DISCOVERY, Тепловые детекторы, 58000-400

Тепловые детекторы,
Порядковый номер 58000-400

Operating Principles

Discovery heat detectors have a common profile with ionisation and optical smoke detectors but have a low air flow resistance case made of selfextinguishing white polycarbonate.
The Discovery Heat Detector uses a single thermistor to sense the air temperature at the detector position.
The thermistor is connected in a resistor network, which produces a voltage output dependent on temperature. The design of the resistor network, together with the processing algorithm in the microcontroller, gives an approximately linear characteristic from 10°C to 80°C.
This linearised signal is further processed, depending on the response mode selected, and converted to an analogue output.
For the European standard version of the detector, the five modes correspond to five “classes” as defined in EN54–5:2001. The classes in this standard correspond with different response behaviour, each of which is designed to be suitable for a range of application temperatures. All modes incorporate “fixed temperature” response, which is defined in the standard by the “static response temperature”. The application temperatures and static response temperatures for all response modes are given in Table 6.
In addition to the basic classification, a detector may be given an “R” or “S” suffix. The “R” suffix indicates that the detector has been shown to have a rateof- rise characteristic. Such a detector will still give a rapid response even when starting from an ambient temperature well below its typical application temperature. This type of detector is therefore suitable for areas such as unheated warehouses in which the ambient temperature may be very low for long periods.
The “S” suffix on the other hand indicates that the detector will not respond below its minimum static response temperature even when exposed to high rates of rise of air temperature. This type is therefore suitable for areas such as kitchens and boiler rooms where large, rapid temperature changes are considered normal.


Detection principle: Heat sensitive resistance.
Supply wiring: Two-wire supply, polarity insensitive
Radioactive isotope: Americium 241
Terminal functions: L1 & L2 supply in and out connections
+R remote indicator positive connection (internal 2.2kΩ
resistance to positive)
–R remote indicator negative connection (internal 2.2kΩ
resistance to negative)
Operating voltage: 17–28V DC
Communication protocol: Apollo Discovery 5–9V peak to peak
Quiescent current: 400μA
Power-up surge current: 1mA
Maximum power-up time: 10s
Alarm current, LED illuminated: 3.5mA
Remote output characteristics: Connects to positive line through 4.5kΩ (5mA maximum)
Clean-air analogue value: 23 +4/–0
Alarm level analogue value: 55
Alarm Indicator: 2 colourless Light Emitting Diodes (LEDs); illuminating red in alarm. Optional remote LED
Temperature range: Maximum operating see Table 6
Minimum operating (no condensation/icing) –40°C
Storage –40°C to +80°C
Humidity: 0 to 95% relative (no condensation or icing)
Effect of atmospheric pressure: Less than 10% change in sensitivity over rated range
Atmospheric pressure: Operating: Suitable for installation up to 2,000m above sea level.
Effect of wind: Less than 20% change in sensitivity at speeds up to 10m/s. Note: slow changes in ambient conditions will automatically be compensated and will not affect sensitivity
Vibration, Impact and Shock: To EN54–5:2001
IP rating: 54 in accordance with BSEN60529
Dimensions: 100mm diameter x 42mm height
Weight: Detector 105g
Detector in base 160g
Materials: Housing: White polycarbonate V–0 rated to UL94
Terminals: Nickel plated stainless steel