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D200-13-00

1

I56-0305-010R

PA400*, PS12LO, PS12M,

PS24LO*, and PS24M* 

Electronic Mini-Sounders and 

Optional Strobes

*ULC models add suffix “A”; available in 24VDC only. Add suffix “R” for red models; “W” for 
white models; “B” for Beige model. PA400, add suffix “F” to models with fire printed on front.

INSTALLATION AND MAINTENANCE INSTRUCTIONS

A Division of Pittway

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

The Products to which this manual applies may

be covered by one or more of the following 

U.S. Patent numbers: 5,546,293 and 5,488,462

General Information

The National Fire Protection Association has published codes,
standards, and recommended practices for the installation and
use of the above appliances. Therefore, the installer must be
familiar with these requirements, with local codes, and any spe-
cial requirements of the authority having jurisdiction.

Model PA400

The PA400W (white), PA400R (red), and PA400B (beige) Piezo
Alert electronic sounder and optional supplementary signal
strobes are intended to be connected to the alarm indicating cir-
cuit of a UL-listed 12 or 24 VDC fire alarm control panel. The
models PS12 and PS24 optional strobe additions to the PA400

Specifications

PA400 Sounder

Operating Voltage:

9.6VDC (absolute min.) to 33VDC (absolute max.)

Current Drain:

12  mA at 12 volts
15 mA at 24 volts

Temperature Range:

–10°C to +60°C (14°F to 140°F)
0°C to 49°C  (32°F to 120°F) with strobe added

Sound Output:

Greater than 90 dBA measured in anechoic room at 10 feet, 24 volts.
See Figure 1 for other voltages. 82 dBA minimum measured in  UL  reverbarant  room 
(75 dBA minimum with strobe)

PS12/24 Strobe

Figure 3. 12 volt strobe in-rush current:

1A/div

200µS/div

1A/div

200µS/div

Figure 4. 24 volt strobe  in-rush current:

Figure 1:

Figure 2:

require a 12 VDC or 24 VDC panel, respectively and are able to
operate from a full-wave rectified, unfiltered supply.

Installation Notes

The wiring must be in compliance with all codes and must not be
of such length or wire size that would cause the appliance to
operate outside of its published specifications. The appliances
must also be tested after installation in accordance with the con-
trol panel manufacturer’s test procedure.

NOTE

: Do not loop wires under terminal screws. Wires connect-

ing the device to the panel must be broken at the device

screw terminal in order to maintain electrical supervision.

Temperature Range: 

0°C to 49°C  (32°F to 120°F)

Under no circumstances can the PS24 voltage exceed 33VDC or be less than 18VDC. 
Under no circumstances can the PS12 voltage exceed 18.7VDC or be less than 9.6VDC.
To calculate battery requirements, use current values shown above. However,  note that there is an in-rush current associated with
strobe power-up. The information in Figures 3 and 4 is useful when selecting fuse values.
As Figure 3 shows, 12V strobe in-rush current typically peaks at 3A and drops to nominal in 600

µ

S. In a 24V strobe (Figure 4), in-rush

current typically peaks at 7.0A and drops to nominal in 800

µ

S.

Note: If class “A” wiring is installed, the wire length may be up to 4 times the single wire length in this calculation.       

MODEL

PS12LO(W)

PS12M

PS24LO(W)

PS24M(W)

PS24LOA(W)

PS24MA(W)

Panel Voltage

12–17 VDC 

12–17 VDC

22.5 - 30 VDC

22.5 - 30 VDC

22.5 - 30 VDC

22.5 - 30 VDC

Max. Current Drain @
Listed Panel Voltage

50 mA

180 mA

25 mA

75 mA

50 mA

180 mA

Min. Light Output @
100% Viewing Angle
(See Fig 2)

1.5 candela

15 candela

1.5 candela

15 candela

1.5 candela

15 candela

86

87

88

89

90

91

92

10

12

14

16

18

20

22

Voltage

dBA output

F

I

R
E

60%

60%

100%

100% 100%

(REF)

7%

60%

60%

7%

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