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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 MEASURE UNIPOLAIR

unsigned int

0…41942

1/0

4.2 M

EASURE BIPOLAIR

unsigned int

0…65535

1/0

4.3 F

MEASURE

float

-3.40282E+38 …

3.40282E+38

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 usi

ng 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 +













−=

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 49 50

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