Hydro Logger H40
User manual
22
electronics for ecology
FIEDLER
4.3.
Analog channel settings
Analog channels form the basic structure of the recording part of the H40 station. The
analogue or pulse signals are measured, converted to the measured physical quantity
and stored in memory in the selected units of measurement. Free channels can also be
occupied by a value calculated from the values on the occupied channels (sum, differ-
ence and special functions). Each channel can have its own archiving interval and alarm
limits.
4.3.1.
Setup procedure and basic parameters
Each measurand occupies one channel in the station, whose parameters and memory
space are fully available to this one measurand only. The user has the possibility to set
a total of 8 analogue channels.
Do not confuse the channel with the input. A signal fed to one input can be processed and
archived on multiple channels. Selecting the channel serial number is the first step in the
setup.
The selection of the measurand from the of-
fered list must be the second step, because
the list of offered measurement units and
measurement methods depends on the se-
lected measurand.
In the list of measurement methods, you
need to select the appropriate signal type of
the connected probe. For example, when
measuring the level in a VDJ with a sub-
mersible pressure transducer with standard
current output, select the method "
Current.
Loop 4 - 20 mA
The measurement method called "
Calculation Functions
" has its place at the H40 sta-
tion. With its help, it is easy to monitor the continuously calculated moving average for a
configurable time interval on a separate channel and to activate the sending of a warning
SMS according to this calculated value. It is usual that the archiving of this auxiliary
channel is suppressed (see below). Other methods in the "Calculation functions" menu
include, for example, the sum or difference of two channels.
C h a n n e l
M e a s u r e d q u a n t i t y
M e a s u r i n g m e t h o d
The channel name will
be displayed on the
unit display and in the
SMS (diacritics are au-
tomatically suppressed
before sending the
SMS).
By pressing the right
mouse button over the
selected channel, you
can copy, paste or de-
lete its parameters.
Step 1 Setup
:
select any free chan-
nel
Step 2:
Select
the measured quantity
Step 3:
Select the me-
asurement method
The input does not
have to match the
channel number.
Other important para-
meters dependent on
the measurand and
the measurement met-
hod
The overlimit interval
will help to record inte-
resting waveforms in
detail.
Hysteresis prevents
frequent switching on
and off of the alarm.
The steepest alarm is
activated on both rise
and fall above the set
speed.
Activation of alarms
can trigger the sending
of SMS or change the
basic archiving interval
to an overlimit interval.
A limit alarm occurs
when the measured
value exceeds the up-
per limit or falls below
the lower limit.
