026a/eng
For future reference, please keep this manual in a safe place
This manual should be read in conjunction with the current product catalogue.
Safety Instructions
These safety instructions are intended to prevent a hazardous situation and/or equipment damage.These instructions indicate the level
of potential hazard by label of “Caution”, “Warning” or “Danger”.
To ensure safety, be sure to observe ISO4414 (Note1), JIS B 8370 (Note2)
and other safety practices.
Note 1: ISO 4414: Pneumatic fluid power – Recommendations for the
application of equipment to transmission and control systems.
Note 2: JIS B 8370: Pneumatic system axiom.
CAUTION : Operator error could result in injury or
equipment damage.
WARNING: Operator error could result in serious
injury or loss of life.
DANGER : In extreme conditions, there is a
possible result of serious injury or loss of life.
WARNING
1. The compatibility of pneumatic equipment is the responsibility of the person who designs the pneumatic system
or decides its specifications.
Since the products specified here are used in various operating
conditions, their compatibility for the specific pneumatic system
must be based on specifications or after analysis and/or tests to
meet your specific requirements.
2. Only trained personnel should operate pneumatically
operated machinery and equipment.
Compressed air can be dangerous if an operator is unfamiliar
with it. Assembly, handling or repair of pneumatic systems should
be performed by trained and experienced operators.
3. Do not service machinery/equipment or attempt to
remove component until safety is confirmed.
1) Inspection and maintenance of machinery/equipment should
only be performed after confirmation of safe locked-out
control positions.
2) When equipment is to be removed, confirm the safety process
as mentioned above. Switch off air and electrical supplies and
exhaust all residual compressed air in the system.
3) Before machinery/equipment is re-started, ensure all safety
measures to prevent sudden movement of cylinders etc.
(Bleed air into the system gradually to create back-pressure,
i.e. incorporate a soft-start valve).
4. Contact SMC if the product is to be used in any of the
following conditions:
1) Conditions and environments beyond the given specifications, or if product is used outdoors.
2) Installations in conjunction with atomic energy, railway, air
navigation, vehicles, medical equipment, food and beverage,
recreation equipment, emergency stop circuits, press
applications, or safety equipment.
3) An application which has the possibility of having negative
effects on people, property, or animals, requiring special
safety analysis.
CAUTION
Ensure that the air supply system is filtered to 5 micron.
PFW (WATER) standard specifications PFW704/PFW720/PFW740 (self contained type). (Fig 1)
Operation indicating lamp
Response time
Hysteresis
Power voltage
Current consumption
Withstand voltage
Insulation resistance
Noise resistance
Vibration resistance
Shock resistance
Weight
Port size
PFW720-k-k
PFW740-k-k
Water
Karman vortex
0.6~4 L/min
2~16 L/min
5~40 L/min
0.05 L/min
0.1 L/min
0.5 L/min
L/min, gal (US)/min
L, gal (US)
0~1 MPa
1.5 MPa
0~999999L
0~50°C (w/o condensation)
±5% F.S. or less
±3% F.S. or less
±5% F.S. or less (0~50°C)
27: NPN open collector, 30V, 80mA, 2 outputs
67: PNP open collector, 80mA, 2 outputs
OUT1: Green, OUT2: Red, as turning on the power
1 sec.
Hysteresis mode: Variable (from 0)
Wind comparator mode: Fixed, 3 digits
DC12~24V (Ripple ±10% or less)
70mA or less
AC1000V for 1 min. between all the external terminals and case
2 MΩ (DC500V) between all the external terminals and case
1000Vp-p, Pulse duration: 1 µs, Rise: 1 ns
10~500Hz, 2 hours each in X, Y, Z direction at smaller
vibration of amplitude: 1.5mm and acceleration: 98m/s2
490m/s2, times each in X, Y, Z direction
460g (w/o lead wires)
520g (w/o lead wires)
700g (w/o lead wires)
Rc3/8
Rc3/8, 1/2
Rc/1/2, 3/4
NPT3/8
NPT3/8, 1/2
NPT1/2, 3/4
G3/8
G3/8, 1/2
G1/2, 3/4
Model
Fluid
Detection type
Measuring flow range
Resolution
Display unit
Instantaneous flow
Integrated flow
Integrated flow range
Operating temperature range
Linearity (Note 1)
Repeatability (Note 1)
Temperature characteristic (Note 1)
Output (Note 2)
Operation indicating lamp
Response time
Hysteresis
Power voltage
Current consumption
Weight
PFW310-k
PFW300-k
PFW301-k
PFW320-k
PFW321-k
Water
Karman vortex
0.6~4 L/min
2~16 L/min
5~40 L/min
0.05 L/min
0.1 L/min
0.5 L/min
L/min, gal (US)/min
L, gal (US)
0~999999L
0~50°C (w/o condensation)
±5% F.S. or less
±3% F.S. or less
±5% F.S. or less (0~50°C)
NPN open
PNP open
NPN open
PNP open
NPN open
PNP open
collector
collector
collector
collector
collector
collector
30V
30V
30V
80mA
80mA
80mA
80mA
80mA
80mA
2 outputs
2 outputs
2 outputs
2 outputs
2 outputs
2 outputs
OUT1: Green, OUT2: Red, as turning on the power
1 sec.
Hysteresis mode: Variable (from 0)
Wind comparator mode: Fixed, 3 digits
DC12~24V (Ripple ±10% or less)
50mA or less
45g
Installation.
WARNING
Ensure all air and power supplies are ISOLATED before commencing
installation.
Do not install these switches in explosive atmospheres.
If these switches are exposed to water or oil droplets, ensure that the
switches are protected.
If it is intended to energise a switch for an extended period, please
consult SMC.
Load must not exceed the maximum stated load.
If the applied voltage is lower than the specified voltage, the load may
NOT operate.
Check that the formula: Source voltage-switch internal voltage
>load operating voltage.
Input data will not be erased when POWER is switched OFF. (EEPROM
storage)
DO NOT ATTEMPT TO DISASSEMBLE OR MODIFY A SWITCH.
Do not operate a switch outside of the specified flow and pressure
range.
When operating a water switch, control the valve closing speed
utilising a water hammer control valve.
Ensure when operating a switch, the measuring section is completely
filled with liquid.
Do not exceed specified flow range speeds.
Do not subject a switch to shock loads exceeding 10G.
The switch output remains in the OFF condition for 1 second after
power is applied.
Note: Lead wire colours have been changed as shown in
the table below due to JIS Standard amendment.
Power supply wire
GND wire
OUT 1, Analog output wire
OUT 2
Old colour
Red
Black
White
Yellow
New colour
Brown
Blue
Black
White
Wire colour and terminal number (Fig 4)
To prevent mis-wiring, ensure wire colours and terminal numbers conform to the wiring specification. Do not apply repeated bending or tensile stress to the wiring. Check wire insulation is not damaged. Keep
control wires and power wires separated to prevent noise transmission.
Surge Voltage
To prevent switch damage, do not subject the switch to any form of
surge voltage i.e. induction motor, induction furnace. Install surge
voltage suppression.
WARNING.
When installing a switch follow the listed torque specifications shown
in the table below.
Thread
1/8
1/4
3/8
1/2
Tightening torque Nm
7 to 9
12 to 14
22 to 24
28 to 30
1 N•m=10.2 kgf/cm
When handling a switch do not apply excessive force to the unit as
damage will cause malfunction.
When installing a switch ENSURE 80MM OF PIPE LENGTH IS LEFT
EITHER SIDE OF THE SWITCH BODY.
Check ambient and fluid temperatures are within the specifications
0~50°C. If the temperature drops below 5°C FREEZING MAY OCCUR.
Installation of an air dryer is recommended.
Calibration procedure (Fig 5)
Model
Measuring fluid
Detection
Measuring flow range
Operating pressure range
Proof pressure
Operating temperature range
Power voltage
Current consumption
Weight
Port size
PFW504-k
PFW520-k
Water
Karman vortex
2~16 L/min
0~1 MPa
1.5 MPa
0~50°C (w/o condensation)
DC12~24V (Ripple ±10% or less)
20mA or less
470g (w/o lead wires)
Rc3/8, 1/2
NPT3/8, 1/2
G3/8, 1/2
0.6~4 L/min
410g (w/o lead wires)
Rc3/8
NPT3/8
G3/8
PFW540-k
5~40 L/min
Lock out
mode
Manual
calibration
650g (w/o lead wires)
Rc/1/2, 3/4
NPT1/2, 3/4
G1/2, 3/4
Operation of switch is not
compromised if a button is
pushed by mistake.
Calibrate set point for
switch output.
Initial set up
Calibrate display mode
(instant flow, integrated
flow), unit mode and output
mode (standard, reversed).
Remote Type
Self-contained type
Procedure
Auto preset
Calibrate set point
automatically.
Normal
operation
Manual
calibration
The data set by auto preset
function can be fine tuned.
Flow displayed and switch
operation occurs.
Fig 2
Fig 1
Construction (Fig 3)
Fig 5
For water
Switch controls description (Fig 6)
Parts list
No.
1
2
3
4
Description
Attachment
Packing
Body
Sensor
Material
SUS
NBR
PPS
PPS
Fig 3
"-67"
PNP open collector
"-27"
NPN open collector
Brown DC(+)
30V, 80mA
Residual
voltage:
1V or less
LED
(Green)
LED
(Red)
Max.80mA
Black OUT1
Load
Max.80mA
White OUT2
Black OUT1
Max.80mA
Press the UP and DOWN buttons simultaneously to reset the switch. Display of
integrating flow rate is "0".
Displays instant/integrating flow and set
point. "
" blinks when calculating
the integrating flow rating.
OUT1 (Green)
UP key
Light turns on when OUT1 is ON. Light
blinks on and off when over current
error occurs.
In creases on/off set point.
OUT2 (Red)
Load
LED (Green)
White OUT2 Max.80mA
Load
Load
Blue DC(-)
LED
Fig 4
SET key
Brown DC(+)
80mA
12 to 24 VDC
RESET
LED (Red)
Blue DC(-)
12 to 24 VDC
Light turns on when OUT2 is ON. Light
blinks on and off when over current
error occurs.
Changes the set point and mode of
operation.
DOWN key
Decreases on/off set point.
CAUTION
Calibration data is stored in an EEPROM rated to 20 years. Without
POWER.
CAUTION
Wiring (Fig 4)
Remote type PFW504/PFW520/PFW540 sensor specifications (Fig 2)
PFW704-k-k
Note 1:Output function (OUT1 and OUT2) is available only for instantaneous flow display, but not for integrated flow display.
Note 2:Window comparator mode: The P1 and P2 setpoints have to set at least 7 digits apart. This is caused by hysteresis (3 digits) for P1 and
P2 and the need for the setpoints to be at least 1 digit different (after including the hysteresis). 1 digit means Min setting unit (refer to
the above).
CAUTION
PFW311-k
Note 1:Total accuracy for the combination with PFW504/PFW520/PFW540.
Note 2:Output function (OUT1 and OUT2) is available only for instantaneous flow display, but not for integrated flow display.
Note 3:Window comparator mode: The P1 and P2 setpoints have to set at least 7 digits apart. This is caused by hysteresis (3 digits) for P1 and
P2 and the need for the setpoints to be at least 1 digit different (after including the hysteresis). 1 digit means Min setting unit (refer to
the above).
Circuit
Model
Measuring fluid
Detection
Measuring flow range
Resolution
Display unit
Instantaneous flow
Integrated flow
Operating pressure range
Proof pressure
Integrated flow range
Operating temperature range
Linearity
Repeatability
Temperature characteristic
Output (Note 1)
Remote type PFW31/PFW30/PFW32 display module specifications (Fig 2)
Circuit
Installation and Maintenance Manual
PFW Series Digital Flow Switch (Water)
Fig 6
Initial set-up (Fig 7)
Auto pre-set (Fig 9)
Error codes (Fig 11)
Display
The procedure is identical for both self-contained or remote units.
1 Calibration value input mode
1. Initial setup mode
2. Selection of display mode
3. Selection of display unit
E
E
E
E
SET
Press the "SET"
button.
Press the "SET" button for at least
1 second until the display "
"
changes to "
" or "
".
E
SET
Select display unit by pressing the
button "G" and "H".
4. Selection of "OUT1 output mode"
5. Selection of "OUT2 output mode"
Number of unit
(Refer to Table 1 .)
E
E
E
SET
Press the "SET"
button.
Select standard or reversed output mode
by pressing the "G" button.
: Standard output
: reversed output
(Refer to Table 2 .)
Select standard or reversed output
mode by pressing the "G" button.
: Standard output
: Reversed output
E
E
Press the "SET"
button.
Select instant flow or integrated
flow display by pressing the button
"G".
: Instant flow indication
: Integrated flow indication
3. Preparation of auto preset
2. Auto preset mode
E
Press the "SET"
button.
Press the "SET" button until
"
" is displayed.
Select "
" by pressing the
"G" button.
4. OUT1 auto preset
5. Preparation of auto preset
E
SET
By pressing the "SET"
button, the calibration
is completed.
E
SET
SET
Press the "SET"
button.
Press the "SET" button and
confirm that " " alternates
with set point value. This will set
the best values automatically.
E
(
(
OUT1 is prepared for setting by flowing
the fluid.
In case that OUT1 is not required to
calibrate, press the "G" and "H"
buttons simultaneously.
6. OUT2 auto preset
E
E
OUT2 is prepared for setting by
flowing the fluid.
In case that OUT2 is not
required to calibrate, press the
"G" and "H" buttons
simultaneously.
)
Press the "SET" button and confirm that
"
" alternates with set point value.
This will set the best values automatically.
ON (C.C1)
By pressing
the "SET"
button, the
calibration
is completed.
Hysterisis
3 (digit)
Instant flow
l /min.
GPM
Integrated flow
l
gal (us)
YES ON
GPM=gal (US)/min.
OFF
• Hysteresis mode
Flow direction R
ON
NO OFF
Output
mode
Out1
*OUT2 is same as OUT1
Flow direction R
YES ON
OFF
• Hysteresis mode
Start of integration
Lock out
E
H (Fixed hysteresis)
=3digit
ON
NO OFF
Lock out mode------------Prevent unauthorised operation.
Press the "H" and the "SET"
buttons simultaneously. " "
blinks and the integration starts.
Flow direction R
Flow direction R
• Window comparator mode
E
E
Integration can be up to "
",
but only the last three figures are
displayed normally. Press the "H"
button to confirm the first three
figures.
Press the "SET" button for more
than three seconds until the display changes to "
",
"
", "
" and then " ".
Stop of integration
Lock out release
Select "
" by pressing the
"G" button.
E
Fig 7
Instant flow can be confirmed
by pressing the "G" button
while integrating.
Manual calibration (Fig 8)
1 Calibration value input mode (manual)
3. Input set point value for OUT1 (1)
2. Manual mode
E
E
E
SET
E
Press the "SET"
button.
Press the "SET" button referring
to Table 2 .
"
" is for manual setting, so
press the "SET" button one more
time.
" " or "
" alternates with set
point value.
G button: Increase set point value.
H button: Decrease set point value.
4. Input set point value for OUT1 (2)
5. Input set point value for OUT2 (1)
6. Input set point value for OUT2 (2)
E
SET
E
E
Press the "SET"
button.
"
" or "
" alternates
with set point value.
G button: Increase set point
value.
H button: Decrease set point
value.
SET
E
Press the "SET"
button.
"
" or "
" alternates
with set point value.
G button: Increase set point
value.
H button: Decrease set point
value.
"
" or "
" alternates
with set point value.
G button: Increase set point
value.
H button: Decrease set point
value.
E
Fig 10
SET
E
By pressing the "SET"
button, the calibration
is completed.
Turn off the power and
verify the load connected
output 1.
Output 1 (Black wire)
could be shorted out.
Verify that the output is not
shorted out and then reset
the switch.
Output 2 output current
is exceeding 80mA.
Turn off the power and
verify the load connected
output 2.
Output 2 (white wire)
could be shorted out.
Verify that the output is not
shorted out and then reset
the switch.
Fig 11
Interlock circuit:
If using switches in an interlock circuit ensure multiple switch
functions are used and monitor the system on a regular basis.
Integrating flow function
H (Fixed hysteresis)
=3digit
• Window comparator mode
Output 1 output current
is exceeding 80mA.
Ensure all air and power supplies are ISOLATED before carrying out
any maintenance work.
Ensure correct operation of a switch on a regular basis.
Other functions (Fig 10)
Output mode
Table 2
Push the Up and Down
buttons to reset all the
data.
CAUTION
Fig 9
Press the "H" and the "SET"
buttons simultaneously. Display
stops the integration and keeps
the integrated value at that time.
To start the integration again,
press the "H" and the "SET"
buttons simultaneously. Display is
cleared by pressing the "G" and
the "H" buttons simultaneously
for more than two seconds.
Press the "SET" button for
more than three seconds until
the display changes to "
".
Select "
" by pressing the
"G" button.
E
For additional information please contact your local SMC office, see
details below.
SET
By pressing
the "SET"
button, the
calibration
is completed.
E
SET
By pressing
the "SET"
button, the
calibration
is completed.
Solution
Calibration was changed
by accident, reason
unknown.
Maintenance
ON=C.C1
OFF=C-3digit, C1-3digit
(1 digit is the min. setting unit.)
For water
Fig 8
SET
OFF
Table 1
No.
1
2
)
Cause
When you enquire about the product, please contact the following
SMC Corporation:
ENGLAND
Phone 01908-563888
TURKEY
Phone 212-2211512
ITALY
Phone 02-92711
GERMANY Phone 6103-402-0
HOLLAND
Phone 020-5318888
FRANCE
Phone 01-64-76-10-00
SWITZERLAND Phone 052-396 31 31
SWEDEN
Phone 08-603 07 00
SPAIN
Phone 945-184100
AUSTRIA
Phone 02262-62-280
Phone 902-255255
IRELAND
Phone 01-4501822
GREECE
Phone 01-3426076
DENMARK Phone 70 25 29 00
FINLAND
Phone 09-68 10 21
NORWAY
Phone 67-12 90 20
BELGIUM
Phone 03-3551464
POLAND
Phone 48-22-6131847
PORTUGAL Phone 02-610 8922