The Secoh BJD Series A1 - A2 - A3 - A3 - A4 - A5 - A6 - A6 - A6 - A7 alarm boxes are used to inform the user of changes in air pressure. When the configuring of the alarm box, an air pressure threshold is defined (low and high). Outside these operating ranges, the alarm light illuminates and warns the user of a decrease or an increase in air pressure. These models are available for an air flow rate below 70 l/min and above 300 l/min.

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