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Thread: controls pics

  1. #1
    Join Date
    Dec 2004
    Location
    Puyallup,WA.
    Posts
    51
    The first pic is of an offcycle defrost timer and thermostat I built for a walk in cooler.

    The second pic is of a control to turn on/off a well water supply to pre-cool milk. I used a CT off the milk pump to operate a sprinkler valve. I have since changed the valve to an anti-contamination valve to make it NO in case of control failure.





    let me know if anyone has suggestions or coments.

  2. #2
    I have a question:

    Why do we have to keep milk cold? In the cow it keeps at very warm temps but not outside the cow?

    That has always bothered me...

    :-)

  3. #3
    Join Date
    Dec 2004
    Location
    Puyallup,WA.
    Posts
    51
    Originally posted by control_noob
    I have a question:

    Why do we have to keep milk cold? In the cow it keeps at very warm temps but not outside the cow?

    That has always bothered me...

    :-)

    It is all about quality. When milk leaves the cow it is around 98f it is important to cool it to around 38f as soon as possible to maintain low bacteria counts.

  4. #4
    Join Date
    Jul 2000
    Location
    Dallas,Texas
    Posts
    4,972
    Here in Texas, once the milk comes out of the cow it has to be chilled completely before it can be pumped to the truck for transport. They are pretty strict about the temp because the truck is just a big thermos.

    They will dump a whole truck load if the temp is not correct or a medicated cow's milk turns up in the batch.

    They try pretty hard to keep the milk safe for Americans.

    My hat is off to you coldmilk for the work you do.

  5. #5
    Originally posted by coldmilk
    Originally posted by control_noob
    I have a question:

    Why do we have to keep milk cold? In the cow it keeps at very warm temps but not outside the cow?

    That has always bothered me...

    :-)

    It is all about quality. When milk leaves the cow it is around 98f it is important to cool it to around 38f as soon as possible to maintain low bacteria counts.
    OK, cool, I worked on a dairy farm during high school and I'm familiar with cleaning the milker and the cow... I though the milk stayed free from bacteria during the trip, it must be pretty near impossible to keep it bacteria free though. Thanks for the reply. I miss milk straight from the cow, we would dip it straight from the bulk tank and pay by the pound... farmer sure got pissed if we took too much cream! Mmmmm.

  6. #6
    Join Date
    Jul 2004
    Location
    Southern Alabama
    Posts
    448
    The SmartRelay looks like the Pico PLC made by Allen-Bradley. I'm assuming that you can use the LCD screen to program the SmartRelay like the Pico and it uses ladder logic.

    With the low price for these micro PLCs and the functionality they provide, relay logic is really a thing of the past.


  7. #7
    Join Date
    Dec 2004
    Location
    Puyallup,WA.
    Posts
    51
    Originally posted by on call
    The SmartRelay looks like the Pico PLC made by Allen-Bradley. I'm assuming that you can use the LCD screen to program the SmartRelay like the Pico and it uses ladder logic.

    With the low price for these micro PLCs and the functionality they provide, relay logic is really a thing of the past.

    The smart relay is programmable from the LCD, although it is much easier to use a laptop. I have used these little guys for just about any type of control you can imagine. I7 and I8 are analog. For the price you couldnt go wrong. I have seen the Pico also they are pretty close.
    I have about 30 smart relays in use in the area for the last 18 months and no failures yet. Sorry I had one, but the installer ran his conduit in top of enclosure over the relay, yep H2o took it out.

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