Bronkhorst Multibus - Manual (Page 16)

BRONKHORST ®
Page 16 Operational instructions for digital multibus instruments 9.17.023
4 NORMAL OPERATION PARAMETERS
Data Type Range read/write Secured DDE Proc/par
4.1 M
EASURE UNIPOLAIR
unsigned int 0…41942 R N 8 1/0
4.2 M
EASURE BIPOLAIR
unsigned int 0…65535 R N 8 1/0
4.3 F
MEASURE
float -3.40282E+38 …
3.40282E+38
R N 205 33/0
Depending on the type of instrument, measured value indicates the amount of mass flow or pressure metered by the
instrument. Sensor signals at digital instruments will be digitized at the sensor bridge by means of highly accurate AD-
converters. Digitized signals will be internally processed by the microcontroller using floating point notation. The
sensor signal will be differentiated, linearized and filtered.
At the digital output measured values can be presented in three ways:
1. For Unipolair mode the signal of 0...100% will be presented in a range of 0...32000.
For the instruments, maximum signal to be expected is 131.07 %, which is: 41942.
0 32000 41942 65535
Not used
0% 100% 131.07%
2. For Bipolair mode the signal of 0...100% will be presented in a range of 0...32000.
Maximum signal is 131.07 %, which is: 41942, minimum signal is -73.73 %, which is 41943
0 32000 41942 41943 65535
0% 100% 131.07% -73.73% -0.003%
3. Fmeasure is a different parameter as Measure. It represents the internal floating point version of the variable
measure as mentioned before.
The users will read-out the measured value in the capacity and capacity unit for which the instrument has
been calibrated. These settings depend on variables: capacity, capacity unit, sensor type and capacity 0%.
Fmeasure is a read-only float on (FLOW-BUS) proc 33, par 0.
Value is calculated as follows:
in text
( )
capacity0% capacity0% capacity *
32000
measure
fmeasure + 





− =