Fluidwell F090-A-PL, Руководство пользователя

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FW-F090-A-PL-M_v0403_07_EN.docx
Page 13
2 - BACKLIGHT
The functions below will only effect the optional LED-backlight.
BACKLIGHT
(OPTION)
21 If a LED backlight has been supplied, the color can be selected.
Following selections are available:
OFF - GREEN - AMBER
BRIGHTNESS
(OPTION)
22 The density of the backlight can be set in following range:
1 - 5
One is minimum and five is maximum brightness.
3 - SENSOR
FORMULA
31 The F090-A-PL can process the 4-20mA signal in two ways:
▪
Interpolation: the signal is processed linear
V = S x I
▪
Square root: for differential pressure
V = S
√
I
where:
V = Value: the calculated value
S = Span: the value at maximum signal (Span). The Span is
programmed with setting 14.
I = Input: the scaled analogue input value; in these formulas value 0
(zero) for (0)4mA and value 1 (one) for 20mA.
FILTER
32 The analogue output signal of a sensor does mirror a value. This value is
measured several times a second by the F090-A-PL. The value measured
is a "snap-shot" of the real signal as it will be fluctuating. With the help of
this digital filter a stable and accurate reading can be obtained while the
filter level can be set to a desired value.
The filter principal is based on three input values: the filter level (01-99),
the last measured analogue value and the last average value. The higher
the filter level, the longer the response time on a value change will be.
Below, several filter levels with there response times are indicated:
F
ILTER VALUE
R
ESPONSE TIME ON STEP CHANGE OF ANALOG VALUE
.
T
IME IN SECONDS
50%
INFLUENCE
75%
INFLUENCE
90%
INFLUENCE
99%
INFLUENCE
01 filter disabled filter disabled filter disabled filter disabled
02 0.3 seconds 0.5 seconds 1.0 seconds 1.8 seconds
03 0.5 seconds 1.0 seconds 1.5 seconds 3 seconds
05 1.0 seconds 1.8 seconds 2.8 seconds 5.3 seconds
10 1.8 seconds 3.5 seconds 5.6 seconds 11 seconds
20 3.5 seconds 7.0 seconds 11 seconds 23 seconds
50 8.8 seconds 17 seconds 29 seconds 57 seconds
75 13 seconds 26 seconds 43 seconds 86 seconds
99 17 seconds 34 seconds 57 seconds 114 seconds
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