SMC Networks LFE series - Definition and Terminology

-14-
No.LFE****-OMZ0012
■Definition and terminology
Term
Meaning
A
Analogue output
Outputs a value proportional to the flow rate. When the analogue output is in the range 1
to 5V, it will vary between 1 to 5V according to the rate of flow.
The same for analogue output of 4 to -20 mA.
Applicable fluids
The fluid(s) that the product can measure.
Attachment
The metal part of both sides of the product to which piping is connected.
C
Cavitation
A phenomenon that may occur in a fluid moving at high speed. In the parts of the fluid
where the pressure is low, vapor bubbles form and then rapidly collapse.
E
Electric conductivity
The electric conductivity is a ratio which shows how easily the electricity flows. The unit
is [S/cm] (siemens/centimeter).
The lower the electric conductivity, the more difficult the electricity flows in the fluid.
On the contrary, the higher the electric conductivity, the easier the electricity flows in the
fluid.Conductivity of tap water is 100 to 200μS/cm.
F
F.S. (full span /
full scale)
This means "full span" or "full scale", and indicates maximum variation width 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])
Fluid contact part
A part that comes into physical contact with the fluid.
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
Voltage reduction across an internal device when the switch output is in the ON
condition.
O
Operating fluid
temperature
Range of fluid temperature that can be used by the product.
Operating pressure
range
The pressure range in which the product can be used.
Operating
temperature range
Ambient temperature range in which the product can operate.
P
Pressure
characteristics
Indicates the change in the display value and analogue output when fluid pressure
changes.
Proof pressure
Pressure limit that if exceeded will result in mechanical and/or electrical damage to the
product.
R
Rated flow range
The flow range within which the product will meet all published specifications.
Rated pressure range
The pressure range that satisfies the specifications.
Repeatability
Reproducibility of the display or analogue output value, when the measured quantity is
repeatedly increased and decreased.
Response time
The delay time until the set value reaches 63% in relation to the step input.
T
Temperature
characteristics
Indicates the change in the display value and analogue output caused by ambient
temperature or fluid temperature changes.
W
Water hammer
Water hammer or impact pressure is a pressure surge due to pressure spread when a
fluid in motion is forced to stop or change direction when equipment such as valve, is
opened/closed.