Datasheet
4 L/min
Set the flow within the rated flow range.
The set flow range is the range of flow rate that is possible in setting.
The rated flow range is the range that satisfies the sensor’s specifications (accuracy etc.).
Although it is possible to set a value outside the rated flow range, the specifications will not be guaranteed even
if the value stays within the set flow range.
Caution
Set Flow Range and Rated Flow Range
Rated flow range
Display flow range Set flow range
In the case of the PF3W5 series, the displayable and settable ranges are
the same as the PF3W3 series flow monitor.
Sensor
Flow range
0.5 L/min 2 L/min 5 L/min
20 L/min
40 L/min
250 L/min140 L/min100 L/min 350 L/min
PF3W704
PF3W504
PF3W720
PF3W520
PF3W740
PF3W540
PF3W711
PF3W511
0.5 L/min
2 L/min
5 L/min
3.5 L/min
3.5 L/min
1.7 L/min
1.7 L/min
0.35 L/min
0.35 L/min
5.5 L/min
5.5 L/min
16 L/min
22 L/min
22 L/min
40 L/min
55 L/min
55 L/min
10 L/min
7 L/min
7 L/min
100 L/min
140 L/min
140 L/min
PF3W721
50 L/min
20 L/min
20 L/min
250 L/min
350 L/min
350 L/min
PF3W521
50 L/min
20 L/min
20 L/min
250 L/min
280 L/min
280 L/min
Specifications (Remote Sensor Unit)
Temperature Sensor Specifications
Note 1) The rated temperature range is for the temperature sensor alone.
The fluid temperature range specification of the flow switch as a whole is 0 to 90C.
Note 2) The response time is for the temperature sensor alone.
Note 1) Refer to “Measurable Range
for Ethylene Glycol Aqueous
Solution” on page 6.
Measurement can be
performed with a fluid that
does not corrode wetted
parts and has viscosity of
3 mPa·s [3 cP] or less. Be
aware that water leakage
may happen due to internal
seal shrinkage or swelling
depending on kinds of fluid.
Note 2) Operating pressure range and
proof pressure change
according to the fluid
temperature. Refer to the
graphs below.
Note 3) The response time until the
set value reaches 90% in
relation to the step input.
(The response time is 7 s
when it is analog output by
the temperature sensor.)
Note 4) When the temperature sensor
is used, it will be 250 VAC.
Note 5) Refer to “Wetted Parts
Construction” on page 6 for
details.
Note 6) External scratch marks and
dirt are judged as good parts
provided that they do not
affect product performance.
Model
PF3W504 PF3W520 PF3W511PF3W540
Applicable fluid
Detection method
Rated flow range
Fluid temperature
Accuracy
Repeatability
Temperature characteristics
Operating pressure range
Note 2)
Proof pressure
Note 2)
Pressure loss (without flow adjustment valve)
Analog output
Indicator light
Power supply voltage
Current consumption
Environment
Standards and regulations
Wetted parts material
Note 5)
Piping port size
Response time
Note 3)
Voltage output
Current output
Enclosure
Operating temperature range
Operating humidity range
Withstand voltage
Note 4)
Insulation resistance
Water and ethylene glycol aqueous solution (with viscosity of 3 mPa·s [3 cP] or less)
Note 1)
Karman vortex
0 to 90C (with no freezing and condensation)
3% F.S.
2% F.S.
5% F.S. (25C reference)
0 to 1 MPa
Note 2)
1.5 MPa
1s
Output current: 4 to 20 mA Max. load impedance: 300
for 12 VDC, 600
for 24 VDC
For power supply status, flow rate indicator (Blinking speed changes in response to flow rate), and other error indicator
12 to 24 VDC 10%
30 mA or less
IP65
0 to 50C (with no freezing and condensation)
Operation, Storage: 35 to 85% R.H. (with no condensation)
1000 VAC for 1 minute between
terminals and housing
50 M or more (500 VDC measured via megohmmeter) between terminals and housing
CE marking, UL (CSA), RoHS
PPS, Stainless steel 304, FKM, SCS13
Non-grease
+85 g
45 kPa or less at the maximum flow
0.5 to 4 L/min 2 to 16 L/min 5 to 40 L/min
10
to
100 L/min 50
to
250 L/min
60 kPa or less at the maximum flow
3/8, 1/2
245 g
320 g
345 g
415 g
1/2, 3/4
395 g
515 g
595 g
715 g
3/4, 1
705 g
840 g
—
—
Rated temperature range
Analog output accuracy
Response time
Ambient temperature characteristics
0 to 100C
Note 1)
3% F.S.
7 s
Note 2)
5% F.S.
PF3W521
1 1/4, 1 1/2
875 g
1060 g
—
—
Refer to page 18 for monitor unit specifications.
3/8
195 g
270 g
295 g
370 g
Voltage output: 1 to 5 V Output impedance: 1 k
Without temperature sensor/Without flow adjustment valve
With temperature sensor/Without flow adjustment valve
Without temperature sensor/With flow adjustment valve
With temperature sensor/With flow adjustment valve
With lead wire with connector
Refer to “Handling Precautions for SMC Products” for Flow Switch Precautions and
the Operation Manual in our website for Specific Product Precautions.
Weight
3
Series PF3W