User's Manual Part 1

Important and common terms
14
The Commander can only ever interact with a single registered logger group. This group
is called the “workgroup”. It is not possible to program or read loggers from another
group.
The “measuring window” is the time during which a logger is programmed to carry out
measurements, e.g. from 2 a.m. until 4 a.m. in the morning.
A measuring window could also be referred to as a “measuring day”.
A measuring period refers to the time span that passes between programming and
reading a logger. A measuring period can therefore last 1 to 100 measuring days.
There is a certain basic noise level in each pipe system. This basic noise level is
referred to as the “leak threshold”. This level may be known or estimated based on
experience. If the lowest measured noise level in a section of pipe is above the leak
threshold, there is presumed to be a leak.
If the level of the quietest noise in a measuring window is above the previously found
leak threshold (see above), the logger goes into “leak status”. This means, for example,
that when this logger is read, a warning appears on the reader indicating that there is an
increased probability of a leak close to the logger.
The term “leak value” combines the three measurement results – level, frequency and
ESA value – determined for the quietest noise in a measuring period.
If a noise logger has been switched off (i.e. it has stood “on its head” for at least
3 minutes), it is in “configuration mode” after it is switched back on. This means:
• The previous programming has been deleted. The logger is now unprogrammed.
• Switching off has not deleted the previously saved measurement results. They are
still in the logger’s memory and can be accessed by a reading device, but only by
single interrogation (see page 54).
• The logger is ready for wireless operation and waiting to be contacted by the
Commander or PC.
The logger remains in configuration mode until it is reprogrammed.
Each device in the Sebalog N-3 series has a unique serial number (SN). You will find it
on the type plate of the device.
All loggers, repeaters and GSM boxes also have an identification number (ID) which can
be used by the Commander or the SebaDataView software to manage them. You will
also find the ID on the type plate, or on a separate plate on the device. The identification
number is identical to the last six digits of the serial number.
When inputting an ID, the preceding zero digits can be omitted.
Thus, if the ID is “000815”, you need only enter “815”.
Workgroup
Measuring window
Measuring period
Leak threshold
Leak status
Leak value
Configuration mode
Identification number