Probably don't want to upset the buyer and getting complaint. The one I ordered, link to the sales page no longer works. Will ask for a refund.
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(Coronavirus) On UV Sanitization
- Thread starter AudubonB
- Start date
Probably don't want to upset the buyer and getting complaint. The one I ordered, link to the sales page no longer works. Will ask for a refund.
linux-works
Active Member
I wonder what the actual cost of those corncobs were. the markup was very high and I jumped in during the initial panic-buy. I was right to buy the glass bulbs, as many are now out of stock, but the led ones - we'll have to read about this in history, once it gets written. I bet there's a story behind this that's worth hearing.
I do feel bad for the sellers caught in the middle. if you are going to ask for a refund, do it sooner rather than later and not wait.
I do feel bad for the sellers caught in the middle. if you are going to ask for a refund, do it sooner rather than later and not wait.
linux-works
Active Member
for those that have an amazon prime account, I suggest using the 'help' link at the bottom of amazon's page and navigate thru the 'call me on the phone' option. its there but you have to work to find it, sometimes.
I'm going to call, have a chat with a real person (if you are Prime, you can always reach someone real) and try to explain that this whole set of product is fraudulent and dangerious and should be removed entirely from the site.
if more people actually call and explain this to the CS rep, I think it will reach critical mass and they'll have to investigate the whole thing. I'm hoping we can get these removed from the market, as a placebo is really dangerous.
the 'community' has to police itself, since, well, no one else seems to care enough...
I'm going to call, have a chat with a real person (if you are Prime, you can always reach someone real) and try to explain that this whole set of product is fraudulent and dangerious and should be removed entirely from the site.
if more people actually call and explain this to the CS rep, I think it will reach critical mass and they'll have to investigate the whole thing. I'm hoping we can get these removed from the market, as a placebo is really dangerous.
the 'community' has to police itself, since, well, no one else seems to care enough...
Inspect USA Data Logging UVC Ultra Violet Light Meter (UVC-254SD)
This company confirmed when I called that they had them in stock and shipped the same day. They did say they were running low, so call before you order.
https://www.amazon.com/gp/product/B085JPG789/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
Bulbs I purchased that are arriving Saturday.
linux-works
Active Member
that looks like a decently long bulb. balast and all. looks like the bulb base plugs right into the black box?
I have this on order:
https://www.amazon.com/gp/product/B01CV2W12E/
I like that its 12vdc; so I can easily switch it on and off, safely, likely with a simple SSR, under cpu control.
2 of those bulbs can be in the box; maybe one on the top of the box and one on the side; I will still use the motor turntable so that things get exposure from all sides.
that vendor shipped fast; will report how well it went (not amazon prime, just amazon seller).
I have this on order:
https://www.amazon.com/gp/product/B01CV2W12E/
I like that its 12vdc; so I can easily switch it on and off, safely, likely with a simple SSR, under cpu control.
2 of those bulbs can be in the box; maybe one on the top of the box and one on the side; I will still use the motor turntable so that things get exposure from all sides.
that vendor shipped fast; will report how well it went (not amazon prime, just amazon seller).
dqd88
Member
Battelle is using hydrogen peroxide vapor to decontaminate N95 masks.
UV is probably not ideal for masks as it may damage them.
Hospitals use autoclave, which is super heated steam under pressure. If it were me, I would probably try to use steam. Maybe try one of those steamer pots used for food. Steam the mask then let dry. Trick is to find optimal temp. Autoclave does 132 C / 270 F for about 20 mins.
deonb
Active Member
linux-works
Active Member
when I get a stack of masks, I'm going to mark them as up, down, top, bottom, strange and charm.
..yeah, been watching too much educational tv lately. lol
deonb
Active Member
Ditto on the order.
What's your plan for measuring that S10GD? It outputs in the nano-amp range - I don't think even my bench scope can pick that up. Some sort of op-amp in front of it?
linux-works
Active Member
comparing the specs of the guva-s12sd (which the adafruit and clones use) and the guvc-s10gd, the uvc sensor puts out about half the current compared to the uva.
it looks like I can just unsolder a uva diode from a clone, put this in and get at least half scale out for full scale 'intensity'.
the parts came in yesterday! I'm actually short on the breakout boards and I want those op-amps and gain stages to be board-and-trace-based and not green-wire based
the purple generic breakout boards are sold out and only the slow boat versions seem to be available. I ordered 5 or 10 of those but they wont be here for a while, and I don't want to butcher the generic purple board I do have, now.
the eevblog guy has a microcurrent box. I have one of those but never got a chance to use it; it might be useful.
I don't know if a 'high end' op amp is needed but, yes, SOME gain stage is needed. if you are trying to make a real meter, you'll want the cleanest and quietest gain stage you can get (instrumentation amp, so 3 op amps, at least) - but for my use, just checking of uvc is 'working', even a sloppy gain stage will work.
my current sensor board has 2 analog slots and they are both taken by the uva sensor, one on adafruit and one generic. when I get more of one of them (adafruit is on the way, too), I will transplant one of my digikey valuable uvc sensors and do a test run.
BTW: can anyone recommend safety glasses for uvc? I need goggles that go over glasses; all the ones I see are in place of glasses.
deonb
Active Member
linux-works
Active Member
when I ordered from adafruit, they were open, at least taking orders and shipping when they could.
I got one from amazon a month or so, ago, when the 'craze' was first starting to happen. got 2 generics, but ruined one (that will teach me not to follow Some Random Dude(tm)'s web page). I have 10 or so from adafruit on order, but not sure when they'll get here. I can try using one of theirs for transplanting, too, but they are so well made, I hate to ruin them
I got one from amazon a month or so, ago, when the 'craze' was first starting to happen. got 2 generics, but ruined one (that will teach me not to follow Some Random Dude(tm)'s web page). I have 10 or so from adafruit on order, but not sure when they'll get here. I can try using one of theirs for transplanting, too, but they are so well made, I hate to ruin them
deonb
Active Member
when I ordered from adafruit, they were open, at least taking orders and shipping when they could.
I got one from amazon a month or so, ago, when the 'craze' was first starting to happen. got 2 generics, but ruined one (that will teach me not to follow Some Random Dude(tm)'s web page). I have 10 or so from adafruit on order, but not sure when they'll get here. I can try using one of theirs for transplanting, too, but they are so well made, I hate to ruin them
Ahh ok. Is the op-amp you have on your generic also a MCP6001?
N5329K
Active Member
linux-works
Active Member
N5329K
Active Member
Just arrived today and it's working great. Had a remote control and 15, 30, and 50 minute timer function.
Yes, the bulb plugs right into the box, which is the ballast and all the needed electronics in one nice, neat package. Pretty darn happy with it.
So, I finally finished the build of my UV-C disinfecting box. Here's some images and details.
Parts and tools needed:
Overall view of box:
Closeup of inside with bulb (on right) and standoffs.
Showing 18 mw/cm2 with sensor on top of the bulb. I tend to get around 10 mw/cm2 on the leading edge of a package occupying about 3/5 of the volume of the box, and about .15 to ..20 on the furthest point on the shadow side of the box (via reflection).
The electronics/light mount on the outside of the box.
Closeup of the standoffs.
Parts and tools needed:
- Igloo ice chest
- UV-C bulb (https://www.amazon.com/gp/product/B085JPG789/ref=ask_ql_qh_dp_hza?th=1)
- Aluminum foil
- Hot glue gun and glue sticks
- Closet door guides (Prime-Line Tan Bypass Closet Door Guide-N 7527 - The Home Depot or similar)
Overall view of box:
Closeup of inside with bulb (on right) and standoffs.
Showing 18 mw/cm2 with sensor on top of the bulb. I tend to get around 10 mw/cm2 on the leading edge of a package occupying about 3/5 of the volume of the box, and about .15 to ..20 on the furthest point on the shadow side of the box (via reflection).
The electronics/light mount on the outside of the box.
Closeup of the standoffs.
linux-works
Active Member
this breakout board is still in stock:
https://www.amazon.com/gp/product/B00VYA0AUK
same basic thing as the purple generic clone.
the uv sensor can be removed with some unsoldering skill and the uvC sensor put in its place.
the circuit can be tweaked if you need to change the feedback to/from 1M or 10M, although 10M is a bit high for my likes.
btw, the adafruit sensor uses a single op-amp stage and the purple (and this one) use two. the purple one shows a much higher output for a 6w (example) uvc light. I still am going to use a mix of 2 or even 3 sensors, but the adafruit one does not swing as much value in its as-shipped config.
https://www.amazon.com/gp/product/B00VYA0AUK
same basic thing as the purple generic clone.
the uv sensor can be removed with some unsoldering skill and the uvC sensor put in its place.
the circuit can be tweaked if you need to change the feedback to/from 1M or 10M, although 10M is a bit high for my likes.
btw, the adafruit sensor uses a single op-amp stage and the purple (and this one) use two. the purple one shows a much higher output for a 6w (example) uvc light. I still am going to use a mix of 2 or even 3 sensors, but the adafruit one does not swing as much value in its as-shipped config.
Since I have the meter now, I ordered one of these potentially fake corn bulbs to see if it's legit:
https://www.amazon.com/gp/product/B086GF68Q7/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B086GF68Q7/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
