Function Details - SMC Networks PF2M7 Series Manual

PF2M7(-L)

Function Details

 Output operation
The output operation can be selected from the following:
Output corresponding to instantaneous flow (Hysteresis mode,
Window comparator mode)
· Hysteresis mode is the 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 by the amount of
hysteresis or more.
· Window comparator mode is the mode where 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.
Output corresponding to accumulated flow (Accumulated output
mode, Accumulated pulse output mode)
· In accumulated output mode, the switch output will start at the set
accumulated flow rate value.
· Accumulated pulse output is a pulse signal which is output every
time a predefined accumulated flow has passed.
Others (Error output, Switch output OFF)
· The error output function outputs the switch output when an error
is displayed.
· The switch output off function turns off the switch output.
* Default setting: Hysteresis mode, Normal output
 Simple setting mode
Only the set values for instantaneous flow and accumulated flow can
be changed. Output mode, output type, display color, and accumulate
pulse output cannot be changed.
 Display color
The display color can be selected for each
output condition. The selection of the dis-
play color provides visual identification of
abnormal values.
 Reference condition
The display unit can be selected from standard condition or normal condition.
Standard condition: Flow rate converted to a volume at 20°C, 101.3 kPa (absolute pressure), and 65% RH
Normal condition: Flow rate converted to a volume at 0°C, 101.3 kPa (absolute pressure), and 0% RH
 Delay time setting
The time from when the instantaneous
flow reaches the set value 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)
 Digital filter setting
The time for the digital filter can be set to the sensor
input. Setting the digital filter can reduce chattering of the
switch output and flickering of the analog output and the
display.
The response time indicates when the set value is 90% in
relation to the step input.
(Default setting: 1 s)
 Selectable analog output function
1 to 5 V or 0 to 10 V can be selected for the analog voltage output type.
(Default setting: 1 to 5 V)
Series
Green for ON, Red for OFF
Red for ON, Green for OFF
Red all the time
Green all the time
0 to 0.10 s (increment of 0.01 s)
0.1 to 1.0 s (increment of 0.1 s)
1 to 10 s (increment of 1 s)
20 s
30 s
40 s
50 s
60 s
0.05 s
0.1 s
0.5 s
1 s
2 s
5 s
For setting of functions and operation method, refer
to the Operation Manual from the SMC website
Documents/Download --> Instruction Manuals.
 Forced output function
The output is turned on/off in a fixed state when starting the system
or during maintenance. This enables the confirmation of wiring and
prevents system errors due to unexpected output.
For the analog output type: When ON, the output will be 5 V (or 10 V
when 0 to 10 V is selected) or 20 mA, and when OFF, 1 V (or 0 V
when 0 to 10 V is selected) or 4 mA.
* Also, an 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
The accumulated value will be stored even if 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 maximum writable limit of the memory device is 3.7 million times,
which should be taken into consideration.
 Peak/Bottom value display
The maximum (minimum) flow rate is detected and updated from
when the power supply is turned on. In peak (bottom) value display
mode, this maximum (minimum) flow rate is displayed.
 Display OFF mode
This function will turn the display OFF. In this mode, "_ _ _" will flash
on the main screen. If any button is pressed during this mode, the
display reverts to normal for 30 seconds to allow checking of the flow,
etc.
 Setting of security code
The user can select whether a security code must be entered to re-
lease the key lock. At the time of factory shipment, it is set so that a
security code is not required.
 Key-lock function
Prevents operation errors such as accidentally changing setting values
 Reset to the default settings
The product can be returned to its factory default settings.
 Reversible display mode
When the switch is used upside down, the orientation of the display
can be rotated to make it easier to read by using the reversible display
function.
OUT
When display is upside down
OUT
 Zero cut-off function
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.
 Zero-clear function
The measured flow rate indication can be adjusted to zero.
The adjustment range is ±5% F.S. of the initial factory setting.
IN
Reversible
display function
IN
24