Alarm Systems

Intruder Alarm Systems

Stemar supply, install and maintain the most commonly used and popular alarm systems that include Paradox, DSC, Caddx, IDS, Texecom and Ajax

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What is An Intruder Alarm System:

Intruder alarm systems are made up of three component parts designed to detect, determine and deter criminal activity or other threatening situations. An alarm system can detect an event such as an invasion, fire, gas leak or environmental changes, determine if the event poses a threat and then activate any connected devices, sirens, strobes as well as alert your armed response company.


The purpose of an intruder alarm system is:

  • To protect the physical assets and people within a premises
  • To deter crime and vandalism
  • To ensure a prompt armed response service is dispatched in response to an alarm signal


Commonly utilised detection devices include:

  • Motion detectors / Passive Infra-Red Sensors (PIR’s)
  • Break glass sensors
  • Vibration sensors
  • Seismic vault and safe detectors
  • Smoke and heat detectors
  • Door and window magnetic contacts
  • External beams and outdoor passives for early detection and warning


Design of the Alarm system:

The key to an effective intruder alarm system is the careful selection and placement of the detection devices, so as to best suit the environment and risk level.

Outdoor detection is possibly the most important part of one’s security whilst at home!!

Intruders aim for the element of surprise to gain the upper hand of an invasion. They will do so by peering through windows to gain intel. By installing Outdoor detectors to protect all doors, windows and vulnerable areas, a Safe-Zone of up to 15m will be created around the house that will activate the perimeter alarm well before intruders are able to get close to the house. By doing so, their element of surprise is lost and siren noise scares them off.

Incorrectly positioned devises can render the system useless. This is where knowledge based on experience as well as a full understanding of how the devises actually work plays a huge roll in:

  • avoiding false alarms
  • providing protection where it matters
  • obtaining an alarm activation early enough to be able to respond to during an actual threat


Type of Alarm Systems:

  • Hard wired systems – requires cabling between the alarm control panel and its detection devices and controllers
  • Wireless systems – they are generally standard wired alarm systems that essentially include add-on wireless receiver modules to integrate wireless detectors and remote controls into the system. The wireless range between the wireless devices and receiver module and is limited to around 30 – 35m.
  • Smart alarm systems – generally include real time monitoring of the alarm via mobile apps and includes advanced features and functionality. We highly recommend the Ajax system, click HERE for more info


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