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6. FUNCTION AND DATA SETTINGS
IM 1E7B0-02E
6-1
6.
FUNCTION AND DATA SETTINGS
A Magnetic flowmeter calculates volume flow rate from a minute voltage that corre-
sponds to the flow velocity of a fluid and outputs as a 4 to 20mA signal.
The three parameters must be set to obtain a correct signal.
Nominal size, flow span and meter factor must be set.
In these three factors, Nominal size (unit:mm) and meter factor are set before
shipment.
This chapter explaines how to set flow span, other functions and data settings.
Please set data correctly.
6.1 Setting Flow Span
(1) Determing the Flow Span
The flow rate span is the instantaneous flow rate value at which the output current is to
be 20mA.
Please determine the span under considering the followings.
•
Please set the maximum flow rate at the most variable flow rate line.
If the flow rate of the fluid exceeds the flow rate span value, the flow rate that
exceeds this value (20mA or more) is not output and the flowmeter will not display
the correct flow rate. (108% or more can't be output)
•
In a line where the flow rate is comparatively stable, set a value that is 1.5 to 2.0
times larger than the normal flow rate.
•
Please set a value that will correspond to a flow velocity of 0.3 to 10m/s.
Please comfirm the flow velocity by sizing data or parameter No. “ 13”.
(Parameter No. “ 13” indicates corresponding flow velocity to set span)
•
The basic input value for display is flow span value. It is recommended that the
accuracy of the first digit is in a 0.05 to 0.1% in case inputting the flow rate span
value.
For example, 30m
3
/h should be set as 30.00m
3
/h.
•
In a span setting, the maximum value that can set is “30000” except any relation
with decimal position.
Basic Key Operations
Key Operation
Item
SET
SHIFT
SET
SHIFT
INC
SET (Twice)
How to change the display into the setting mode?
How to move the cursor on the display during parameter setting?
How to change the display into the data changing mode?
How to move the cursor in the data changing mode?
How to change the data?
How to input the set data?
NOTE
NOTE
You cannot set the leftmost digit of display to numeric value
greater than "4". If the leftmost digit of the span must be "4"
or more, set the numeric value beginning from the digit
second from the left on the display (the fourth digit). If the
leftmost digit of the display is set to "3", the digits to its right
can be set to "0" only, regardless of the decimal point
position.
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