3.8 Pressure Switch (400001)
3.8.1 Valve Mounted Pressure Switch (940205-PS 940555-PS 941055-PS 942055-PS)
The valve mounted pressure switch is an optional part of the unit assembly. It is factory installed into the pressure switch port of the cylinder valve.
The valve mounted pressure switch is used to monitor unit pressure, unit actuation, or it can be used to energize or de-energize electrically operated
equipment. If the unit to which the pressure switch is attached to loses pressure and reaches a pressure of 135 ± 10 psig [9.3 ± 0.7 bar] or below,
the switch contacts will operate. Refer to Figure 9 – Valve Mounted Pressure Switch, Table 13 – Valve Mounted Pressure Switch Part Number,
Figure 10 –Pressure Switch Wiring Schematic, and Table 14 – Pressure Switch Properties for additional information.
The pressure switch is single pole, double throw (SPDT) and can be wired in either the normally open (NO), normally closed (NC) configurations,
where the normal condition is at atmospheric pressure. When the unit is pressurized, the contacts switch over.
When the pressure switch is used on a standard supervisory input circuit, there will be no distinction between a wiring fault and device actuation. The
pressure switch shall be installed onto a circuit suitable for unit supervision in accordance with NFPA 70 National Electric Code and NFPA 72
National Fire Alarm and Signaling Code.
This device is only to be utilized when accepted by the authority having jurisdiction. All other uses of this switch should be approved by the authority
having jurisdiction.
NOTE: All detection devices and auxiliary alarm and control devices must be electrically compatible with each other. They must be approved by the
authority having jurisdiction.
NOTE: Firetrace recommends that all units be equipped with a pressure switch and connected into a notification or shutdown device, in the event of a
discharge.
CAUTION
Never use the pressure switch as a handle to transport the unit.
Figure 9 – Valve Mounted Pressure Switch
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