Key Features:
- The Alarmline controller ensures that the heat sensing cable system is compatible with most fire control panels.
- Alarmline can be used in hazardous area installations providing the cable is protected with suitable Zener barriers.
- For arduous environments optional nylon and metallic braiding are available.
- Alarmline is self restoring after an alarm fire providing it has not been destroyed or severely mechanically damaged or has not been directly subjected to temperatures greater than 120°C for excessive periods.
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The cable consists of four conductors protected by a high temperature PVC insulation. Two of the four cores are temperature sensitive being insulated with a negative temperature coefficient material. The other two cores are insulated with normal PVC insulation. The cores are twisted together within the outer high temperature sheath. The cable is connected to an Alarmline controller and the far end of the cable is terminated with each temperature sensitive core connected to one of the normal PVC insulated cables. This provides for open circuit or short circuit protection throughout the cable length.
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Principle of Operation
Alarmline cable senses temperature variations using the Alarmline controller to continuously monitor the resistance of the two cores insulated with a negative temperature coefficient material.
A change in temperature produces a relative change in resistance, as temperature increases, resistance is lowered. This change is monitored by the controller, which actuates an alarm signal at a predetermined level. The integrating effect of the Alarmline sensor cable enables detection of a localised hot spot or a lower level of temperature over its total length. Provided the sensor cable has not been directly subjected to temperatures greater than 120oC for excessive periods, it will recover to its normal condition.
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Technical Specification
| Conductor diameter |
0.46mm |
| Dielectric Thickness |
0.34mm |
| Outer sheath thickness |
0.25mm |
| Twist turns of inner conductors |
82 +/-5 per metre |
| Conductor material |
Copper |
| Dielectric material |
Cores 1 and 3: NTC polymer
Cores 2 and 4: PVC |
| Core Colours |
Orange, White, Red and Blue |
| Service life |
30 years up to 100°C |
| Voltage Insulation |
10KV between outer sheath and a conductor |
| Storage Temp. Limits |
-40°C to +90°C |
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End of Line Termination
Alarmline cable is easily terminated on site, using an end of line termination kit, part no K82023 or in a junction box. Within hazardous areas termination must be with an approved junction box.
The WHITE and ORANGE cores are connected together and the BLUE and RED cores are connected together. An end of line resistor is not required.
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Alarmline Analogue Cable Controller
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The Alarmline controller monitors Alarmline heat sensing cable. Two types are available:
K82012 provides for two-wire wiring direct to conventional fire panels.
K82194 with auxiliary FIRE and FAULT relays. This can be used for stand along operation or integration via a suitable interface to an analogue fire control panel.
Both types are housed within polycarbonate enclosures to IP55 with a hinged lid. |
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Controller Specification
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K82012 |
K82194 |
| Enclosure Material |
Polycarbonate to IP65 |
| Dimensions (HxWxD) |
170mm x 105mm x 111mm |
| Current Consumption: |
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| Quiescent |
57mA |
77mA |
| Alarm |
53mA |
82mA |
| Fault |
160mA |
15mA |
| Operating Temperature |
-25°C to +55°C |
| LED Warning indicators |
FIRE: Continuous Red
FAULT Flashing Yellow |
| Fire and fault relay outputs |
Volt free rated at 2A 24Vdc* |
| Test switches |
Verification of Fire and Fault operation in both modes. |
| Alarm trip selector |
Internally mounted 12 position link setting |
| Approvals |
FM** |
*Fault output may be wired in series for normal two-wire operation or connected seperately. |
**This combination of cable and controller has not been approved to EN54 Standard. Click here for an EN54 approved heat sensing system. |
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