XP95 Heat Detector
The XP95 Heat Detector monitors temperature by using a single thermistor which provides a count output proportional to the external air temperature.Ã‚Â The XP95 range features two heat detectors, standard and high temperature. The standard heat detector is classified as an A2S device and will report an alarm at 55Ã‚Â°C. The high termperature detector, classified as a CS device, will report an alarm at 90Ã‚Â°C.
- Ideal in environments that are dirty or smoky under natural conditions
- Well suited for warehouses, loading bays and carparks
- Unaffected by wind or atmospheric pressure
The XP95 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 devices monitor heat by using a single thermistor network which provides a voltage output proportional to the external air temperature. The standard heat detectors, 55000-400 and 55000-420, respond to increasing air temperature in such a way that they are classified as an A2S device. See Fig. 13. Both devices will give 55 counts at 55Ã‚Â°C.
A high temperature CS heat detector, 55000-401, which can be installed in a typical ambient temperature of 55Ã‚Â°C is available. See Fig. 14. This device will give 55 counts at 90Ã‚Â°C.
The detectors are designed to be connected to a two wire loop circuit carrying both data and a 17V to 28V dc supply. The detectors are connected to the incoming and outgoing supply via terminals L1 and L2 in the mounting base. A remote LED indicator requiring not more than 4mA at 5V may be connected between R and -R terminals. An earth connection terminal is also provided.
When a device is energised the ASIC regulates the flow of power and controls the data processing. The thermistor provides an output over normal operating ranges that is proportional to the external air temperature. This voltage output is processed in the A/D converter and stored by the communications ASIC. It is transmitted to control equipment when the device is interrogated. When a count of 55 is exceeded the alarm flag is initiated and the device address is added to the data stream every 32 polling cycles from its last polling for the duration of the alarm level condition, except when an alarming device is being interrogated. This can provide a location identified alarm from any device on the loop in approximately two seconds. The detector is calibrated to give an analogue value of 25Ã‚Â±5 counts at 25Ã‚Â°C.
XP95 Standard Heat Detectors operate over the range -20Ã‚Â°C to 70Ã‚Â°C, the High Temperature Heat Detectors operate over the range Ã¢â‚¬â€œ20Ã‚Â°C to 120Ã‚Â°C. The detectors are unaffected by atmospheric pressure.