Dirty Air Pitot Laser (DAPL).

What’s the benefit?

The Dirty Air Pitot Laser (DAPL):

  • Is cost efficient and a portable equipment which is easy to use and fast to install espicially in the SL version.
  • Can be used as a stand alone unit or in numerous pipes.
  • Provides the operator with information that enable optimization of the combustion process, thus reducing emissions and fuel consumption.
  • When used together with the PFSA, the data is automatically transferred to the control unit via Bluetooth.

What does it do?

The Dirty Air Pitot Laser (DAPL) is a portable instrument designed to measure the temperature, pressure and flow velocity in fuel pipes or duct systems transporting a mixture of air and pulverized coal or biomass as well as cement, lime or food product or other particles. The DAPL has a built-in laser pointer for distance measurements which is needed in order to obtain the correct data for the full flow velocity profile.

The DAPL can work as a stand alone unit and provide data to the operator or alternativly with M&W PFS or PFSA to ensure optimal measurements. Furthermore, the DAPL can transfer the data to the PFSA via Bluetooth.


How does it do it?

The DAPL is inserted into the fuel pipe through a Dustless Connection (DC). The DAPL is outfitted with a laser distance indicator, which are needed in order to obtain data for the full flow-velocity profile of the pipe. The data produced can be used in the PFS or PFSA, enabling isokinetic (i.e. representative) sampling of the fuel pipe. If Bluetooth technology is installed in the corresponding PFS/PFSA data can be transferred via Bluetooth and thus several manual tasks are eliminated.

When the DAPL is inserted into the pipe, it is positioned all the way into the fuel pipe, and slowly dragged out while it is performing the measurements. The DAPL 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 find the flow-velocity.

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


What are the technical details?

The DAP-BL-SL is inserted into the fuel pipe using the Snap-Lock method. It is positioned all the way into the fuel pipe, and slowly dragged out while it is performing measurements. The results are used to calculate the flow velocity profile for the whole fuel pipe. The laser is used to determine very precisely the relative position of the probe inside the fuel pipe.

Application: Gas velocity / differential pressure and temperature measurement
Instrumentation: Digital manometer / thermometer
Pipe dimension: < 2000 mm diameter
Power supply: 9V battery
Operation temp.: Max 100C
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: DC/DC-SL


1. The DAPL can be delived with a Snap Lock Dustless Connectior (DAPL-SL). This technology has been developed by M&W in order to save time for the customer and provide an easy way to secure a connection between the fuel pipe and measuring instrument. The design enables insertion of the measuring instrument into the fuel pipe with internal over-pressure which reduces leakage of coal-dust and provides a gas tight sealing.