POTTER PS-24 Conventional Photoelectric Smoke Detector Owner’s Manual

: June 9, 2024
: POTTER

Table of Contents

POTTER PS-24 Conventional Photoelectric Smoke Detector
Instruction
Standard Features
Application
Operation
Engineering Speciﬁcations
PS-24 Sensitivity Test Feature
References
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Download This Manual (PDF format)

POTTER PS-24 Conventional Photoelectric Smoke Detector

Instruction

UL, ULC, and CSFM Listed, FM Approved
Light Source: GaAIAs Infrared Emitting Diode
Rated Voltage: 17.7 – 33.0 VDC
Working Voltage: 15.0 – 33.0 VDC
Maximum Voltage: 42 VDC
Supervisory Current: 45 µA Max. at 24 VDC
Surge Current: 160 µA Max. at 24 VDC
Alarm Current: 150 mA Max. at 24 VDC
Ambient Temperature: 32°F to 120°F (0°C to 49°C)
Sensitivity Test Feature: Automatic Sensitivity window veriﬁcation test. Mounting: Refer to Potter SB Series Smoke Detector Base series,
bulletin no. 8840008.
Stock number: 1430011

Standard Features

Low proﬁle, 1.8” high (with base)
2 or 4 wire base compatibility, relay bases available
Highly stable operation, RF/Transient protection
Low standby current, 45 µA at 24 VDC
Two built-in power/sensitivity supervision/alarm LED’s
Non-directional smoke chamber
Vandal resistant security locking feature
Built-in magnetic go/no go detector test feature
Removable smoke labyrinth for cleaning or replacement
Automatic Sensitivity window veriﬁcation function meets outlined requirements in NFPA 72, Chapter 7, Inspection, Testing and Maintenance.
Compatible with IS-24 ionization detectors
Backwards compatible with Potter PS and IS detectors.
Compatible with Potter releasing controls

Application

The PS-24 can be used in all areas where Photoelectric Smoke Detectors are required. The wide range smoke chamber makes the PS-24 well suited for ﬁres ranging from smoldering to ﬂaming ﬁres.
SB Series Style bases may be used with the PS-24. Current interchangeable/compatible devices are the IS-24 ionization detector.

Operation

The PS-24 photoelectric smoke detector utilizes two bi-colored LED’s for indication of status. In a normal standby condition the LED’s ﬂash green every 3 seconds. When the detector senses that its sensitivity has drifted outside the UL listed sensitivity window the LED’s will ﬂash red every 3 seconds. When the detector senses smoke and goes into alarm the status LED’s will latch on red.
The detector utilizes an infrared LED light source and silicon photo diode receiving element in the smoke chamber. In a normal standby condition, the receiving element receives no light from the pulsing LED light source. In the event of a ﬁre, smoke enters the detector smoke chamber and light is reﬂected from the smoke particles to the receiving element. The light received is converted into an electronic signal.
Signals are processed and compared to a reference level, and when two consecutive signals exceeding the reference level are received within a speciﬁed period of time, the time delay circuit triggers the SCR switch to activate the alarm signal. The status LED’s light continuously during the alarm period.

Engineering Speciﬁcations

The contractor shall furnish and install where indicated on the plans, Potter Model PS-24 photoelectric smoke detectors. The combination detector head and twist-lock base shall be UL listed compatible with a UL listed ﬁre alarm panel.
The base shall permit direct interchange with Potter, PS-24H, combination photoelectric/heat detector and IS-24 ionization type smoke detector. The base shall be appropriate twist-lock base SB Series. In the event of partial or complete retroﬁt, the PS-24 may be used in conjunction with, or as a replacement for, Potter detectors (PS-24, PS-24H and the IS-24) the SB base applications.
The smoke detector shall have two ﬂashing status LED’s for visual supervision. When the detector is in standby condition the LED’s will ﬂash green. When the detector is outside the UL listed sensitivity window the LED’s will ﬂash red. When the detector is actuated, the ﬂashing LED’s will latch on red. The detector may be reset by actuating the control panel reset switch.
The sensitivity of the detector shall be capable of being measured. It shall be possible to perform a functional test of the detector without the need of generating smoke. The sensitivity of the detector shall be monitored automatically and continuously to verify that it is operating within the listed sensitivity range.
To facilitate installation, the detector shall be non-polarized. Voltage and RF transient suppression techniques shall be employed to minimize false alarm potential. Auxiliary SPDT relays shall be installed where indicated.
The vandal-resistant, security locking feature shall be used in those areas as indicated on the drawing. The locking feature shall be ﬁeld removable when not required.
Speciﬁcations subject to change without notice.

PS-24 Sensitivity Test Feature

The PS-24 Photoelectric Smoke Detector has a built-in automatic sensitivity test feature.

In normal condition, both LED’s ﬂash green.
When the sensitivity drifts outside of its sensitivity limits, both LED’s ﬂash red.
In the alarm state both LED’s are red continuously.
When the sensitivity drifts outside of its sensitivity limits and both LED’s ﬂash red, the device needs to be cleaned or returned to the factory for cleaning.

MKT. #8840007 – REV G 8/04
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