Casella CEL Vortex Ultraflow area sampling pump User Manual

Page 6

2.5

Flow Adjustment

Adjust the pump flow to the desired rate while the pump is running.

Press the FLOW key for 3 seconds, the green PUMP ON LED will

flash.

Temporarily release the key, the green LED will continue to flash

while the pump is in this mode.

Adjust the flow rate, either up or down, by holding down the

appropriate key, the adjustment is slow to start then picks up speed.

If there is no key press after 4 seconds, the pump will return to

normal run mode and the green PUMP ON LED will stop flashing.

For optimum stability of flow, it may be necessary to allow the pump to run

for a few minutes before use.

2.6

Flow Compensation

Both versions of the Ultra Flow are factory calibrated to maintain stable flow

at 8 litres/min. At different flow rates it may be necessary to adjust the front

panel CAL control to ensure stable flow rate over varying pressure

conditions.

If the flow drops as pressure increases, increase the flow using the CAL

adjustment and then reduce the flow back to the desired flow rate using the

front panel keys.

If an increase in applied pressure drop causes the sample flow rate to

increase, decrease the flow using the CAL adjustment and then increase

the flow back to the desired flow rate using the front panel, up/down, keys.

Repeat the CAL adjustments until the sample flow rate remains constant

over the operating pressure range.

2.7

Flow “Shut Down” Adjustment

Sometimes it is necessary to adjust the flow shut down level to suit the

sampling flow rate and pressure drop conditions.

With the pump switched off, undo the four retaining screws and

remove the lid.

Adjust the potentiometer VR2, in the middle at the bottom of the

circuit board (see figure opposite), fully clockwise, until it clicks.

Operation

Page 6 of 12

VORTEX Ultra Flow & Ultra Flow lite

SAMPLING PUMPS Handbook