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3.0 CONSTANT PRESSURE: Constant Pressure
Filtration
SUMMARY:
This FilterTec Plus mode allows implementation of a
constant pressure filtration
,
i.e. a user selected filter backpressure is achieved and maintained throughout the filtration
process. When the filter device starts plugging up, the FilterTec Plus detects a corresponding
increase in filter backpressure. In order to maintain the selected filter backpressure setting,
the
FilterTec Plus will automatically decrease the feed rate
. Thus the constant pressure function
of the FilterTec Plus allows use of a safe backpressure setting that is consistent with a high
filtrate flow rate.
This mode is also used to run Vmax tests for filter sizing tests.
Use
“Up”
and
“Down”
keys, then press
“Select”
to implement that selection.
Pump Tubing:
Select sizes #13, 14, 16, 25, 17, 15, 24 or #35, use
“Up”
and
“Down”
keys for
choice of pump tubing size, then press
“Select”.
Based upon selection
,
the FilterTec Plus will
access factory installed calibration tables, which relate the pump output in ml/min. to motor
speed. FilterTec Plus output can also be re-calibrated by the utilizing the front panel star (
)
key. (See Constant Rate Mode for information on flow rate calibration.)
Clear Cumul:
Resets (Clears) the following counters in the “Exec” front panel display: CV =
Cumulative Volume; RT = Run Time; Q1 = Filtrate Weight.
Response F:
Response Factor setting, 1 to 100. Increasing the Pump Response Factor will
increase the pumps responsiveness. Default = 100.
Pressure Zero:
Allows you to zero the backpressure readings of all 3 SciPres pressure
sensors. The FilterTec Plus must not be running when resetting pressure sensor output, and the
sensor must be plugged in.
DO NOT EXCEED THE MAXIMUM PRESSURE OF 60 PSI FOR THE SCIPRES SENSORS
OR DAMAGE TO THE SENSOR MAY OCCUR.
Alarm Enable:
Allows you to select alarm options for several alarm conditions. There are three
options available: 1.
Off
(Disable the alarm)
;
2.
Alarm Only
(Enable an auditory alarm)
;
3.
Pump Stop
(Stop pump and provide an auditory alarm). All alarms trigger when user defined
alarm limits are exceeded.
Alarm Limits:
Allows you to assign alarm limits for several alarm conditions:
Cumulative Volume in ml;
Hi-Temp
in degrees Celsius.
Run Time
in Hours: Minutes;
Lo-Pressure
(monitor system leakage) in psi;
Lo-Flow
(high filter backpressure) in ml/min
based upon collection rate;
Filtrate Quantity
in grams. (This alarm must
be enabled in order to communicate with the
balance.)
The Lo-Pressure and Lo-Flow alarms are
related to the pressure source chosen.
Pump Pressure:
Allows you to select
filter backpressure
(30psi, max. recommended) for your
filtration application. The FilterTec Plus will maintain the selected setting throughout the filtration
process. Pump Pressure may be changed “on the fly” by pressing the RATE/PRESSURE key
on the front panel, making the change, and pressing the ‘Select’ button.
Do not exceed the
pressure rating for your filtration device
; consult the the filter manufacturer specifications.
Select a safe backpressure that also maximizes your filtrate flow rate.
NOTE
: The Source chosen in
SETUP: Press. Sensor, Source
i.e. P1, P2 or P3; or is the
pressure that will be controlled by this setting.
