Citizen BN7, Instruction Manual

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Features
Water resistant construction capable of withstanding a depth of 1,000 m (water pressure
equivalent to 100 atm)
• This watch features enhanced water resistance that enables it to withstand saturation
diving using helium gas.
Equipped with a helium escape valve for discharging helium gas
• In saturation diving, when decompressing to surface pressure in a diver decompression
chamber, the helium escape valve in the watch automatically discharges the helium gas
that has seeped into the watch to improve safety.
Rotating bezel with reverse rotation prevention mechanism to prevent incorrect operation
• The rotating bezel, which is important for checking diving time, employs a reverse
rotation prevention mechanism that prevents the rotating bezel from being rotated
inadvertently.
Request to customers
All parts of this watch, except for the band, are to be repaired only at CITIZEN.
This is because special technologies and equipment are required to perform repairs,
inspections and adjustments. Please make requests for repairs to an authorized service
center when having your watch repaired.