Siemens OH720 - Heat Detectors (HI720, HI722)

2BStructure and function
17BPoint detector
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Building Technologies
A6V10212047_m_en_--
Fire Safety
2015-05-04
3.2.3 Heat detector
The heat detectors HI720 and HI722 have a straightforward design featuring a
thermal sensor.
The following table indicates the most important differences between the two heat
detectors.
HI720
HI722
Alarm activation by: ● Temperature increase
● Reaching the maximum
temperature
● Reaching the maximum
temperature
Number of parameter sets 2 1
Structure and function
1 Heat sensor
The heat detector HI720 has two parameter sets: 'A2S' (static) and 'A2R'
(differential).
The heat detector HI722 has one parameter set: 'A2S' (static).
The heat detectors HI720 and HI722 address themselves automatically when the
control panel is first switched on, thus enabling individual identification in the event
of an alarm.
If a short-circuit occurs, the defective part on the detector line is located by the
control panel and isolated between two detectors. In addition, a loop line
installation ensures an optimum level of safety.
See also
 Heat detector [➙ 33]
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