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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
Section 2 System Components and Description
2.5.2 Discharge Pressure Switch
P/N 97428 (See Figure 2.5.2)
A discharge pressure switch is used in the system to send a signal confirming
agent discharge to the control panel or to initiate the shut down of
equipment that may deplete agent concentration. It is a single pole, double
throw (SPDT) switch with contacts rated 15 Amps at 125/250/480 VAC
and 0.5 Amps at 125 VDC. It has a NEMA 4X enclosure. e discharge
pressure switch shall be required where mechanical system actuation is
possible, though its placement varies according to the individual system
arrangement. (Refer to Section 4.1.5 for installation.)
2.5.2.1 Explosion-Proof Discharge Pressure Switch, Self-Restoring
P/N 97430 (See Figure 2.5.2.1)
A self-restoring NEMA 4X, 7, 9 and IP 67 Explosion-Proof Discharge Pressure
Switch can be used in potentially explosive atmospheres to send indication of
agent discharge to a releasing panel and/or initiate the shut down of equipment
that may deplete agent concentration. It is a self-restoring double pole, double
throw (DPDT) switch with contacts rated 5 Amps at 125/250 VAC and 28
VDC resistive. It is factory set at 50 psig (3.44 bar) rise. (Refer to Section 4.1.5
for installation.)
Explosion-Proof Ratings:
Class I Div 1 Groups A, B, C, & D
Class II Div 1 Groups E, F, & G
T5 or T6
II 2GD
Ex d IIC T6/T5 Gb
Ex tb IIIC T85°C/100°C Db
Figure 2.5.2.1 Explosion-Proof
Discharge Pressure Switch,
Self Restoring
1/2” (15 mm) MNPT
Conduit Connection
72” (1829 mm)
Leads
1/4” (8 mm) MNPT
Process Connection
Figure 2.5.2 Weather-Proof
Discharge Pressure Switch,
Manual Reset
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