KITA KFP02 Series User manual

INSTRUCTION MANUAL
KFP02 Series
DIGITAL FLOW AND PRESSURE 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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KFP02 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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KFP02 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
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
Warning
Caution
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 KFP02 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
accordance with E-Waste regulations of the
country/region, NOT disposed of with regular
garbage.
➀

KFP02 Series Instruction Manual
@2021 KITA Sensor Tech. Co., LTD. URL http://www.kita.com.tw
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■ 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
KFP02 Series
Pressure Sensor
Flow Sensor
Air Source
Filter
Regulator
Micro Mist Separator
(Oil Mist Filiter)
Air Dryer
Inlet
Outlet
Throttle Valve
※NOTE：
Please install a throttle valve on the outlet side of the sensor to prevent errors caused by unstable flow.
Warning

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Contents
KFP02 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 ................................................................................. 44
4. Error Code Instruction ..................................................................................... 46
5. Specifications..................................................................................................... 47
6. Pressure Loss Characteristics ...................................................................... 48
7. Thermal Mass Principles of Flow Sensor ................................................... 48
8. Ordering Information ....................................................................................... 49
9. Dimensions ........................................................................................................ 50
10. Internal Structure ........................................................................................... 52

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Installation
KFP02 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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KFP02 Series Instruction Manual
Installation
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
KFP02 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
KFP02 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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KFP02 Series Instruction Manual
Installation Instructions
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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KFP02 Series Instruction Manual
How to Use
2 How to Use
2.1 Names and Functions of Individual Parts
Output 1 Indicator
3 Color LCD Display Flow Symbol
Flow Display
Button
Button
Analog Signal Indicator
Output 2 Indicator
Output 1 Indicator
Output 2 Indicator
Analog Signal Indicator
Pressure Symbol
Pressure Display
Setting Button
Pressure Unit
Display Section
Flow Unit
Display Section
Ag OUT1OUT2 Ag OUT1OUT2
kgf/cm2bar psi kPa Pulse ft3/min mL3/min
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)
Piping Port
(Outlet side)
LCD Display
Body
Connector

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KFP02 Series Instruction Manual
How to Use
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
Select Output 1 corresponding
to flow sensor or pressure sensor.
Set the flow rate or pressure
value to switch ON/OFF.
Select Output 2 corresponding
to flow sensor or pressure sensor.
Set the flow rate or pressure
value to switch ON/OFF.
Select back light color and
display mode.
Select the response time for
analog output.
Pressure sensor: 2.5ms ~ 1500ms
Flow sensor: 50ms ~ 1500ms
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
[oUt1] OUT1 sensor
correspondence
[FLo ] OUT1 output mode
CLor
[diSP] LCD Display
corresponding to output
oUt1
[ CoL] LCD Display color
selection SoG
rESP
[FLo ] Response time selection 800 (ms)
[rESP] Flow/Pressure sensor
selection
Function
Code
oUt1
oUt2
[oUt2] OUT2 sensor
correspondence FLo
[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
FLo
HYS
FLo
UPdA
[UPdA] Display refresh time of
flow sensor selection 500
(ms)
[UPdA] Flow/Pressure sensor
selection
FLo

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KFP02 Series Instruction Manual
How to Use
● Measurement Mode
Item Explanation
Pressure display
Flow display
Accumulated flow rate display
Pressure zero setting
Instantaneous Flow rate zero setting
Accumulated flow rate zero clear
Peak value display
Bottom value display
Key lock/unlock mode
Display pressure value.
Display instantaneous flow rate.
Display accumulated flow rate.
The displayed pressure value can be adjusted to "0".
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]
[rEFE] Flow reference standard selection
[ AnG] Analog output selection
[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
Select the flow value is shown under
standard (ANR) or normal condition (NOR).
Select the analog corresponding to
pressure or flow sensor.
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.
rEFE
Anr
AnG
Flo
EEPr
[rEFE] Flow reference standard selection
[ AnG] Analog 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
[F-07]
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
[F-06]
[Unit] Unit selection
Select the UNIT of pressure / flow sensor.
Unit
[PrES] Pressure unit selection Unit
[FLo ] Flow unit selection LPn

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KFP02 Series Instruction Manual
How to Use
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
Ag
kPa L /min
Ag
kPa L /min
Ag
kPa L /min
Measurement Mode
Function Selection Mode
Press button for
more than 3 sec.
Enter in each function setting
Ag
kPa L /min
Press button

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KFP02 Series Instruction Manual
How to Use
2.3.1 [F-01] OUT1 Setting Selection
Setting corresponding sensor and operating mode of OUT1.
● 1. Flow sensor setting
Press or button at Function Setting Mode to display [F-01] [oUt1].
Ag
kPa L /min
Sensor Selection
Press or button to select
flow sensor of OUT1.
Flow sensor
Ag
kPa L /min
Selected
Output
Sensor
Pressure sensor
Press button
(to be continued)
Ag
kPa L /min
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.
Ag
kPa L /min
Selected
Mode
Selected
Sensor
Window Comparator Mode Accumulated Output Mode
Ag
kPa L /min
Ag
kPa L /min
Ag
kPa L /min
Accumulated Pulse
Output Mode
Ag
kPa Pulse L /min
Press button
Press button

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KFP02 Series Instruction Manual
How to Use
Fixed Hysteresis
Mode
NO mode NC mode
Ag
kPa L /min
Selected
Output
Selected
Mode
Output Type Setting
OUT1 type setting :
Press or button to select OUT1
type.
Ag
kPa L /min
Ag
kPa L /min
※NOTE：Type setting will not display when Accumulated Pulse Output Mode is set.
Ag
kPa L /min
Set ValueSelected
Mode
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.
Ag
kPa L /min
Set Value
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.
Ag
kPa L /min
Press button
Press button
Press button to return to
Function Selection Mode

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KFP02 Series Instruction Manual
How to Use
● 2. Pressure sensor setting
Press or button at Function Selection Mode to display [F-01] [oUt1].
Output Mode Setting
Select output mode：
Press or button to select output
mode of OUT1.
Hysteresis Mode
Ag
kPa L /min
Window Comparator Mode One Point Set Mode
Ag
kPa L /min
Ag
kPa L /min
Ag
kPa L /min
Press button
Ag
kPa L /min
Sensor Selection
Press or button to select
pressure sensor of OUT1.
Flow sensor
Ag
kPa L /min
Pressure sensor
Ag
kPa L /min
Press button
(to be continued)
Press button
Selected
Output
Sensor
Selected
Mode
Sensor

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KFP02 Series Instruction Manual
How to Use
NO Mode NC Mode
Ag
kPa L /min
Output Type Setting
OUT1 type setting :
Press or button to select OUT1
type.
Ag
kPa L /min
Set Value Setting
Out1 set value setting :
Press or button to adjust the set
value.
Hysteresis Mode [HYS]：[L-1]，[H-1]
Window Comparator Mode ：[L-1]，[H-1]
One Point Set Mode [oPS]：[P-1]
Ag
kPa L /min
Fixed Hysteresis Setting
Fixed hysteresis setting :
Press or button to adjust fixed
hysteresis value.
NOTE：Fixed hysteresis setting will not display when Hysteresis Mode is set.
Ag
kPa L /min
Ag
kPa L /min
Ag
kPa L /min
Press button
Press button
Fixed Hysteresis
Mode
Set Value
Selected
Mode
Output
Selected
Set Value
Mode
Press button to return to
Function Selection Mode

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KFP02 Series Instruction Manual
How to Use
OFF
ON
OFF
ON
Flow / Pressure
Hysteresis Mode
Hysteresis Mode
FL-1(FL-2)
L-1(L-2)
FH-1(FH-2)
H-1(H-2)
OFF
ON
OFF
ON
FL-1(FL-2)
L-1(L-2)
FH-1(FH-2)
H-1(H-2)
OFF
ON
0 L
OFF
ON
0 L
Time
AdH1 AdL1
AdH2 AdL2
OFF
ON
Time
50ms
Flow Range 500L 1000L 2000L
5L 10L 10LPulse Output Rate
Normal Open Mode
Normal Close Mode
FL-1(FL-2)
L-1(L-2)
FH-1(FH-2)
H-1(H-2)
OFF
ON
OFF
ON
P-1(P-2)
FL-1(FL-2)
L-1(L-2)
FH-1(FH-2)
H-1(H-2)
P-1(P-2)
Time
AdH1 AdL1
AdH2 AdL2
Pressure
Flow
【NOTE:】
*1. In case hysteresis is set at less than or equal to 2 digits, switch output may chatter if input pressure 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.
Window Comparator Mode
One Point Set Mode
Accumulated Output Mode
Accumulated Pulse Output Mode
Flow / Pressure
Accumulated Output Mode
Flow
One Point Set Mode
Pressure
Window Comparator Mode
Flow / Pressure
Flow / Pressure

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KFP02 Series Instruction Manual
How to Use
2.3.2 [F-02] OUT2 Setting Selection
Setting corresponding sensor and operating mode of OUT2.
1. Press or button at function setting mode to start "OUT 2
Setting" [F-02] [oUt2].
2. Check the [F-01]for the same follow setting.
NOTE：The OUT2 Setting dose not have Accumulated Pulse Output Mode.