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16 Applications
16.1 Hydraulic tank
Minimum level monitoring with early warning and alarm
Switching output 1: early warning
SP1
slightly above rP1 (to suppress wave movements)
rP1
below preset level → early warning, start refilling
ou1
hysteresis function, normally closed (Hnc)
Switching output 2: alarm
SP2
min. value reached again → alarm reset
rP2
below min. value → alarm
ou2
hysteresis function, normally open (Hno)
XX.X = display value
A = early warning, B = alarm
• If the level is below rP1, output 1 switches until liquid is refilled. If SP1 is
reached again, output 1 switches off.
• If the level is above SP2, output 2 switches. If the level falls below rP2 or if
there is a wire break, output 2 switches off.
• By setting SP1 the maximum level can be controlled / monitored: The value of
SP1 determines up to which level (max) is to be refilled. When the maximum
level is reached, this is signalled by the LED OUT1 going out and output 1
switching off.