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

: June 9, 2024
: POTTER

Table of Contents

Features
Description
Operation
Technical Specifications
Specifications
CPS-24 Sensitivity Test Feature
Ordering Information
Customer Support
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POTTER CPS-24 Conventional Photoelectric Smoke Detector

Features

Suitable for in-duct applications
360° view of detector status LED
Low profile, 2” high (with base)
2 or 4 wire base compatibility, relay bases available
Highly stable operation, RF/Transient protection
Low standby current, 59μA at 24VDC
One built-in power/sensitivity supervision/alarm LED
Automatic Sensitivity window verification function meets outlined requirements in NFPA 72, Chapter 2 & 7, Inspection, Testing and Maintenance.
Magnetic Test Feature

Description

The CPS-24 is a reliable, high quality Photoelectric Smoke Detector. It can be used in all open areas where Photoelectric Smoke Detectors are required, including in-duct applications. The computer-designed smoke chamber makes the CPS-24 well suited for detecting smoldering fires as well as fast-flaming fires.

Operation

The CPS-24 photoelectric smoke detector utilizes one bicolored LED for indication of status. In a normal standby condition the LED flash Green every 3 seconds. When the detector senses that its sensitivity has drifted outside the UL listed sensitivity window the LED will flash Red every 3 seconds. When the detector senses smoke and goes into alarm the status LED will latch on Red
The detector utilizes an infrared LED light source and silicon photodiode 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.
Fire Judgement signals are processed and compared to a reference level, and when five 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 lights continuously during the alarm period.

Technical Specifications

Light Source	GaAIAs Infrared Emitting Diode
Rated Voltage	12 or 24 VDC
Working Voltage	8 – 35.0 VDC
Maximum Voltage	42 VDC
Supervisory Current	59μA @ 24 VDC
Surge Current	160μA max. @ 24VDC
Alarm Current	150mA max. @24 VDC
Air Velocity Range	0-4000 fpm
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.

Specifications

The contractor shall furnish and install where indicated on the plans, Potter Electric Signal CPS-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 PotterCPS-24 photoelectric smoke detector. The base shall be appropriate twist-lock base SB Series.
In the event of partial or complete retrofit, the CPS-24 may be used in conjunction with, or as a replacement for, Potter detectors (PS-24, PS24H and the IS-24) on most SB base applications.
The smoke detector shall have one flashing status LED for visual supervision. When the detector icing standby condition the LED will flash Green. When the detector is outside the UL listed sensitivity window the
LED will flash Red. When the detector is actuated, the flashing LED 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.
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.

CPS-24 Sensitivity Test Feature

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

In normal condition, the status LED flashes green.
When the sensitivity drifts outside of its sensitivity limits, the status LED flashes red.
In the alarm state, the status LED is red continuously.
When the sensitivity drifts outside of its sensitivity limits and the status LED flashes red, the device needs to be cleaned or returned to the factory for cleaning or calibration.