Definition And Terminology - SMC Networks PF3WB Series Operation Manual

■Definition and terminology

Terms
A Accumulated flow
(Integrated display type)
Accumulated flow
external reset
(Integrated display type)
Accumulated pulse output
(Integrated display type)
Analogue output
Attachment
C
Cavitation
Chattering
(Integrated display type)
D
Delay time
(Integrated display type:
IO-Link)
Digital filter
(Integrated display type:
IO-Link)
Display flow range
(Integrated display type)
FLOW indicator
F
(Remote sensor)
Fluid temp.
F.S.
(Full span, Full scale)
H
Holding of accumulated
flow
(Integrated display type)
Hysteresis
(Integrated display type)
Hysteresis mode
(Integrated display type)
I
Instantaneous flow
Internal voltage drop
(Integrated display type)
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 10 × 5 = 50 L.
A function to reset the accumulated flow to zero by using an external signal.
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.
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.
This metal parts connects the piping of the supply/return units.
A phenomenon that may occur in a fluid moving at high speed. In the parts of the
fluid where the pressure is low, vapour bubbles form and then rapidly collapse. If
cavitation is present for a prolonged period, exposed surfaces will be damaged; this
is called cavitation damage or erosion.
The problem of the switch output turning ON and OFF repeatedly around the set
value at high frequency due to the effect of pulsation.
The time from when the flow rate applied to the flow switch reaches the set value, to
when the ON-OFF output actually begins working. Setting the Delay time can
prevent the output from chattering.
The time indicates when the set value is 90% in relation to the step input.
Function to add digital filtering to the fluctuation of flow rate value. Smooth the
fluctuation of displayed value for sharp start up or fall of the flow rate.
When the function is valid, digital filtering is reflected to the ON/OF F of the switch
output.
Output chattering or flicker in the measurement mode display can be reduced by
setting the digital filter.
The range of measured values that can be displayed for a product with a digital
display.
This indicator visually detects the flow condition. The higher the flow rate, the
faster the flashing speed. (This might display errors.)
Range of fluid temp. that can be measured by the product.
Stands for "full span" or "full scale", and indicates varied display value and 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])
A function to store the accumulated flow value in the product's internal memory. The
flow value will be stored at a set time interval of either 2 or 5 minutes. When the
power supply is turned on, the stored accumulated flow value will be displayed and
accumulated flow will continue from that point.
The difference between ON and OFF points used to prevent chattering. Hysteresis
can be effective in avoiding the effects of pulsation.
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 (set value – hysteresis value).
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.
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.
-21-
Meaning
No.PF※※-OMW0004-A