13 Advanced Measuring Functions
UMFLUXUS_G8V4-6-1EN, 2018-10-10
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13.8.3
Output Options for a Calculation Channel
Make sure that the physical quantity selected for the calculation channel can be calculated from the physical quantities of
the selected measuring channels. Possible combinations are shown in Tab. 13.3.
Three scroll lists are displayed in the upper line:
• selection of the first measuring channel (
ch1
)
• selection of the calculation function (
funct
)
• selection of the second measuring channel (
ch2
)
Select a scroll list with key
.
The list items are displayed in the lower line.
Press key
to scroll through the scroll list. All measuring channels and their absolute val-
ues can be used as input channels for the calculation.
The following calculation functions are available:
• -: Y = ch1 - ch2
• +: Y = ch1 + ch2
•(+)/2: Y = (ch1 + ch2)/2
•(+)/n: Y = (ch1 + ch2)/n
•|-|: Y = |ch1 - ch2|
Press ENTER.
This message will be displayed after the parameterization of the calculation channel if the
calculation function
(+)/2
is selected. The measured values of the calculation channel
(here:
Y
) will be valid if the measured values of both measuring channels (here:
A
and
B
)
are valid. If only one measuring channel provides valid measured values, the measured
values of the calculation channel will be invalid.
This message will be displayed after the parameterization of the calculation channel if the
calculation function
(+)/n
is selected. The measured values of the calculation channel
(here:
Y
) will be valid if the measured values of at least one measuring channel (here
A
or
B
) are valid. If only one measuring channel provides valid measured values, these mea-
sured values will be used for the calculation channel.
Select a calculation channel in the program branch
Output Options
.
Press ENTER.
Select the physical quantity to be calculated. Press ENTER.
Tab. 13.3: Physical quantity of the calculation channel
physical quantity of the calculation
channel
possible physical quantity of
the first measuring channel (CH1)
possible physical quantity of
the second measuring channel (CH2)
flow velocity
vo
lumetric
flo
w
ra
te
ma
ss
flow
ra
te
flow velocity
vo
lumetric
flo
w
ra
te
ma
ss
flow
ra
te
flow velocity
x
x
x
x
x
x
volumetric flow rate
x
x
x
x
mass flow rate
x
x
x
x
Example:
The difference of the volume flow rates of the channels A and B is to be calculated.
The physical quantity of channel A and B can be the volumetric flow rate or the mass flow, but not the
flow velocity. The physical quantities of the two measuring channels do not need to be identical (chan-
nel A = mass flow, channel B = volumetric flow rate).
>CH1< funct ch2
↕
A - B
Y: is valid if
A: and B: valid
Y: is valid if
A: or B: valid
Output Options
↕
for Channel
Y:
Physic. Quant.
↕
Mass Flow
