Fire Fighting Enterprises Vibration Switch: Weatherproof - Manual (Page 7)

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The vibration switch is factory set accurately to 3 g. The SET LEVEL can be estimated by
referring to the calibration curve in figure 6 and counting the number of turns from the factory
setting.
If the factory setting is lost, it can be approximated as 11.5 turns from flush.
Figure 6: Vibration Switch Calibration Curve.
FLUSH