The Neptune® HP PROTECTUS® III Stainless Steel (S) fire service meter measures extremely wide flow ranges at 100% ± 1.5% accuracy. All HP fire service meters meet or exceed AWWA C703 Standard, are certified to NSF/ANSI 61 and 372 requirements, and are Underwriters Laboratory (UL) Listed and Factory Manual (FM) Approved for fire service use.
The HP PROTECTUS III S fire service meter is designed to measure both domestic and fire service water usage
through a single water line. A typical application would be in a warehouse, hotel, or hospital where one water
line may supply any number of faucets or bathrooms as well as an automatic sprinkler system.
At low f low rates, all f low is through the bypass meter. As f low increases, pressure loss through the
bypass meter increases and the detector check valve automatically opens. This condition occurs, for example,
when a fire sprinkler system goes into operation. This permits f low through the mainline turbine meter. As f
low decreases, reduced pressure loss closes the detector check valve and f low is again directed through the
The combined readings of the mainline turbine and the bypass meter indicate total consumption through the HP PROTECTUS III S meter.