Casella CEL Vortex personal sampling pumps - Manual (Page 7)

An alternative label design is provided should frequent access to the control
be desired.
2.6.1 Adjustment Technique
If the sample flow rate drops due to an increase in pressure loading, adjust
the “feedback” control with a trimming tool and increase the flow to slightly
above the desired flow rate. Reduce the flow back to the desired flow rate
using the front panel keys.
If an increase in the applied pressure loading causes the sample flow rate to
increase, decrease the flow to below the desired flow rate using the
“feedback” control. Increase the flow back to the desired flow rate using the
front panel keys.
Repeat the “feedback” adjustment procedure until the sample flow rate
remains constant over changes in the operating pressure.
An accessory kit is available to provide adjustable inlet pressure loading.
Please contact Casella CEL sales for further information.
2.7 Flow “Shut Down” Adjustment
The flow shut down is factory set to a level ensuring the sampler shuts down
if operated with an inlet blockage or beyond its designed operating envelope.
Adjustment of the shut down threshold may be required for operation at
higher flowrate or pressure drop conditions (for example, when the sampler
is used in conjunction with a, low flow constant pressure regulator).
Operation
Diagram showing the location of
the flow compensation control
potentiometer.
Feedback
Control
(USED
FOR
SETUP ON
Feedback
Control
(Used
during
Setup)
Page 7 of 16
VORTEX Standard 2 & VORTEX Timer 2
PERSONAL SAMPLING PUMPS Handbook