Process Unit 73 LF - Knick

Process Unit 73 LF
How to set the NAMUR contacts
Open the Parameter Setting menu (opl or adm
level, resp.), select ”NAMUR Contacts” using ,
and confirm with .
Press or to select
”NAMUR Contacts N/O” (normally open) or
”NAMUR Contacts N/C” (normally closed) and
confirm with .
Enter failure delay time and warning delay time
using scrolling and cursor keys (see page 2–5)
and confirm your entries with .
Limit Contacts
Two limit contacts are provided as standard.
The limit contacts can be controlled by the following
process variables:
conductivity
resistivity
concentration (only with option 359, 360, 382)
Limit Values and Hysteresis
measured temperature value (C)
input current at current input
Each of the two contacts can be set separately:
active
contact
inactive
process
variable
setpoint min
L1
hysteresis
hysteresis
setpoint max
L2
process
variable
active
contact
inactive
The process variable
controls the limit contact.
The direction
indicates if the contact will be activated when
the measured value
falls below (min) or exceeds (max)
the limit value.
Limit values 1 and 2 (L1, L2)
define the switching thresholds.
The hysteresis
defines how far the measured value must exceed
(min) or fall below (max) the limit value
until the contact returns to its rest position.
Normally open or normally closed contact
defines if the active contact is closed (N/O) or
open (N/C).
If the measured value exceeds the preset limits,
”L1” and/or ”L2” will appear in the upper right corner
of the display.
Contact 1 and/or contact 2 are active.
9–30 Capabilities