3. STRUCTURE AND FUNCTION
The fire detector consists of two main parts: a base and a detector head. The latter consists of a
circuit board and an optimized smoke detection chamber. The detector head is fixed on the base
by the means of bayonet joints. When the detector head is being located on the base, make sure
the bench mark stands about 20 mm before the respective bench mark on the base; then rotate
clockwise to rest. The bench marks should fully coincide. The contacting plates are fixed to the
base. The connection between the incoming wires and the contact plates is made by the provided
screws and washers. The circuit board is mounted within the detector head. The contact blades
are placed on the detectors’ underside. The electric connection with the circuit board is provided
by retainer screws.
The electronic components are mounted on the circuit boards underside, the other side of the
circuit board provides mounting for the smoke detection chamber.
A flat pivot point screw is provided on the detector head to prevent unauthorized removal. A 2 mm
tip screwdriver is required for locking and unlocking .
TEST
Detector
head
Base Leading bench
mark
Parmanent
magnet test
LED
LED
Flat pivot
point screw
Fig. 1
The principle of functioning is based upon smoke particles entering the detector head’s smoke
chamber causing distraction of infrared rays within the chamber. The activation threshold of the
detector is factory set at a specific smoke concentration level. Upon activation the two red LEDs ,
situated on the detector head illuminate (360°visibility). They are extinguished by momentary
interruption of the detector’s power supply .
Detector’s type and sensitivity are marked.
4. PREPARING THE OPTICAL SMOKE FIRE DETECTOR FOR OPERATION
4.1. Mounting the fire detectors
Separate the base from the detector head by turning the detector head in an anti-clockwise
direction.
Feed the connection cable through the cable entry in the center of the base. Fix the base on the
ceiling using appropriate fixings. Complete the wiring as shown on fig. 2.1 or 2.2. Replace the
detector head on the base by offering the detector head to the base ensuring bench marks are no
more than 20 mm apart. Rotate the detector head in a clockwise direction to complete location.
Lock the detector head to the base by screwing the flat pivot point screw, using a 2 mm tip
screwdriver, ensure not to over tighten.
4.2. Connecting the base.
Connection to a fire alarm line with separate remote indicators RI
5
1
6
4
2
6
54
2
1
Fire Control
Panel
RI1
PSD-11
RIn
PSD-1n
EOLMOD*
Fig. 2.1
Connection to a fire alarm line with common remote indicator RI
5
1
6
2
45
6
12
4
Fire Control
Panel
RI
PSD-11 PSD-1n
EOLMOD*
Fig. 2.2
* EOLMOD – End of line module
4.3. Testing the fire detectors
Apply power in the range of 15 - 30V DC. Place a permanent magnet on the detector heads
surface at the point marked test periphery. The twin LEDs will illuminate after a few seconds. After
removing the magnet the LEDs should remain lit until reset by momentary interruption of the
power supply.
Testing can also be completed under simulated fire conditions using a smoke probe.
5. SERVICE SCHEDULE
Task Periodicity
1. Inspection for visible physical damage weekly
2. Satisfactory operation test monthly
*3. Check and clean dust contamination every 6 months
4. Check and clean base and head contacts and connections Annually
* Remove the chamber’s upper part. Brush the optical system and the lenses. For the
chamber’s upper part can be detergent washed, rinsed and dried. When locating, fix the upper
part so the bench marks coincide.
6. WARRANTY
The manufacturer guarantees product compliance with the EN 54-7:2001. The warrant period is
36 months from the date of manufacture, providing that requirements covered in section 5 have
been observed.
