The addressable heat detector AFD-H 29A2R

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The addressable heat detector AFD-H 29A2R is used to detect fire, which comes with rising in temperature inside the room, and to send the “Fire” signal to the FAP “Rubezh-2AM” and BUNS-01. The feeding and information exchange is carried out through the two-wired signaling line. The detector can detect the fire in two ways: when the temperature reaches the set maximum or by measuring the speed of temperature rising. The detector does not react upon humidity changes, flame, daylight or candlelight.

The addressable heat detector AFD-H 29A2R is a differential-peak annunciator, which can detect fire not only by temperature of the air, but also by measuring the speed of temperature rising. The heat sensor we use is a thermistor – a kind of a resistor which changes its resistance depending on temperature. Its advantage is its high temperature sensitivity and greater resistance which does not need signal amplification.
The annunciator detects the speed of temperature rising basing on comparison the present temperature to the previous temperature value. When the speed of temperature rising exceeds the set threshold the control panel forms a signal of fire alarm. It helps to avoid false detector’s activation at fast temperature changing in optimum situations e.g. door opening or turning on heaters.

The addressable heat differential-peak detector AFD-H 29A2R (64-76C) is used for the following: - measuring the temperature
- measuring the speed of temperature rising
- processing the measurement data according to embedded algorithms and taking the decision to form a signal of fire alarm
- indication of the detector’s working mode.

The detector is a device of direct temperature measuring. The data processing is done by an embedded microprocessor. The annunciator consists of the detector itself and a socket. There is a board with installed electronic components inside the plastic detector’s body.
The in-cut connection of the detector and the socket ensures annunciator’s simple installation and maintenance.
A red LED indicates the detector’s mode. See Table No.1

Table No.1

The "Fire" signal keeps on working also after temperature influence has stopped and can be reset by control panel.

The main technical information:
- Operation temperature –25 – +70°C.
- Activation temperature 64-76°C. Depending on the speed of temperature rising also changes the time of detector activation.
- It is possible to check the temperature in the room using the FAP "Rubezh-2AM".
- The feeding and information exchange with the FAP "Rubezh-2AM" is carried out through the two-wired signaling line which can have a large number of branches.
- To test the AFD-H 29A2R you can push the button on the detector or using a special laser pointer OT-1.
- Activation time at the temperature +25°C see in Table No.2

- Voltage – (24±4) В.
- Maximum consumption current in standby mode – not more than 150 microamp.
- You can set an address to the detector. The address consists of two parts:
   - address number of the signaling line;
   - detector’s address in the signaling line.
- Dimensions – Ø93x60 mm.
- Weight – 210 g.
- Degree of protection – IP30.
- Body colour – white (any colour on customer’s demand).
- Life time – 10 years.
- MTBF – 60000 hours.

Line coupling