Riken Keiki GD-3EC, Technical Manual

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6. Alarm Activation 6-5 Functions to ensure correct alarm activation
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6-5-2 Automatic sensor recognition function
This product features a function that automatically recognizes the sensor after a sensor is replaced or
specifications have been changed.
The display appears as follows to prevent incorrect mounting if a sensor with a different serial number, detection
principle, or specifications is mounted:
<After sensor replacement>
The display appears as follows when the sensor has been replaced with a sensor of the same specifications (e.g.,
detection principle and model)—for example at periodic replacement.
Pressing the MENU/ESC key makes the product recognize the sensor as a new sensor and start up.
If the sensor mounted after replacement has the same or an older manufacturing date than the sensor replaced,
the display alternates between [C-01] and [USEd], as follows.
An old sensor may have been mounted by mistake. Check the sensor.
<After changing specifications>
The display appears as follows when the sensor has been replaced with a sensor of different specifications (e.g.,
detection principle and model).
Pressing the MENU/ESC key makes the product recognize the sensor as a sensor with new specifications and
start up.
If you did not intend to change the specifications, the sensor may have been mounted by mistake. Check the
sensor.
CAUTION

Confirming changes in sensor specifications (e.g., detection principal, sensor type, detection target gas,
and detection range) when [C-02] is displayed will reflect the changes in the specifications of the product
as gas detector.
The following parameters will be reset to their initial values in addition to the alarm setpoints.
Change the parameters in maintenance mode if values other than the initial values are required.
・
Alarm delay
・
Zero suppression value
・
Alarm type

Confirming the changes by pressing the MENU/ESC key when [C-02] is displayed will start initialization
and switch the operation. The initialization output will also change at the same time.

Settings such as external output are maintained at their previous settings in maintenance mode.
Particular care is required here.

The ESF specifications include three different alarm types: L-LL, L-H, and H-HH.
The alarm directions will be reversed for changes from or to ESF (L-LL alarm).