FW_F126PELTP_v1702_02_EN
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3.1.9.
EXPLANATION OF SETUP MENU 7 - FORMULA
EQUATIONS TYPE
71
This setting shows the formula. The type EL stands for Equations Liquid - flow
computer for corrected liquid volume.
The formula use[d] Qnormal = Q * (1 +
(Tnormal - T)) where:
Qnormal : calculated volume at reference conditions
Q
: measured volume
: thermal expansion coefficient
Tnormal : reference temperature
T
: measured temperature
THERMAL EXPANSION
COEFFICIENT
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Enter here the thermal expansion coefficient
for the liquid used. The value to be
entered has to be multiplied with 1000. The decimal position is fixed but cannot be
shown: x,xxxxxx.
With the default value of 0.000000 the volume correction is disabled.
Examples: Calculation of the thermal expansion coefficient
for water is 0,00031 per K. Enter: 0310000.
for petrol is 0,00110 per K. Enter: 1100000.
NORMAL TEMPERATURE
73
Enter here the reference temperature T
normal
in degrees Kelvin (K). In most
applications, the volume has to be calculated at 15°C which is 288,15 K.
3.1.10.
EXPLANATION OF SETUP MENU 8 - ANALOG
A linear 4-20mA signal (option AB: 0-20mA or option AU: 0-10V) output signal is generated that
represents the flow rate. The settings for the flow rate influence the analog output directly. The
relationship between the flow rate and the analog output is set with the following settings.
OUTPUT
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If the analog output is not used, select disable to minimize the power
consumption (e.g. save battery life-time).
Option AP: When a power supply is available but the output is disabled, a
3.5mA signal will be generated.
RATE-MIN
82
Enter here the flow rate at which the output should generate the minimum
signal (0)4mA or 0V - in most applications at zero flow. The number of
decimals shown depend upon setup 23. The engineering units/time (e.g.
L/min) are dependent upon setup 21 and 22.
RATE-MAX
83
Enter here the flow rate at which the output should generate the maximum
signal (20mA or 10V) - in most applications at maximum flow. The number
of decimals shown depend upon setup 23. The engineering units/time (e.g.
L/min) are dependent upon setup 21 and 22.
CUT-OFF
84
To ignore leakage of the flow for example, a low flow cut-off can be set as
a percentage of the full range of 16mA, 20mA or 10V.
When the flow is less than the required rate, the current will be the
minimum signal (0)4mA or 0V.
Example:
Calculate the cut-off.
Rate-min: 0L/min [4mA], Rate-max: 100 L/min [16mA], Cut-off: 2%
Required rate [L/min]:
(rate-max - rate-min)*cut-off: (100-0)*2%=2.0L/min
Output [mA]:
rate-min + (rate-max*cut-off): 4+(16*2%)=4.32mA
TUNE-MIN
85
The (0)4mA or 0V value can be tuned precisely with this setting. The initial
minimum analog output value is (0)4mA or 0V. However, this value might
differ slightly due to ambient influences such as temperature for example.
Before tuning the signal, make sure that the analog signal is
idle (not used) for any application!
After pressing PROG, the current will be about 4mA (0mA or 0V). The
current can be increased / decreased with the arrow keys and is directly
active. Press ENTER to store the new value.
If required, you can program the analog output 'up-side-down'. The
(0)4mA
or 0V
represents the maximum flow rate and the 20mA or 10V represents
the minimum flow rate.
Содержание F126-P-EL-TP
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