KROHNE OPTIFLEX 8200 C Handbook page 101

OPTIFLEX 8200 C/F/S
Alarm modes
There are two alarm modes: 'high level alarm" and "low level alarm". "Low level alarm" tells the
device to set the relay to "on" and send a signal when the quantity of product in the tank is less
than the threshold. "High level alarm" tells the device to set the relay to "on" and send a signal
when the quantity of product in the tank is more than the threshold.
You can change the alarm mode in:
• the Auto Setup procedure (Alarm mode),
• the Advanced Setup menu (sub-menu 1.3.2 Output I2 Setup / Alarm mode) or
• the Supervisor menu (menu item 2.4.13 Alarm mode).
Hysteresis
Hysteresis specifies the conditions when the relay status goes back to "off". If Alarm Mode
to "HIGH LEVEL ALARM", then hysteresis is the quantity below the threshold where the relay
status goes back to "off". If Alarm Mode
quantity above the threshold where the relay status goes back to "off".
For example, if Switch Function
Hysteresis Hysteresis is "1 mA" and Alarm Mode
Hysteresis Hysteresis
"off" when the measured current is 13 mA.
Figure 6-4: Relay output: alarm mode, threshold and hysteresis
1 Device with relay output in "high alarm" mode
2 Device with relay output in "low alarm" mode
3 Zone where the relay output is set to "off"
4 Zone where the relay output is set to "on"
5 Continuous line: Level (threshold) at which the relay output changes to "on" (if Switch Function
position of this threshold is specified in Set Point/Threshold
6 Dotted line: Level at which the relay output goes back to "off" (if Switch Function
limit is specified in Hysteresis
7 Dimension given in Hysteresis
06/2018 - 4006448901 - MA OPTIFLEX 8200 R01 en
Alarm Mode is set to "LOW LEVEL ALARM", then hysteresis is the
Alarm Mode Alarm Mode
Switch Function is "CURRENT mA", Set Point/Threshold
Switch Function Switch Function
Alarm Mode is "LOW LEVEL ALARM", then the relay status goes back to
Alarm Mode Alarm Mode
Set Point/Threshold. Set Point/Threshold Set Point/Threshold
Hysteresis Hysteresis. Hysteresis
Hysteresis
Hysteresis Hysteresis
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OPERATION
Set Point/Threshold is "12.00 mA",
Set Point/Threshold Set Point/Threshold
Switch Function is set to "LEVEL"). The Switch Function Switch Function
Switch Function is set to "LEVEL"). The position of this Switch Function Switch Function
6
Alarm Mode is set Alarm Mode Alarm Mode
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