Entering further basic program data
24
Entering further basic program data
For selecting and entering data for these functions, please proceed
as described under "Entering basic program data".
Internal flushing
To ensure that the analysed sample represents the current value, the
sampling line must be sufficiently flushed. If the plant has been out of
operation for a longer period or in case of long analysis intervals, we
recommend you to select a flushing time greater than 60 seconds.
Flushing starts by simultaneously opening the inlet and the outlet
valve of Testomat 2000
®
PO4.
Duration of the analysis interval
The analysis interval depends directly on the programmed flushing
time. If, e.g., a flushing time of 90 seconds has been set, the
actual analysis interval cannot be less than 90 seconds.
In
, select
=>
=>
Enter the "
in seconds (s)
Press "ENTER" to confirm the entry
Setting the internal flushing time
For connections longer than 3 m and with an internal hose
diameter of 6 mm a minimum internal flushing time of 10 seconds
is required to ensure that a valid sample is taken from the
sampling line. The required quantity of flush water for one-minute
internal flushing is 0.5 litres.
External flushing
If very short analysis intervals are required, or if a very long (several
metres) sampling line or a line with a large diameter is used, an
external flush valve should be installed upstream of Testomat 2000
®
PO4
. The external flush valve has to be connected to the "Flush”
outlet. If the unit is used for monitoring two measuring points, external
flushing prevents incorrect measurements caused by sample mixing.
The external flushing time for the valve depends, just as the flushing
time for unit flushing does, on the length and diameter of the supply
line to Testomat 2000
®
PO4.
In
, select
=>
=>
Enter the "
in seconds (s)
Press "ENTER" to confirm the entry
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NOTE
NOTE
