Hydro Logger H40
User manual
FIEDLER
electronics for ecology
27
The overlimit interval
is specified in minutes and cannot be greater than the value of the
base Archiving Interval.
Fig. 1Detailed record of the measurand using the Over-Limit Archiving Interval.
Note: The trigger condition for going to the "Over Limit Interval" archiving of a given
channel can be a Limit or Gradient alarm on the channel itself, or a Limit or Gradient
alarm on any other channel. A special trigger condition for the "Over Limit Interval"
may also be the start of rain (first flip of the boat rain gauge) .
4.3.3.
Advanced parameters
An important step in setting up a recording channel is to call up a window with advanced
parameters. The shape of this window and the type of parameters it contains depends on
the selected measurand. For example, a different window is used to set up a level measure-
ment and another simpler window opens for a temperature measurement.
EXAMPLE: LEVEL MEASUREMENT
Most commonly, the level is measured with a pressure dipping probe or an ultrasonic
probe placed above the maximum level.
The output signal of the probes is either a 4 - 20 mA current output (0 - 20 mA, 1 - 5 mA)
or an RS485 serial interface. Depending on the type of output signal, select the "Meas-
urement method" parameter and set the Input number or address for RS485 communi-
cation.
After pressing the "Ad-
vanced" button, a window
opens with parameters
that define the measuring
range, zero offset and pos-
sible correction coeffi-
cients for calculating the
level.
Use the first option "Signal
proportional to level" for
most probes. You only
need to set the level vs.
distance calculation for
older US1000 ultrasonic
probes, which sent the dis-
tance of the level from the probe instead of the level.
O u t p u t s i g n a l s
S i g n a l p r o p o r t i o n a l
t o l e v e l
M a x . v a l u e
