General Operation
7.6 Alarms
SITRANS LUT400
100 Operating Instructions, 07/2019, A5E33329501-AC
7.6.2 Level
The level alarm is the most common. Use this alarm to warn you when your process is in
danger of being upset due to high or low levels.
High level and low level alarms can be set to activate when the material level rises above or
falls below a set level. (See High Level Alarm (2.8.1.) (Page 196), Low Level Alarms (2.8.2.)
(Page 197).)
Example: Setting a High Level Alarm
To assign Relay 3 to a high level alarm that activates when the level rises above 10 m:
1. Enable the High Level Alarm (set Enable (2.8.1.1) (Page 196) = Enabled)
2. Set High Level Value ON (2.8.1.2) (Page 196) = 10 m
3. Set High Level Value OFF (2.8.1.3) (Page 197) = 9 m
4. Set Assigned Relay (2.8.1.4) (Page 197
) to Relay 3.
Use the High Level alarm in conjunction with Time To Spill (2.8.12.) (Page 207) feature.
Example: Setting a Low Level Alarm
To assign Relay 3 to a low level alarm that activates when the level fails below 2 m:
1. Enable the Low Level Alarm (set Enable (2.8.2.1.) (Page 197) = Enabled)
2. Set Low Level Value ON (2.8.2.2.) (Page 197) = 10 m
3. Set Low Level Value OFF (2.8.2.3.) (Page 198) = 9 m
4. Set Assigned Relay (2.8.2.4.) (Page 198
) to Relay 3.
7.6.3 In-bounds/ Out-of-bounds Range
Use the bounded range alarms to detect when the level is inside or outside of the range.
7.6.3.1 Example: Setting an In-bounds Level Alarm
To assign Relay 3 to an in-bounds level alarm do the following:
1. Enable the In-bounds Level Alarm (set Enable (2.8.4.1.) (Page 199
) = Enabled)
2. Set High Level Value (2.8.4.2.) (Page 200) = 1.30 m
3. Set Low Level Value (2.8.4.3.) (Page 200) = 0.30 m
4. Set Assigned Relay (2.8.4.4.) (Page 200
) to Relay 3.
Results:
● Activates alarm assigned to relay 3 when level is within range 0.3 to 1.3 m
● Resets alarm above 1.3 m or below 0.3 m
Use Alarm State (2.8.4.5.) (Page 200) to view the current state of the In-bounds Level Alarm.
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