planes


The PITOBAR Averaging Pitot Tube is constructed and designed with a diamond shaped strut with several ports spaced centrally within concentric rings of equal area pointing towards the upstream side. This is done in order to get the best averaging measurement of the dynamic pressure, resulting in a more
accurate flow reading. 
The pitot tube creates a differential pressure signal which is proportional to the flow rate: Differential Pressure = ( Pstatic + Pdynamic) – Pstatic.


For optimal installation, the pitot tube should be placed in a straight cylindrical pipe with consistent cross-sectional area and free from obstructions. The inner pipe diameter must not deviate by more than 0.3% for accurate differential pressure calculations. To ensure accurate measurements, it is recommended to use full bore valves upstream of the primary element. The inner pipe wall roughness should meet specific limits depending on the material used. For steam flow, a horizontal mounting with a 5-degree slope is advised to facilitate condensate flow. Purge connections are available for fluids with impurities, and regular maintenance is suggested to maintain accurate readings. For proper instrument connection, the differential pressure transmitter should be positioned below the pitot tube for liquid and steam flow, and above it for gas flow, with impulse lines sloped to allow air escape.

Download the installation guide above for more detailed information. 

Drawing of liquid flow measurement in horizontal pipe

Who to contact?

Christoffer Thrane
Sales & Marketing Manager


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