Meter Features

Gas meters include safety features that monitor gas usage.

Roles of gas meters

  • Gas meters not only track how much gas you are using, they also have 24-hour gas usage monitoring, leading to the name “microcomputer meter.”
  • Gas meters include safety features similar to those of electric breakers.
  • Gas meters can detect and automatically shut off the gas when it appears to be left on by accident, leaking or being used in some other irregular way, or during a disaster such as an earthquake (around magnitude 5 or greater).

Main safety features of gas meters

Regular “microcomputer meters”

Gas meters (microcomputer meters) detect, automatically shut off the gas and warn with a blinking light (or otherwise) when one of the following occurs.

  • When more gas is flowing through than has been prescribed for the meter size
  • When a certain amount of gas has flowed for longer than the prescribed length of time (home gas meters and some industrial meters)
  • When an earthquake magnitude 5 or greater is detected (for meters size 10 or higher, only when the gas is flowing)
  • When the gas pressure drops below the prescribed level (only when the gas is flowing)
  • When an alarm or incomplete combustion sensor goes off (only if it is linked to the meter)

Warning feature

Gas meters give a warning when the following occurs (some have a light that comes on while others display it on the LCD screen.

  • When gas flow is detected for 30 consecutive days (although a warning may not be given if the amount is less than what the microcomputer meter can detect)

*This may not prevent all gas leaks, oil fires, exhaust gas poisoning or other incidents.

Types of gas meters

Regular microcomputer meter

These are the meters used extensively in homes.

NB/JB/KB/LB/AB gas meters
NB/JB/KB/LB/AB gas meters

Microcomputer meter with transmission capabilities

These meters have transmission capabilities and are mainly installed in the homes of customers using our My Alert service.

  • NI meters
    NI meters
  • JO meters
    JO meters
  • UH meters
    UH meters

Business-use microcomputer meter

  • Type NB/NS (10 and 16)
    Type NB/NS (10 and 16)
  • Type NS (25 to 120)
    Type NS (25 to 120)

Main gas meter locations

Home gas meters

  • Inside the meter box
    Inside the meter box next to the front door or found in the common hallway
  • Outside in a row
    Outside in a row (with apartment number stickers)
  • on an outer wall
    Outside/near the front door on an outer wall

Business-use gas meters

  • Vicinity of GHP
    Vicinity of GHP: around the GHP on the roof
  • Schools, etc.
    Schools, etc.: outside cafeterias and kitchens, indoors
  • Buildings
    Buildings: outdoors and meter rooms

Gas meter replacement

Gas meters have a prescribed effective period based on their method of measurement and therefore need to be replaced periodically. Replacement is free.

Gas meter replacement timing

Home gas meters must be replaced once every ten years while industrial gas meters must be replaced once every seven years. We will send a postcard notifying you one month before a scheduled replacement. Depending on where the meter is located, it may or may not be able to be done while you are not at home. About one week before replacement, a company designated by Tokyo Gas will send you a paper specifying the replacement date and whether or not you need to be present.


Example of a notification postcard

Gas meter replacement work

On the day of the replacement, an employee of one of our contractors will visit you.

They will have identification clipped to their breast pocket or elsewhere certifying that they have been contracted by Tokyo Gas to replace gas meters. Replacement should take around 40 minutes.

When you wish to change the replacement date

Please contact the contractor listed on the notification or the Tokyo Gas Customer Center. Please be prepared to provide the following when you call.

  • The name of the applicant (your name)
  • The name of the registered user
  • The address at which the gas is being used
  • The telephone number of the above address
  • Your customer number (written on the notification as well as your usage statements. See here for how to find the number on your statements)
  • A telephone number at which you can be reached (cell phone, etc.)
  • Preferred date and time of your gas meter replacement work
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