Siemens SITRANS L Series Компактная инструкция по эксплуатации - Страница 24

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Siemens SITRANS L Series Компактная инструкция по эксплуатации
Commissioning
6.2 Local commissioning
6.2.3

Low temperature effects on RUN/PROGRAM modes

If the internal temperature falls to –30 °C (–22 °F) or below, it will affect both RUN and
PROGRAM modes.
RUN mode will operate normally, with the following exceptions:
● Handheld programmer operation is disabled
● The LCD displays only limited information: the bar graph and the reliable/ unreliable echo
indicator
PROGRAM mode:
● Handheld programmer operation is disabled
6.2.4

RUN mode

SITRANS Probe LR automatically starts in RUN mode when power is applied, and detects
the material level. The primary reading displays the material level (in meters) referenced
from Empty (process empty level). This is the default start-up display mode.
System status is displayed on the LCD, or on a remote communications terminal.
Display
Normal operation
1. Auxiliary Reading (depending on the parameter selected, it displays milliAmp value,
distance or confidence, with units where applicable)
2. Primary reading (displays level, distance, or volume, in either units or percent)
3. Secondary Reading (displays Parameter number for Auxiliary Reading
4. Echo status indicator: Reliable Echo
5. Units or percent
6. Active bar graph represents material level
If the echo confidence drops below the echo confidence threshold, the failsafe timer starts
running. When the timer expires, the letters LOE (Loss of Echo) alternate with the reading
every two seconds, and the Reliable Echo indicator is replaced by the Unreliable Echo
indicator. When a valid reading is received, the level reading display returns to normal
operation.
Press
1)
24
to display the auxiliary reading field when in RUN mode.
Failsafe operation
or Unreliable Echo
SITRANS Probe LR with mA/HART
Compact Operating Instructions, 05/2019, A5E46248119-AC
)
1