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Frequently asked questions

What is linear heat detection?

Linear heat detection is a continuous line of heat detection in cable form.

What is the difference between analogue and fixed temperature linear heat detection?

Analogue linear heat detection senses any change in temperature by continually measuring the electrical resistance between a metallic core and screen. Heat will decrease the cable’s resistance. If the change in temperature and thereby the decrease in resistance is sufficient the controller creates an alarm.

Signaline HD is an analogue resettable linear heat detector

Signaline FT, our fixed temperature linear heat detector, triggers an alarm when the cable reaches a pre-determined temperature. Fixed temperature is also known as digital due to the fact it is either on or off.

Does Signaline FT need a controller?

No, Signaline FT, FT-R, FT-X cable ranges do not need a controller. Signaline FT, FT-R and FT-X linear heat detectors can be connected to a conventional fire control panel via a Signaline UCB (Universal Connector Box).

Signaline FT, FT-R, FT-X can also be connected to an addressable fire control panel without a controller. Simply connect the cable to an zone monitor unit.

What should the difference between ambient and alarm temperature?

The cables are designed to stay in an environment 20°C below the alarm temperature. This allows the ambient to fluctuate naturally, summer highs and winter lows for example, without causing unwanted alarms. Therefore always allow at least a 20°C difference between ambient and alarm.

Where should I use the nylon coated cable?

Signaline FT-R range come with a nylon coating. This gives the cable increased chemical and UV protection to the cable. Therefore if there are harmful atmospheric gases or long exposures to UV rays you should consider the nylon coating for your cable.

Where should I use Signaline Stainless steel braided?

The stainless steel braid is designed to protect the cable from mechanical hazards. Therefore if the cable is going into machinery such as escalators or conveyors this would be the cable you should use.

We can apply the stainless steel braid to any of our standard HD, FT, FT-R or FT-X range of linear heat detection cables

How much Signaline Fixed temperature Linear heat detection cable can you have per zone?

Signaline FT is capable of going into alarm at any point up to 3,000m. The Signaline LocatorPlus will give you a pinpoint reading as to where the cable has gone into alarm.

Can I use Signaline Fixed temperature Linear heat detection cable on addressable systems?

Yes! Connect the cable to the suitable addressable interface and you can use up to 3000m of cable like normal.

Can I join lengths of different temperature Signaline Fixed temperature Linear heat detection cable together?

You should never join different Signaline FT temperatures together.

Can I reuse a length of Signaline Fixed temperature Linear heat detection that has gone into alarm?

No, the length of cable affected must be replaced.

Can I splice a section of cable that has been damaged? What do I need to be able to do this?

Simply remove the damaged section and replace it with a new length of identical Signaline cable. Join the cable together using a Signaline UCB.

What’s the maximum cable length of Signaline HD per controller?

The maximum length is 300m.

What’s the minimum cable length of Signaline HD per controller?

The minimum amount of cable per controller is 5 metre.

Can I join lengths of Signaline HD cable together?

Yes. Use a Signaline UCB (Universal Connectior Box) as the connection between the two lengths.

Can I reuse a length of Signaline HD that has gone into alarm?

Yes, providing it has not been destroyed.

Is Signaline HD fireproof?

No, it is not a fire proof cable and can be destroyed in a fire.

Which Clip should I use?

The answer to this question depends on which cable you are using and the application you are using it for. Signaline offers a wide range of clips so we will always be able to match the correct clip to your application. Please contact our offices for advice on which clip to use.