14
WIKA Operating Instructions Level Transmitter
– BLM-SF-FM
4.2.2.1 Adjustment of the offset
The offset (4 mA-point) of the analogue output is adjustable. When setting
the offset, the distance to the span remains constant.
Available functions and their use are:
Function
Description
Set the offset to
the current meas-
urement value of
the primary varia-
ble (PV).
Access:
Setup -> 4-20 mA -> Offset
-> PV actual
Set the offset to
an arbitrary PV
value.
Access:
Setup -> 4-20 mA -> Offset
-> PV value
The standard value of the offset after reset to defaults is 40 mm above the
lower sensor end.
4.2.2.2 Adjustment of the span
The span (20 mA-point) of the analogue output is adjustable.
Available functions and their use are:
Function
Description
Set the span to
the current meas-
urement value of
the primary varia-
ble (PV).
Access:
Setup -> 4-20 mA -> Span ->
PV actual
Set the span to an
arbitrary PV val-
ue.
Access:
Setup -> 4-20 mA -> Span ->
PV value
The standard value of the span after reset to defaults is 40 mm below the
sealing surface of the thread connection.
0
4
8
12
16
20
0
20
40
60
80
100
C
u
rr
e
n
t
/
m
A
Measured value / mm
Uncorrected
Span adjusted
