15
2.4
S
ENTINEL
2
S
YSTEM
K
ITS
Sentinel 2
systems
can be ordered using a system
kit part-number
.
A kit part-number is used merely for the purpose of ordering several system
components under a single part-number. No components will be labelled with the kit
part number; Each item will be labelled using its regular part-number (as described
within sections that follow).
Please discuss any requirements for ordering Sentinel 2 as a system kit with your sales
representative.
2.5
S
ENTINEL
2
C
ONTROL
B
OX
–
D
ESCRIPTION
Sentinel 2 control box is a combination of a PRV controller and a built-in data-logger.
2.5.1
Logger functions
At the appointed time, the built-in logger
will go into the state of “Recording” and beg
in
repetitive logging.
The logger will periodically sample any sensors employed by the PRV controller, but
additional sensors can be optionally included in the built unit. These must be requested
at the time of ordering; refer to the model-number scheme (see section 2.5.3).
After taking several measurement samples, some statistical functions can be optionally
applied to produce a datapoint that is logged (saved
); a “point measurement” (a single
data sample) can alternatively be saved. The rate at which these are recorded is known
as the “log period”, which is always a multiple of the “sample period”.
The datapoints are stored in the memory of the unit. The unit occasionally calls into the
cellular data network in order to contact the server; the data is then uploaded.
An installer can also download a copy of the data into the IDT tool for analysis on-site.
The logger can be programmed to monitor data for certain patterns or conditions and
to send a message to the server if it should detect a match. Commonly, this is used for
setting a condition to be detected by the unit that can be an indication of
an “alarm”.
The logger makes measurements (as described above) into an area of memory which is
referred to as the “primary recording”. If the logger has the feature enabled, it can also
be set to occasionally save additional
data into a “secondary recording” memory area,
(e.g., data sampled at a higher frequency). This is not available on all supplied units and
must be arranged through your sales representative before placing an order; it has
implications concerning expected battery life of the unit.