Riken Keiki GD-3EC, Technical Manual

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6. Alarm Activation 6-4 External output operation
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<Gas concentration and external output example (with standard range)>
<4 - 20 mA specification (maintenance output: 2.5 mA setting)>
CAUTION

The 4 - 20 mA output is already adjusted. When the full scale is exceeded, the output will not exceed
approximately 20.5 mA.

If the inhibit function is enabled or initialization is underway, the output follows the 4 - 20 mA output setting
in maintenance mode. Special care is required when starting the product or after altering specifications.

Make sure you fully understand the operation details. Take appropriate precautions where necessary to
prevent false alarms on the receiving side.

When the suppression function is canceled, the signal will be linearly output to 4 mA (equivalent to
0 %LEL).

When the minus suppression function is canceled, the signal will be linearly output to 3.2 mA (equivalent
to −5 %LEL).
Detection mode
Maintenance mode
External output
20.5 mA
20 mA
4 mA
2.5 mA
0
Full scale
20 mA output
Gas concentration
Zero suppression
Full scale over
20.5 mA fixed output