100 PSI Water Gauge (Universal Replacement)

This 100 PSI water pressure gauge is a universal replacement gauge for fire suppression and sprinkler system applications where the operating pressure range falls within 100 PSI. A 100 PSI range gauge is appropriate for lower-pressure water supply systems, gravity-fed systems, specific pump-discharge monitoring, or any suppression system application where the expected operating pressure is well below the 300 PSI rating of a standard sprinkler riser gauge. Using a gauge with the correct range for a given application provides better resolution and readability at normal operating pressure than a higher-range gauge would.

As with any gauge installed on a fire protection system, confirm that the replacement gauge carries the listings required by the applicable installation standard for the specific system it will serve before installation.

• Verify Required Listings: Gauges installed on automatic sprinkler systems are required by NFPA 13 to be UL listed and FM approved. Confirm the specific listing requirements for the system and jurisdiction before installing a replacement gauge.
• Correct Range for Application: The 100 PSI range is suited to lower-pressure systems where operating pressure will not approach the gauge's maximum. For standard wet-pipe sprinkler risers where supply pressure may range from 50 to 175 PSI or higher, the 0-300 PSI gauge is typically the correct choice.
• 5-Year Calibration: NFPA 25 requires sprinkler system gauges to be replaced or calibration-tested every 5 years.
• Replace When Damaged: Replace the gauge immediately if the needle sticks, reads erratically, or the lens is cracked or fogged.

When should I use a 100 PSI gauge instead of a 300 PSI gauge?

A 100 PSI gauge provides better dial resolution and easier reading when the system's normal operating pressure is in the 30 to 80 PSI range, where a 300 PSI gauge would show the needle in the lower third of the dial. Use the 100 PSI range where supply pressure will reliably remain well below 100 PSI. If there is any chance of pressure spikes or surges approaching 100 PSI, the 300 PSI gauge is the safer choice to avoid over-ranging.

Does this gauge work on dry-pipe sprinkler systems as well as wet-pipe?

Yes, provided the operating pressure on the specific connection point falls within the gauge's 100 PSI range. Dry-pipe system gauges must also meet listing requirements for the application, so confirm the gauge's certifications match what is required for your specific system.