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Posted By ian mcnally
Good morning,
Before the wise cracks I must say I do not consider this much of a health risk but we are keen to demonstrate compliance with best practice and for this reason we need to tick this particular box.
On checking the website there is a wide range of such testers available, can anyone out there recommend a particular type of microwave leak tester. It will be used by our in house electrician who will be carrying out this role while he does the PA testing of other equipment at various sites.
Thanks for any help you can offer
Ian
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Posted By John Murgatroyd
Don't bother. Just inspect the door seal to make sure it is a good fit. All m/wave ovens have detectable leaks. If the door seal is damaged, junk the oven and buy another. Problem solved.
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Posted By Richie
Apollo Ltd. are well recognised and respected regarding microwave leakage monitoring. Narda are also well respected regarding RF leakage.
John is correct in his assertion regarding leakage from domestic microwaves however. Physical checks are the order of the day these days, any faults - just junk the oven and buy another.
I have lost count of the nuber of microwaves I have checked for leakage, only two ever failed - both the same industrial model with vertical sliding doors.
None of these monitors are particularly cheap, and any monitor worth it's salt will need calibrating annually. Again, not cheap. Of course you can always rent, but in the cold light of day I would say it was on the expensive side of 'reasonably practicable'.
Richie
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Posted By Crim
Microwave radiation is known to cause cataracts, birth defects, cancer, and other serious health problems including nervous system damage, headaches, and pacemaker interference.
This is the opening comment from a leak detector supplier on the internet.
I post this as I firmly believe micro wave radiation is a potential killer.
Please have a re-think about your initial comment and do take it more seriously!
I do mean well and point you toward google - just type in micro wave leak detector and you will get loads of companies to try.
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Posted By Jack
Crim, I think you're confusing hazard with risk.
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Posted By ian mcnally
Hi Guys,
I guess you just can’t win can you!
I tried to demonstrate to my fellow practitioners that I’m not a complete clipboard saddo by suggesting the problem was not much of a health risk. Thanks to Ritchie for your views, I suspect these may have also been helpful to others viewing, I will check out the Apollo route.
I must add that in response to my request one comment suggests I do a visual inspection of the seals, unless you have bionic eyes I doubt this is going to help much when you turn the thing on and trying to demonstrate the latter as an acceptable control to an Auditor could be interesting.
Crim tells me I should take it more seriously and proceeded to raise my awareness of the hazards, thanks for that Crim! just as well I’m not too sensitive. Perhaps the risks are better documented than I first thought, could you refer me to your source of recorded incident rates so I can bring myself up to speed on this.
To suggest I goggle it was perhaps less useful, obviously I have Internet access and I did mention “on checking the website” What I was looking for was advice on types not where to find them. I guess you must have scanned it too quickly to make that connection.
Just after posting the email I left to attend an IOSH South Downs Branch Health care specialist group meeting that was being held locally. The meeting was attended by friendly and knowledgeable safety people. I found it very useful and during which two members kindly offered to provide me with different brand names and models that they use and can recommend. That was really all I needed. If anyone would like the information I collect do email me.
Keep the good work
Ian
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Posted By Jack
Re your critique of John Murgatroyd's posting ie 'unless you have bionic eyes I doubt this is going to help much when you turn the thing on and trying to demonstrate the latter as an acceptable control to an Auditor could be interesting' I wouldn't dismiss it quite so lightly.
A while ago (early to mid 1980's) the HSE had one of its then guidance notes on the topic. That made the point that it was not necessary to routinely check microwave ovens for leakage (ie it was not reasonably practicable) but that employers should ensure door seals were intact and the surfaces between the door & the oven were free from crud.
That guidance note is no more but there is an LAC which says 'The incidence rate to date for injuries arising at microwave ovens from exposure to microwave radiation appears minimal and derives almost entirely from reports published in the USA. However, inspection has shown that lack of cleanliness and poor maintenance of door seals on ovens can lead to leakage in excess of the recommended limit.'
Many employers did check for leakage in the early 80s but a lot - certainly the one I worked for at the time - discontinued following the HSE GN. The same GN also pointed out that the testers most were using were virtually useless! There were good ones around but they were expensive.
Most EHOs will have testers (at least they used to) so if you really want to carry out the checks might be worth asking your local EHO department what they use.
PS I like the idea of a critique of the replies received! Very helpful.
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Posted By ian mcnally
Hi Jack,
Thanks for your posting, useful info and tip.
I didn’t really get into safety until the early 90’s and remember even then the lecturers saying the only real risk of MW leakage was due to door seals so I do accept user checks would be sensible in principle.
We will be incorporating such visual checks as part of our standard safety inspections as these will only take seconds to carry out. The main reason for the sudden desire to be able to demonstrate leaks checks has arisen from an audit that failed us on the grounds we could not demonstrate we had leak tested the equipment. I won’t tell you my initial comments since the vast majority of microwaves used are nearly all less than 12 months old and after each project is completed the microwaves normally find other homes rather than skipped. Big on the 3 R’s, yes I’m sure there could be a risk even when brand new!
On reflection the poor old auditor had a process to follow so there it is. Next call my local friendly EHO!
Have a good weekend all
Ian
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Posted By Jim Walker
When I had a rubbish employer and was poor, I used to supplement my income PAT testing.
As a "freebee" I'd used a microwave leak tester, the equipment always leaked.
I'd show the client the meter jumping all over the place and they would say "oh dear! does that mean we need a new machine?".
"Leave it with me mate, I'll sort it out!" I'd say.
Once they were out of the way I'd give the seal a good clean and remove food residues stuck on the inside of the door.
Retest in front of client; no leaks, grateful customer, plenty of recommendations.
I think the meter cost me a fiver and was worth its weight in gold.
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Posted By ian mcnally
Hi Jack & Jim,
Thanks for your posting, useful info and tip.
I didn’t really get into safety until the early 90’s and remember even then the lecturers saying the only real risk of MW leakage was due to door seals so I do accept user checks would be sensible in principle.
We will be incorporating such visual checks as part of our standard safety inspections as these will only take seconds to carry out. The main reason for the sudden desire to be able to demonstrate leaks checks has arisen from an audit that failed us on the grounds we could not demonstrate we had leak tested the equipment. I won’t tell you my initial comments since the vast majority of microwaves used are nearly all less than 12 months old and after each project is completed the microwaves normally find other homes rather than skipped. Big on the 3 R’s, yes I’m sure there could be a risk even when brand new!
On reflection the poor old auditor had a process to follow so there it is. Next call my local friendly EHO!
Have a good weekend all
Ian
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Posted By Adrian Watson
The health hazard from microwave ovens is results from heating up susceptible organs; eyes and gonads. The risk of this occurring is extremely low.
A visual examination and inspection of microwave ovens is all that is required to ensure seals are in place, the door closes and interlocks function correctly.
Regards Adrian Watson
P.S. Working in close proximity to microwave antenna is something else!
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Posted By John Murgatroyd
Most of the m/wave testers you will buy for less than 20 quid consist of nothing more complex than a probe connected to a diode and a capacitor.....display of the "signal" is by a cheap moving-coil meter, or an led "bar". Equally cheap.
These will confidently show you that your m/wave oven is bombarding you with dangerous radiation.....they will also tell you the same when put near an operating mobile phone....and a television crt. They will tell you this even when the amount of leaked radiation is so low that it would take a month to warm a drop of water.
In fact, try as I may...and I can be very trying....I can find nothing on the net about the thousands of people rendered blind, deaf, dumb, sterile or dead from domestic m/wave ovens....noted a few cats, hamsters and mice...but no people.
Another storm in a H&S teacup (temperature regulated to a constant and harmless (and undrinkable) 34 degress centigrade )
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Posted By Martin C
Mid seventies I worked on Saturdays and out side school term in a department store cafeteria. They had a microwave oven long before they were common in homes. The ladies who served on the counter put items in and set the time, the timer was clockwork so they set it roughly where it wanted to be. They were in the habit of stopping the oven to remove the contents by opening the door before it had timed out, relying on the door interlock. One day it failed and a woman put her hand in whilst the microwaves were still being transmitted. The result was pain and blisters and a change in practice.
The moral of this story is that bad practice with a microwave oven could be a bigger hazard than leakage past the seals. Outside private homes microwave ovens should be regularly cleaned and inspected and records of this kept. Frequency should be based on use. The risk from leakage is a function of proximity and time. Don't stand over the oven when it is working and the inverse square law applies to the exposure to any leakage. Low use operators are probably at low risk. Scalding due to overheated liquids is probably a bigger hazard.
Hazards from a microwave: Fire due to overheating solids, scalding due to overheating liquids, burns due to faulty door interlock, fire due to electrical fault are all more likely than problems due to leakage.
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