Endress+Hauser Liquistation CSF33 - Page 59

Liquistation CSF33 Operation
Endress+Hauser 59
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.