-12-
No.PF
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-OMS0002-B
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Definition and terminology
Terminology
Definition
A
Accumulated flow
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 5 x 10 = 50 L.
Accumulated flow external
reset
A function to reset the accumulated flow to "0" when an external signal is input.
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
A function to store the accumulated flow value in the 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.
Analogue output
A type of variable output that has a value proportional to the measured quantity.
When the analogue output is in the range of 1 to 5 V or 4 to 20 mA, it will vary
continuously, following the change of flow.
C
Chattering
The problem of the switch output turning ON and OFF repeatedly around the set
value at high frequency due to the effect of pulsation.
D
Display flow range
The range which can be displayed by the product with a digital display.
F
F.S. (Full span, Full scale)
Stands for "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],
(ref. 1%F.S. = 4[V] x 1% = 0.04[V])
The maximum measuring range or change in analogue output over the maximum
measurement range.
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 volume of flow 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.
K
Key-lock function
A function that locks the set buttons so that no accidental setting changes can be
made.
