KROHNE BM 70 M - Manual (Page 70)

70 BM 70 M
8.11 Calculation of the measured value
The following describes how the individual items of information are calculated from the measured
distance:
The measured primary distance is corrected by the offset and consequently standardised to the
reference point ( = flange).
The level is calculated as the difference between tank height and distance.
Optionally, distance, level or a converted function can be output to the signal output and the local
display.
All items of information can be accessed via the digital Communication. In addition, the measured
value can be shifted by a reference offset (reference point for distance not equal to flange) or by a
tank bottom offset (reference point for level not equal to tank bottom).
8.12 User program PC-CAT for Windows
Our instruments of the BM 70 product line are easy to install. To facilitate configuration, each unit
is supplied with the intuitive and time-tried software, PC-CAT for Windows.
PC-CAT provides a number of useful features including:
• Quick on-site configuration
• Print-out of configuration protocol
• Simple conversion, volume or correction tables
• Check routine to monitor functionality of the instrument
• Monitoring and recording of the radar signal during operation
• Trend and evaluation of the signal during operation
PC-CAT works on all IBM-compatible PC’s using Windows 9x or NT.
PC-CAT Version 4.01 and higher can communicate with all current KROHNE level radar gauges
including BM 70 M versions, also with HART
®
protocol and RS 485. The PC-CAT kit includes a
PC adapter for current output. The adapter can be connected to the PC’s standard RS 232
interface.
measured
(internal)
Offset
Distance
+
–
Level
+
tank height
Fct 3.1.1
– conversion
table
+
+
+
+
Ref.Offset
Fct 3.1.7 TB Offset
Fct 3.1.8
Fct 3.2.1
display
BM 70 local display
function
distance
BM 70
Fct 3.3.1
I output
BM 70 current output
function
BM 70 digital
communication