What information must be shown on the nameplate affixed to the front of a vapor meter?

The nameplate affixed to the front of a vapor meter serves an important purpose in identifying essential details about the device. It must include key information that provides clarity regarding the meter's specifications and allows for proper identification and maintenance.

The inclusion of the manufacturer's name ensures that users can identify the origin of the meter and access support or replacements if needed. The serial number is crucial for tracking individual units, particularly for warranty purposes and in the event of recalls. The model number is akin to a fingerprint for specific designs, allowing for uniformity in replacement parts or upgrades. Finally, the capacity rating informs users about the meter's operational limits, ensuring that it is suitable for the intended application.

Having all this information readily available on the nameplate ensures that operators and maintenance personnel can quickly and accurately ascertain the necessary details about the vapor meter, supporting safe and effective operation. Other answer choices do not provide the comprehensive information required on the nameplate.