39
9 Adjustment options
Example 2:
Nominal range: 0—600mbar
Range required: -300 to +300mbar
Measurement start: -50%
Span: 100%
Zero
adjustment
When a zero adjustment is made, the transmitter display is set to 0.000. The
preset measurement start remains unaffected.
Setting the measurement start:
➩
"Output current, measurement start and end", page 38.
Current
generator
If the “current generator” function is selected, an adjustable constant current
is present at the transmitter output.
Output current
in fault situation
In order to indicate measurement errors in the event of over/underrange, or
other errors, (e.g. for a connected PLC), the pressure transmitter gives out
either 3.85mA or 21.5mA.
➩
"Output signal and display", page 23.
Keys inhibited To prevent an unauthorized modification of parameters, some or all of the
parameters can be inhibited.
Characteristic The characteristic of the output current can be selected as:
❏
Lin: linear (proportional to pressure).
❏
SLin: linear up to the starting point, then square root
(proportional to flow-through),
❏
SoFF: square-root (proportional to flow), but switched off up to
the starting point.
This function is inhibited for absolute-pressure transmitters.
➩
"Nameplate", page 8.
There is no time-out for this function; the current can remain indef-
initely.
This function can only be ended by pressing the key. It is not
possible in multidrop mode.
➩
"Connection of a HART® communicator", page 20. In this case,
a constant current of 4mA is present at the output.
P
To remove an inhibit (LA, L0, LS), the key must be pressed for
longer than 5 seconds in the display “Output current in fault sit-
uation” (P9).
The inhibit “LALL” can only be set or deleted in the setup program.
P
The starting point of the square-root characteristic can be adjusted
between 5.0 and 15.0% of the output current.
To Next Page
