Common use of Determination of the particulates Clause in Contracts

Determination of the particulates. The determination of the particulates requires a dilution system. Dilution may be accomplished by a partial flow dilution system or a full flow dilution system. The flow capacity of the dilution system shall be large enough to completely eliminate water condensation in the dilution and sampling systems, and maintain the temperature of the diluted exhaust gas at or below 325K (52°C) immediately upstream of the filter holders. De-humidifying the dilution air before entering the dilution system is permitted, if the air humidity is high. Dilution air pre-heating above the temperature limit of 303K (30°C) is recommended, if the ambient temperature is below 293K (20°C). However, the diluted air temperature must not exceed 325K (52°C) prior to the introduction of the exhaust in the dilution tunnel. For a partial flow dilution system, the particulate sampling probe must be fitted close to and upstream of the gaseous probe as defined in paragraph 4.4. and in accordance with annex 4, appendix 4, paragraph 1.2.1.1., figures 4-12, EP and SP. 2.1.1.). To determine the mass of the particulates, a particulate sampling system, particulate sampling filters, a microgram balance and a temperature and humidity controlled weighing chamber are required. For particulate sampling, two methods may be applied: the individual modes of the test cycle. This method allows more lenient sample procedures but uses more filters.

Determination of the particulates. The determination of the particulates requires a dilution system. Dilution may be accomplished by a partial flow dilution system or a full flow dilution system. The flow capacity of the dilution system shall be large enough to completely eliminate water condensation in the dilution and sampling systems, and maintain the temperature of the diluted exhaust gas at or below 325K (5252 °C) immediately upstream of the filter holders. De-humidifying the dilution air before entering the dilution system is permitted, if the air humidity is high. Dilution air pre-heating above the temperature limit of 303K (3030 °C) is recommended, if the ambient temperature is below 293K (2020 °C). However, the diluted air temperature must not exceed 325K (5252 °C) prior to the introduction of the exhaust in the dilution tunnel. For a partial flow dilution system, the particulate sampling probe must be fitted close to and upstream of the gaseous probe as defined in paragraph 4.4. and in accordance with annex Annex 4, appendix Appendix 4, paragraph 1.2.1.1., figures 4-12, EP and SP. 2.1.1.). To determine the mass of the particulates, a particulate sampling system, particulate sampling filters, a microgram balance and a temperature and humidity controlled weighing chamber are required. For particulate sampling, two methods may be applied: paid to sampling times and flows during the individual modes sampling phase of the test. However, only one pair of filters will be required for the test cycle. This method allows more lenient sample procedures but uses more filters.