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SearchDEED - Dekati® Engine Exhaust Diluter |
AccessoriesAccessories DEED-150 POST-DPF sampler If the particle number measurements are carried out according to the PMP protocol, the particle sample for the sample conditioning unit should be taken from a CVS tunnel. However, if there is no CVS tunnel available in the test cell, then the conditioning system must be connected directly to the tailpipe. The DEED-150 POST-DPF is designed to make the tailpipe connection easy and simple. The DEED-150 is most suitable for post-DPF condition where particle concentrations are low although it can also be used with vehicles without exhaust after-treatment devices. The schematic of the DEED-150 is presented in the figure below: The DEED-150 is connected to the tailpipe with a 10mm SwagelokTM and it uses a perforated probe to draw the sample from the tailpipe. The entire line from the tailpipe to the DEED inlet is heater to approximately 60 oC to avoid condensation of water. The temperature of the heated line if automatically controlled by the DEED system to an optimal value. The user does not need to adjust any operation parameters from the DEED system when using the DEED-150 post-dpf sampler. Specifications Dilution ratio N/A
When the DEED-150 post-dpf sampler is used, it is recommended to connect the DEED sample exhaust back into the tailpipe to avoid change in the dilution ratio due to pressure fluctuations.
The DEED-300 pre-dpf sampler enables connecting the DEED system to pre-dpf conditions where typically particle concentration, temperature and pressure are high. Due to its innovative design, the DEED-300 always keeps a constant total dilution ratio regardless of presure and temperature conditions inside the tailpipe. The DEED-300 increases the total dilution ratio of the DEED system by two additional dilution stages. Additional dilution ensures that the particle concentration in the DEED outlet is below 10000 particles/cc even when sampling from high pre-dpf particle concentrations. The DEED-300 schematic is shown in the figure below: The DEED-300 uses a small orifice to sample exhaust from pre-dpf conditions. A part of the sample is lead to a mini-CVS axial diluter while the excess raw exhaust is lead to a local exhaust. The sampling probe is heated with automatic heater control from the DEED system. The sample is drawn from the mini-CVS to the DI-1000 Dekati® ejector diluter where it is further diluted and then led into the DEED system. The exhaust from the DI-1000 and the DEED system should also be led into a local ventilation system. Specifications Dilution ratio Constant at approx. 40 (individually calibrated)
Although the DEED system does not need any external commands for operation, it can be controlled via an AK-protocol compliant commands with the DEED-900 software package. The DEED-900 software is easy to install and it enables the user to use AK commands to set the heater setpoints, select high/low dilution ratio and to the check the operation conditions/error messages.
FPS-4001 Pressurised air filtration and drying unit When aerosol from a combustion source is diluted, it is important that the dilution air is dry and particle free. FPS-4001, the pressurized air drying and filtration unit can be used to condition the pressurized air according to our standards. Importance of conditioning dilution air Humidity in the dilution air can cause several problem in the measurement. If humidity is high enough, condensation may occur inside instruments causing unpredictable problems. In addition, the DEED system flow are calibrated with dry air and therefore humidity can some differences compared to calibrated values. If dilution air contains particles, they are directly seen as background concentration in the particle measurement. This is especially important when doing low concentration combustion measurements such as exhaust measurements after a DPF. Specifications
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