Endress+Hauser Liquistation CSF34, Operating Instructions Manual, Page: 79 / 210

Liquistation CSF34 Operation
Hauser 79
The following table explains the various types of sampling using specific examples.
Type of sampling Example Info
Time-paced • Sampling interval : 5 min
• Sampling volume : 50 ml
• Bottle change mode : 2 h
With this setting, a 50 ml sample is taken
every 5 minutes. 12 samples are thus taken
every hour. Each bottle is filled over a period of
2 hours. This results in a total sampling volume
of 24 samples per bottle x 50 ml = 1200 ml.
This type of sampling remains
constant over time and does not
take changes in flow or
polluting load into account. It is
possible to take a
representative sample if the
intervals are brief (e.g. 5 min).
Flow-paced Controlled via current input
• Signal: 0 to 20 mA = 0 to 600 m3/h
•
Sampling interval : 5 min
• Sampling volume : 50 ml
• Bottle change mode : 2 h
If 20 mA = 600 m3/h, a sample is taken every
two minutes (smallest sampling interval with
maximum flow rate). The total number of
samples amounts to 60 samples per bottle.
With a flow rate of 300 m3/h, a sample is
taken every four minutes.
Controlled via binary input
• Signal pulse: 5 m
•
Sampling interval : 5 min
• Sampling volume : 50 ml
• Bottle change mode : 2 h
The pulses are scaled at the flowmeter. By
multiplying the pulses at the sampling interval,
the shortest sampling interval at the maximum
pulse frequency can be set. Example: With a
maximum flow rate of 600 m3/h, the pulse
frequency at 5 m3 is 120 pulses/h or 2 pulses/
min. With a sampling interval of 20 m3, a
sample is taken after 4 pulses = 2 minutes.
• The current inputs can be
configured for the current
range of 0 to 20 mA or 4 to
20 mA.
• The binary inputs require
power (24 V DC) for floating
contacts.
In the case of flow-paced
sampling, the sampling interval
is calculated on the basis of the
volume flow. The same
sampling volume is take at
variable intervals.
Advantage:
Good, representative results in
the event of minor fluctuations
in flow.
Disadvantage:
Longer intervals when the level
of water is low mean that
malfunctions cannot be
detected.