Dirty Air Pitot (DAP).

What’s the benefit?

The Dirty Air Pitot (DAP):

  • The DAP establishes the flow velocity in pipes/ducts and provides operator with data to balance flows and avoid particle drop-outs due to low flow velocity
  • For power plants: Provides the operator with information to optimise the combustion process, thus reducing emissions and fuel consumption
  • Can be used as a stand-alone unit and in numerous pipes
  • Is a cost efficient and a portable equipment which is easy to use and fast to install espicially in the Snap Lock version.

See other of Mark & Wedell JAWO Sampling’s innovative extraction samplers and online analysers here:

DAP Product Brochure.

To find out more about our Dirty Air Pitot (DAP) please feel
free to download product brochure:


Link to brochure

Bjarke Pålsson (BP)

Bjarke Pålsson

Co-CEO & Owner

What does it do?

The Dirty Air Pitot (DAP) is a portable instrument designed to measure the flow-velocity, temperature and dynamic pressure in pipes or duct systems which pneumatically transport a mixture of air and particles such as pulverized coal or biomass, cement, lime or other particles of similar size.

The DAP can work as a stand-alone unit and provide data to the operator or alternatively in combination with the M&W PFS or PFSA to ensure optimal measurements.

How does it do it?

The DAP is inserted into the pipe through a Dustless Connection (DuC). The DAP is outfitted with a distance indicator, which is needed in order to obtain data for the full flow-velocity profile of the pipe.

The data produced can be used independently or in combination with the M&W PFS or PFSA enabling isokinetic sampling of the fuel pipe.

When the DAP is inserted into the pipe, it is positioned all the way into the pipe, and slowly dragged out while performing the measurements. The DAP measures the pressure difference between the upstream and downstream face of the probe. The downstream pressure corresponds to the static pressure and the upstream pressure corresponds to the stagnation pressure of the flow. The difference between these pressures can be used to estimate the flow-velocity

By performing measurements across the full cross-section of the pipe, the full flow-velocity profile can be obtained. The DAP has distance indicators, which allow the operator to manually read the measurements.

What are the technical details?

Application: Gas velocity / differential pressure and temperature measurement

Instrumentation: Digital manometer / thermometer

Pipe dimension: < 2000 mm diameter

Power supply: 9V battery

Operation temp.: Max 100C

Material: Stainless steel / aluminium / brass

Weight: 4 kg

Humidity: 0 – 95% (no condensing)

Compressed air req.: Min. 6 bar clean and oil-free air

Accessories: DuC/DuC-SL


  1. The DAP can be delivered with a Dust Connection (DuC)  or a Dust Connection Snap Lock (DuC-SL). This technology has been developed by M&W in order to save time and provide an easy way to secure a connection between the pipe and measuring instrument. The design enables insertion of the measuring instrument into the pipe with internal over-pressure which reduces leakage of dust and provides a gas tight sealing.

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