Casella CEL Vortex Ultraflow area sampling pump - Manual (Page 4)

2. OPERATION
Both designs utilise a twin diaphragm pump to reduce pulsations in airflow
and maintain high efficiency. Precise control of the sample flow rate is
achieved using a current proportional feed back technique.
Both pumps have similar front panels as shown below.
2.1 Battery
The battery is a sealed lead acid type, giving 7 Ah at 12 volts.
The run time is dependent upon flow and pressure conditions, for example:
Asbestos clearance
8 litres/min using a 0.8 µ, 25 mm filter the run time is typically
5 hours.
PM10/2.5
16.7 litres/min using a 47 mm GFA filter the run time is typically in
excess of 4 hours.
The charging socket is located at the back of the pump. Using the charger
provided, the battery can be fully charged in 12-14 hours. The three-stage
charger provided prevents overcharging.
To ensure maximum life expectancy of the battery pack, it is recommended
that the battery is not left in a fully discharged condition for extended periods
of time.
2.2 Battery Low Shutdown
A battery low cut-off facility will turn the pump off once the internal battery
pack becomes fully discharged. This will prevent “deep discharge” damage
Operation
Page 4 of 12
VORTEX Ultra Flow & Ultra Flow lite
SAMPLING PUMPS Handbook