Riken Keiki GD-3EC, Technical Manual

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5. Usage Instructions 5-5 User mode
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5-5-2 Switching to user mode
1 Hold down the MENU/ESC key (for approximately three
seconds) in detection mode.
The product switches to user mode.
2 Press the ▲ or ▼ key to select the required item
number, then press the SET key.
The details corresponding to the item number selected are displayed.
Set or display individual items.
3 Once the operation is complete, hold down the MENU/ESC key (for approximately three seconds).
The product switches to detection mode.
WARNING

Once the operation is complete, be sure to hold down the MENU/ESC key to return to detection mode.
The product will not detect gases while in adjustment/setting state. If left in user mode, the product will
take 10 hours to return to detection mode. Detection will not be available during this time, posing
hazards.
Display example: With setting
display selected