Alarmline II Digital EN Dual Zone Digital Location Control Unit

General The digital location control unit is a dual zone module for monitoring up to two zones of AlarmLine II Digital EN Linear Heat Detection Cable. If an overheat or fire situation triggers either zone of the digital cable the unit automatically calculates and displays the distance along the cable, in feet and metres, to the alarm point. The two zones can operate independently of each other, or in interlock mode. A separate alarm and normally conducting fault output are provided for each zone. The unit is intended to be installed between the AlarmLine II digital EN linear heat detection cable and a conventional or addressable fire alarm control panel. It has power, fault and alarm indicators, as well as free outputs for fault and alarm, corresponding to each zone. It may also be connected to a industrial process control system using the two wire RS-485 Modbus RTU output. Modes of operation 1. Independent - This is when the unit is used as a two zone system. When a fault or overheat condition occurs on an LHD zone, the corresponding fault or alarm output respectively is triggered. The two zones operate independently and both sets of outputs should be connected to a fire alarm control panel. 2. Interlock - this mode is for applications which require a fail-safe guarantee that an alarm is only triggered when an overheat condition has been detected. This mode may also be known as coincidence detection. In this case, the same rated temperature LHD cable should be attached to both zones of the unit. The alarm output is only activated when both LHD cables trigger an alarm due to an overheat condition. If one LHD cable zone input registers an alarm but the second does not, the alarm output will not be activated. Modbus communication The unit includes a two wire RS-485 Modbus output which can be enabled to output the status of each zone of the digital location control unit, via Modbus RTU/ASCII protocol. In case of an alarm, the location (in distance along the cable) is also communicated via Modbus. Interconnecting cable The unit supports the use of a interconnecting cable (leader cable) in between the control unit and the linear heat detection cable. The interconnecting cable is used in applications where the control unit is not located in the detection zone. The interconnecting cable is then used to connect the control unit in one location, with the linear heat detection cable in the protected area. The interconnecting cable is available in 100 m lengths, under the product code AAI-0100.

Firesense is a leading independent UK distributor of fire detection, fire safety and security equipment, supporting professional installers and businesses across the country. Established in 1992 and based in Tunbridge Wells, the company has more than 30 years of experience within the fire and security industry.

Originally founded as a specialist manufacturer of conventional fire alarm control panels, Firesense has developed into a comprehensive supplier of fire detection, security, emergency lighting and life safety products. The company works with a wide range of recognised manufacturers, helping customers access reliable equipment for projects of different sizes and requirements.

Firesense supplies conventional, addressable, wireless and two-wire fire alarm systems alongside detectors, control panels, manual call points, sounders, cables, batteries, emergency lighting, fire alarm testing equipment and related accessories. Its expanding security range also includes CCTV, intruder alarm, access control and smart security solutions.

A key strength of Firesense is its experienced technical and account management team. Customers can receive practical product guidance and support when selecting equipment, designing systems or resolving technical enquiries. As an independent distributor, Firesense can recommend suitable products from across its available ranges rather than being restricted to a single manufacturer.

With extensive stock held at its Tunbridge Wells distribution centre, Firesense aims to provide fast and reliable nationwide supply, including rapid dispatch and trade counter collection.

For fire detection, security or life safety equipment, visit the Firesense website or speak with their experienced team for product advice, availability and help with your enquiry.

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