Riken Keiki GD-3EC, Техническое руководство

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6. Alarm Activation 6-4 External output operation
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<Gas concentration and external output example (with double range)>
Two display ranges (L range and H range) are provided when using a new ceramic type sensor.
The display automatically switches to the H range if the combustible gas concentration reading exceeds the full
scale of the L range. The range also automatically switches back to the L range when the gas concentration
drops below the full scale of the L range.
For example, when the target gas is isobutane, readings between 0 and 2,000 ppm appear in the L range and
the display switches to the H range for readings between 12.0 and 100.0 %LEL.
<4 - 16 mA (L range)/16 - 20 mA (H range) setting>
<4 - 20 mA (L range)/22 mA (H range) setting>
NC
External output
20.5 mA
20 mA
Gas concentration
Full scale
20 mA output
0
16 mA
4 mA
2.5 mA
H range
Full scale over
20.5 mA fixed output
Detection mode
Maintenance mode
External output
20.5 mA
20 mA
4 mA
2.5 mA
0
Full scale
20 mA output
Gas concentration
L range
H range
20.5 mA fixed output
Detection mode
Maintenance mode
Zero suppression
Zero suppression