Digital Salinity Meter

Discussion in 'Test Kits, Controllers, Reactors and Dosers' started by Muhammad95, 2 Aug 2012.

  1. Muhammad95

    Muhammad95

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    Hi guys :)

    Has anyone had experience with a digital salinity meter? Just wondering how accurate they are as I'm going to be ordering a few for +-R400 that measures salinity and temperature

    Thanks :thumbup:
     
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  3. 459b

    459b Moderator MASA Contributor

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    Why do you need to order a few of them?
     
  4. ChrisRaubs

    ChrisRaubs

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    Hey,,,

    Are you referring to a refractometer or the probes + shield for an Arduino set-up?

    If the latter is the case, you can look at the pH and conductivty kits by Atlas-Scientific... Reasonable prices with serious acuracy...

    Pls post a link of the stuff you want to order.... I'm curious as to what u are looking at getting...
     
  5. brentnorm

    brentnorm

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    Because I also want one.
     
  6. Muhammad95

    Muhammad95 Thread Starter

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    @459b A few guys and myself wanted refractometers and I was originally going to order those but I came across these instead and was wondering if they're just as effective if not better.
    @ChrisRaubs I'm on my phone at the moment so I don't have a link to the exact item.But it was something like this Digital Salinity Meter for Salty water measurement ( SM-850) - Detailed info for Digital Salinity Meter for Salty water measurement ( SM-850),Digital Salinity Meter,Digital Salinity Meter for Salty water measurement ( SM-850),SM-850 on Alibaba.com
     
    Last edited by a moderator: 26 Nov 2015
  7. Muhammad95

    Muhammad95 Thread Starter

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    Lol if there's guys on here that are interested I should open up a new thread and bring a whole lot down
     
  8. Quintin

    Quintin

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    Hey bud.
    I have been using mine now for almost a year and have no problems with it.
    tested it against my refractometer and the measurements I get out of the digital one are bang on.

    Here is the link.
    These guys have a special on.
    US40 for a digital salinity meter plus a ph pen. :yeahdude:
    gainexpress.com
     
  9. RiaanP

    RiaanP Moderator

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    For USD 97 to 117, that is R802 to 967.
    Why not just go with a refractometer that does have auto temperature adjustment?

    Also note, refractometer is faster. Put drops, close lid and check.

    These digital meters takes 30 seconds or longer. The longer the more accurate. So if you need to test a couple of times your salt mix until correct, I would rather go with a proper refractometer.

    and you can pick one up this afternoon from your LFS.
     
  10. Quintin

    Quintin

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    Have a look at the link.
    gainexpress.com

    The digital salinity meter I'm using from these guys also does ATC and works out the salinity for you according to the temperature of the water.
    Dont mind dipping it into a bucket or tank of water for 30 seconds. :whistling::whistling:
     
    Last edited: 2 Aug 2012
  11. RiaanP

    RiaanP Moderator

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    I do mind, if I had a digital one, that means last night I had to wait 7 times. Serious. That is how many times I did use my refracto last night.
     
  12. Muhammad95

    Muhammad95 Thread Starter

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    Thanks Quintin I'll have a look at the link you posted.I'll probably be getting pH meters aswell.

    I'm going to go with the digital meters since I don't really have any issue with waiting a bit and as you posted its acurate
     
  13. Quintin

    Quintin

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    Ha,ha,ha
    OK but it will most likely takes just as long to collect water in the pipette, drip it onto the refractometer check the reading and clean the refractometer photo cell again before the next reading.

    I do use both myself just to be sure and want to check if the readings are the same on both just to double sure.

    But I normally just stick to the digital one.
    By the way, the PH pen is super and very accurate.
    They also do TDS pens and a nice bunch of PH and Ozone controllers on that web site for under USD120.00 including the probes. :yeahdude:
     
  14. Albert Terego

    Albert Terego

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    These only give a result in % and then only to nearest 0.1%. I do not think they will be accurate enough for our purposes, and would probably require you to "calibrate" them against a refractometer first, before you start using (eg an SG of 1.025 = 3.1%)

    I also suspect that if you use different brands of salt, you would get different readings.

    Is this probe Sodium Chloride specific or does it work for all salts? What about blends of salts (like our Synthetic salts)
     
  15. Quintin

    Quintin

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    Calibration is easy.
    Dip it into R.O water and set it to 0ppt and you are done.
    You only need to re-calibrate if you change the batteries.

    Refractometers work with light.
    Water with impurities in it like salt will bend the light more or less going through the prism.

    The digital ones work with voltage.
    The more impurities (salt) in the water the better the current conducts and the readings can be taken on that.

    Both are easy to use if you know how.

    You do also know that you get specific type of refractometers?
    Not all of them are designed to measure salinity?
    Some are for Honey, Brix, Brake Fluid and other solvents.
     
    Last edited: 2 Aug 2012
  16. Muhammad95

    Muhammad95 Thread Starter

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    Thanks a lot guys.I'll be opening up a thread in the FS section so people can order if they're interested
     
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