29
DPM-RT-2 Operating Manual
Notes:
1.
It is important that the timing of the idle and full throttle settings is as accurate as possible. To ensure
good repeatability, it is advisable for the operator to practice the procedure several times prior to
collecting a sample.
2.
Sampling should commence in the first idle period and continue until the final idle period.
3.
Engines with a constant load, such as a diesel generator or pump should be analysed with the load
applied over the full 60 seconds.
i)
Start sampling timer on analyser.
j)
After 20 seconds have an operator quickly apply full throttle to engine (still in third gear) and hold for
20 seconds.
k)
Quickly release throttle and allow engine to decay to idle while sampling for 20 seconds.
l)
Stop sampling timer on analyser.
m)
The total sampling time is 60 seconds. The sampling must pick up rise and decay of the engine from
idle to full throttle and return to idle.
n)
Remove the probe if no further testing is required.
o)
Record the mean (average) engine exhaust diesel particulate concentration in (mg/m
3
).
Figure 1
–
Diesel particulate load cycle
–
Standard method
6.3.2.2 Alternative Method
Where testing in accordance with clause 6.3.2.1 above is not practicable (such as engines fitted with manual
clutches) diesel particulate testing of the undiluted raw exhaust of diesel engines shall be carried out as
follows:
