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3.1 CONSTANT PRESSURE: Alarm Limits
SUMMARY:
This section allows you to assign limiting values for several different alarm
conditions:
Cumulative Volume (CV)
in milliliters;
Hi Temperature
in
⁰
C;
Run Time (RT)
in
Hours: Minutes;
Lo-Pressure (LP)
(monitor system leakage) in psi;
Lo-Flow (LC)
(pump will
stop when collection rate falls below this limit) in ml/min.;
Filtrate Quantity (FQ)
in grams.
Note:
The alarm condition is triggered when the alarm limit is achieved.
Alarms are not mutually
exclusive. You may select any combination of alarms.
For critical alarms you may want the FilterTec Plus pump to stop (
Pump Stop
). For less critical
alarm conditions you may want to choose an auditory alarm (
Alarm Only
).
NOTE:
The Lo-Pressure alarm is directly related to the Source chosen in SETUP: Press.
Sensor, Source, i.e. P1, P2, etc.
Use
“Up”
and
“Down”
keys, then press
“Select”
to implement selection.
Cumulative Volume (CV):
This alarm setting represents the total volume of process solution
that is delivered through your filtration device when no balance is in use.
Use the Filtrate
Weight Alarm for this when a balance is in use!
For example: if you set the
Cumulative
Volume Alarm
to 10,000ml or 10 liters, the FilterTec Plus will either alarm and / or stop the
pump when 10 liters of solution has been delivered through the filtration device.
Hi-Temp
(HT):
Used to monitor the temperature of the process solution, this will stop the pump
at the set limit. Default = 35.0
⁰
C
Run Time (RT):
This alarm setting allows you to set a timer for the filtration of your process
solution. For example, if you set the
Run Time Alarm
to 01:30, then the FilterTec Plus will
provide you with an auditory alarm and / or stop the pump after one (1) hour and thirty (30)
minutes have passed. This allows you to define the processing time, i.e. the time required to
obtain a desired filtrate yield.
Lo-Pressure (LP):
Typically set 3-5 psi units below the
Pump Pressure
setting. The Lo-
Pressure Alarm is triggered when a sudden filter backpressure drop occurs after rising above
this setting. Such a change in the filter backpressure usually indicates a system leak, i.e. pump
tubing has slipped off the filter connection.
Lo-Flow (LC):
For constant pressure filtration, this represents a critical alarm condition, and
should be set to
Pump Stop
in Low-Flow Alarm Enable. In this operational mode, the FilterTec
Plus will detect any filter backpressure increases in the source pressure sensor (due to slow
filter plug-up) and automatically decrease the feed rate to maintain the selected
Pump
Pressure
setting (see 3.17). The Lo-Flow parameter (ml/min) represents lowest pump rate
before the pump shuts down. The Lo-Flow parameter should be set just below your desired
minimum collection rate.
Filtrate Qty. (FQ):
The FilterTec Plus comes with a top-loading balance. Enter the filtrate weight
(grams) that you want to collect, and the FilterTec Plus will either alarm or stop the pump when
the desired weight has been collected. Set this value to zero if you do not wish it to trigger
during normal use. The maximum value is 99,999 gm. (100Kg).
NOTE: This alarm must be enabled in at least “alarm only” mode in order for the Q1
(Filtrate Weight) to be obtained or displayed.
Содержание SciLog FilterTec Plus
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Страница 39: ...39 ...
Страница 62: ...62 Appendix A Application Examples ...
Страница 66: ...66 Appendix B Troubleshooting ...