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server that the data was received without error; If confirmation is not received, it will re-
send the data at the next call-in time.
The logger can be programmed to monitor data for certain patterns or conditions and
can send a message if it should detect a match. Commonly, this is used for setting a
condition that can be an indication of an “alarm”. The message can be sent to either the
server (the usual destination) or another device.
2.4.
E
NHANCED
L
OGGING
(
OPTIONS
)
Section 2.3 gave a description of logger operation that is available as standard on most
Multilog2 logger models; The logger normally samples data at the set sample period,
and records datapoints at the set log period. However, certain models offer options for
making
additional
recordings (of logged data) at higher-than-normal sampling rates. The
additional data is recorded within the
“secondary recording” memory area.
These features
are sometimes referred to as “Enhanced Network” logging and
“Pressure
Transient” logging
; Collectively they are
referred to as “Fast Logging”
.
The ‘Enhanced
Network’ and ‘Pressure Transient’ loggers (both being based on the Multilog2 design),
have the named option available as standard.
Note: The feature can only be installed by the factory at the time of build. The options
must therefore be specified at the time of ordering, along with the required
maximum sampling rate.
Additional sampling has implications for power consumption and may require
the use of external batteries to meet the required service life.
The fast-logging features of the logger can be disabled during logger setup. Where
enabled, the logger has two strategies for dealing with memory becoming full. Either
the fast logging will stop, or older data can be over-written. Make the selection you
require during setup.
Not all sensor types are able to work at high sampling frequencies. The feature is
therefore usually set to work with analogue sensors, such as a pressure transducer.
Fast logging is frequently used to monitor pressure fluctuations on the water supply
network.
For Multilog2,
‘Enhanced Network’ logging and ‘Pressure Transient’ logging are mutually
exclusive settings (only one can be used). Each has a different operation.
Enhanced Network Logging:
•
This option allows certain events to create a secondary recording.
•
The recording will be made at the background sampling rate.
•
The recording can be a single channel or can include additional channels (if the
sensor can cope with the speed).
•
The maximum sampling rate is limited to a frequency of 1Hz.
Pressure Transient Logging:
•
This option allows certain events to create a secondary recording.
The logger has additional memory due to the amount of data required to be
stored.
