Datasheet
Specifications (Integrated Display)
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.
The OUT2 can be selected from the output for temperature or flow rate by
button operation.
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) When 0.5 s is selected for the response time of the switch output, the repeatability becomes 3% F.S.
Note 3) Operating pressure range and proof pressure change according to the fluid temperature. Refer to page 4.
Note 4) Cleared by turning off the power supply. It is possible to select the function to memorize it. (Every 2 or 5 minutes) When 5 minutes memorizing is selected, the
lifetime of the memory element (electronic part) is 1 million times (5 minutes x 1 million times = 5 million minutes = Approx. 9.5 years for 24 hour energizing).
Calculate the lifetime based on your operating conditions before using the memorizing function, and do not exceed it.
Note 5) The response time when the set value is 90% in relation to the step input. (The response time is 7 s when it is output by the temperature sensor.)
Note 6) 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 7) When the temperature sensor is used, it will be 250 VAC.
Note 8) Refer to “Wetted Parts Construction” on page 6 for details.
Note 9) External scratch marks and dirt are judged as good parts provided that they do not affect product performance.
Model
PF3W704 PF3W720 PF3W711PF3W740
Applicable fluid
Detection method
Rated flow range
Display flow range
Set flow range
Minimum setting unit
Conversion of accumulated pulse (Pulse width: 50 ms)
Fluid temperature
Display unit
Accuracy
Repeatability
Temperature characteristics
Operating pressure range
Note 3)
Proof pressure
Note 3)
Pressure loss (without flow adjustment valve)
Accumulated flow range
Note 4)
Switch output
Analog output
Hysteresis
External input
Display method
Indicator light
Power supply voltage
Current consumption
Environment
Standards and regulations
Wetted parts material
Note 8)
Piping port size
Maximum load current
Maximum applied voltage
Internal voltage drop
Response time
Note 2), 5)
Output protection
Output
mode
Response time
Note 6)
Voltage output
Current output
Enclosure
Operating temperature range
Operating humidity range
Withstand voltage
Note 7)
Insulation resistance
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
Water and ethylene glycol aqueous solution (with viscosity of 3 mPa·s [3 cP] or less)
Note 1)
Karman vortex
0.1 L/min
0 to 90C (with no freezing and condensation)
Instantaneous flow rate: L/min, Accumulated flow: L
Display value: 3% F.S. Analog output: 3% F.S.
2% F.S.
Note 2)
5% F.S. (25C reference)
0 to 1 MPa
1.5 MPa
45 kPa or less at the maximum flow
NPN or PNP open collector output
80 mA
28 VDC
NPN: 1 V or less (at 80 mA load current) PNP: 1.5 V or less (at 80 mA load current)
0.5 s/1 s/2 s
Short circuit protection
Select from hysteresis mode, window comparator mode, accumulated output mode, or accumulated pulse output mode.
Select from hysteresis mode or window comparator mode.
0.5 s/1 s/2 s (linked with the switch output)
Voltage output: 1 to 5 V Output impedance: 1 k
Output current: 4 to 20 mA Max. load impedance: 300 for 12 VDC, 600 for 24 VDC
Variable
Voltage free input: 0.4 V or less (Reed or Solid state), input for 30 ms or longer
2-screen display (Main screen: 4-digit, 7-segment, 2-color, Red/Green Sub screen: 6-digit, 11-segment, White) Display values updated 5 times per second
Output 1, Output 2: Orange
12 to 24 VDC 10%
50 mA or less
IP65
0 to 50°C (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
2 to 16 L/min
1.7 to 22.0 L/min
0.1 L/pulse
5 to 40 L/min
3.5 to 55.0 L/min
0.5 L/pulse
10 to 100 L/min
7 to 140 L/min
1 L/min
1 L/pulse
0.5 to 4 L/min
0.35 to 5.50 L/min
0.01 L/min
0.05 L/pulse
3/8, 1/2
260 g
335 g
360 g
435 g
1/2, 3/4
410 g
530 g
610 g
730 g
3/4, 1
720 g
860 g
—
—
3/8
210 g
285 g
310 g
385 g
By 0.1 L By 0.5 L
99999999.9 L
999999999 L
By 1 L
Rated temperature range
Setting/Display temperature range
Minimum setting unit
Display unit
Display accuracy
Analog output accuracy
Response time
Ambient temperature characteristics
0 to 100C
Note 1)
–10 to 110C
1C
C
2C
3% F.S.
7 s
Note 2)
5% F.S.
The output related to the temperature sensor is OUT2 only.
Flow rate detecting circuit
OUT1 Switch output
OUT2 Switch output
Analog output
Main circuit
Temperature detecting circuit
Brown DC (+)
Black OUT1
White OUT2
Blue DC (–)
Flow rate
Temperature
PF3W721
50 to 250 L/min
20 to 350 L/min
2 L/min
2 L/pulse
60 kPa or less at the maximum flow
1 1/4, 1 1/2
890 g
1075 g
—
—
+85 g
Weight
0.35 to 5.50 L/min
(Flow under 0.35 L/min is displayed as “0.00”)
1.7 to 22.0 L/min
(Flow under 1.7 L/min is displayed as “0.0”)
3.5 to 55.0 L/min
(Flow under 3.5 L/min is displayed as “0.0”)
7 to 140 L/min
(Flow under 7 L/min is displayed as “0”)
20 to 350 L/min
(Flow under 20 L/min is displayed as “0”)
Refer to “Handling Precautions for SMC Products” for Flow Switch Precautions and
the Operation Manual in our website for Specific Product Precautions.
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Function
Details
2
Digital Flow Switch for Water
Series PF3W
3-color display