FW_F112A_v1702_02_EN
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3.1.4.
EXPLANATION OF SETUP-MENU 3 - DISPLAY
FUNCTION
31
This setting can be set to display (linearized) total or (linearized) rate.
When 'total' is selected, simultaneously, total is shown with the large
digits and flow rate with the smaller digits. When SELECT is pressed,
the accumulated total is shown temporarily.
When 'rate' is selected, only flow rate will be shown with the large
digits together with its measuring unit. When SELECT is pressed, the
total and the accumulated total are shown temporarily.
LIGHT
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The backlight brightness can be adjusted from 0% (off) to 100% (full
brightness) in steps of 20%.
When the F112-A is only loop powered, the backlight is disabled. An
external power supply is required to supply the backlight.
3.1.5.
EXPLANATION OF SETUP-MENU 4 - 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 F112-A has several smart power management functions to extend
the battery life time significantly. Two of these functions can be set.
LCD NEW
41
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; every pulse will be
counted 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 with a coil pick-up:
FAST update: about 2 years;
1 sec update: about 5 years.
BATTERY MODE
42
The F112-A has two modes: operational or shelf.
After "shelf" has been selected, the F112-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 F112-A again, press the SELECT/
key two times.
3.1.6.
EXPLANATION OF SETUP-MENU 5 - FLOWMETER
FORMULA
51
The F112-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
52
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
53
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%.
E
XAMPLE
:
