KROHNE Summit 8800 Vol 2 - Manual (Page 160)

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SUMMIT 8800 SAMPLER 12
12. Sampler
Liquid Gas Steam
For many applications it is necessary to monitor the quality or composition of the fluid going
through the pipe. One of the ways to do so is to regularly collect a sample of fluid in a can or
container and to take this to a laboratory analysis. The associated standards are the
ISO 3171, 1998, chapter 15 for the sample volume
API 8.2 appendix F for the sample frequency, grab factor, performance factor etc.
In many cases only one sampler will be used for the station, but where multiple products are
used multiple samplers might be needed. The SUMMIT can handle one sampler per stream.
In case of mass based sampling, the SUMMIT can handle two cans per sampler. The switching of
cans has to be done manually, monitoring of the weight is done automatically, including tarring
for bottle weight.
Many different methods are supported by the flow computer and have been devised to get the
most relevant sample for an application. This varies on the sampler method (which period to
take the sample) and the sampler frequency (how often to take a sample):
Figure 175 Sampler timed based configuration
12 .1 Sampler method
Off No sample is taken
Fixed time period Sampling is activated from the start date/time to an end date/time
Duration Sampling is actived for a fixed duration in days to seconds
Batch Sampling is is based on the batch parcel size
Continuous Sampling is always running
Sample frequency
Time based
A sample will be taken periodically. The interval in seconds must be given
Flow based A sample will be taken every time when a quantity of product has passed.
In this case the ID must be selected from any of the available counter
increments of volume, mass or energy (see below) and the quantity is defined as
the flow passed.
Manual A sample will be taken when manually triggered, or a request received via a
modbus