Emerson 2200S 사용자 설명서
Configuration and Use Manual
35
Configuring Process Measurement
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Example 2
Configuration:
•
Flow direction = Reverse Only
•
mA output: LRV = 0 g/s; URV = 100 g/s
(See the second graph in Figure 4-1.)
As a result:
•
Under conditions of forward flow or zero flow, the mA output of the
transmitter is 12 mA.
transmitter is 12 mA.
•
Under conditions of reverse flow, up to a flow rate of 100 g/s, the
mA output of the transmitter varies between 12 mA and 20 mA in
proportion to the absolute value of the flow rate.
mA output of the transmitter varies between 12 mA and 20 mA in
proportion to the absolute value of the flow rate.
•
Under conditions of reverse flow, if the absolute value of the flow
rate equals or exceeds 100 g/s, the mA output of the transmitter
will be proportional to the absolute value of the flow rate up to 20.5
mA, and will be level at 20.5 mA at higher absolute values.
rate equals or exceeds 100 g/s, the mA output of the transmitter
will be proportional to the absolute value of the flow rate up to 20.5
mA, and will be level at 20.5 mA at higher absolute values.
Example 3
Configuration:
•
Flow direction = Forward Only
•
mA output: LRV = –100 g/s; URV = 100 g/s
(See the first graph in Figure 4-2.)
As a result:
•
Under conditions of zero flow, the mA output is 12 mA (before
respanning).
respanning).
•
Under conditions of forward flow, up to a flow rate of 100 g/s, the
mA output of the transmitter varies between 12 mA and 20 mA in
proportion to (the absolute value of) the flow rate.
mA output of the transmitter varies between 12 mA and 20 mA in
proportion to (the absolute value of) the flow rate.
•
Under conditions of forward flow, if (the absolute value of) the flow
rate equals or exceeds 100 g/s, the mA output of the transmitter is
proportional to the flow rate up to 20.5 mA, and will be level at
20.5 mA at higher flow rates.
rate equals or exceeds 100 g/s, the mA output of the transmitter is
proportional to the flow rate up to 20.5 mA, and will be level at
20.5 mA at higher flow rates.
•
Under conditions of reverse flow, up to a flow rate of 100 g/s, the
mA output of the transmitter varies between 12 mA and 16 mA in
inverse proportion to the absolute value of the flow rate.
mA output of the transmitter varies between 12 mA and 16 mA in
inverse proportion to the absolute value of the flow rate.
•
Under conditions of reverse flow, if the absolute value of the flow
rate equals or exceeds 100 g/s, the mA output of the transmitter is
inversely proportional to the flow rate down to 11.9 mA (3.8 mA if
level-shifted), and will be level at 11.9 mA (3.8 mA) at higher
absolute values.
rate equals or exceeds 100 g/s, the mA output of the transmitter is
inversely proportional to the flow rate down to 11.9 mA (3.8 mA if
level-shifted), and will be level at 11.9 mA (3.8 mA) at higher
absolute values.