Hydro Logger H40
User manual
FIEDLER
electronics for ecology
25
ALARMS
The H40 station allows you to set limit and steady-state alarm parameters for each chan-
nel. After activating the alarm, it is possible, for example, to record the measured values
more frequently (even on other channels) and send warning SMS or change the interval
for sending data to the server.
Limit alarms and their parameters
The setting limits define the area in which the measured value can move. A
drop in the
instantaneous value below the
Lower Limit
reduced by the
Hysteresis
or, conversely, a
rise in the instantaneous value above the
Upper Limit
increased by the Hysteresis will
cause an immediate activation of the limit alarm. The alarm can only be switched off
again after the instantaneous value has returned to the allowed range narrowed on both
sides by the value of the
Hysteresis
parameter. These relationships are illustrated in the
previous figure.
To remember: A value within the limits is OK, an alarm occurs when the limits are exceeded
by a hysteresis.
The steep alarm requires the input of a single parameter. This parameter is called the
Steepness Limit
and its value indicates the maximum allowable change in the monitored
variable over the archiving interval. If this parameter is exceeded, either by an increase
or decrease in the monitored variable, in a time less than or equal to the set archiving
interval, a
Steep Alarm
will be activated on the channel.
4.3.2.
Archiving
Each recording channel of the instrument has its own
Archiving Interval
, adjustable in
multiples of the
Basic Archiving Interval
(it is located in the 1st tab of the parameters
"Basic parameters" and is usually set to 10 min). Less important quantities can therefore
be recorded at a longer interval (e.g. 1 h), thus saving both the data memory of the H40
and the time required to transfer the measured data to the server.
Note: Because the Archiving Intervals are stored in the instrument parameters as multi-
ples of the Base Archiving Interval, a change to this Base Interval will be reflected in all
Archiving Intervals for each recording channel.
A zero value of the "Archiving interval" parameter will exclude the set channel from ar-
chiving. This can be preferably used for those channels that are to be used only for
activating SMS alerts.
L i m i t a l a r m
S t e e p a l a r m
A r c h i v i n g
s u p p r e s s i o n
