About Sound Levels
To choose an alarm or speaker that’s loud enough, first determine the decibel (dB) rating of background noise.
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Long-Distance Whistles
Apply air or steam pressure to produce a shrill tone and alert workers. Signal continues as long as pressure is applied.
| Volume | Environment | Sound Pattern | Dia. | Ht. | Material | Air Consumption | Operating Pressure | Max. Input Pressure | Conduit Size  | Thread Type | Gender | Each | |
Air or Steam Powered | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 132 dBA @ 1 m | Outdoor | Continuous | 1" | 4 1/2" | Brass/Bronze | 0.9 cfs @ 100 psi | 50-200 psi | 200 psi @ 550° F | 1/4 | NPT | Female | 0000000 | 0000000 |
| 132 dBA @ 1 m | Outdoor | Continuous | 3" | 13" | Brass/Bronze | 4.6 cfs @ 100 psi | 50-200 psi | 200 psi @ 550° F | 3/4 | NPT | Female | 0000000 | 000000 |
| 124 dBA @ 1 m | Outdoor | Continuous | 1 1/2" | 9" | Brass/Bronze | 1.4 cfs @ 100 psi | 50-200 psi | 200 psi @ 550° F | 3/8 | NPT | Female | 0000000 | 000000 |
| 142 dBA @ 1 m | Outdoor | Continuous | 6" | 25" | Brass/Bronze/Stainless Steel | 14 cfs @ 100 psi | 50-200 psi | 200 psi @ 550° F | 1 1/2 | NPT | Female | 0000000 | 00000000 |
| 122 dBA @ 1 m | Outdoor | Continuous | 2" | 11 1/4" | Brass/Bronze | 3.7 cfs @ 100 psi | 50-200 psi | 200 psi @ 550° F | 1/2 | NPT | Female | 0000000 | 000000 |
Long-Distance Whistles with Valve
The quick-opening valve on these whistles allows manual operation—pull the valve while air or steam pressure is being applied to produce a shrill tone and alert workers. The valve has a hole for attaching chain.
| Volume | Environment | Sound Pattern | Dia. | Ht. | Material | Air Consumption | Operating Pressure | Max. Input Pressure | Conduit Size | Thread Type | Gender | Each | |
Steam Powered | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 132 dBA @ 1 m | Outdoor | Continuous | 1" | 7" | Brass/Bronze | 0.9 cfs @ 100 psi | 50-200 psi | 200 psi @ 550° F | 1/4 | NPT | Female | 0000000 | 0000000 |
| 132 dBA @ 1 m | Outdoor | Continuous | 3" | 17 3/4" | Brass/Bronze | 4.6 cfs @ 100 psi | 50-200 psi | 200 psi @ 550° F | 3/4 | NPT | Female | 0000000 | 000000 |