Posted By Dave Wilson
Does anyone know where I can source a Negative Pressure Monitor for use to measure the differential from the inside and outside of an Asbestos working enclosure?

Posted By Dave Wilson
Errrr No!! Googling for What????

Why do EHO's not keep up with the times and ask for something which not only went out with the ARK but also out of Production and manufactureer gave up 15 years ago!!

I would assume that if you have enough Neggies to give at least 8 airchanges p/h within a working asbestos enclosure why would you want a pressure guage to 'see' that there is negative pressure?

So I say ok what is the acceptable negative pressure you require then? in mbars pascals or whatever

Response 'I dont know?'

OK then I say

Show me where in the Asbestos regs I have to install a -ve pressure monitor?

No reply came the response.

(for info I am an EHO so dont get all uppity!)

Posted By Dave Wilson
Is this the 'torchcross' thingy/

Posted By Smurfer
Dave

I can't tell you what the model is I'm afraid... it was 12 yrs ago!

Holy thread revival!
I know this was 10 years ago, but I'm doing a spot of research and as part of my searching around, this thread came up.
I guess it makes sense to fill in some missing gaps.

I work for the company that used to produce the Torchcross CMXe. It was an instrument that measured the difference in air pressure between to points and recorded that information to an SD card. The information was converted to Excel format in the instrument to make it compatible with most desktop PC's.
It had a number of other features that don't seem to have been marketed very well, and so not many people seem to be aware of them:
It had the ability to send a text to a number of phones, should the air pressure go above, or below a set level.
It could sound an external alarm (part of a kit) if the above occurred.
It could switch on a standby NPU if the above occurred.

A question was asked where there is a law referring to pressure monitoring. There is no "law" which specifies it, but there is best practice guidance.
HSG247 states on page 108 (Box 6.1) that:
" Visual inspection and smoke test before work starts.
Visual inspection before each shift, including checking the NPU pressure
gauge.
Additional checks with smoke tubes and pressure testing inside the enclosure
(daily if the building is occupied)."

PRESSURE TESTING INSIDE ENCLOSURE BEFORE EACH SHIFT

I'd like to clarify at this stage, that I design the plant that we manufacture now, so I'm having to learn the acts and statutes, industry best practice and individual company habits in order to be able to offer products that people will actually find useful. One of the products I am working on is a successor to the Torchcross. Unfortunately, the man responsible for the original design of the original unit passed away some time ago, and he took a lot of the design and knowledge with him.
I am pretty much starting from scratch.

Airflow is NOT tied to negative pressure!!
I can create an enclosure / air mover that will give you 100,000 air changes a SECOND with very little, or no air pressure difference. The air inlet (airlock) just has to be big enough.
Airflow (air changes) pull the fibres towards the filter on the NPU.
Negative pressure CONTROL the fibres (or rather, the air that transports them) by guaranteeing that the air only ever moves IN to the enclosure, never out.

I believe that the old Torchcross was a bit "clunky" and WAY too expensive. There are other alternatives of course, but they seem to be priced for profit, rather than industry and public safety.

Does anyone disagree with my comments?