FW_F113A_v1901_02_EN.docx
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3.1.6.
EXPLANATION OF SETUP-MENU 5 - POWER MANAGEMENT
When used with the internal battery option (type PB/PC), the user can expect reliable measurement
over a long period of time. The F113-A has several smart power management functions to extend
the battery life time significantly. Two of these functions can be set.
LCD NEW
51
The calculation of the display-information influences the power
consumption significantly. When the application does not require a fast
display refresh rate, it is strongly advised to select a slow refresh rate.
Please understand that NO information will be lost; the signal will be
processed and the output signals will be generated in the normal way.
At a key press, the display refresh rate will switch to FAST for 30
seconds. When 'OFF' is selected, the display goes off after 30 seconds
after the last key press. The display temporarily comes on after a key
press.
Example battery life-time:
battery life-time with a FAST update: about 3 years.
battery life-time with a 1 sec update: about 5 years.
BATTERY MODE
52
The F113-A has two modes: operational or shelf.
After "shelf" has been selected, the F113-A can be stored for several years; it will
not process the sensor signal; the display is switched off but all settings and totals
are stored. In this mode, power consumption is extremely low.
To wake up the F113-A again, press the SELECT/
key two times.
3.1.7.
EXPLANATION OF SETUP-MENU 6 - FLOWMETER
FORMULA
61
The F113-A can process the (0)4-20mA signal in two ways:
Interpolation or Square root:
•
Interpolation: the signal is processed linear:
R = S x I
•
Square root: for differential pressure:
R = S
√
I
where:
R
= Rate: the calculated flow rate
S
= Span: the maximum flow rate at 20mA. The span is programmed with
setting 24 for flow rate and with setting 13 for total.
I
= Input: the scaled analog value; in these formulas value 0 (zero) for
(0)4mA and value 1 (one) for 20mA.
FILTER
62
The analog output signal of a sensor represents the actual temperature.
This signal is measured several times a second. The value measured is a
"snap-shot" of the real temperature 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 analog value and the last average value. The higher
the filter level, the longer the response time on a value change will be.
CUT-OFF
63
To ignore e.g. leakage of the flow or vibration, a low-flow cut-off can be
set as percentage over the full range of 16mA (or 20mA / 10V). When the
analog value is less than the programmed percentage, with this setting,
the flow rate will be set to zero. The cut-off value can be programmed is
the range 0.0 - 99.9%.
