Digital Flow Switch
Operation Manual
PF2A7
H
Installation
•Never mount the product in a location that will be used as a foothold.
•The rotation angle of the monitor is 270
o
, in steps of 90
o
. Rotating the display
part with excessive force will damage the end stop.
Piping port
(IN side)
Connector
Body
Monitor part
Piping port
(OUT side)
Lead wire and connector
Item
Body
Description
Monitor part
See below.
Piping port
Connected to the fluid inlet at IN side and to the fluid outlet at OUT side.
Body
The body of the product.
Connector
Connector for electrical connections.
Lead wire and connector
Lead wire to supply power and transmit output signals.
LCD display
Indicator LED (flow rate)
Indicator LED (reference condition)
Indicator LED (output)
button (MODE)
FLOW SWITCH
button (DOWN)
button (UP)
ANR
OUT
Unit display
button (SET)
ft
3
x10
6
ft
3
x10
3
m
3
x10
3
m
3
ft
3
L/min L
CFM
U P
DOWN
MODE
SET
Item
Monitor part
Description
LCD display
Displays the flow value, setting mode, and error indication.
Indicator LED (reference condition)
Indicates the reference condition selected. LED is ON (Red) when standard
condition is selected.
Indicator LED (output)
Indicates the output status of OUT1. LED is ON (Red) when OUT1 is ON.
The LED flashes when an over current error occurs.
button (UP)
Selects the mode or increases the ON/OFF Set value.
button (SET)
Press this button to change to another mode and to set a value.
button (MODE)
Moves on to the function selection mode.
button (DOWN)
Selects the mode or decreases the ON/OFF Set value.
Connector pin numbers
(On the product)
1
3
2
4
1
DC(+)
2
Analogue output
3
DC(-)
4
OUT1
Thank you for purchasing an SMC PF2A7
H Series Digital Flow Switch.
Please read this manual carefully before operating the product and make sure you
understand its capabilities and limitations.
Please keep this manual handy for future reference.
To obtain more detailed information about operating this product, please
refer to the SMC website (URL http://www.smcworld.com) or contact SMC
directly.
Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or
equipment damage.
These instructions indicate the level of potential hazard with the labels of
"Caution", "Warning" or "Danger". They are all important notes for safety and must
be followed in addition to International standards (ISO/IEC) and other safety
regulations.
CAUTION indicates a hazard with a low level of risk
which, if not avoided, could result in minor or
moderate injury.
Operator
This operation manual is intended for those who have knowledge of machinery
using pneumatic equipment, and have sufficient knowledge of assembly,
operation and maintenance of such equipment. Only those persons are
allowed to perform assembly, operation and maintenance.
Read and understand this operation manual carefully before assembling,
operating or providing maintenance to the product.
Caution:
Warning:
Danger:
WARNING indicates a hazard with a medium level of
risk which, if not avoided, could result in death or
serious injury.
DANGER indicates a hazard with a high level of risk
which, if not avoided, will result in death or serious
injury.
Safety Instructions
Do not disassemble, modify (including changing the printed circuit board) or repair.
An injury or failure can result.
Do not operate in an atmosphere containing flammable, explosive or corrosive gas.
Fire or an explosion can result.
This product is not designed to be explosion proof.
Do not use the product for flammable fluid.
A fire or explosion can result.
Do not use the product in a place where static electricity is a problem.
Otherwise it can cause failure or malfunction of the system.
If using the product in an interlocking circuit:
•Provide a double interlocking system, for example a mechanical system
•Check the product regularly for proper operation
Otherwise malfunction can result, causing an accident.
The following instructions must be followed during maintenance:
•Turn off the power supply
•Stop the air supply, exhaust the residual pressure and verify that the air is released before performing
maintenance work
Otherwise an injury can result.
After maintenance is complete, perform appropriate functional inspections and leak tests.
Stop operation if the equipment does not function properly or there is a leakage of fluid.
When leakage occurs from parts other than the piping, the product might be faulty.
Disconnect the power supply and stop the fluid supply.
Do not apply fluid under leaking conditions.
Safety cannot be assured in the case of unexpected malfunction.
Do not touch the terminals and connectors while the power is on.
Otherwise electric shock, malfunction or damage to the product can result.
Do not operate the product outside of the specifications.
Do not use for flammable or harmful fluids.
Fire, malfunction, or damage to the product can result.
Verify the specifications before use.
Warning
Caution
Maintenance
How to reset the product after a power cut or forcible de-energizing
The setting of the product will be retained as it was before a power cut or
de-energizing.
The output condition is also basically recovered to that before a power cut or
de-energizing, but may change depending on the operating environment.
Therefore, check the safety of the whole installation before operating the product.
Summary of Product parts
Mounting and Installation
Indicator LED (flow rate)
Flashes with the cycle proportional to the flow rate.
Unit display
Display the selected unit.
IN side
OUT side
FLOW SW
ITCH
End stop
position
End stop
position
90°
180°
0°
270°
Connecting the piping
•Ensure that the metal piping attachments are tightened to the required torque
(refer to the table below).
•If the tightening torque is exceeded, the product can be broken. If the
tightening torque is insufficient, the fittings may become loose.
•When connecting piping to the product, a spanner should be used on the
metal piping attachment only. Using a spanner on other parts may damage
the product.
•Avoid any sealing tape from entering inside the piping.
•Ensure that there is no leakage from loose piping.
←
Dis
pla
y in
sta
nta
ne
ou
s fl
ow
D
isp
lay
ac
cu
m
ula
ted
flo
w
→
+
3 sec. or longer
Input of the Set point
Instantaneous output mode
Accumulated output mode
Press
and
Press
and
6 sec. or longer
∗
1: Operate only the product with unit selction function (Model indication: without M).
∗
2: A set of value is not input, when accumulate pulse output mode.
∗
3: Depend on the setting of switch operation in initialize mode.
∗
4: Displayed in turn.
∗
5: Setting is available when Set point 1 < Set point 2.
∗
2
Accumulated value is reset
Display
instantaneous flow
The display digit of the
accumulate flow rate is set.
Unit flashes.
L
→
m
3
→
m
3
×10
3
→
L ...
Set value
or
∗
3
∗
4
Set value (lower digits)
Input of the Set point 2
or
∗
3
∗
4
Set value
or
∗
3
∗
4
Set value
Set value (middle digits)
Input of hysteresis
∗
5
Set value
or
∗
3
∗
4
Set value (upper digits)
3 sec. or longer
Display
accumulated flow
The display digit of the accumulate flow
rate is changed. L
→
m
3
→
m
3
×10
3
→
L ...
Function selection mode
/
Output mode
Instantaneous
output mode
Accumulated
output mode
Accumulated pulse
output mode
/
/
/
/
Initialize mode
Items below can be set one by one.
1.Display mode 2.Unit selection function
∗
1
3.Output mode 4.Input of Set point
5.Switch operation 6.Key-lock function
Display mode
Display
instantaneous flow
Display
accumulated flow
Unit selection function
∗
1
L/min, L
CFM, ft
3
Reset to the default setting
Key-lock function
Unlock
Lock
Switch operation
Reverse output
Non-Reverse output
Reference condition
Standard condition
Normal condition
Accumulated value hold
Not held
Held
ANR
OUT
ft
3
x10
6
ft
3
x10
3
m
3
x10
3
m
3
m
3
ft
3
L/min L
CFM
ANR
OUT
ft
3
x10
6
ft
3
x10
3
m
3
x10
3
m
3
m
3
ft
3
L/min L
CFM
Measurement mode
(Accumulated flow)
∗
: Accumulation starts as the power supply starts.
/
/
/
/
/
∗
: Start the setting here to supply power under the default settings.
Measurement mode
(Instantaneous flow)
m
3
×10
3
m
3
L
Set value
∗
4
∗
4
Set value
or
∗
3
Input of the Set point 1
List of outputs
Find the diagram of the output required in the table below. Perform settings
following the Set value column on the right.
In
s
ta
n
ta
n
e
o
u
s
f
lo
w
Switch output diagram
Output mode
Switch operation
Set value
Instantaneous
output mode
Non-Reverse
output
Set point 2 Set point 1
Hysteresis mode
∗
2
Set point 1 Set point 2
Window comparator mode
Set point 1
Set point 2
Window comparator mode
Reverse output
OFF
ON
Hysteresis
P_2 P_1
Instantaneous flow
OFF
ON
Hysteresis
∗
1
Hysteresis
∗
1
P_1
P_2 Instantaneous flow
OFF
ON
Hysteresis
n_2 n_1
Instantaneous flow
OFF
ON
Hysteresis
∗
1
Hysteresis
∗
1
n_1
n_2 Instantaneous flow
Set point 2 Set point 1
Hysteresis mode
∗
2
Wiring
•Connections should only be made with the power supply turned off.
•Use separate routes for the product wiring and any power or high voltage
wiring. Otherwise, malfunction may result due to noise.
•Ensure that the FG terminal is connected to ground when using a commercially
available switch-mode power supply. When a switch-mode power supply is
connected to the product, switching noise will be superimposed and the
product specification can no longer be met. This can be prevented by inserting
a noise filter, such as a line noise filter and ferrite core, between the switch-
mode power supply and the product, or by using a series power supply instead
of a switch-mode power supply.
Connecting the wiring
•Align the lead wire connector with the connector key groove, and insert
vertically.
•Connection is complete when the knurled part is fully tightened. Check that
the connection is not loose.
Connector Pin numbers
When the lead wire with connector designated for the PF2A7 is used, the wire
colours will apply as shown in the diagram.
1
4
2
3
Power is supplied
Outline of setting
Pin number
Content
2
Analogue output
3
DC(-)
4
OUT1
The output will not operate for 3 seconds after supplying power.
The identification code of the product is displayed.
Measurement mode
The mode in which the flow is detected and displayed, and the switch output
is operating.
This is the basic operating mode; and other modes should be selected for
setting changes and other function settings.
Accumulated flow can be displayed up to 9999999999 L (999999999.9 ft
3
).
The LCD display displays up to 5 digits at one time. The display is divided
into three parts (upper digits, middle digits and lower digits).
Function selection mode
Other functions
button
1
DC(+)
Colour
White
Blue
Black
Brown
Setting flow chart
A
c
c
u
m
u
la
te
d
f
lo
w
Accumulated
output mode
Non-Reverse
output
Reverse output
OFF
ON
Time
Time
Accumlated flow
P_3
OFF
ON
Time
Time
Accumlated flow
n_3
A
c
c
u
m
u
la
te
d
p
u
ls
e
Accumulated
pulse output
mode
No Set value input
No Set value input
Reverse output
OFF
ON
Time
50 ms
OFF
ON
Time
50 ms
Error indication
∗
: If the error cannot be reset after the above measures are taken, then please contact SMC.
Function selection mode
Default settings
The default settings are as follows.
If this condition is acceptable, then keep these settings.
In measurement mode, press the
button , to display [F_0].
This [F_ ] indicates the mode for changing each functional setting.
Specifications / Outline with Dimensions
Refer to the product catalogue or SMC website (URL http://www.smcworld.com) for
more information about the product specifications and outline dimensions.
Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
© 2011 SMC Corporation All Rights Reserved
Akihabara UDX 15F, 4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021, JAPAN
Phone: +81 3-5207-8249 Fax: +81 3-5298-5362
URL http://www.smcworld.com
Troubleshooting
Non-Reverse
output
Refer to the SMC website (URL http://www.smcworld.com) for more information
about troubleshooting.
∗
1: Hysteresis can be set between "0" and "3% of maximum rated flow". If the difference between Set point 1 and
Set point 2 is less than "6% of maximum rated flow", the maximum Set value of hysteresis is (Set point 1 -
Set point 2) divided by 2.
∗
2: When Set point 1 = Set point 2, chattering may occur.
Display unit
Maximum flow
display value
L display
[ U_1]
9999999999 L
ft display
∗
[ U_2]
999999999.9 ft
3
Display digit
9999 m
3
×10
3
(9999
L)
99999 m
3
(99999
L)
999 ft
3
×10
6
(999
.
ft
3
)
99999 ft
3
×10
3
(99999
.
ft
3
)
Upper digits
Middle digits
99999 L
9999.9 ft
3
Lower digits
∗
: Operate only the product with unit selection function.
[F_0]
Selection of display mode
Item
Unit selection function
∗
1
Selection of output mode
Input of Set point 1
[F_1]
Selection of display mode
[F_3]
Selection of output mode
Input of Set point 1
∗
1: Operate only the product with unit selection function.
∗
2: Setting is available when Set point 1
Set point 2.
Not displayed when Set point 1
Set point 2.
[ d_1] Display instantaneous flow
Default Setting
[ U_1] L/min
[oU1_0] Instantaneous output mode
50% of max. rated flow
[ d_1] Display instantaneous flow
[oU1_0] Instantaneous output mode
50% of max. rated flow
Input of Set point 2
Input of hysteresis
∗
2
50% of max. rated flow
[ 0]
Input of Set point 2
Input of hysteresis
∗
2
Selection of switch operation
Key-lock function
50% of max. rated flow
[ 0]
[oU1_n] Reverse output
[ UnL] Unlocked
[F_2]
Unit selection function
∗
1
[ U_1] L/min
[F_4]
Selection of switch operation
[F_6]
Input of Set point 1
Input of Set point 2
[oU1_n] Reverse output
50% of max. rated flow
50% of max. rated flow
Input of hysteresis
∗
2
[ 0]
[F_5]
Key-lock function
[ UnL] Unlocked
[F_7]
Selection of reference condition
[ Anr] Standard condition
[F_8]
Accumulated value hold
[ oFF] Not held
To set each of these functions, refer to the SMC website
(URL http://www.smcworld.com) for more information about other functions in
detail.
Other functions
Reset of the accumulated flow
Reset to the default setting
Flow has exceeded the upper
limit of the display flow range.
Reduce the flow.
Display
Type
Troubleshooting
The switch output load
current is more than 80 mA
(OUT1).
Turn the power off and remove
the cause of the over current.
Then turn the power on again.
The set data has been
changed unexpectedly.
Exceeds the range of the
2nd. turn of flow indication.
To reset, press the
button for
6 seconds or longer while the
button is pressed. Then set all
data again.
Stop using and please contact
SMC.
The internal circuit could be
damaged.
To reset the accumulated flow
value, press the
button for
6 seconds or longer while the
button is pressed.
Excessive
instantaneous
flow
Error Name
Over current
error
System error
Excessive
accumulated
flow
Upper digits
Middle digits
Lower digits
Upper digits
Middle digits
Lower digits
(When [ U_1] is selected)
(When [ U_2] is selected)
Accumulated flow displayed
(flashing)
ANR
OUT
ft
3
x10
6
ft
3
x10
3
m
3
x10
3
m
3
ft
3
L/min L
CFM
ANR
OUT
ft
3
x10
6
ft
3
x10
3
m
3
x10
3
m
3
ft
3
L/min L
CFM
Piping
•Use the product within the specified operating pressure range and temperature
range.
•Proof pressure is 2.25 MPa.
•Connect the piping to the fittings.
•Mount the product so that the fluid direction is the same as the arrow indicated
on the product.
•Never mount the product upside down.
•The piping on the IN side must have a straight section of piping whose length
is 8 times the piping diameter or more.
•Avoid sudden changes in the piping size on the IN side of the product.
Metal piping attachment
Knurled part
Flow direction
OUT side
IN side
Restrictor
D x 8 times
Port size D
FLOW SWITCH
Model
Width across flats
of attachment
PF2A706H
PF2A712H
65 mm
PF2A703H
55 mm
75 mm
Rc(NPT)1
1
/
2
Rc(NPT)2
Rc(NPT)1
Nominal
thread size
Tightening torque
48 to 50 Nm
36 to 38 Nm
