Siemens SITRANS LR250 Instruction Manual page 88

3.15.6. Total Expected Device Life
The device tries to predict its overall lifetime. The factory default can be reset by
the user.
Values
To modify the value via PDM, open the menu Device – Maintenance, click on
Remaining Device Lifetime, enter the desired value then click Write to accept it.
3.15.7. Maintenance Status
Read only. Displays the status of the Maintenance Alerts
Values
3.15.8. Acknowledge Status
Read only. Displays the status of the Maintenance Alerts that have been
acknowledged.
Values
3.15.9. Acknowledge
Allows you to acknowledge either a Maintenance Required or a Maintenance
Demanded alert.
To acknowledge an alert via PDM:
a) Open the menu View – Device Status and click on the tab Maintenance.
b) In the Device Lifetime section, modify values as required. Click Write to accept
the changes.
3.16. Remaining Sensor Lifetime
The device monitors the predicted lifetime of the sensor (the components exposed
to the vessel environment).
3.16.1. Total Sensor Operating Time
Read only. Displays the amount of time the sensor has been operating.
3.16.2. Remaining Sensor Lifetime
Read only. The sum of Total Expected Device Life less Total Device Operating Time.
Page 84 SITRANS LR250 (HART) – INSTRUCTION MANUAL
Range: 0 to 20 years
Default: 10.07 years
0 No maintenance alerts active
1 Maintenance Required Alert active
2 Maintenance Demanded Alert Active
0 No maintenance alerts acknowledged
Maintenance Required Alert
1
acknowledged
Maintenance Demanded Alert
2
acknowledged
7ML19985JE01