Pre-Alarm Threshold Via Parameters P.5, P.7, P.9 And; Response Time Via Parameter; Alarm Storage Via Parameter; Check Installation And Configuration - Siemens SITRANS DA400 Operating Instructions Manual

Process monitoring

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8.2.4

Pre-alarm threshold via parameters P.5, P.7, P.9 and P.11

Damage development can be detected with the pre-alarm. Frequency and time intervals are

used here as statistical aids.

Select the limit value such that it performs the task you want it to. We recommend that you

set the pre-alarm to half the value of the main alarm limit.

8.2.5

Response time via parameter P.13

Time that has to pass before the value exceeding or falling below the limits causes an alarm

to be output or an alarm to be reset.

The signal behavior of the diagnostics unit can be optimized by using the response time.

This allows you to prevent momentary alarms from being triggered.

Note

The response time setting applies to all measurement channels for incoming and outgoing

signals.

8.2.6

Alarm storage via parameter P.14

If you activate the alarm memory function, you prevent an alarm that has been triggered

once from being deleted again, e.g., when the system was shut off after an alarm signal.

8.2.7

To check the sensors, switch the measurement channel to test mode. This makes it possible

to check whether the correct sensor is on the correct measurement channel.

To check the correct configuration of the alarm thresholds and assignments to the digital

outputs, the measurement channel can be switched to simulation mode.

8.2.8

After a repair, you have to reset the timer in the trace menu, if necessary. Use the the menu

item "Reset All".

SITRANS DA400 for material flow monitoring with protection against explosion

Operating Instructions, 09/2007, A5E00841152-01

8.2 Recommendation for selecting parameters

Commissioning

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