Riken Keiki GD-3EC, Technical Manual

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7. Maintenance 7-2 Maintenance mode
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4 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 maintenance mode, the
product will take 10 hours to return to detection mode. Detection will not be available during this time,
posing hazards.
NOTE

If the password setting is enabled, the password must be entered to access maintenance mode.
 The password is set in advance by Riken Keiki.
If you are unsure, contact Riken Keiki.
<Switching from maintenance mode to user mode>
1 Press the ▲ or ▼ key in maintenance mode several times
to select [2-9], then press the SET key.
2 Press the SET key.
The product switches to user mode.