KROHNE BM 70 A Installation And Operating Instructions Manual page 47

8.6.7 Display
Fct. 3.2.1 (or Fct. 1.1.1) FCT.DISP.
This function is used to select the measured
variable.
•
LEVEL
Measuring range, see Figure in
}
•
DISTANCE
Sect. 8.5.
•
CONVERSION
•
REFLECTION
If the conversion value is to be displayed, a conver-
sion table must be progra mmed first otherwise a
parameter error will occur.
Fct. 3.2.2 (or Fct. 1.1.2) UNIT.LENGTH
Use this function to select the unit for displaying level and
distance.
•
m • cm • mm
•
inch • Ft
•
PERCENT • BARGRAPH
The "percent display" refers to the scaling range of current
output I. Therefore the current output must also be set to
level or distance, otherwise a parameter error will occur.
Under "Bargraph", a maximum of 25 segments are
displayed in the form of vertical lines in the first line of the
display (0% = 1 segment, 100% = 25 segments).
Fct. 3.2.3 (or Fct. 1.1.3) UNIT.CONV.
Use this function to select the unit for conversion display.
•
m3 litres
•
US Gal GB Gal (Gal = gallons)
•
ft3 bbl (petroleum barrels)
•
PERCENT BARGRAPH
•
User Unit (see Fct. 3.2.4)
The "percent display" refers to the scaling range of current
output I. Therefore the current output must also be set to
conversion, otherwise a parameter error will occur.
Under "Bargraph" in the first line of the display a
maximum of 25 segments as vertical lines are displayed
(0% = 1 segment, 100% = 25 segments).
Fct. 3.2.4 USER UNIT
Enter the text for the conversion "user unit" (see Fct. 3.2.3)
here. It consists of a maximum of 10 alphanumeric
characters.
•
Characters assignable to each of the 10 places:
alpha characters A-Z / a-z
numbers 0-9 or
special signs + -
blank characters (= underscore)
Fct. 3.2.5 ERROR MSG.
Use this function to select whether errors are to be
displayed during measurement.
•
NO Error messages shown only in the error list,
see Sect. 8.8
•
YES When errors occur during measurement,display
of the measured value will alternate with error
messages.
Installation and operating instructions BM 70 A/P
8.6.8 Current output I
Fct. 3.3.1. FUNCTION I
Use this function to select the measured variable.
•
OFF (= deactivated, the output supplies a constant 4
mA, e.g. necessary for HART
3.3.4 cannot then be selected, i.e. they are skipped
over).
•
LEVEL
•
DISTANCE
•
CONVERSION
•
REFLECTION
•
SW.OUTP. (function and switching threshold are set in
Fct. 3.6).
Fct. 3.3.2 RANGE I
Use this function to define the current in error condition.
E = Error at 2 mA or 22 mA.
•
4-20 mA (hold last measured value when error occurs)
•
4-20 mA/E=2 (min. 3.6 mA for Ex-i output!)
•
4-20 mA/E=22
Fct. 3.3.3 SCALE 4 mA
•
This function does not appear (is skipped over) when
"OFF" is set under Fct. 3.3.1.
•
This function is used for I min = 4 mA to define the
lower value for level, distance, conversion or reflection
(scaling 4 mA).
•
Setting LEVEL or DISTANCE under Fct. 3.3.1:
Setting range and unit for SCALE 4 mA same as for
Fct. 3.1.1 TANKHEIGHT. If a reference or tank bottom
offset is set, this must be allowed for!
•
Setting CONVERSION under Fct. 3.3.1:
Unit for SCALE 4 mA same as in Fct. 3.2.3
UNIT.CONV. But value must be smaller than the maxi-
mum value in the conversion table.
•
Setting REFLECTION under Fct. 3.3.1:
The setting range for SCALE 4 mA is 0...99.
Fct. 3.3.4 SCALE 20 mA
•
This function does not appear (is skipped over) when
"OFF" is set under Fct. 3.3.1.
•
This function is used für I
upper value for level, distance, conversion or reflection
(scaling 20 mA)
•
Setting LEVEL or DISTANCE under Fct. 3.3.1:
Setting range and unit for SCALE 20 mA as for Fct.
3.3.1 TANKHEIGHT. The value set here should not be
greater than the response threshold. (Response
threshold = tank height (Fct. 3.1.1) - block distance
(Fct. 3.1.2)). If a reference or a tank bottom offset is
set, this must be allowed for!
•
Setting CONVERSION
Unit for SCALE 20 mA same as in Fct. 3.2.3
UNIT.CONV. The value set here must be greater than
that of Fct. 3.3.3, otherwise error during Parameter
Check.
•
Setting REFLECTION under Fct. 3.3.1:
The setting range for I
max
The value set here must be greater than that of Fct.
3.3.3, otherwise error during Parameter Check.
Application and setting examples: see Sect. 8.5
Page: 47
®
Multidrop; Fct. 3.3.2 to
= 20 mA to define the
max
under Fct. 3.3.1:
= 20 mA is 1...100.
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