Aspiration detectors

[kurnal]

Hi Dr Wiz

Any chance of a link or more info?
Are we talking about putting a standard point detector in a box and drawing the sampled atmosphere over it or have I gone off on one?

[Wiz]

Hi Dr Wiz

Any chance of a link or more info?
Are we talking about putting a standard point detector in a box and drawing the sampled atmosphere over it or have I gone off on one?

Hi back to you Professor K.

Always happy to help a buddy.

You understood correctly. The product description is as follows:

The ASD1/ASD2 aspiration systems actively draw air from the protected area through a network of 25mm pipes, which is then monitored by an internal conventional or analogue addressable smoke detector (not provided)

This would enable you, for example, keep the detector (of your own choice) out of a lift shaft, with just a pipe going into it.

The cost for an ASD1 is about £540.00.

The manufacturer's contact details can be found at:

www.eurofyre.co.uk

Their website is not up and running yet but they sent me details of the prouduct a few months ago.

[afterburner]

We have a small application of just a system in operation. 25mm pipework draws air from a number of small occupied rooms out to a sealed chamber and over a 'normal' smoke detector within the chamber. The actual installation has a sample pipe to each room, and the sealed chamber box is segregated to contain one detector per room.
The chamber box has a small powered fan which draws the sampled air into the chambers. All the detectors are addressed in the normal way into the system.
Reason  for installation was to prevent very high levels of vandalism if the detectors were inside the rooms.
Has worked fine since installation

[kurnal]

It sounds a great solution for some specific problems and I am very keen to find out more.

I feel uneasy about the concept of using it to protect a number of rooms for life safety- even to extend the coverage of the point detector in the box beyond the normal 100m2 but for property protection thats another thing perhaps.
The gut feeling is that if we do cover a large area then the airflow across that detector would probably result in its getting dirty much faster than one used in the conventional manner - and whilst vesda do cover huge areas they are designed for this and the air is filtered of course.
Or am I being over cautious?
The cost of the box being what it is will reduce the risk of it being abused in any case.

[David Rooney]

Further to Graeme's and Thebeardedyorkshireman's posts I can confirm that I have also successfully used aspirating detection to cover rooms rather than just cabinets.

There is also now a very cost-effective Vds approved aspirating product available that allows you to use the automatic fire detectors of your choice in the sensing chamber, and air is sucked in from your protected area and then sampled. I am considering using this in shafts and risers so that no access by engineers is required into the top of the shaft for installation and maintenance.

I've seen a Siemens version of this - basically a fan in a box with a detector head mounted inside, with your normal run of pipe etc.

- so in this system is the air flow monitored ?

- what about the affects of dilution or do you up the sensitivity of the detector ?

[Wiz]

I agree with Kurnal that when using this type of device then one normal smoke detector shouldn't cover more than one room to avoid possible smoke dilution. I'm sure that this particular version is only meant to cover one area.

With respect to dust, the literature describes it has having a 'Field Serviceable air filter' and suggests it is suitable for 'harsh and dirty IP65 rated environments......in hospitals....in racing stables'

With respect to air flow monitoring  the literature says ' The flow level is adjusted on a 10 element bar graph with adjustments for high and low thresholds. Flow failure is reported as a device fault'.

I must confirm that I have not used this model myself yet, but it caught my eye as being a cost-effective alternative to a traditional aspirating system for suitable single area applications. I was thinking of lift shafts and risers but it would surely be suitable for rooms that would normally be covered by a single smoke detector and where a detector couldn't be installed because of vandalism/asthetics.

I would encourage anyone who is interested, to obtain the product literature from the manufacturers. I am not really in a position to answer in-depth answers to questions regarding a product that I have not even used yet!

[David Rooney]

Hi Dr Wiz

Any chance of a link or more info?
Are we talking about putting a standard point detector in a box and drawing the sampled atmosphere over it or have I gone off on one?

Hi back to you Professor K.

Always happy to help a buddy.

You understood correctly. The product description is as follows:

The ASD1/ASD2 aspiration systems actively draw air from the protected area through a network of 25mm pipes, which is then monitored by an internal conventional or analogue addressable smoke detector (not provided)

This would enable you, for example, keep the detector (of your own choice) out of a lift shaft, with just a pipe going into it.

The cost for an ASD1 is about £540.00.

The manufacturer's contact details can be found at:

www.eurofyre.co.uk

Their website is not up and running yet but they sent me details of the prouduct a few months ago.

Blimey, for that money you can buy a real HSSD from Stratos - micra 25 !

[kurnal]

Can anyone give a  ballpark for installation  of a micra 25 and provision of an interface box for later connection to an existing system- to be connected by others- for a single one of these units in a small room say 12 x4x3m? Just in very roundabout figures or even just a guess at  time to install and commission assuming power available and straightforward job- its not an auction I am just curious.

[Thebeardedyorkshireman]

Kurnal
We have done hundreds of these. The cost of the aspirator,detector, power supply ,batteries and interface including commissioning is around £1k selling each. Say £350 for a days labour to bolt it all together inc pipe and fittings.
Variables are the type of detector, type of interface and its cheaper per room if you use the 2 detector box.
Dave