Operation Liquistation CSF34
80 Endress+Hauser
Type of sampling Example Info
Time/flow-paced (only
possible with peristaltic
pump) Time/flow-paced
Controlled via current input
• Signal: 0 to 20 mA
• Sampling interval: 10 min
• Sampling volume: variable
The maximum sampling volume is defined at
the maximum flow rate. Example: The
maximum flow rate at 20 mA at the current
input is 160 l/s, and the maximum sampling
volume is 200 ml. When transferring samples
into a 30l mixed sample container, 144
samples are taken per day with a maximum
sampling volume of 28.8 l. With a flow rate of
80 l/s, a sampling volume of only 100 ml
would be grabbed, and a sampling volume of
50 ml would be grabbed at a flow rate of 40 l/s.
The sampling volume is always calculated
based on the flow.
Controlled via binary input
• Binary input (pulse per flow unit)
• Sampling interval: 10 min
• Sampling volume:variable
The sampling volume is defined for a flow
pulse, e.g.: 1 pulse is 20 ml. For instance, if 5
flow pulses are counted between the sampling
intervals, this results in a sampling volume of 5
x 20 = 100 ml, and a volume of 8 x 20 = 160
ml for 8 pulses. If a binary input is used for
time/flow-paced sampling, the sampling
volume is calculated per sample as a
percentage of the specified sampling volume.
Samples are taken at set
intervals with a variable
sampling volume. The sampling
volume is calculated from the
flow rate. More volume is
grabbed when the flow is high
than when it is low. Since the
flow normally fluctuates and
the maximum flow is only
rarely a constant variable, the
sampling volume transferred to
the container will depend on
the daily average.
Advantage:
Very good, representative
sampling given large
fluctuations in the flow and
constant time intervals.
Disadvantage:
Too little sampling volume is
made available for analysis
when the flow is low.
Advantage with current input:
For the sampling interval,
either the current flow rate or
the average value between the
last and current flow rate is
used to calculate the exact
sampling volume (depending
on the presetting).
Disadvantage with binary
input:
For the sampling interval, the
pulses counted since the last
sampling are multiplied by a
volume. If this is too high - e.g.
100 ml - the composition of the
sample is not representative for
analysis.
Event Event-based sampling is controlled via the
current input, binary input and/or sensor input.
The subprogram created waits to be activated
by an event that can consist of up to 3
individual events. Every possible condition can
be created using logical "and" / "or" links. For
example, the information from a flowmeter
connected to the current input can be linked to
a rain gage and a pH sensor signal connected to
the binary input. An event is defined as limit
value violation (exceeded or undershot), range
monitoring within or outside a range, or a rate
of change. Users can decide whether additional
sampling is started when the event starts
and/or ends. For the duration of the event,
users can choose from time-paced, flow-paced
or time/flow-paced sampling, or can take
single samples, use a sampling table or the
external control system.
The sampler waits for an event.
This event takes place via
internal sensor signal
processing or via devices
connected externally. As bottle
assignment is possible when
using several bottles, events
can be assigned to individual
bottles. A maximum of 24
subprograms can be started
simultaneously and assigned to
individual bottles.
Bottle synchronization
The bottle synchronization setting is possible with all types of program. In addition, bottle
synchronization can be switched via an external signal. Bottle synchronization is only
possible with a bottle change after a specific time and not with a bottle change after a
number of samples.
To Next Page
Loading...
