Hach-Lange SC 1000 - Manual (Page 85)

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Advanced Operations
ANALOG CURRENT INPUT
The current input card connects devices with a current input interface to the sc1000
controller. Every current input channel can be configured separately, unit and parameter
are displayed in the measured value display. It is mandatory to have an corresponding
open jumper on the current input card to connect a device.
DIGITAL CURRENT INPUT
To differ two digital states the corresponding jumper on the internal current input card has
to be closed respectively the corresponding bridge has to be set at the external current
input card. The different states are recognized by closing or opening a contact between
the corresponding screwing terminals.
There is the possibility to adjust the input current measuring with an offset and a
correction factor to enhance the accuracy. By default these two parameters are set to “0”
(offset) and “1” (correction factor). When a channel is used as a digital input the display
will show the values “HIGH” or “LOW”.
sc1000 SETUP
CURRENT INPUTS
mA INPUT INT/EXT
Select INPUT card 1,2,3 or 4
EDIT NAME
Default value: Serial number of device as text
Enter text for example for the location of the current source.
DEVICE NAME
Default value: No text
Sets the device name.
PARAMETER NAME
Default value: No text
Sets the parameter name.
SET PARAMETER
Default value: “ChanX” (X=Channel number of the input current module)
Sets parameter for the calculated output value.
DATA VIEW
Default value: OUTPUT VALUE
Sets the value which is displayed as the measured value in the display module and logged into
the data logger.
INPUT CURRENT Displays the real measured input current.
OUTPUT VALUE
Displays the calculated output value after scaling the output value with the SET LOW VALUE
and SET HIGH VALUE menu settings.
UNIT
Default value: No text
Sets the unit for the calculated output value.
SET FUNCTION Default value: ANALOG
ANALOG Input channel is used as analog input.
DIGITAL Input channel is used as digital input.
SET FILTER
Default value: 10 seconds
Sets a period of time for recording measured input currents.
The input current is the result of an average value, calculated from the last measured input
currents recorded over a defined period (which is set in this menu).
LOGIC
Default value: DIRECT
Sets the relation between input state and output level.
The menu item is displayed if SET FUNCTION is set to DIGITAL.
DIRECT
If the input contact is closed the output level is LOW respectively if the input contact is open the
output level is HIGH.
REVERSE
If the input contact is closed the output level is HIGH respectively if the input contact is open the
output level is LOW.
SCALE 0 mA/4 mA
Default value: 0–20 mA
Sets the input current range either to 0–20 mA or 4–20 mA.