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Order Naffco Fire Equipment

Posted by joseph on July 23, 2021 at 9:10 AM Comments comments (0)
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New Update on BS5839

Posted by joseph on September 20, 2017 at 2:10 AM Comments comments (0)

On 1st September 2017, BS 5839-1 2017 was released.

The revised standard includes 25 changes to 14 existing clauses; the key changes will be discussed in this blog.

Call Point Covers

The biggest change, and the one that everyone is talking about, is the recommendation for call point covers. Going forward, all call points should be installed with a call point cover. The standard does not specify whether existing installations should be updated to include call point covers, however if an existing installation doesn’t have call point covers and the risk assessment indicates they are not required, it would be best practice to record this as a variation in the fire detection log book.


The definition of a ‘multi-sensor’ has been somewhat in dispute in recent years. Under section 3, in the Terms and Definitions, clause 3.40 defines a multi-sensor as, a “fire detector that monitors more than one physical and/ or chemical phenomenon associated with fire”. If you read on through the standard, it acknowledges that a multi-sensor could be; optical and heat, CO and heat, or smoke, heat and CO2.

The standard does however accept that a multi-sensor can also be used in a single sensor state. Whichever state the multi-sensor is being used in, the detector should meet the performance requirements of the appropriate part of BS EN 54. The standard also explains that the testing of a multi-sensor can be carried out with the application of modern sensor test equipment.


Video Fire Detection

Technology continues to develop at a phenomenal rate, as such, video fire detection is now a recognised specialised fire detection technique, specifically for L5 and P2 consultant specified categories.

Annexe E

Annexe E details the correct procedure for the selection of detector type, to reduce false alarms.

In a further attempt to reduce false alarms, Annexe E also recommends;

The use of staff alarms to validate a fire alarm and avoid unnecessary mass evacuation and/or fire service call outs.

Linking fire alarm systems to security alarms to ensure that the responsible person is notified, even when there is no-one in the office at night. However, it is important to ensure that the battery capacity of the security alarm is equal to that of the fire alarm.

The deactivation of the connection to the alarm receiving centre (ARC) during maintenance to avoid unnecessary call outs.


BS 5839-1 2017 also makes reference to PD6669:2017, which builds upon the existing BS EN 50136; in which, new alarm transmission system (ATS) categories, SP3+ and DP2+, have been introduced.

SP3+ has a primary ATP reporting time of 10 minutes, a catastrophic failure reporting time of 10 minutes and an ATS reporting time of 10 minutes.

DP2+ has a primary ATP reporting time of 10 minutes, a catastrophic failure reporting time of 11 minutes and an ATS reporting time of 20 minutes.

We hope this quick reference to the changes incorporated into BS 5839-1 2017 has been useful, however it should not be used as a substitute to the British Standard Document.

There are several other changes that have not been included in this blog, therefore please refer to BSI for full details.

Zeta MKII protocol devices replacement for standard protocol devices

Posted by joseph on July 24, 2017 at 12:20 PM Comments comments (4)

It has come to my knowledge that so many of fire alarm systems installers are faced with problem of replacing the old Zeta addressable standard protocol devices. Zeta, since 2004 phased out the standard addressable protocol devices while they rolled out new model of devices; the Fyreye MKII protocol devices. Since then, there's no longer Support for the standard protocol devices. However, all hope is not lost. 

For the securetone addressable sounders having standard protocol, the replacement has been rolled out in MKII protocol.

This device can now be conviniently replaced with the latest MKII - AXT/R Sounders and they will still work very well with the same standard protocol:

Check back for more updates on replacement devices of standard protocol devices to MKII protocol devices

Latest Zeta Hand Programming Tool

Posted by joseph on July 24, 2017 at 11:55 AM Comments comments (0)

All we need to know about this wonderful programming handheld tool:

This tool is primarily used to soft address Fyreye MKII addressable Devices. But the most important thing about this tool is that it can also be used to convert MKII protocol devices to Standard protocol especially for the input /output modules of any kind.

Declare your interest if you need this information free!

Also you can get most of information on Zeta Handheld Programmer through this link: