-14-
No.LV50***-OMQ0004-B
■
Definition and terminology
Term
Meaning
Ambient temperature
range
Ambient temperature range in which the product can operate.
Analogue output
Outputs a value proportional to the flow rate. When the analog 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.
A
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.
If cavitation is present for a prolonged period, exposed surfaces will be damaged; this is
called cavitation damage or, erosion.
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. The minimum electrical conductivity for fluids for this sensor is 5uS/cm.
Conductivity of tap water is 100 to 200
μ
S/cm.
F
F.S.(full span/full
scale)
This means "full span" or "full scale", and indicates varied analog output range at rated
value.For example, when analog output is 1 to 5 V, F.S.=5[V] – 1[V]=4[V].
(Reference: 1%F.S. = 4[V] × 1% = 0.04[V])
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.
M
Measured fluid
The fluid(s) that the product can measure.
Operating fluid
temperature
Range of fluid temperature that can be measured by the product.
O
Operating pressure
range
The pressure range in which the product can be used.
Part in contact with
fluid (wetted part)
A part that comes into physical contact with the fluid.
P
Pressure
characteristics
Indicates the change in the display value and analog output when fluid pressure
changes.
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 analog output value, when the measured quantity is
repeatedly increased and decreased.
R
Response time
Time from when the target flow is applied until the flow reaches 63% of the set value.
T
Temperature
characteristics
Indicates the change in the display value and analogue output caused by ambient
temperature or fluid temperature changes.
Water hammer
A momentary steep pressure increase due the spread of pressure by closing a contactor
such as a vlave for an extremely short time while there is a flow.
This pressure increase is known as water hammer or impact pressure.
W
Withstand pressure
Burst pressure at which the product is electrically or mechanically damaged.
