Looking for120vac thermostat and relay

Swimming pool supply store. My pump controller turns on the pump when temperatures approach freezing. ...Jim Thompson

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| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

      Remember: Once you go over the hill, you pick up speed

Thanks, I'll look into those. Mikek

I looked, they will do the job in one fell swoop, but cost is to high. Thanks, Mikek

The more durable (typically) sort of water-sensing thermostats (aquastats), since you specify "must be able to be waterproofed" have a capillary and sensing bulb to stick in the water and the rest of it is located in a dry location. The dry location can be something like a NEMA exterior rated box if it's more "putting it out in the weather" rather than "putting it underwater" situation. Attempting to directly waterproof a thermostat rather than using a rated enclosure would make your frequent failures non-surprising.

The surplus place I had gotten some nice heavy-duty relays from is now out of them, too bad. That's surplus. Try to find one rated for MORE than 1HP at 120 (or rewire the motor application to 240, where it will be easier to find a relay rated for more than 1HP at 240V) for longer relay life.

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Cats, coffee, chocolate...vices to live by

Roll your own. With one of those National Temp Sensor chips, and drive a relay.

And value your own time. I'm finding it's often more economical to buy than spend a lot of time fabricating your own gimmick. ...Jim Thompson

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| James E.Thompson, CTO                            |    mens     |
| Analog Innovations, Inc.                         |     et      |
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
| Phoenix, Arizona  85048    Skype: Contacts Only  |             |
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  |
| E-mail Icon at http://www.analog-innovations.com |    1962     |

      Remember: Once you go over the hill, you pick up speed

In Arizona ?

Jamie

Yes, it's desert, which can get _amazingly_ cold at night. I'm in So. Cal, and a couple of winters ago I actually saw ice on the sidewalk one morning. Luckily, being a Minnesot'n, I know how to walk over ice; I saw some passerby almost fall on his butt, and I almost felt guilty for finding that so amusing. ;-)

Cheers! Rich

Google Klixon.

Cheers! Rich

When I needed a fail-safe thermostat to keep my greenhouse frost-free, I used a refrigerator thermostat to operate a relay which switched on a fan heater. The adjustable control could be mounted in a waterproof container if necessary, with the copper sensing tube outside. If the thermostat fails it will usually go open-circuit, cutting off power to the relay, whose normally-closed contacts then switch on the heating.

FWIW, this system has been operating for nearly 12 years without problem.

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Jeff

That's basically what I'm doing. I'm using this thermostat,

|2E399&N=0&sst=subset and drive a relay that turns on a water pump. I use the heat in the water to keep my greenhouse from freezing. I put the thermostat in a pvc pail with a lid and the bulb slips through a hole. The thermostat never gets wet or even damp, but I'm on my fourth in 15 years. I was looking for a cheaper setup to make for my nephew. So far nothing the only thing I have found is the swimming pool freeze protection thermostat at $32 with free shipping. Mikek

That is a thermostatically controlled 15 amp outlet. Turns on at ~35 degrees F, and off at ~45 degrees. $12.95

Ed

That is very close, The differential is to much. I may but one just to see if I could modify it. Thanks, Mikek

|2E399&N=0&sst=subset

I thought spares were cheaper in the US than here in the UK! See here (£1.00 ~ $1.63):

May be worth the shipping cost...

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Jeff