-14-
No.PF
※※
-OMX0002
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Definition and terminology
Term
Definition
A
Accumulated flow
The total amount of fluid that has passed through the device. If an
instantaneous flow of 100 L/min lasts for 5 minutes, the accumulated flow will
be 5 x 100 = 500 L.
Accumulated flow external
reset
A function to reset the accumulated value to "0" when an external input signal
is applied.
Accumulated pulse output
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.
Accumulated-value hold time
A function to store the cumulative flow value in the product's internal memory
at certain time intervals. Reads the memory data when power is supplied.
Accumulation of data begins with the value read at the moment power is
supplied. The time interval for memorizing can be selected from 2 or 5
minutes.
Analogue output
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 0 to 10 V or 4 to 20 mA.
D
Delay time
The setting time from when the flow applied to the flow switch reaches the set
value, to when the ON-OFF output actually begins working.
Delay time setting can prevent the output from chattering.
The response time indicates when the set value is 90% in relation to the step
input.
Display range
Displayable range of flow.
Digital filter
Function to add digital filtering to the fluctuation of flow value. Smooth the
fluctuation of displayed value for sharp start up or fall of the flow.
When the function is valid, digital filtering is reflected to the ON/OFF of the
switch output and analogue output. The response time indicates when the set
value is 90% in relation to the step input.
Output chattering or flicker in the measurement mode display can be reduced
by setting the digital filter.
F
F.S.
(full span/ full scale)
This means "full span" or "full scale", and indicates varied analogue output
range at rated value. For example, when analogue output is 1 to 5 V,
F.S. = 5 [V]
– 1 [V] = 4 [V]. (Reference: 1%F.S. = 4 [V] × 1% = 0.04 [V])
H
Hysteresis
The difference between ON and OFF points used to prevent chattering.
Hysteresis can be effective in avoiding the effects of pulsation.
Hysteresis mode
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.
I
Instantaneous flow
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.
Internal voltage drop
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.
