SCHEDULE 5(ANNEX V to Directive 97/68/EC)ANALYTICAL AND SAMPLING SYSTEM
Figure 12Partial flow dilution system with flow control and fractional sampling
— PSP particulate sampling probe (Figures 4, 5, 6, 8, 9, 10 and 12)
The probe is the leading section of PTT and
shall be installed facing upstream at a point where the dilution air and exhaust gas are well mixed, ie on the dilution tunnel DT centre-line of the dilution systems approximately 10 tunnel diameters downstream of the point where the exhaust enters the dilution tunnel,
shall be 12 mm in minimum inside diameter,
may be heated to no greater than 325 K (52°C) wall temperature by direct heating or by dilution air pre-heating, provided the air temperature does not exceed 325 K (52°C) prior to the introduction of the exhaust in the dilution tunnel,
may be insulated.