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  • Temperature Dataloggers


    ==== UPDATE edit by Andy ====
    The QM 1538 is now available in BeanBay

    See the following thread for details.
    http://coffeesnobs.com.au/YaBB.pl?num=1190374516

    =======================


    [hr]

    Just wondering what type of dataloggers people are using to record their roasts?

    Ive looked at a DMM datalogger from Jaycar  

    http://www.jaycar.com.au/productView.asp?ID=QM1462&CATID=&keywords=data+log ger&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=& Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID =

    I went in today and talked to the sales people, who couldnt even tell me the recording intervals it was capable of, so naturally I didnt get it.  Spend the money on Beanbay instead.

    Does anyone know of anywhere else to look?

    Thanks
    Belinda

  • #2
    Re: Temperatue Dataloggers

    Belinda - I want one of those two - the Jaycar one looks ok but I also want to know more - if we can find out if they are any good we should get a group order going to get the $30 discount per unit.

    Comment


    • #3
      Re: Temperatue Dataloggers

      That might be an option Grendel. But I cant but help think there are better units suited for our purpose out there.

      We just have to find them :-)

      Im sure someone must know of them.


      Belinda

      Comment


      • #4
        Re: Temperatue Dataloggers

        Found this site which has some great looking ones, but a bit pricey

        http://www.pcwi.com.au/Digital-Thermometer-Probes.asp

        and the probes are separate too and costly.


        Belinda

        Comment


        • #5
          Re: Temperatue Dataloggers

          Originally posted by Corretto link=1159680974/0#2 date=1159690557
          But I cant but help think there are better units suited for our purpose out there.
          Belinda
          If you are looking at self contained units.... yes they are available- BUT you better be prepared to forgo several years coffee supplies (or the equivalent in dollars) to buy them! Mind you some of them even plot the results on a chart for you ;D

          Data loggers are a "special purpose" item and, like commercial coffee roasters, cost more than they are worth because of the specialist nature and low volume sales..... and dont necessarily work any better than a BM/heatgun ;D

          So the equivalent of a "Corretto" would be an anologue interface to a PC.... to which you connect a temp probe.....

          Now you could write an application to take this raw data from a thermocouple via the analogue to digital converter, correct for the offset (thermocouples read relative to absolute zero which is -273 deg C) and then scale the mV into temp.....

          or use something like the DMM which you have found.... and that does all the smarts for you and outputs the data via either USB or serial to a laptop....

          That is probably the most cost effective comprimise between cheap (and lots of work) and expensive and all self contained....

          EDIT: and if you are concerned about accuracy - I wouldnt be. Most sites where they talk about recording roast temps complain that it is either the bean mass, or the air in the roaster which is being monitored.... and it depends just where the probe is and how consistantly it is being touched by the beans and/or the air... so the readings which are obtained are comparative at best... (hopefully you can repeat it next time - more or less)

          The way to go is measure the temp inside a bean in the roaster..... so the experts say

          Is there anyone who can produce a bean with a telemetry transmitter at its center which sends out the data as it roasts ;D

          Comment


          • #6
            Re: Temperatue Dataloggers

            Enter the "Digi-Bean" (tm) your new home roasting friend.

            Comment


            • #7
              Re: Temperatue Dataloggers

              Good post JavaB, it about sums it up.

              I too have been sniffing around these options.

              I found some pretty cool USB interfaces for PCs that would take 4-8 thermocouple probes but they were expensive.

              At the other end of the scale at $55 is
              http://users.tpg.com.au/users/p8king/qm1538.htm
              which is dirt cheap if you can use the RS323 (serial) or add another $44 for a USB to Serial converter.

              Still might be worth talking to him about a bulk price if there are a few in market for one.

              Comment


              • #8
                Re: Temperatue Dataloggers

                if you are concerned about accuracy - I wouldnt be. Most sites where they talk about recording roast temps complain that it is either the bean mass, or the air in the roaster which is being monitored.... and it depends just where the probe is and how consistantly it is being touched by the beans and/or the air... so the readings which are obtained are comparative at best... (hopefully you can repeat it next time - more or less)

                The way to go is measure the temp inside a bean in the roaster..... so the experts say Wink

                Is there anyone who can produce a bean with a telemetry transmitter at its center which sends out the data as it roasts
                In the book on roasting by Kenneth Davids it has a few sketches of commercial roasters and their temperature probes are located amongst the beans. ie, the beans wizzing by hitting the probe.

                So yeah, accurracey doesnt have to be high. with 1 or 2 C Id say would be fine.

                Id like to see a bean with a camera inside too :-) Beancam ....


                Belinda

                Comment


                • #9
                  Re: Temperatue Dataloggers

                  Originally posted by Andy Freeman link=1159680974/0#6 date=1159696196
                  At the other end of the scale at $55 is
                  http://users.tpg.com.au/users/p8king/qm1538.htm
                  which is dirt cheap if you can use the RS323 (serial) or add another $44 for a USB to Serial converter.

                  Still might be worth talking to him about a bulk price if there are a few in market for one.
                  Andy,

                  That looks excellent..... Far easier to use than other analogue to digital converters etc and comes with the lot.... If you have an old laptop (with serial port) you dont even need to spend the extra $44...

                  Looks at his old laptop..... hey serial port- and not used (well mouse plugs in there but it has one of those little joy-buttons in the middle of the keypad!!) ;D

                  Comment


                  • #10
                    Re: Temperature Dataloggers

                    I saw this the other day Andy, but couldnt get back to it today.

                    So, what if you dont have a laptop? and the computer is at the other end of the house than where the roasting is done?

                    Is that where the QM5000 comes in?

                    Belinda

                    Comment


                    • #11
                      Re: Temperature Dataloggers

                      Originally posted by Corretto link=1159680974/0#9 date=1159697110
                      So, what if you dont have a laptop? and the computer is at the other end of the house than where the roasting is done?

                      Is that where the QM5000 comes in?

                      Belinda
                      Nope... unfortunately that also needs to connect to a computer/laptop......

                      All but the most expensive devices dont store the data in the device but pass it off (in real time) to a mass storage device (generally some type of computer).... Some expensive ones print the data out on a graph sheet rather than storing it - also in real time.

                      Laptops (and you dont need a real fast/expensive one) can be bought quite cheaply second hand..... and are probably a far better proposition than a desktop computer for this type of persuit.

                      Comment


                      • #12
                        Re: Temperature Dataloggers

                        Hmmmm, maybe I can get a 20 metre RS232 cable?? That could work.........

                        Comment


                        • #13
                          Re: Temperature Dataloggers

                          Originally posted by Corretto link=1159680974/0#11 date=1159705452
                          Hmmmm, maybe I can get a 20 metre RS232 cable?? That could work.........
                          Yep.... at the speed data is transferred .... should work OK....

                          Just dont trip over it whilst roasting... :

                          Either that....

                          or modify beans so they have something like those turkey "popper" temperature sensors built in.... they pop up when the internal temp of the bean is just right ;D

                          Comment


                          • #14
                            Re: Temperature Dataloggers

                            For those who havent got / dont want to buy a laptop for recording...

                            Have a look at :

                            http://users.tpg.com.au/users/p8king/qm1520.htm

                            and scroll down to Q1190....

                            It stores the data for 32000 events (samples) which you can download to a computer later....

                            The bad news is $330..... which I reakon is pretty good (mind you I think I paid $100 for the laptop which Id use....)

                            So $55 plus $100..... mmmmm... no guessing which way Id go

                            Comment


                            • #15
                              Re: Temperature Dataloggers

                              Originally posted by Corretto link=1159680974/0#11 date=1159705452
                              Hmmmm, maybe I can get a 20 metre RS232 cable??  That could work.........
                              The cheaper option is to buy a 20m network cable (CAT5) and a couple of RJ45 to DB9 serial adapters.

                              https://secure4.vivid-design.com.au/jaycar2005/productView.asp?ID=PA0906&CATID=&keywords=rj45&SPE CIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword 2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

                              You could run the cable through the roof or under the floor yourself... just dont run it beside any power cables.

                              Comment

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