Page 78 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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General Operation
Temperature
Activates an alarm when the process temperature reaches a certain value (Low
Temperature Value ON for Low Temperature Alarm or High Temperature Value ON for a
High Temperature Alarm).
The temperature source can be the temperature sensor built into the transducer or an
external TS-3, as set by
Temperature Source
. (Temperature Source is set in the Quick
Start Wizard, see page 39.)
Example: Setting a High Temperature Alarm
To assign Relay 3 to a high temperature alarm that activates when the temperature goes
above 30 °C do the following:
1. Enable the High Temperature Alarm (set
2.8.7.1. Enable
= Enabled)
2. Set
2.8.7.2. High Temperature Value ON
= 30
3. Set
2.8.7.3. High Temperature Value OFF
= 28
4. Set
2.8.7.4. Assigned Relay
to Relay 3.
The high temperature alarm will not de-activate until the temperature falls to 28 °C.
Use
2.8.7.5. Alarm State
to view the current state of the High Temperature Alarm.
Example: Setting a Low Temperature Alarm
To assign Relay 3 to a low level alarm that activates when the temperature falls below
-10 °C do the following:
1. Enable the Low Level Alarm (set
2.8.6.1. Enable
= Enabled)
2. Set
2.8.6.2. Low Temperature Value ON
= -10
3. Set
2.8.6.3. Low Temperature Value OFF
= - 8
4. Set
2.8.6.4. Assigned Relay
to Relay 3.
Use
2.8.6.5. Alarm State
to view the current state of the Low Temperature Alarm.
Switch (Discrete Input) Alarm
Activates an alarm when a discrete input is in a pre-defined state.
Example: Setting a Switch Alarm
To assign Relay 3 to a switch alarm that is activated when DI 1 turns ON do the following:
1. Enable the Switch (Discrete Input) Alarm (set
2.8.3.1. Enable
= Enabled)
2. Set the
2.8.3.2. Discrete Input Number
= 1
3. Set
2.8.3.3. Discrete Input State
to ON.
4. Set
2.8.3.4. Assigned Relay
to Relay 3.
Use
2.8.3.5. Alarm State
to view the current state of the Switch Alarm.
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