Definition And Terminology - SMC Networks PF3W3 Series Operation Manual

■Definition and terminology

Terms
A
Accumulated flow
Accumulated flow
external reset
Accumulated pulse
output
Analogue output
C
Chattering
Copy function
D Display flow range
F Fluid temperature
F.S.
(Full span, Full scale)
H
Holding of
accumulated flow
Hysteresis
Hysteresis mode
I
Instantaneous flow
Internal voltage drop
K Key-lock function
M
Min. setting unit
O Operating temp. range
P
Power saving mode
R
Repeatability
Response time
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.
The problem of the switch output turning ON and OFF repeatedly around the set value
at high frequency due to the effect of pulsation.
A function to copy flow rate setting values and function settings (excluding fine
adjustment of indication value).
The range of measured values that can be displayed for a product with a digital display.
Range of fluid temperature that can be measured by the product.
Stands for "full span" or "full scale", and indicates varied display valve 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.
This function prevents the set value from being changed by mishandling.
The resolution of set and display values. If the min. setting unit is 1 L/min, the display
will change in 1 L/min steps, e.g. 10.....11.....12 L/min.
Ambient temperature range in which product is operable.
The condition in which the digital display turns off and the current consumption is
reduced.
Reproducibility of the display or analogue output value, when the measured quantity is
repeatedly increased and decreased.
Time from when the target flow is applied until the flow reaches 90% of the set value.
-14-
Meaning
No.PF※※-OMN0012-I