Casella CEL Airborne bacteria sampler - Manual (Page 9)

sampling head and the speed of the pump. The resulting flow rate being
determined by the reading obtained on the vacuum gauge E.
Table 1 presents the combination of slit openings and readings on the
vacuum gauge (set by adjusting the pump speed control F on the pump unit,
see Figure 3), which correspond to a range of flow rates.
Table 1: Flow Rates
Number of
Slits Open
Reading on
Vacuum Gauge E
Flow Rate
(litres/minute)
- First thick line -
One First thin line 175
Two Second thin line 350
Three Third thin line 525
Four Last thick line 700
To undertake the determination of airborne bacteria, a suitable flow rate
should be selected from Table 1 above. The flow rate chosen will be
dependant on the expected level of airborne bacteria and the desired
sampling time.
Figure 3:The Pump Unit control panel
CASELLA
MADE IN
ENGLAND
L/MIN
HIGH LOW
Pump Speed Control
01066
Operation
Page 9 of 16
BACTERIA SAMPLER
User Manual