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UMG70XV3-4EN 12.01.2009 101
11 Displaying the Measured Values
11.1.1 Measurement of the Standard Volume Flow
If the medium is a gas, the standard volume flow can be selected as physical quantity ad-
ditionally to the operating volume flow. The standard volume flow will be calculated as
follows:
V
N
= V * p/p
N
* T
N
/T * 1/K
V
N
- standard volume flow
V - operating volume flow
p
N
- standard pressure (absolute value)
p - operating pressure (absolute value)
T
N
- standard temperature in K
T - operating temperature in K
K - compressibility factor
The pressure p
N
and the temperature T
N
under standard conditions will be entered in
SPECIAL FUNCTION\SYSTEM SETTINGS\GAS-MEASURING
in the menu items
NOR-
MAL PRESSURE
and
NORMAL TEMPER.
If the operating pressure p and the operating temperature T are measured and fed to the
flowmeter, they will be used for the calculation of the standard volume flow. Otherwise,
they will be entered in the program branch
PARAMETER
under
FLUID PRESSURE
and
MEDIUM TEMPERAT.
The gas compressibility factor is stored in the medium data set. If
OTHER MEDIUM
is se-
lected or a data set for the selected medium does not exists, the compressibility factor
will be entered in the program branch
PARAMETER
under
GAS COMPR.FACTOR
. Take
care that the value is selected corresponding to the operating pressure, the operating
temperature and the composition of the gas.
11.2 Toggling between the Channels
If more than one channel is existing/activated, the display for the measured values can
be adapted as follows:
• AutoMux mode
- all channels
- only calculation channels
• HumanMux mode
The mode will be changed with key .
11.2.1 AutoMux Mode
In AutoMux mode, the display and the measuring process are synchronized. The chan-
nel on which is being measured will be displayed left in the upper line.
The measured values will be displayed as configured in the program branch
OUTPUT
OPTIONS
(see section 11.1). When the multiplexer switches to the next channel, the dis-
play is actualized.
M U X
A:Volume(oper.)
54.5 m3/h
B:Flow Velocity
1.25 m/s