Standard Features

• Low Profile, 1.5" high
  
• 2 or 4 wire base compatibility
  
• Highly Stable operation
  
• RF/Transient protection
  
• Low Standby Current
  
• Non-directional smoke chamber
  
• Vandal resistant security locking feature
  
• Built-in Magnetic detector sensitivity feature
  
• Compatible with PFS SIH-24F Ionization Detectors
  
• Relay bases available
  

The SLK-24F Underwriters Laboratories Listed and meets the requirements outlined in NFPA 72 Inspection Testing and Maintenance, Chapter 7.

Applications

The SKL-24F can be used in all areas where Photoelectric Smoke Detectors are required. It is best suited for smoldering or flaming fires.

HSB, HSC-4R, HSC-R, or YBA-M Style bases may be used with the SLK-24F. Current compatible devices are SLK-24FH, SLK-24FL, and SIH-24F.

Operation

The unit is comprised of an LED light source and silicon photo diode receiving element. In a normal standby condition, the receiving element receives no light from the pulsing light source. In the event of fire, smoke enters the detector and light is reflected from the smoke particles to the receiving element. The light received is converted into an electronic signal.

Signals are processed in the comparator, and when two consecutive signals exceeding the basic 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.

Engineering Specifications

The contractor shall furnish and install where indicated on the plans, dual-chamber, photoelectric smoke detectors Harrington Model SLK-24F. The combination detector head and twist-lock

Light Source	GaA1 as infared emitting diode
Rated Voltage:	17.6 - 33.0 VDC
Working Voltage:	15.0 - 36.3 VDC
Maximum Allowable Voltage	42 VDC
Supervisory Current	45 uA Max. @ 24 VDC
Surge Current	200 uA Max. @ 24 VDC
Alarm Current	150 mA Max. @ 24 VDC
Ambient Temperature	32-120 degree Farenheit (0-49 degree Celsius)
Test Feature	Use magnet; equivalent to 4-6% obscuration
Mounting	45, 40, 30

base shall be UL listed compatible with a UL listed fire alarm panel.

The base shall permit direct interchang with Harrington, SLK-24FH, combination photoelectric / heat detector, SLK-24FL low sensitivity photoelectric smoke detector, SIH-24F ionization type smoke detector, and/or AL-DFE-135 fixed temperature, rate of rise heat detector. The base shall limit the alarm current available to detectors. Base shall be appropriate twist-lock base HSB-4R, HSC-R, or YBA-M Style.

The smoke detector shall have a flashing status LED for visual supervision. When the detector is actuated, the flashing LED will latch on steady at full brilliance. The detector may be reset by actuating the control panel reset switch.

The sensitivity of the detector shall be capable of being measured.

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.

It shall be possible to perform a functional test of the detector without the need of generating smoke. The test method shall simulate effects of products of combustion in the chamber to ensure testing of detector circuits.

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.