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Measuring oxygen in water — Parallax Forums

Measuring oxygen in water

ArchiverArchiver Posts: 46,084
edited 2000-12-19 23:49 in General Discussion
Hello,

IS there an inexpensive device that will measure
oxygen level in water? Of course I would like to
output the signal to the BS2.

Thanks,

Todd

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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 16:38
    isn't there 2 hydrogen molecules per 1 oxygen molecule ? or does water have
    an extra amount oxygen ?

    richard

    Original Message
    From: "Todd Botner" <contacttodd@y...>
    To: <basicstamps@egroups.com>
    Sent: Tuesday, December 19, 2000 10:10 AM
    Subject: [noparse][[/noparse]basicstamps] Measuring oxygen in water


    > Hello,
    >
    > IS there an inexpensive device that will measure
    > oxygen level in water? Of course I would like to
    > output the signal to the BS2.
    >
    > Thanks,
    >
    > Todd
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Yahoo! Shopping - Thousands of Stores. Millions of Products.
    > http://shopping.yahoo.com/
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 16:43
    It is similar to a fishtank. You can aerate the water. Pure water is
    almost never found. There are always minerals and other "stuff" dissolved
    in the water that allows it to hold more oxygen.

    Eric
    Original Message
    From: dakota [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Lke_gR94bHCwmVkJbJG0fuh9B0QCV893gf_KmloAE120aqWGyBerdnXbgyFajVaA0LZ7epegh65tF6h6VFitWyOhHg4]rfriedrich@i...[/url
    Sent: Tuesday, December 19, 2000 10:39 AM
    To: basicstamps@egroups.com
    Subject: Re: [noparse][[/noparse]basicstamps] Measuring oxygen in water


    isn't there 2 hydrogen molecules per 1 oxygen molecule ? or does water have
    an extra amount oxygen ?

    richard

    Original Message
    From: "Todd Botner" <contacttodd@y...>
    To: <basicstamps@egroups.com>
    Sent: Tuesday, December 19, 2000 10:10 AM
    Subject: [noparse][[/noparse]basicstamps] Measuring oxygen in water


    > Hello,
    >
    > IS there an inexpensive device that will measure
    > oxygen level in water? Of course I would like to
    > output the signal to the BS2.
    >
    > Thanks,
    >
    > Todd
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Yahoo! Shopping - Thousands of Stores. Millions of Products.
    > http://shopping.yahoo.com/
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 17:00
    He's probably looking for a measure of the amount of oxygen dissolved in
    water.

    Read about it:
    Technical Dissolved Oxygen - The Fundamentals
    http://www.omega.com/techref/ph-1.html

    Sensors: (maybe not "inexpensive", and there are sure to be others around)
    http://www.omega.com/toc_asp/sectionSC.asp?section=FF&book=Green
    Maybe you could do something with the probe alone if you want to condition
    your own signal.

    Perhaps something could be done with the oxygen sensor from an automobile?

    Daniel
    Original Message
    From: dakota [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=VM8_5Xyo21Ty5YA000R6X4Z0xvJ1RRypWlleTjR-IKKDlhZ1i6_hvlxwIJfLQazHhiq8Hle9JvH5ErgDbhrS6Q]rfriedrich@i...[/url
    Sent: Tuesday, December 19, 2000 11:39 AM
    To: basicstamps@egroups.com
    Subject: Re: [noparse][[/noparse]basicstamps] Measuring oxygen in water


    isn't there 2 hydrogen molecules per 1 oxygen molecule ? or does water have
    an extra amount oxygen ?

    richard

    Original Message
    From: "Todd Botner" <contacttodd@y...>
    To: <basicstamps@egroups.com>
    Sent: Tuesday, December 19, 2000 10:10 AM
    Subject: [noparse][[/noparse]basicstamps] Measuring oxygen in water


    > Hello,
    >
    > IS there an inexpensive device that will measure
    > oxygen level in water? Of course I would like to
    > output the signal to the BS2.
    >
    > Thanks,
    >
    > Todd
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Yahoo! Shopping - Thousands of Stores. Millions of Products.
    > http://shopping.yahoo.com/
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 17:57
    At 08:10 AM Tuesday 12/19/2000 -0800, you wrote:
    >Hello,
    >
    >IS there an inexpensive device that will measure
    >oxygen level in water? Of course I would like to
    >output the signal to the BS2.

    My guess would be that dissolved oxygen sensors aren't inexpensive.
    Sensors are available, but some general information might be wise,
    before purchasing anything.

    Rosemont Analytical has a general information sheet here:

    [noparse][[/noparse] http://www.rauniloc.com/pdf/ads/general/43-003.pdf ]

    which you may want to read before you proceed. Generally, sensors are attached
    to a purchased unit which prepares the signal for use. Often the output of
    these sensors is 4-20 ma. which would need to be interfaced to the Stamp.

    Rosemont Analytical's on line web presence is via their Uniloc Division
    which can be found here : [noparse][[/noparse] http://www.rauniloc.com/ ]. The dissolved
    oxygen sensors can be found here:
    [noparse][[/noparse]
    http://www.rauniloc.com/1-800-854-8257/default.las?Page=01&SubPage=01&Cat=03 ].

    Hope that gets you started.

    >Thanks,

    >Sure

    >Todd

    Regards,

    Bruce Bates
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 18:09
    >Hello,
    >
    >IS there an inexpensive device that will measure
    >oxygen level in water? Of course I would like to
    >output the signal to the BS2.
    >
    >Thanks,
    >
    >Todd
    >
    >__________________________________________________
    >Do You Yahoo!?
    >Yahoo! Shopping - Thousands of Stores. Millions of Products.
    >http://shopping.yahoo.com/

    I don't know of anything that would qualify as "inexpensive".
    Instrumentation is like that. For classroom or hobby use about the
    cheapest will be around $200 from Vernier:
    http://www.vernier.com/probes/do.html

    There are meters in the $500 and up range that consist of both a
    sensor and a microprocessor/display, but no convenient interface to
    an external logger. E.g.,
    http://www.ysi.com/ysi/envweb.nsf

    And there are >$500 DO transmitters meant for long-term deployment in
    process or environmental apps, e.g.,
    http://www.oxyguard.dk/

    Tracy Allen
    electronically monitored ecosystems
    http://www.emesystems.com
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 18:26
    Todd,
    Another good information source is Omega Engineering.
    http://www.omega.com/techref/ph-1.html for the explaination.

    http://www.omega.com/ppt/pptsc.asp?ref=PHDG70 for the probe and
    instrumentation.
    http://www.omega.com/ppt/pptsc.asp?ref=DOB343 for the less expensive one.
    As mentioned by others, none of it is cheap.

    Mike



    At 08:10 AM 12/19/2000 -0800, you wrote:
    >Hello,
    >
    >IS there an inexpensive device that will measure
    >oxygen level in water? Of course I would like to
    >output the signal to the BS2.
    >
    >Thanks,
    >
    >Todd
    >
    >__________________________________________________
    >Do You Yahoo!?
    >Yahoo! Shopping - Thousands of Stores. Millions of Products.
    >http://shopping.yahoo.com/

    _________________________________
    Mike Walsh
    walsh@i...
    California Institute of Technology
    Biology Electronics Shop
    MS 216-76
    Pasadena, CA 91125

    626-395-6825 , FAX 626-584-1654
    237 Beckman Behavioral Biology Bldg.
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 23:30
    Of Course,
    just measure the amount of hydrogen, then divide by two...

    (Sorry, I just couldn't resist...)

    At 10:38 AM 12/19/2000 -0600, you wrote:
    >isn't there 2 hydrogen molecules per 1 oxygen molecule ? or does water have
    >an extra amount oxygen ?
    >
    >richard
    >
    >
    >
    Original Message
    >From: "Todd Botner" <contacttodd@y...>
    >To: <basicstamps@egroups.com>
    >Sent: Tuesday, December 19, 2000 10:10 AM
    >Subject: [noparse][[/noparse]basicstamps] Measuring oxygen in water
    >
    >
    >> Hello,
    >>
    >> IS there an inexpensive device that will measure
    >> oxygen level in water? Of course I would like to
    >> output the signal to the BS2.
    >>
    >> Thanks,
    >>
    >> Todd
    >>
    >> __________________________________________________
    >> Do You Yahoo!?
    >> Yahoo! Shopping - Thousands of Stores. Millions of Products.
    >> http://shopping.yahoo.com/
    >>
    >>
    >>
    >>
    >
    >
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 23:49
    This oxygen sensor from Vernier is very widely used is schools across
    the US and Canada. Biology/Ecology classes find it extremely easy to
    use when plugged into the Texas Instruments cbl (calculator based
    labs) unit.

    Vernier is a VERY user friendly company and provides the info
    necessary for interfacing ALL of their sensors to various data
    acquisition devices. They carry sensors for magnetic field, force
    (strain gauges), colorimetry, temperature, light level, acceleration,
    distance and just about anything else a high school science class
    could dream up.

    It may not be as cheap or as satisfying as hacking something together
    'on your own', but when you are ready to buy something 'off the
    shelf' with a proven track record, give 'em a call.

    This isn't an ad - but I've been pleased with Dave and
    Christine Vernier's interfacing projects since they started in their
    garage with the Apple II !!!


    At 10:09 AM -0800 12/19/00, Tracy Allen, you wrote about Re:
    [noparse][[/noparse]basicstamps] Measuring oxygen in water:
    >
    > >IS there an inexpensive device that will measure
    > >oxygen level in water? Of course I would like to
    > >output the signal to the BS2.
    > >
    >I don't know of anything that would qualify as "inexpensive".
    >Instrumentation is like that. For classroom or hobby use about the
    >cheapest will be around $200 from Vernier:
    > http://www.vernier.com/probes/do.html

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