KROHNE BM 102 Handbook - Manual (Page 36)

36 BM 102
How to set an analogue current output scale
User menu functions 1.3.1 to 1.3.4
This set of functions allows users to set up a scale. The minimum (4mA) and maximum (20mA)
values of an analogue current output should ideally lie within the device’s active measuring zone,
as the device will freeze when the signal is lost.
Refer to the measurement limits table for each probe type in the introduction. Refer also to the
start of section 3.3.3 for the advantages of changing tank height.
Example procedure 2 (using PCSTAR 2):
To personalise a measurement scale
• select “Level” as the current output parameter for the scale to be set up from the tank bottom
• select 4 … 20 mA current range with an error output at 22 mA
• choose suitable minimum and maximum values for the scale.
Step
Action Data entered / value set
1 Press F2 to connect to the device Tank status screen displayed (level reads
5650 mm)
2 Press F2 to enter configuration menu Configuration menu displayed
3 Scroll down the screen and click on
the data set field for Fct. 1.3.1:
Current 1 item. This will reveal a
scroll menu. This field currently reads “distance”
4 Use mouse to scroll down data set
field. Click on the new value. This field now reads “level”
5 Scroll down to Fct. 1.3.2: Current 1
range and click on data set field. This
reveal a scroll menu. This field currently reads “4-20 mA”
6 Use mouse to scroll down data set
field. Click on the new value. This field now reads “4-20 mA / E = 22 mA”
7 Scroll down to Fct. 1.3.3: Scale I1 min
and click on data set field. This field currently reads “0000 mm”
8 Enter the new value. This will give the
level that corresponds to the
minimum output of 4 mA. This field now reads “1000 mm”
9 Scroll down to Fct. 1.3.4: Scale I1
max and click on data set field. This field currently reads “6000 mm”
(std. default: 6000 mm)
10 Change to 8850 mm. This will give
the level that corresponds to the
maximum output of 20 mA. (and sets
max. output at the top dead zone
limit) This field now reads “8850 mm”
11 Press F6-Send to BM102 to
immediately update the device
configuration. n/a
12 Press F3-Exit to quit the configuration
menu screen. Tank status screen displayed (level reads
5650 mm)
Setting up a volume table
Refer to procedure 3.