Siemens sitrans LU01 - Manual (Page 43)

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 37
m
mmmm
Pa
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P062 Offset Reading
Adds the specified value to the level reading, usually to reference the reading to sea level
or another datum level.
The operation of the device is not affected by the Offset Reading. This value is used for
display purposes only. All control measurements are still referenced to Empty.
Failsafe (P070 to P072)
As preset, in the event of a measurement or technical difficulty, the SITRANS LU01 holds
the Reading, Bar Graph, mA outputs, and relays at their last known values.
To operate process control equipment under these conditions, alter the following
parameters as required.
P070 Failsafe Timer
The time for invalid measurements to elapse before Failsafe State activates.
In the RUN mode, when a difficulty first occurs, the Reading, Bar Graph, relay status, and
mA outputs are held at last known values and the Failsafe Timer is activated.
When a valid measurement is made before the timer expires, the SITRANS LU01
advances to the new material level (if changed) as normal (per Measurement Response,
P003) and the timer resets.
Values
Range: -999 to 9999
Preset: 0.000
Related • P920 Reading Measurement
Values
Range: 0.0 to 9999
Preset 10.00 minutes
Altered by • P003 Maximum Process Speed
Related • P129 Relay Failsafe
vessel
vessel
sea level
display offset (P062)