KITA KF02 Series User manual

INSTRUCTION MANUAL
KF02 Series
DIGITAL FLOW SENSOR
@2021 KITA Sensor Tech. Co., LTD. URL http://www.kita.com.tw

@2021 KITA Sensor Tech. Co., LTD. URL http://www.kita.com.tw
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KF02 Series Instruction Manual
Product Safety Instructions
■This section indicate the levels of risks with the labels of Danger, Warning and Caution.
Danger indicates high level of risk, will lead to fatal or serious injuries if not
avoided.
Warning indicates medium level of risk, it might cause death or serious injuries.
Caution indicates low level of risk, it might result in minor injuries, such as scald,
electric shock, etc. and the product, equipment and machines might be damaged.
Danger
Warning
Warning
Caution
■ Precautions for use
Operated within the specified voltage.
Malfunction or damaged product, electric shock or fire may
be resulted by exceeding the specified voltage range.
Do not exceed the maximum load current.
It may damage the product.
Do not use any load that generates surges.
Surge protection is present but applying surge voltage
repeatedly will ultimately damage the product.
When using with inductive load (such as relay or solenoid),
please install a flyback diode across the load (polarity must
be observed).
Observed the internal voltage drop.
When used at a specified voltage, if the sensor is functional
but the load does not work, please check if the operating
voltage of the load meets the following formula.
Power Supply – Internal voltage > Minimum operating
voltage drop of sensor voltage of load
Do not operate the product outside the specifications.
The sensor will be damaged by exceeding the flow rate and
working pressure.
Do not use flammable fluids and/or permeable fluids.
They may cause fire, explosion or corrosion.
➀
➁
➂
➃
➄
➅
■ Working fluid and working environment
Do not use in an explosive gas atmosphere.
The sensor does not have explosion-proof structure, fire,
explosion or corrosion can result.
Do not use near a surge voltage generated area.
Solenoid lifters, high frequency induction furnaces and
motors, etc. can generate high surge voltages, if using near
the sensor will cause the internal circuit components to
deteriorate and cause damages.
Sensors can not withstand lightning strikes.
The product is CE compliant, but can not resist surge
voltage of lightning strikes, take measures to avoid
lightening strikes in the system.
Do not use in an environment where sensors could
be splashed by water or oil.
Enclosure rating is IP40, please avoid water or oil splashed
environment to prevent adversely effects.
Do not use in an environment subject to large
temperature cycling.
Internal components of the sensor will be affected adversely
by large heating/cooling cycles other than ordinary changes
in temperature.
Do not mount the product in locations where it is
exposed to radiant heat.
This could result in damage and/or malfunction.
➀
➁
➂
➃
➄
➅

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KF02 Series Instruction Manual
■ Installation Precautions
Ensure the flow direction of the fluid.
Please follow the flow direction indicator for installation and
piping.
Flush out all dirt and dust by air blow before connect
the piping to the sensor.
Do not drop or hit.
When installation, do not drop, hit or apply excessive shock
(100m/s2). Internal damage can cause malfunction even if
the housing appears to be undamaged.
Do not install multiple products in close proximity.
The heat generated from each product could cause the
temperature to rise and change the characteristics of
product or deterioration of the plastic parts. Please set the
products 10mm apart from each other.
Hold the sensor body when installing.
The tensile strength of the cable is 24.5 N and apply
excessive pulling force can cause damage to the sensor.
➀
➁
➂
➃
➄
■ Other Precautions
After power is supplied, the output will remain off until
the display is turned on. Please operate the sensor
after the value is shown.
Stop the control systems before perform setting
changes.
During the initial flow and pressure setting, the product will
switch the output according to the existing settings until the
changes are complete.
➀
➁
■ Installation Precautions ■ Maintenance Precautions
Do not insert a stick or wire into the piping ports.
Do not touch the terminals or connectors when power
is on.
➀
➁
■ Wiring Precautions
Warning
Caution
Check wire color and terminal number when wiring.
Incorrect wiring can cause permanent damages to the
sensor, check wire color and terminal number against the
manual before wiring.
Avoid repeatedly bending or stretching the lead wire.
It can cause damage to the sheath, or breakage of the
wire.
Confirm wiring insulation
Please avoid poor insulations (and interference from
another circuit, poor insulation between terminals, etc.) it
can lead to over current being applied to the product,
causing damage.
Do not route wires and cables together with power or
high voltage cables.
The product may malfunction due to interference or noise
and surge voltage from power and high voltage cables.
Do not short-circuit the load.
When the load is short-circuited, an error will be displayed.
But excess current may cause damage to the sensor.
Do not connect wire when the power is on.
It may cause damages to the sensors/equipment/machines.
RS485 products must be connected the communica-
tion wire first.
To prevent product damage due to short circuit , MUST do
RS485 line conneciton BEFORE power line connection.
➀
➁
➂
➃
➄
➅
➆
Please follow the specified tightening torque.
Over tighten will damage the product.
Do not mount the sensor in a place that will be used
as a foothold.
The product may damage if sit or step on it accidentally.
While installing the KF02 to the pipe, please apply
I.D. 9 mm or more air tube.
➀
➁
➂
■ Disposal
Sensors at end-of-life must be disposed of in accor-
dance with E-Waste regulations of the country/region,
NOT disposed of with regular garbage.
➀

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KF02 Series Instruction Manual
■ Fluid
Disclaimer
Check the regulator and flow adjustment valve before
introducing the fluid.
If the pressure or flow rate exceeded the specified range,
the sensing element may be damaged.
Recommended Equipments and Installation
Our warranty applies solely to our product, not to any other damages and injuries which occur by earthquakes,
fires, the acts by third party, other matters, acts intentionally, acts accidentally, misuse, or other abnormal conditions
that are not the responsible of KITA.
Our warranty applies solely to our product, not to any other additional damages (the loses of business profits,
business interruption, etc.) incurred due to using or misusing the product.
Our warranty excludes any injuries and damages happened by using the product beyond the specified range of
catalog or/and not following the instruction manual.
➀The sensing element cannot measure properly if
foreign matter adheres to it.
On the inlet side, be sure to install an air filter below
the filtration level of 10um.
➁
➂
➃
➀
➂
➁
Air Source
Filter
Regulator
Micro Mist Separator
(Oil Mist Filiter)
Air Dryer
KF02 Series
Flow Sensor
※NOTE：
Please install a throttle valve on the outlet side of the sensor to prevent errors caused by unstable flow.
Inlet
Outlet
Throttle Valve
Warning

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Contents
KF02 Series Instruction Manual
[ CONTENTS ]
1. Installation Instructions ................................................................................... 5
1.1 Piping .......................................................................................................... 5
1.2 Mounting bracket ...................................................................................... 6
1.3 Wiring .......................................................................................................... 7
1.3.1 NPN output, Analog output and external input ....................... 7
1.3.2 PNP output, Analog output and external input ....................... 8
1.3.3 NPN output, RS-485 Modbus .................................................... 9
1.3.4 PNP output, RS-485 Modbus .................................................... 9
2. How to Use ....................................................................................................... 10
2.1 Names and Functions of Individual Parts .......................................... 10
2.2 Functions Instructions ............................................................................ 11
2.3 Operation Setting .................................................................................... 13
3. Modbus RTU Instruction ................................................................................ 40
4. Error Code Instruction .................................................................................... 42
5. Specifications.................................................................................................... 43
6. Pressure Loss Characteristics ..................................................................... 44
7. Thermal Mass Principles of Flow Sensor .................................................. 44
8. Ordering Information ...................................................................................... 45
9. Dimensions ....................................................................................................... 46
10. Internal Structure ........................................................................................... 48

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Installation
KF02 Series Instruction Manual
1Installation
1.1 Piping
Install the pipe by following
the arrow indication that
shows the air flow direction
on the product.
Use straight piping 8cm or longer (I.D. 9 mm or more) to connect the
Piping Port (Inlet side). If straight piping is not installed, the accuracy
may vary by ± 2% F.S..
Avoid sudden changes in the piping size on the inlet side of the product.
Do not release the outlet side piping port of the product directly to the
atmosphere without the piping connected.
※Straight Piping: The pipe is without bending and the cross sectional areas of the
pipe keeps the same.
When piping with metallic area, please refer to
the applicable torque below.
Over torquing may be damaged the product.
When insufficient torque, the connection may
loosen to cause air leakage.
After installation completed, please make gas
and power on and operate properly and test
leakage to verify the installation correct.
Flow direction
Piping Port
(Inlet side)
straight piping 8cm
or longer
(I.D. 9 mm or more)
Piping Port
(Outlet side)
Caution
Piping Specification
Rc1/2, G1/2
Rc3/4, G3/4
Required Torque
28 ~ 30 N.m

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Installation
KF02 Series Instruction Manual
1.2 Mounting Bracket / Optional Parts
The LCD display may be difficult to see at certain angles.
The sensor can be installed horizontally or vertically, but the flow rates
may change because of the installation way of the product or piping.
The tightening torque for screws should be under 0.3 ±0.1 N.m.
Mounting screw
M3 x 0.5P x 5L
Mounting screw

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Installation Instructions
KF02 Series Instruction Manual
1.3 Wiring Diagrams
1.3.1 NPN Output, Analog Output and External Input
● NPN Output / Analog Voltage Output / External Input
● NPN Output / Analog Current Output / External Input
Main CircuitMain Circuit
1
2
3
4
5
6
Brown (Power supply +)
Brown (Power supply +)
Blue (Power supply –)
Blue (Power supply –)
Black (Output 1)
Black (Output 1)
White (Output 2)
White (Output 2)
Yellow (External input)
Yellow
(External input)
1kΩOrange
(Analog output)
Orange
(Analog output)
1
2
3
4
5
6
Load
Load
Load
Load
Load
Brown
Orange
Yellow
Black
White
Blue
Pin No. Line color Content
1 Brown Power supply (DC 12 to 24V DC)
4 Black Output 1 (Max. load current：125mA)
5 White Output 2 (Max. load current：125mA)
3 Yellow External input
2 Orange Analog voltage output：1 ~ 5V
Analog current output：4 ~ 20mA
6 Blue 0V (GND)
1
2
3
4
5
6

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Installation Instructions
KF02 Series Instruction Manual
● PNP Output / Analog Voltage Output / External Input
● PNP Output / Analog Current Output / External Input
1
2
3
4
5
6
Brown (Power supply +)
Brown (Power supply +)
Blue (Power supply –)
Blue (Power supply –)
Black (Output 1)
White (Output 2)
Black (Output 1)
White (Output 2)
Yellow (External input)
Yellow
(External input)
Orange
(Analog output)
Orange
(Analog output)
1
2
3
4
5
6
1kΩ
1.3.2 PNP Output, Analog Output and External Input
Brown
Orange
Yellow
Black
White
Blue
Pin No. Line color Content
1 Brown Power supply (DC 12 to 24V DC)
4 Black Output 1 (Max. load current：125mA)
5 White Output 2 (Max. load current：125mA)
3 Yellow External input
2 Orange Analog voltage output：1 ~ 5V
Analog current output：4 ~ 20mA
6 Blue 0V (GND)
1
2
3
4
5
6
Main CircuitMain Circuit
Load
Load
Load
Load
Load

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Installation Instructions
KF02 Series Instruction Manual
1.3.3 NPN Output, RS-485 Modbus
Brown
Orange
Yellow
Black
White
Blue
Pin No. Line color Content
1 Brown Power supply (DC 12 to 24V DC)
4 Black Output 1 (Max. load current：125mA)
5 White Output 2 (Max. load current：125mA)
3 Yellow RS-485 (A-)
2 Orange RS-485 (B+)
6 Blue 0V (GND)
1
2
3
4
5
6
Main Circuit
Brown (Power supply +)
Blue (Power supply –)
Black (Output 1)
White (Output 2)
Yellow
RS-485 (A-)
Orange
RS-485 (B+)
1
2
3
4
5
6
Load
Load
1.3.4 PNP Output, RS-485 Modbus
1
2
3
4
5
6
Brown (Power supply +)
Blue (Power supply –)
Black (Output 1)
White (Output 2)
Yellow
RS-485 (A-)
Orange
RS-485 (B+)
Main Circuit
Load
Load

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How to Use
KF02 Series Instruction Manual
OUT1 OUT2 ft3/min
Pulse
mL
3
/min
2 How to Use
2.1 Names and Functions of Individual Parts
Setting Button
Use for selection each mode
and set value confirmation.
▼Button
▲Button
Use for mode selection,
ON/OFF switching and
set value adjustment.
Use for mode selection,
ON/OFF switching and
set value adjustment.
Lead Wire
Connector
Piping Port (Inlet side)
Output 1 Indicator
4-Digit LCD Flow Display
8-Digit LCD Accumulated Flow Display
Button
Button
Flow Direction Symbol
Output 2 Indicator
Flow Unit Display Section
Flow Unit Display SectionModbus Symbol
Setting Button
Symbol flashing when MODBUS data is transmitted.
Piping Port
(Outlet side)
LCD Display
Body
Connector

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How to Use
KF02 Series Instruction Manual
2.2 Function Instruction
● Function Setting Mode
Item Default setting Explanation
[F-01]
[F-02]
[F-03]
[F-04]
[F-05]
[oUt1] OUT1 setting
[oUt2] OUT2 setting
[CLor] LCD Display setting
[rESP]
Response time selection
[UPdA] Display refresh time
selection
Set Output 1 flow value to
switch ON/OFF.
Set Output 2 flow value to
switch ON/OFF.
Select back light color and
display mode.
Select the response time in 50ms,
80ms, 120ms, 200ms, 400ms or
1500ms for analog output.
Display refresh cycle can be
set in 200ms, 500ms or 1000ms.
[oUt1] OUT1 output type
[FL-1] OUT1 set value input
[FH-1] OUT1 set value input
[FLo ] OUT1 output mode
CLor
[diSP] LCD Display
corresponding to output
oUt1
[ CoL] LCD Display color
selection SoG
rESP
[rESP] Response time selection 800 (ms)
Function
Code
oUt1
oUt2
[FLo ] OUT2 output mode HYS
[oUt2] OUT2 output type no
[FL-2] OUT2 set value input
50% of maximum measured flow rate
501：250 L/min
102：500 L/min
202：1000 L/min
[FH-2] OUT2 set value input
60% of maximum measured flow rate
501：300 L/min
102：600 L/min
202：1200 L/min
no
50% of maximum measured flow rate
501：250 L/min
102：500 L/min
202：1000 L/min
60% of maximum measured flow rate
501：300 L/min
102：600 L/min
202：1200 L/min
HYS
UPdA
[UPdA] Display refresh time of
flow sensor selection 500
(ms)
[F-06][Unit] Unit selection
Select the UNIT of flow sensor.
Unit
[FLo ] Flow unit selection LPn
[rEFE] Flow reference standard
selection
Select the flow value is shown
under standard (ANR) or
normal condition (NOR).
[rEFE] Flow reference standard
selection
rEFE
Anr
[F-07]

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How to Use
KF02 Series Instruction Manual
● Measurement Mode
Item Explanation
Flow display
Accumulated flow rate display
Instantaneous Flow rate zero setting
Accumulated flow rate zero clear
Peak value display
Bottom value display
Key lock/unlock mode
Display instantaneous flow rate.
Display accumulated flow rate.
The displayed instantaneous flow rate value can be adjusted to "0".
The accumulated flow rate can be set to "0".
The maximum pressure or instantaneous flow can be detected when
the power is supplied for a period.
The minimum pressure or instantaneous flow can be detected when
the power is supplied for a period.
To prevent errors occurring due to unintentional changes of the set values.
Item Default setting Explanation
[F-08]
[F-09]
[F-10]
[F-91]
[F-92]
[F-94]
[F-95]
[F-99]
[rotA] Display rotation
[EEPr]
Accumulated value hold selection
[ diS] Flow sensor display mode selection
[ ECo] Power-Save mode selection
[ inP] External input selection
[FinE]
Fine adjustment Setting
[FoUt] Forced output function
[rESt] Reset to the default setting
Set Display Rotation.
To save the last accumulated flow value
every 2 or 5 minutes.
Select to display Instantaneous Flow or
Accumulated Flow Mode.
Select if turn on power-save mode to
reduce power consumption
Select for Accumulated flow rate zero
clear, Auto-Shift or Auto-Shift zero.
The displayed value can be adjusted slightly.
To force output ON/OFF to test the
switch function.
Return to the factory default setting.
rotA
oFF
EEPr
[rotA] Output selection
[EEPr] Accumulated value hold selection
oFF
diS
[ dSP] Flow sensor display mode selection
inS
ECo
[ ECo] Power-Save mode selection no
inP
[ inP] External input selection
[F-93]
[nbUS] Modbus RTU setting
Set ID number, baud rate and transmission
format.
rESt
[ rSt] Reset to the default setting oFF
Function
Code
r r
nbUS
[id] ID number setting 1
[rAt] Baud rate setting 96 (9600 Bd)
[For] Transmission format setting n81
[trA] Communications protocol
setting rtU
FinE
[FinE]
Fine adjustment Setting
oFF
FoUt
[oUt1] Forced output function oFF
[oUt2] Forced output function oFF

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How to Use
KF02 Series Instruction Manual
At Measurement Mode, press button for more than 3 sec. to display
[F-01]. Press or button to select other setting functions.
Press for 3 sec. at Function Setting Mode to return to Measurement
Mode.
2.3 Operation Instructions
Function Selection Mode
Measurement Mode
Function Selection Mode
Press button for
more than 3 sec.
Enter in each function setting
Press button
L/min
Flashing
alternately
L/min
L/min
L/min L/min
L/min L/min
Flashing
alternately
Flashing
alternately

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How to Use
KF02 Series Instruction Manual
2.3.1 [F-01] OUT1 Setting Selection
Press or button at Function Setting Mode to display [F-01] [oUt1].
Press button
Output Mode Setting
Select output mode：
Press or button to select output
mode of OUT1.
4 output modes included.
Hysteresis Mode
※NOTE：The Accumulated Pulse Output Mode can only be set in OUT1, and OUT2 does not have this setting.
Flow Sensor Selected Mode
Window Comparator Mode Accumulated Output Mode Accumulated Pulse
Output Mode
L/min
L/min
Flashing
alternately
L/min L/min
Flashing
alternately
L/min
L/min
Flashing
alternately
L/min
L/min
Flashing
alternately
L/min
Pulse
L/min
Flashing
alternately
NO mode NC mode
Output Type Setting
OUT1 type setting :
Press or button to select OUT1
type.
※NOTE：Type setting will not display when Accumulated Pulse Output Mode is set.
Selected Output Selected Mode
L/min L/min
Flashing
alternately
L/min
L/min
Flashing
alternately
OUT1
L/min
OUT1
L/min
Flashing
alternately
Press button

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How to Use
KF02 Series Instruction Manual
Fixed Hysteresis Setting
Fixed hysteresis setting :
Press or button to adjust fixed
hysteresis value.
※NOTE：Fixed hysteresis setting will not display when Hysteresis Mode, Accumulated Output Mode and
Accumulated Pulse Output Mode is set.
Fixed Hysteresis
Mode
Set Value
L/min L/min
Flashing
alternately
L/minL/min
Flashing
alternately
Set Value Setting
OUT1 set value setting :
Press or button to adjust the set
value.
Hysteresis Mode [HYS]：[FL-1]，[FH-1]
Window Comparator Mode ：[FL-1]，[FH-1]
Accumlated Output Mode [ADD]：[AdL1]，[AdH1]
※NOTE：Set value setting will not display when Accumulated Pulse Output is set.
Selected Mode Set Value
L/min L/min
Flashing
alternately
(to be continued)
Press button
Press button
Press button to return to
Function Selection Mode

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How to Use
KF02 Series Instruction Manual
2.3.2 [F-02] OUT2 Setting Selection
Press or button at Function Setting Mode to display [F-02] [oUt2].
Press button
Output Mode Setting
Select output mode：
Press or button to select output
mode of OUT2.
3 output modes included.
Flow Sensor Selected Mode
L/min L/min
Flashing
alternately
NO mode NC mode
Output Type Setting
OUT2 type setting :
Press or button to select OUT2
type. Selected Output Selected Mode
L/min L/min
Flashing
alternately
L/min
L/min
Flashing
alternately
OUT2
L/min
OUT2
L/min
Flashing
alternately
Press button
Hysteresis Mode
※NOTE：The Accumulated Pulse Output Mode can only be set in OUT1, and OUT2 does not have this setting.
Window Comparator Mode Accumulated Output Mode
L/min
L/min
Flashing
alternately
L/min
L/min
Flashing
alternately
L/min
L/min
Flashing
alternately

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How to Use
KF02 Series Instruction Manual
Fixed Hysteresis Setting
Fixed hysteresis setting :
Press or button to adjust fixed
hysteresis value.
※NOTE：Fixed hysteresis setting will not display when Hysteresis Mode and Accumulated Output Mode is set.
Fixed Hysteresis
Mode
Set Value
L/min L/min
Flashing
alternately
L/minL/min
Flashing
alternately
Set Value Setting
OUT2 set value setting :
Press or button to adjust the set
value.
Hysteresis Mode [HYS]：[FL-2]，[FH-2]
Window Comparator Mode ：[FL-2]，[FH-2]
Accumlated Output Mode [ADD]：[AdL2]，[AdH2]
Selected Mode Set Value
L/min L/min
Flashing
alternately
(to be continued)
Press button
Press button
Press button to return to
Function Selection Mode

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How to Use
KF02 Series Instruction Manual
OFF
ON
OFF
ON
Flow
Hysteresis Mode
Hysteresis Mode
FL-1(FL-2)
FH-1(FH-2)
OFF
ON
OFF
ON
FL-1(FL-2)
FH-1(FH-2)
Normal Open Mode
Normal Close Mode
FL-1(FL-2)
FH-1(FH-2)
FL-1(FL-2)
FH-1(FH-2)
Window Comparator Mode
Flow
Window Comparator Mode
Flow
Flow
OFF
ON
0 L
OFF
ON
0 L
Time
AdH1 AdL1
AdH2 AdL2
Time
AdH1 AdL1
AdH2 AdL2
Flow
Accumulated Output Mode
Accumulated Output Mode
Flow
OFF
ON
Time
50ms
【NOTE:】
*1. In case hysteresis is set at less than or equal to 2 digits, switch output may chatter if input detected fluctuates near the set point.
*2. When using window comparator mode, the difference between two set points must be greater than the fixed hysteresis, otherwise
will cause the switch output to malfunction.
Accumulated Pulse Output Mode
Flow Range 500L
5L
1000L 2000L
10L 10L
Pulse Output Rate

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-19-
How to Use
KF02 Series Instruction Manual
2.3.3 [F-03] LCD Display Color Selection
4 LCD Display Color Modes of output value selection.
Press or button at Function Selection Mode to display [F-03] [CLor].
Press button
Output Selection
Press the or button to select
color display for OUT1 or OUT2.
Display color of OUT1 Display color of OUT2
Display Color Mode Selection
Press the or button to select
Display Color Mode.
ON : Green
OFF : Red
ON : Red
OFF : Green
ON : Green
OFF : Green
ON : Red
OFF : Red
Color Display Selected Output
L/min L/min
Flashing
alternately
L/min
L/min
Flashing
alternately
L/min
L/min
Flashing
alternately
Display Color Mode Selected Mode
L/min L/min
Flashing
alternately
L/min
L/min
L/min
L/min
L/min
L/min
L/min
L/min
Flashing
alternately
Flashing
alternately
Flashing
alternately
Flashing
alternately
Press button