KROHNE BM 70 M - Manual (Page 48)

48 BM 70 M
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.
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 ® Multidrop;
Fct. 3.3.2 to 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
maximum 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 for I max = 20 mA to define the 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 under Fct. 3.3.1:
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 = 20 mA is 1...100.
The value set here must be greater than that of Fct. 3.3.3, otherwise error during Parameter
Check.