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PF3A
H(-L)
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Function Details
* The pressure and temperature settings are only available for the PF3A8
Output operation
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The output operation can be selected from the following:
Output (hysteresis mode and window comparator mode) corresponding
to instantaneous flow, pressure, and temperature, or output (accumulated
output and pulse output) corresponding to accumulated flow
(Default setting: Hysteresis mode, Normal output)
Simple setting mode
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Only the set values for instantaneous flow, accumulated flow,
pressure, and temperature can be changed. The output mode, output
type, display color, and accumulated pulse output cannot be changed.
Display color
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The display color can be selected for each
output status. The selection of the display
color provides visual identification of abnor-
mal values.
Reference condition
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The display unit can be selected from standard conditions or normal conditions.
Standard conditions: Flow rate converted to a volume at 20°C and 101.3 kPa (absolute pressure)
Normal conditions: Flow rate converted to a volume at 0°C and 101.3 kPa (absolute pressure)
Response time (Digital filter)
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The response time (digital filter) can be set to
suit the application.
(Default setting: Flow rate: 1 s, Pressure: 0.1 s)
The effects of fluctuation and the flickering of the
display can be reduced by changing the response
time (digital filter).
FUNC output switching function
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Analog output or external input can be selected.
Selectable analog output function
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1 to 5 V or 0 to 10 V can be selected for the analog voltage output
type. (Default setting: 1 to 5 V)
External input function
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The accumulated flow, peak value, and bottom value can be reset
remotely.
Accumulated value external reset: The accumulated flow value is reset via external in-
put signal.
In accumulated increment mode, the accumulated
value will reset to and increase from zero.
In accumulated decrement mode, the accumulated
value will reset to and decrease from the set value.
* When the accumulated value is stored to memory, every time the accumulated value
external reset is activated, the memory will be accessed. Take into consideration that
the max. number of times the memory can be accessed is 1 . 5 million times. The total
number of external inputs and the accumulated value memorizing time interval should
not exceed 1.5 million times.
Peak/Bottom value reset: The peak value and bottom value are reset.
Forced output function
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The output is forced ON/OFF when starting the system or during
maintenance. This enables confirmation of the wiring and prevents
system errors due to unexpected output.
For the analog output type: When ON, the output will be 5 V or 20 mA,
and when OFF, 1 V or 4 mA.
For the IO-Link compatible PF3A
flow rate) and process data (PD) flow measurement can be checked.
* Also, the increase or decrease of the flow will not change the ON/OFF status
of the output while the forced output function is activated.
Accumulated value hold
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The accumulated value is not cleared even when the power supply is
turned OFF. The accumulated value is memorized every 2 or 5
minutes during measurement and continues from the last memorized
value when the power supply is turned ON again.
The max. writable limit of the memory device is 1.5 million times,
which should be taken into consideration.
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Series
Green for ON, Red for OFF
Red for ON, Green for OFF
Red all the time
Green all the time
Flow rate
Pressure
1 s
0 to 30 s
2 s
(Increments
5 s
of 0.01 s)
(Default setting: Analog output)
H-L series, diagnostic bit (error and
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H-L series.
For the setting of functions and operation methods,
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refer to the "Operation Manual" on the SMC website.
Peak/Bottom value display
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The max. (min.) flow rate is detected and updated from when the power
supply is turned ON. In peak (bottom) value display mode, this max.
(min.) flow rate as well as the pressure and temperature are displayed.
Display OFF mode
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This function will turn the display OFF.
In the display OFF mode, three digits "_ _ _ " on the right side of the sub
display will flash.
If any button is pressed during this mode, the display reverts to normal for 30
seconds to allow the flow, pressure, temperature, etc., to be quickly checked.
When a flow monitor (PFG300 series) is connected, the displayed values
might be different due to an error. When a flow monitor display is to be used,
it is recommended that this product be set to the display OFF mode.
Setting of a security code
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The user can select whether a security code must be entered to re-
lease the key lock. At the time of shipment from the factory, it is set
such that a security code is not required.
Key-lock function
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Prevents operation errors such as accidentally changing setting values
Reset to the default settings
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The product can be returned to its factory default settings.
Temp.
Reversible display mode
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When the switch is used upside down, the orientation of the display can
1 s
be rotated to make it easier to read by using the reversible display
function.
OUT
OUT
Zero cut-off function
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When the flow is close to 0 L/min, the product will round the value
down and zero will be displayed. A flow value may be displayed even
when the flow rate is 0 L/min due to high pressure or depending on
the installation. The zero cut-off function will force the display to
zero. The range to display zero can be changed.
(For the PF3A8
H-L series, the pressure is also subject to this function.)
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Example) Vertical mounting, Fluid direction: Bottom to top
Delay time setting
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(PF3A
H-L series only)
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The time from when the instantaneous flow, pressure, and temperature
reach the set values to when the switch output operates can be set.
Setting the delay time can prevent the switch output from chattering.
The total switching time is the switch operation time and the set delay
time.
(Default setting: 0 s)
IN
When the display is upside down
Reversible
display function
IN
OUT
OUT
Zero cut-off
function
IN
IN
(Increments of 0.01 s)
0 to 60 s
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