Electronics Lab Philippines

Share: Unusual Water Heater find

Offline Super zHero

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Share: Unusual Water Heater find
« on: August 19, 2013, 03:15:02 PM »
I was looking for a simple, small, filament (or element) type water heater that are dunked in coffee mugs to heat or warm up coffee or water in them.  I couldn't find any at SM, Ace or appliance stores but I found this instead:



It's encased in welded stainless steel.  Size approx 75mm in dia x 27mm thick.  There are no filaments.  There are two isolated stainless steel discs inside, each connected to each prong of the AC plug.  There is no continuity or Ohms reading on the plug, I checked.  I also check the discs which are accessible thru the holes to my meter probes and the AC plug, that's how I found out.

The good thing about this is- when it's out of the water, there is no electrical consumption.  When it's in the water, you might possibly get a shock when you touch the water.  It also boils pretty quickly.  800W daw.  I measured 6A rms at 230V.

I have a project which I'll follow up on this thread.

Offline Born2BeWired

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Re: Share: Unusual Water Heater find
« Reply #1 on: August 19, 2013, 03:32:59 PM »
Sir, you are exposing yourself to risk of electric shock in using. Unsafe ang mga yan. Yung mga hot/live electrodes are directly in contact with the water, ginagamit ang conductivity ng tap water para sa ohmic resistance heating.
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Offline rdpzycho

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Re: Share: Unusual Water Heater find
« Reply #2 on: August 19, 2013, 03:39:42 PM »
'yan ang karaniwang ginagamit sir sa mga siomai stands na merong linya ng kuryente, pero 'yung plastic ang katawan.

some stall owners put "Warning: Electric Shock" signs on their stalls.

High School ako nung una ako nakakita ng mga ganyang heaters sa Recto. may kaklase ako na nagdala ng ganyan sa retreat, hinawakan niya 'yung tubig para malaman kung mainit na, ayun, nagising kaming lahat. :D
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Offline insomartin

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Re: Share: Unusual Water Heater find
« Reply #3 on: August 19, 2013, 03:42:35 PM »
ito gamit ko. at one time hiniram sakin yung heater ko. mag papainit nang tubig para sa cup noodles.
sinaksak nya na wala pang tubig yung bowl... na amused sya kasi bright red yung element tas namatay.  :'(
ARggggh


Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #4 on: August 19, 2013, 03:55:06 PM »
Iyan nga kay Inso ang hinahanap ko.  Yun pala ay nagsusuper-Nova  ;D

Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #5 on: August 19, 2013, 05:44:59 PM »
Ito ang kinapuyat last night.  I have this Viconics R811-211 SSR which I'd like to use for this project.  To test it, I hooked it up like this:

Ang anak ng tinapa, kahit shorted yung control input, conducting pa rin yung SSR  >:(  umiilaw yung small bulb hindi nga lang full brightness.  Kung aalsin ko yung short at lalagyan ko ng 3+Vdc yung control, full bright yung ilaw.  I also hooked up my O-scope across the secondary, sure enough talagang mi sine wave.  Kung iso-short ko yung secondary, lumiliit yung voltage pero hindi pa rin zero.

I know that my SSR is good and that it has a minimum load for it to work.  My problem is wala akong makita sa net na specs for this SSR.  If anybody can find it, can you please pass it along....

Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #6 on: August 19, 2013, 06:01:29 PM »
I took out the xfmr from the circuit and put in a 220V night light here.

It works, so alam ko na nasatisfy yung minimum current flowing thru the Triac of the SSR to turn it off.  Kinda ironic  :-\  I imagine it's not the current flow but the impedance across the Triac that's important here.  Comments anyone?

Now I can turn it On & Off with my control voltage.

This is not the first time I've used SSRs but this is the first time I've actually looked at its workings.

Offline rage3657

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Re: Share: Unusual Water Heater find
« Reply #7 on: August 19, 2013, 06:09:41 PM »
I was looking for a simple, small, filament (or element) type water heater that are dunked in coffee mugs to heat or warm up coffee or water in them.  I couldn't find any at SM, Ace or appliance stores but I found this instead:



It's encased in welded stainless steel.  Size approx 75mm in dia x 27mm thick.  There are no filaments.  There are two isolated stainless steel discs inside, each connected to each prong of the AC plug.  There is no continuity or Ohms reading on the plug, I checked.  I also check the discs which are accessible thru the holes to my meter probes and the AC plug, that's how I found out.

The good thing about this is- when it's out of the water, there is no electrical consumption.  When it's in the water, you might possibly get a shock when you touch the water.  It also boils pretty quickly.  800W daw.  I measured 6A rms at 230V.

I have a project which I'll follow up on this thread.

ginawa lang namin yan sir dati.. dalawang kutsarang pinitpit para staright then nilagyan ng insulator between them screw each wire to each kutsara handle may water hetaer na, tamang tama sa isang glass wag lang gagamit ng metal na baso. :)

bong

Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #8 on: August 19, 2013, 06:25:44 PM »
Dalawang kutsara..... Very inventive!

Very dangerous din.

Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #9 on: August 19, 2013, 06:37:47 PM »
Now, I tried this with my Stainless Steel heater, and it works.

Short burst of control voltage on the SSR input controls the heat.  I'm halfway there.  Now I'm thinking of using two SSRs, one for each line so both lines can be turned off by same control signal.

Off course I can make my own SSR- two triacs with one opto controller (maybe, maybe not).  The water is still at a dangerous potential.  Abangan....

Offline mint25

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Re: Share: Unusual Water Heater find
« Reply #10 on: August 19, 2013, 07:56:30 PM »
Naalala ko sa ganyan klase ng water heater kapag kulo na ng kulo ung tubig at hindi mo i unplug tataas ng
husto current hanggat uminit at lalambot ang AC cord.
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Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #11 on: August 19, 2013, 08:31:58 PM »
Kaya maganda kung makakagawa tayo ng simple temperature controller para dito.  I'm thinking of SSR o kaya'y Triac with MOC306x Optoisolator with Zero x'ing, and a 555 pulser.

A thermistor can be used as a sensor.  Pwede rin diode, Transistor for a sensor pero medyo complicated ang circuit.

Offline Johannah Aleksandria

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Re: Share: Unusual Water Heater find
« Reply #12 on: August 19, 2013, 11:19:39 PM »





gumamit ako nito, yung plastic ang case, na ang tubig ay nasa timba'ng stainless, wala nmang kuryente. pag nalublob sa tubig bago isaksak, di yata mpupunta pa sayo yung kuryente.

Naalala ko yung kwento tungkol sa silya elektrika. Bago isinalang yung kriminal, pinakain muna sya. omorder sya ng maraming kutsara. ang ginawa nya, nilunok nya yung mga kutsara. Nung isinalang na sya, pag on ng switch, hindi nkayanan ng power source, nag trip. kaya nakaiwas sya sa kamatayan.
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Offline rdpzycho

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Re: Share: Unusual Water Heater find
« Reply #13 on: August 19, 2013, 11:59:43 PM »
makukuryente ka lang naman kung malapit 'yung heater sa hahawakan lalo na kung ilulubog 'yung kamay.

'yung sa mga nagtitinda ng siomai medyo malakas makakiliti dahil napupuno ng contaminants 'yung tubig kaya bumababa resistance.
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
- Clayton Paul

Offline insomartin

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Re: Share: Unusual Water Heater find
« Reply #14 on: August 20, 2013, 12:12:20 AM »
naka kita din ako nang high power transistor. water cooled, may rubber hose as insulator nung nakita ko yung manual. pang isolate sa water loop.

Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #15 on: August 20, 2013, 01:11:14 AM »
Naalala ko yung kwento tungkol sa silya elektrika. Bago isinalang yung kriminal, pinakain muna sya. omorder sya ng maraming kutsara. ang ginawa nya, nilunok nya yung mga kutsara. Nung isinalang na sya, pag on ng switch, hindi nkayanan ng power source, nag trip. kaya nakaiwas sya sa kamatayan.
Namatay din siya....... nung gumamit ng kubeta, hindi kinaya yung paglabas ng mga kutsara!  ;D

Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #16 on: April 22, 2015, 10:04:27 PM »
Up ko lang.
Ang hirap kasi hanapin.  I will do a follow-up on this project soon.

Offline >>>^żżż^<<<

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Re: Share: Unusual Water Heater find
« Reply #17 on: April 22, 2015, 10:25:49 PM »
Gamit ka na lang sir ng water heater kung pampaligo yung a 3.5kw sa banyo.  ::)
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Offline Super zHero

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Re: Share: Unusual Water Heater find
« Reply #18 on: April 22, 2015, 10:41:29 PM »
Ire-ressurrect ko sana yung dating Bhagwan water heaters pero with electronic controls using SSR.  Aim is not to exceed 800W.

Ni-test ko kanina itong featured stainless water heater, and it can reach constant 40 deg C with running cold tap water modulating the SSR.

Offline kmb36td

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Re: Share: Unusual Water Heater find
« Reply #19 on: April 23, 2015, 01:53:33 AM »
electrolysis?