SMC Corporation PF2A20 Series User manual

No.PF##-OMH0003-B
PRODUCT NAME
Flow Monitor
MODEL / Series / Product Number
PF2A20#
PF2W20#
PF2D20#

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No.PF##-OMH0003-B
Table of Contents
Safety Instructions 2
Model Indication and How to Order 9
Summary of Product parts 12
Definition and terminology 13
Mounting and Installation 15
Installation 15
Wiring 16
Outline of setting 19
List of outputs 20
Initialize mode 21
Setting procedure of Initialize mode 21
Function selection mode 26
F_1 Input procedure of the Set value of instantaneous output 27
F_2 Input procedure of the Set value of accumulated output 28
F_3 Copy function 30
Other functions 31
Channel scan function 31
Peak / Bottom value display 31
Key-lock function 32
Maintenance 32
Troubleshooting 34
Cross-reference for troubleshooting 34
Error indication 36
Specifications 37
Specifications 37
Dimensions 41

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No.PF##-OMH0003-B
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) ∗1) and other safety regulations.
∗1) ISO 4414: Pneumatic fluid power -- General rules relating to systems
ISO 4413: Hydraulic fluid power -- General rules relating to systems
IEC 60204-1: Safety of machinery -- Electrical equipment of machines (Part 1: General requirements)
ISO 10218-1992: Manipulating industrial robots -Safety.
etc.
Caution : CAUTION indicates a hazard with a low level of risk which, if not avoided,
could result in minor or moderate injury.
Warning : WARNING indicates a hazard with a medium level of risk which, if not
avoided, could result in death or serious injury.
Danger : DANGER indicates a hazard with a high level of risk which, if not avoided,
will result in death or serious injury.
Warning
1. The compatibility of the product is the responsibility of the person who designs the
equipment or decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with
specific equipment must be decided by the person who designs the equipment or decides its
specifications based on necessary analysis and test results. The expected performance and safety
assurance of the equipment will be the responsibility of the person who has determined its
compatibility with the product. This person should also continuously review all specifications of the
product referring to its latest catalog information, with a view to giving due consideration to any
possibility of equipment failure when configuring the equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly. The assembly, operation and
maintenance of machines or equipment including our products must be performed by an operator
who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
1. The inspection and maintenance of machinery/equipment should only be performed after measures
to prevent falling or runaway of the driven objects have been confirmed.
2. When the product is to be removed, confirm that the safety measures as mentioned above are
implemented and the power from any appropriate source is cut, and read and understand the
specific product precautions of all relevant products carefully.
3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and
malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the product is
to be used in any of the following conditions.
1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed
to direct sunlight.
2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or
other applications unsuitable for the standard specifications described in the product catalog.
3. An application which could have negative effects on people, property, or animals requiring special
safety analysis.
4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by
using a mechanical protective function, and periodical checks to confirm proper operation.

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No.PF##-OMH0003-B
Caution
The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC beforehand and exchange
specifications or a contract if necessary.
If anything is unclear, contact your nearest sales branch.
Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following "Limited warranty and Disclaimer" and "Compliance
Requirements".
Read and accept them before using the product.
Limited warranty and Disclaimer
1. The warranty period of the product is 1 year in service or 1.5 years after the product is delivered. ∗2)
Also, the product may have specified durability, running distance or replacement parts. Please
consult your nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our responsibility, a
replacement product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other damage
incurred due to the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and disclaimers noted
in the specified catalog for the particular products.
∗2) Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum pad or failure due to
the deterioration of rubber material are not covered by the limited warranty.
Compliance Requirements
1. The use of SMC products with production equipment for the manufacture of weapons of mass
destruction (WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by the
relevant security laws and regulation of the countries involved in the transaction. Prior to the
shipment of a SMC product to another country, assure that all local rules governing that export are
known and followed.

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No.PF##-OMH0003-B
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.
■Safety Instructions Warning
■Do not disassemble, modify (including changing the printed circuit board) or repair.
An injury or failure 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.
■Do not operate in an atmosphere containing flammable, explosive or corrosive gas.
Fire, explosion or corrosion can result.
This product is not designed to be explosion proof.
■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
•Ensure the flow is shut off before performing maintenance
Otherwise an injury can result. Caution
■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 touch the piping or its connected parts when the fluid is at high temperature.
It may lead to burnt.
Ensure the piping cools sufficiently before touching.
■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.

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No.PF##-OMH0003-B
■NOTE
○Follow the instructions given below when designing, selecting and handling the product.
●The instructions on design and selection (installation, wiring, environment, adjustment, operation,
maintenance, etc.) described below must also be followed.
∗Product specifications
•Use the specified voltage.
Otherwise failure or malfunction can result.
Insufficient supply voltage may not drive a load due to a voltage drop inside the product.
Verify the operating voltage of the load before use.
•Do not exceed the specified maximum allowable load.
Otherwise it can cause damage or shorten the lifetime of the product.
•Data stored by the product is not deleted, even if the power supply is cut off.
(writing time: 1000000 cycles)
•Reserve a space for maintenance.
Allow sufficient space for maintenance when designing the system.

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No.PF##-OMH0003-B
●Product handling
∗Installation
•Do not apply excessive stress to the product when it is panel mounted.
Otherwise damage to the product and disconnection from the panel mount can result.
•Ensure that the FG terminal is connected to ground when using a commercially available switch-mode
power supply.
•Do not drop, hit or apply excessive shock to the product.
Otherwise damage to the internal parts can result, causing malfunction.
•Do not pull the lead wire forcefully, not lift the product by pulling the lead wire. (Tensile force 49 N or less)
Hold the product body when handling, to prevent damage, failure or malfunction.
•Never mount the product in a location that will be used as a foothold.
The product may be damaged if excessive force is applied by stepping or climbing onto it.
∗Wiring
•Do not pull the lead wires.
In particular, never lift a product equipped with fitting and piping by holding the lead wires.
Otherwise damage to the internal parts can result, causing malfunction or disconnection of the connector.
•Avoid repeatedly bending or stretching the lead wire, or placing heavy load on it.
Repeated bending stress or tensile stress can cause damage to the sheath, or breakage of the wires.
If the lead wire can move, fix it near the body of the product.
The recommended bend radius of the lead wire is 6 times the outside diameter of the sheath, or 33 times the
outside diameter of the wire insulation material, whichever is larger.
Replace any damaged lead wire with a new one.
•Wire correctly.
Incorrect wiring can damage the product.
•Do not perform wiring while the power is on.
Otherwise damage to the internal parts can result, causing malfunction.
•Do not route wires and cables together with power or high voltage cables.
Otherwise the product can malfunction due to interference or noise and surge voltage from power and high voltage
cables.
•Confirm proper insulation of wiring.
Poor insulation (interference from another circuit, poor insulation between terminals, etc.) can lead to excess
voltage or current being applied to the product, causing damage.
•Keep wiring as short as possible to prevent interference from electromagnetic noise and surge voltage.
Do not use a cable longer than 10 m.
Wire the DC(-) line (blue) as close as possible to the power supply.
•When analogue output is used, install a noise filter (line noise filter, ferrite element, etc.) between the
switch-mode power supply and this product.

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No.PF##-OMH0003-B
∗Environment
•Do not use the product in an environment that is constantly exposed to the splash of water.
Otherwise failure or malfunction can result. Take measures such as using a cover.
•Do not use the product in an environment where corrosive gases or fluids could be splashed.
Otherwise damage to the product and malfunction can result.
•Do not use in a place where the product could be splashed by oil or chemicals.
If the product is to be used in an environment containing oils or chemicals such as coolant or cleaning solvent,
even for a short time, it may be adversely affected (damage, malfunction, or hardening of the lead wires).
•Do not use in an area where electrical surges are generated.
If there is equipment generates a large electrical surge (solenoid type lifter, high frequency induction furnace, motor,
etc.) close to the product, damage or failure of the internal circuit may occur. Take measures against the surge
sources, and prevent the wires from coming into close contact.
•Do not use a load which generates surge voltage.
When a surge-generating load such as a relay or solenoid is driven directly, use a product with a built-in surge
absorbing element.
•The product is CE marked, but not immune to lightning strikes. Take measures against lightning strikes
in the system.
•Do not use the product in areas that are exposed to vibration or impact.
Otherwise failure or malfunction can result.
•Do not use the product in the presence of a magnetic field.
This may lead to the malfunction of the product.
•Prevent foreign matter such as remnant of wires from entering the product.
Otherwise failure or malfunction can result.
•Do not use the product in areas subject to large temperature cycle.
Heating/cooling cycles other than ordinary changes in temperature can adversely affect the internal structure of the
product
•Do not expose the product to direct sunlight.
If using in a location directly exposed to sunlight, use a suitable protective cover.
Otherwise failure or malfunction can result.
•Keep within the operating temperatures range.
The operating temperature range is 0 to 50 oC.
Operation below the minimum temperature limit may cause damage or operation failure due to frozen moisture in
the fluid or air.
Avoid sudden temperature changes even within the specified temperature range.
•Do not operate close to a heat source, or in a location exposed to radiant heat.
Otherwise malfunction can result.

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No.PF##-OMH0003-B
∗Adjustment and Operation
•Connect load before turning on the power.
Otherwise it can cause excess current causing instantaneous damage to the product.
•Do not short-circuit the load.
Although an error is displayed when the product load is short circuited, excess current may cause damage to the
product.
•Do not press the setting buttons with a sharp pointed object.
This may damage the setting buttons.
•Supply the power when there is no flow.
•The output is off for 3 seconds after power is supplied.
•Use settings suitable for the operating conditions.
Incorrect settings can cause operational failure.
(Refer to page 19 "Outline of setting")
•During the initial setting and any subsequent flow rate setting, the product will switch the output
according to the existing settings until the changes are complete.
Confirm the output has no adverse effect on machinery and equipment before setting.
Stop the control system before setting if necessary.
•Do not touch the LCD during operation.
The display can vary due to static electricity.
∗Maintenance
•Perform regular maintenance and inspections.
There is a risk of unexpected malfunction of components due to the malfunction of equipment and machinery.
•Turn off the power supply, stop the fluid and check the safety before performing any maintenance.
There is a risk of unexpected malfunction.
•Do not use solvents such as benzene, thinner etc. to clean the product.
They could damage the surface of the body and erase the markings on the body.
Use a soft cloth to remove stains.
For heavy stains, use a cloth lightly dampened with diluted neutral detergent, then wipe up any residue with a dry
cloth.

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No.PF##-OMH0003-B
Model indication and How to Order

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No.PF##-OMH0003-B
Option 1
Nil A
without panel mount adapter
with panel mount adapter
B
with panel mount adapter + front protective cover
∗: Each accessory is not assembled with the product, but shipped together.
Option 2
Nil 4C
without sensor connector
with sensor connector (4 pcs.)
∗: Each accessory is not assembled with the product, but shipped together.

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No.PF##-OMH0003-B
Accessories / Part number
If an accessory is required separately, order using the following part numbers.
Part number Description Remarks Weight
ZS-26-A Power and output cable Length: 2 m 65 g
ZS-26-B Panel mount adapter with waterproof seal, with Mounting screw (3.0 x 8 L) 2 pcs. 10 g
ZS-26-C Panel mount adapter +
front protective cover with waterproof seal, with Mounting screw (3.0 x 8 L) 2 pcs. 15 g
ZS-26-01 Front protective cover
only 5 g
ZS-26-D □48 mm conversion
adapter
The panel which hold is □48 can be mounted to □36 by using the
adapter.
5 g
ZS-28-CA-3
Sensor connector for
PF2A5/PF2W5/
PF3W5
(e-con)
1 pc, Finished O.D.: φ1.0 to φ1.15, Cover color: Yellow 2 g
ZS-28-C 1 pc, Finished O.D.: φ0.8 to φ1.0, Cover color: Red 2 g
ZS-28-CA-1 1 pc, Finished O.D.: φ0.6 to φ0.9, Cover color: Orange 2 g
ZS-28-CA-2
Sensor connector
for PF2D5
(e-con) 1 pc, Finished O.D.: φ0.9 to φ1.0, Cover color: Red 2 g

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No.PF##-OMH0003-B
Summary of Product parts
Front
Item Description
Unit display Indicates the unit currently selected, and automatically displays instantaneous
flow or accumulated flow units according to the display mode.
LCD display Displays the flow value, setting mode, and error indication.
Indicator LED (output) Indicates the switch output status. LED is ON when the output is ON.
Indicator LED ∗Indicates the reference condition selected. LED is ON (Red) when normal
condition is selected. (Only the PF2A)
Channel display Indicates the channel selected (CH1 to CH4).
button (UP) Selects the mode or increases the ON/OFF Set value.
button (SET) Press this button to change the mode and to set a value.
button (DOWN) Selects the mode or decreases the ON/OFF Set value.
∗: Operate only the PF2A2 series.
Back Sensor connector
pin numbers (on the product)
1 DC(+) Brown
2 N.C.
3 DC(-) Blue
White (PF25)
4Sensor input
(1 to 5 V) Black (PF3W5)
Power and output connector
pin numbers (on the product)
1 DC(+)
2 DC(-)
3 CH1_OUT1
4 N.C.
5 CH2_OUT1
6 CH3_OUT1
7 CH4_OUT1
8 N.C.
Item Description
Sensor connector socket Socket for the sensor connection.
Power and output socket Socket for the power and output connection.
Sensor connector Connector for attaching (crimping) to the sensor lead wire.
Power and output cable Cable to supply power to the product and transmit outputs.

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No.PF##-OMH0003-B
■Definition and terminology
Terms Meaning
Accumulated flow The total amount of fluid that has passed through the device. If an instantaneous flow of
10 L/min continues for 5 minutes, the accumulated flow will be 5×10 = 50 L.
Accumulated pulse
output
A type of output where a pulse is generated every time a predefined accumulated flow
passes. It is possible to calculate the total accumulated flow by counting the pulses.
A
Analogue output
Outputs a value proportional to the flow rate. When the analogue output is in the range
1 to 5 V, it will vary between 1 to 5 V according to the rate of flow. The same for
analogue output of 4 to 20 mA.
C Chattering The problem of the switch output turning ON and OFF repeatedly around the Set value
at high frequency due to the effect of pulsation.
Digit Minimum unit for setting / display is 1 digit. When the minimum unit for setting / display
is 5 L/min, 3 digits will be 3 x 5 = 15 L/min
D
Display flow range The range that which can be displayed by the product with a digital display.
F F.S.
(Full span, Full scale)
Stands for "full span" or "full scale", and indicates varied analogue output range at rated
value. For example, when analogue output is 1 to 5 V, F.S. = 5[V] - 1[V] = 4[V], (ref.
1%F.S. = 4[V] x 1% = 0.04[V])
Hysteresis The difference between ON and OFF points used to prevent chattering. Hysteresis can
be effective in avoiding the effects of pulsation.
H
Hysteresis mode Mode where the switch output will turn ON when the flow is greater than the Set value,
and will turn OFF when the flow falls below the Set value – hysteresis value.
Instantaneous flow The flow passing per unit of time. If it is 10 L/min, there is a flow of 10 L passing through
the device in 1 minute.
I
Internal voltage drop
The voltage drop across the product (and therefore not applied to the load), when the
switch output is ON. The voltage drop will vary with load current, and ideally should be
0 V.
M Minimum
setting/display unit
The resolution of set and display values. If the minimum setting unit is 1 L/min, the
display will change in 1 L/min steps, e.g. 10…..11…..12 L/min.
N Normal condition Reference condition for volumetric flow: 101.3 kPa, 0 °C. The flow measurement which
is converted at normal atmospheric pressure conditions at 0 °C.
Operating humidity
range
The ambient humidity range within which the product will meet all published
specifications.
O
Operating
temperature range
The ambient temperature range within which the product will meet all published
specifications.
Rated flow range The flow range within which the product will meet all published specifications.
Rated pressure range The pressure range within which the product will meet all published specifications.
Repeatability Reproducibility of the display or analogue output value, when the measured quantity is
repeatedly increased and decreased.
R
Response time Time from when the target flow is applied until the flow reaches 90% of the Set value.

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No.PF##-OMH0003-B
Terms Meaning
Setting flow range The range of ON/OFF threshold values that can be set for those products with a switch
output.
Standard condition Flow display which is converted in atmospheric pressure at 20 °C, 65%R.H.
S
Switch output
Output type that has only 2 conditions, ON or OFF. In the ON condition, an indicator
light (output) will show, and any connected load will be powered. In the OFF condition,
there will be no indicator (output) and no power supplied to the load.
T Temperature
characteristics
The amount of variation in the analogue output or display value when ambient
temperature is changed.
U Unit selection function A function to select display units other than the international unit (SI unit) specified in
the new Japanese measurement law. Flow can only be displayed by SI units in Japan.
W Window comparator
mode
An operating mode in which the switch output is turned on and off depending on
whether the flow is inside or outside the range of two Set values.

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No.PF##-OMH0003-B
Mounting and Installation
■Installation
•Never mount the product in a location that will be used as a foothold.
●Installing
Mounting with the panel mount adapter
•Install the product as shown below. The □48 mm conversion adapter is available if required.
•The panel mount adapter and the front cover can be rotated 90ofor mounting.
•Fix the panel mount adapter to the product with the mounting screws (nominal size: 3 x 8 L, 2 pcs.)
supplied.
•The front protective cover for panel mounting satisfies IP65 (when □48 mm conversion adapter is used, it
satisfies IP40). However, if the panel mount adapter is not fixed securely or the instrument is not seated
correctly, water might enter. After the product makes contact with the panel, the screws should be further
tightened 1/4 to 1/2 turn.
•The self tapping screws cannot be re-used.
•The product can be mounted on a panel with a thickness of 0.5 to 8 mm.
•Refer to the dimension drawing (page 42) for panel cut-out dimensions.
Removing the panel mount adapter
•The product with panel mount adapter can be removed from the installation by removing 2 screws and
releasing the hooks at the sides. The hooks can be released by inserting a suitable thin card.
•Pull the panel mount adapter to the front, and remove the product.
•If the panel mount adapter is pulled with the hook engaged, the product or the panel mount adapter will be
damaged.

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No.PF##-OMH0003-B
■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
Attaching the sensor connector to the sensor wire
•Strip the sensor wire as shown. Do not cut the insulator.
•Insert the corresponding wire colour shown in the table into the pin number printed on the sensor
connector, to the bottom.
Pin number on connector Wire colour (PF25) Wire colour (PF3W5)
1 Brown Brown
2 (N.C.) (N.C.)
3 Blue Blue
4 White Black
•Check that the above preparation has been performed correctly, then part A shown should be pressed in
by hand to make temporary connection.
•Part A should then be pressed in using a suitable tool, such as pliers.
•The sensor connector cannot be re-used once it has been fully crimped.
In cases of connection failure such as incorrect order of wires or incomplete insertion, please use the new
connector.
•If the sensor is not connected correctly, [---] will be displayed.

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No.PF##-OMH0003-B
Connecting / Disconnecting
•When connecting, insert the connectors straight into the body until it clicks.
•When removing the connector, press down the lever to release the hook from the housing and pull the
connector straight out.
Power and output connector pin numbers
(on the cable) Sensor connector pin numbers (on the cable)
•with PF25
1 DC(+) Brown
2 N.C.
3 DC(-) Blue
4 Sensor input
(1 to 5 V) White
•with PF3W5
1 DC(+) Brown
2 DC(-) Blue
3 CH1_OUT1 Black
4 N.C. White
5 CH2_OUT1 Grey
6 CH3_OUT1 Red
7 CH4_OUT1 Green
8 N.C. Yellow
1 DC(+) Brown
2 N.C.
3 DC(-) Blue
4 Sensor input
(1 to 5 V) Black

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No.PF##-OMH0003-B
●Internal circuit and wiring example
When the Power and output cable (ZS-26-A) is used, the wire colours will apply as shown in the diagram.
NPN (4 outputs) type
PF2A200-
Max. 30 V, 80 mA
Internal voltage drop: 1 V or less
PNP (4 outputs) type
PF2A201-
Max. 80 mA
Internal voltage drop: 1.5 V or less

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No.PF##-OMH0003-B
Outline of setting
Power is supplied
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.
Each time the button is pressed, a channel is selected "1 →2 →3 →4 →1 →⋅⋅⋅".
The flow value will be displayed for each channel selected.
Press the button to select either instantaneous flow or accumulated flow.
The display of instantaneous flow and accumulated flow can be changed
while the button is pressed.
While pressing the button during the display of accumulated flow,
the accumulation can be started / stopped by pressing the button.
button
press
for 2 sec.
button
press.
Initialize mode
(Refer to page 21)
Items below can be set.
•Connected sensor
•Display mode
•Unit selection function ∗1
•Output mode
•Switch operation
•Reference condition ∗2
Function selection
mode
(Refer to page 26)
Items below can be set.
•[F_1]
Input the Set value of
instantaneous output
•[F_2]
Input the Set value of
accumulated output
•[F_3] Copy function
Other functions
(Refer to page 31)
Items below can be set.
•Channel scan function
•Peak / Bottom value
display
•Key-lock function
∗1: Operate only the product with unit selection function.
∗2: Operate only the PF2A2 series.