Copyright 2018, InnovaPrep LLC
Patented
https://www.innovaprep.com/patents
26
Flow Start
determines the flow sensor sensitivity needed to establish liquid “flow” on the CP. As the liquid is
processed through the CP, a sensor detects the liquid. This sensor is used along with a time stamp “Flow Start”
to establish that there is flow. The lower the number the less liquid required to establish flow. If there is no
established flow the unit will run until the
Flow Min Start
time is reached. See below for
Flow Min Start
. Flow
Start may need to be adjusted when working with very small sample volumes (i.e. <10 mL). Min = 0.0 seconds,
Max = 5.0 seconds
Flow End
determines the flow sensor sensitivity needed to establish “no flow.” Once “no flow” is established
the unit will shut down. The lower the number the quicker the unit will shut down after the fluid is processed.
CPT types (eg. Ultrafilter CPTs) and sample matrices that run at low flow rates may require a lower setting to
ensure that the instrument shuts down at the end of the sample concentration run. A setting of 0.0 may be used
to allow the user to manually end the sample run using the menu. Min = 0.0 seconds, Max = 20.0 seconds
Flow Min Start
determines the length of time that the unit will run without liquid flow before the unit times
out. The lower the value the quicker the unit will timeout if it does not see flow at the start of a run. Viscous
fluids and lower flow rate CPTs, such as the ultrafilter CPTs. may require a higher set point. Min = 1 second, Max
= 60 seconds
Ext Delay Sec
This sets the delay time between the vacuum relief and the foam valve opening. The delay allows
the pressure on the permeate side of the membrane in the CPT to achieve equilibrium. Changes to the Valve
Open time and Pulse count should be considered first. Min= 0.1 seconds, Max = 10.0 seconds
Pump Power
This sets the pump duty cycle. A setting of 50 is 50% power. A lower power setting may increase
efficiency and reduce fouling with some matrices, however the initial process flow rate will be reduced.
Min= 25%, Max = 100%
Ext Pump Delay
This sets the delay after the foam valve open time before the permeate pump is turned on to
remove residual fluid. Changes to the Valve Open time and Pulse count should be considered first. seconds,
Min= 0.1 seconds, Max = 10.0 seconds
Reset all defaults
resets
all
settings on the unit to the factory defaults, and custom protocols will be lost.
Return
will return to the Select Protocol menu.
8.3
D
EFAULT
C
ONCENTRATION
R
UN
P
ROTOCOLS
There are three default Concentration Run Protocols that have been programmed in the instrument by the factory: FLAT,
HOLLOW, and ULTRA. These settings are specific to the type of CPT being used. The FLAT protocol is for use with the flat
membrane CPTs (items CC08000 and CC08001), HOLLOW is for use with hollow fiber CPTs (items CC08018, CC08022,
CC08020), and ULTRA is for use with the hollow fiber ultrafilters (item CC08003). Table 8.1 shows the standard set points
(shown in blue) and advanced menu set points (shown in orange) for each protocol:
