Tokyo Keiki UFL-30, Руководство по установке и эксплуатации

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II-7
Analog output (4-20mA current output)
This function converts the flow measurement range setting (zero to max. setting value) into a 4
～
20mA
current output. Two output channels and 8 output patterns are provided.
• Each channel is insulated which allows current output reception from two separate locations.
• Output patterns are configured from 3 components: system, direction, and range.
Analog output operation can be set in the case of measurement aberrations (i.e. no received signal,
equipment failure). Please refer to Fig. 4-4, Transition Diagram During Measurement Aberrations
under Chapter II-2-7 ‘Output Operation During Aberrations in Measurement’ for the condition of the LCD
display, relay output, and output relative to analog output operation.
[System]
When 1 system output is selected, the same output from channels 1 and 2 will be obtained. As
each channel is insulated, signal reception can be obtained from two locations.
When 2 system output is selected, the receiving signal is a combination of channels 1 and 2 and by
adding this to flow volume, you can determine flow direction and range. This function is handy
when you cannot use a relay output.
[Direction]
Selecting direction 1 allows measurement in the forward flow direction only.
Selecting direction 2 allows measurement in both the forward and reverse flow directions.
[Range]
Select single range to set 1 measurement range for 1 flow direction.
Select double range to set 2 measurement ranges (low range and high range) for 1 flow direction.
When flow is bi-directional, setting 2 ranges enables highest resolution for low flow volume
independent of the high flow volume setting.
Range switching can be done automatically in accordance with the measurement value.
[Output profiles]
1. 1: +:SNGL (1 system, 1 direction single range output)
Measures forward direction flow only. Same current values are output from channels 1 and 2.
One range.
Graph of flow relative to output current is shown below.
正流
０
低ﾚﾝｼﾞ
高ﾚﾝｼﾞ
20mA
4mA
Forward
Low
High
Note: When single range is selected, it is treated as high range.