I.S. Sounder Circuits

[Allen Higginson]

Quick question - how many sounders can you have on an IS sounder circuit?
The answer may caue damage to my head through impact with the desk!

[Benzerari]

Quick question - how many sounders can you have on an IS sounder circuit?
The answer may caue damage to my head through impact with the desk!

What you mean by 'IS sounder circuit'? for what so ever, it is the (proper calculation) that can tel you how many sounders in any given sounder circuit you need. taking into account the max. current consumption of the whole load.

[Wiz]

Quick question - how many sounders can you have on an IS sounder circuit?
The answer may caue damage to my head through impact with the desk!

The purposes of the zener barrier between a normal sounder circuit and an Intrinsically Safe sounder is to restricts the electrical energy available on the IS side to prevent 'sparks' that could ignite flammable vapour. Therefore there must be some restriction that will affect the amount of current that can be drawn. I do not have my Fulleon password available here at home to download the technical info to confirm any answer about their IS equipment and I'm on holiday from Monday. Maybe someone else can look it up on the Fulleon website.

[Galeon]

Buzz ,

35 ma on a sounder , allow 50 ma with a beacon , Apollo sounder controller cut the link for I.S unit fused as 1 amp .

[Allen Higginson]

Buzz ,

35 ma on a sounder , allow 50 ma with a beacon , Apollo sounder controller cut the link for I.S unit fused as 1 amp .

Hi mate - the Fulleon IS sounder draws 14mA.
The guys in our office have told me that through a galv barrier you can only put on 2 sounders max per circuit - due to the fact I have designed 11 split over two circuits you see my problem!!!

[Allen Higginson]

Quick question - how many sounders can you have on an IS sounder circuit?
The answer may caue damage to my head through impact with the desk!

What you mean by 'IS sounder circuit'? for what so ever, it is the (proper calculation) that can tel you how many sounders in any given sounder circuit you need. taking into account the max. current consumption of the whole load.

IS = Intrinsically Safe as per Wiz!

[Galeon]

Buzz ,
If its any help a company called e2s warning signals have an alarm driver  for IS sounders rated @ 80 ma load so with your 14ma Fulleons you may get away with 5 .

[Benzerari]

Buzz If I have well understood your question, any fire alarm system is designed to support a limited number of sounders... isn't?

In your case your system is designed to support a number of normal sounders per sounder circuit call it 'Xn', with a unit current consumption call it 'In'.

How ever, if replacing the normal sounders by IS (Intrinsically Safe) ones the new unknown number call it 'Xis', these later should have a Unit current consumption of 'Iis'

Where:

Xn: well defined through manufacturer instruction Guide
In:  well defined through manufacturer instruction Guide
Iis:  well defined through manufacturer instruction Guide
Xis: Unknown

Therefore:

Xn ---------------> In
Xis ---------------> Iis         Then: Xis = (Xn * Iis)/In = Number of IS sounder required

Hope this help, and please forgive my ignorance, if I am away from the main subject

[Allen Higginson]

Buzz ,
If its any help a company called e2s warning signals have an alarm driver  for IS sounders rated @ 80 ma load so with your 14ma Fulleons you may get away with 5 .

Hi mate - been on their site the other day but can't find anything other than sounders and beacons.

[Galeon]

Alright Buzz ,
Detection supplies tel 01425 658239 Catalogue Page 23 Ref MT5022 web link is the catalogue , good hunting.
www.detectionsupplies.co.uk

[Wiz]

Buzz If I have well understood your question, any fire alarm system is designed to support a limited number of sounders... isn't?

In your case your system is designed to support a number of normal sounders per sounder circuit call it 'Xn', with a unit current consumption call it 'In'.

How ever, if replacing the normal sounders by IS (Intrinsically Safe) ones the new unknown number call it 'Xis', these later should have a Unit current consumption of 'Iis'

Where:

Xn: well defined through manufacturer instruction Guide
In:  well defined through manufacturer instruction Guide
Iis:  well defined through manufacturer instruction Guide
Xis: Unknown

Therefore:

Xn ---------------> In
Xis ---------------> Iis         Then: Xis = (Xn * Iis)/In = Number of IS sounder required

Hope this help, and please forgive my ignorance, if I am away from the main subject

Benz, the problem with IS systems is that there is a device known as a barrier that is positioned between the normal sounder circuit and the IS sounders. This barrier restricts the electrical energy available on the IS side of the circuit and therefore will limit the number of sounders that you can connect to it. The problem Galeon has is determining what current his barrier will allow, and how many sounders he can therefore use with it.

[Allen Higginson]

Buzz If I have well understood your question, any fire alarm system is designed to support a limited number of sounders... isn't?

In your case your system is designed to support a number of normal sounders per sounder circuit call it 'Xn', with a unit current consumption call it 'In'.

How ever, if replacing the normal sounders by IS (Intrinsically Safe) ones the new unknown number call it 'Xis', these later should have a Unit current consumption of 'Iis'

Where:

Xn: well defined through manufacturer instruction Guide
In:  well defined through manufacturer instruction Guide
Iis:  well defined through manufacturer instruction Guide
Xis: Unknown

Therefore:

Xn ---------------> In
Xis ---------------> Iis         Then: Xis = (Xn * Iis)/In = Number of IS sounder required

Hope this help, and please forgive my ignorance, if I am away from the main subject

Benz, the problem with IS systems is that there is a device known as a barrier that is positioned between the normal sounder circuit and the IS sounders. This barrier restricts the electrical energy available on the IS side of the circuit and therefore will limit the number of sounders that you can connect to it. The problem Galeon has is determining what current his barrier will allow, and how many sounders he can therefore use with it.

Its actually my problem but Galeon is welcome to it!!

[Galeon]

Buzz ,
No I must insist that you keep your I.S Barrier , I will stick with me eol.(previous thread).

[kurnal]

Buzz If I have well understood your question, any fire alarm system is designed to support a limited number of sounders... isn't?

In your case your system is designed to support a number of normal sounders per sounder circuit call it 'Xn', with a unit current consumption call it 'In'.

How ever, if replacing the normal sounders by IS (Intrinsically Safe) ones the new unknown number call it 'Xis', these later should have a Unit current consumption of 'Iis'

Where:

Xn: well defined through manufacturer instruction Guide
In:  well defined through manufacturer instruction Guide
Iis:  well defined through manufacturer instruction Guide
Xis: Unknown

Therefore:

Xn ---------------> In
Xis ---------------> Iis         Then: Xis = (Xn * Iis)/In = Number of IS sounder required

Hope this help, and please forgive my ignorance, if I am away from the main subject

Hey Benz I reckon that explanation warrants a prize of some kind. Dont know what it means but I think it at least deserves free membership of the FBS and personal attention from Matron. Perhaps even the award of FIFBS.
Best wishes
Kurnal GradIFBS

[Benzerari]

Buzz If I have well understood your question, any fire alarm system is designed to support a limited number of sounders... isn't?

In your case your system is designed to support a number of normal sounders per sounder circuit call it 'Xn', with a unit current consumption call it 'In'.

How ever, if replacing the normal sounders by IS (Intrinsically Safe) ones the new unknown number call it 'Xis', these later should have a Unit current consumption of 'Iis'

Where:

Xn: well defined through manufacturer instruction Guide
In:  well defined through manufacturer instruction Guide
Iis:  well defined through manufacturer instruction Guide
Xis: Unknown

Therefore:

Xn ---------------> In
Xis ---------------> Iis         Then: Xis = (Xn * Iis)/In = Number of IS sounder required

Hope this help, and please forgive my ignorance, if I am away from the main subject

Hey Benz I reckon that explanation warrants a prize of some kind. Dont know what it means but I think it at least deserves free membership of the FBS and personal attention from Matron. Perhaps even the award of FIFBS.
Best wishes
Kurnal GradIFBS

Kurnal, what I meant by this simple explanation is that the number of sounders is unversaly proportional to the current drawn by each sounder type, it is just a lineair variation, the less current drawn by the sounder the more sounders you can fit, but the max number of sounders is limited any way, for what so ever type of sounders...

The power at the sounder circuit using a normal sounder is limited (Req * I²). If 'Req' gets down due to some sounder types, the current 'I' raises up to keep up (Req * I²) remains constant and so more sounders can be used and vis versa...  if 'Req' gets up when using IS sounder i.e. the current 'I' drops down and so less sounders are permited by sounder circuit..   the calculation in the next post explains how to find out the max number of sounders required for what so ever.  

If I am wrong please feel free to correct me