Page 13
FW_B-SMART_v0306-01_EN.docx
2.5
K-FACTOR DECIMALS
This decimal point determines for K-Factor (SETUP 2.4) the number
of digits following the decimal point.
The following can be selected:
0
– 0.1 – 0.02 – 0.003 – 0.003 – 0.0004 – 0.00005 – 0.000006
3.3.4
MENU 3
– METER (FLOWMETER)
3
METER (flowmeter)
3.1
SIGNAL
The B-SMART is able to handle several types of input signal. The type of
flowmeter pickup / signal is selected with SETUP 3.1.
TYPE OF SIGNAL
EXPLANATION
RESISTANCE
FREQ. / mVpp
REMARK
NPN
NPN input
100
kΩ pull
-up
max. 6 kHz.
(open collector)
REED
Reed-switch input
1
MΩ pull
-up
max. 120 Hz.
PNP
PNP input
47
kΩ pull
-down
max. 6 kHz.
NAMUR
NAMUR input
820
Ω pull
-down
max. 4 kHz.
External power
required
COIL
Coil input
-
min. 30 mVpp
-
3.3.5
MENU 4
– A-OUT (ANALOG OUTPUT)
An analog 4-20mA signal is generated according to the flowrate with a 10 bits resolution. The
settings for Flowrate (SETUP-menu 2) influence the analog output directly and should be configured
first. The relationship between rate and analog output is set with the following functions.
4
A-OUT (analog output)
4.1
OUTPUT
If the analog output is not used, it can be disabled to minimize power
consumption to safe battery life. When the output is disabled, the
current will be less than 3.4mA and the unit can still be supplied from
this signal (provided a power supply is connected).
The following can be selected:
enable
– disable
While powering-up the loop, the initial current is approx. 3.3mA.
When the output is enabled, it can take a few seconds to settle.
4.2
RATE-MIN (4mA)
Enter here the flowrate at which the output should generate the
minimum signal (4mA)
– in most applications at flowrate “0”.
The number of decimals displayed depend upon SETUP 2.3.
The time and measuring units (L/min for example) are dependent
upon SETUP 2.1 and SETUP 2.2 and are displayed during editing.
If desired, you can program the analog output 'up-side-down'. The
4mA
represents the maximum flow rate.
For example do enter 800 L/min.
4.3
RATE-MAX (20mA)
Enter here the flowrate-at which the output should generate the
maximum signal (20mA)
– in most applications at maximum flow.
The number of decimals displayed depend upon SETUP 2.3.
The time and measuring units (L/min for example) are dependent
upon SETUP 2.1 and SETUP 2.2 and are displayed during editing.
If desired, you can program the analog output 'up-side-down'. The
20
mA
represents the minimum flow rate.
For example do enter 0 L/min.
