Results 1 to 8 of 8

Thread: Cannot get Apex salinity probe to calibrate

  1. #1
    New User
    Join Date
    Jul 2017
    Location
    us, Eastern Time
    Posts
    10

    Cannot get Apex salinity probe to calibrate

    I need some help, I am new so if I ask anything that has already been asked sorry. I did search did not find anything. I cannot get Apex Salinity probe to calibrate it is new and the other probes calibrated fine. Any help will be appreciated.

    Thanks
    Bill

  2. #2
    Frequent Contributor zombie's Avatar
    Join Date
    Dec 2013
    Location
    Denver, CO
    Posts
    13,176
    Let it soak in your tank for a week to rehydrate it as it is shipped dry.

    After that has happened, enable temp compensation at a value of 2.2 to start. For the first calibration, get your tank temp as close as possible to 77F and float the calibration packet for at least 15 minutes. Before doing the dry part of the calibration lightly rinse the probe in RODI and pat dry. For the 53mS step, use a clip or magnet to keep the packet touching the water and and calibrate the probe there giving it about 5 minutes to settle. Once calibrated, keep an eye on the relationship between conductivity and temperature. If cond rises as temp rises, you need to bump the compensation value up by 0.1 and vise versa if there is an inverse relationship. If cond stays within a band of 0.2 to 0.3 max to min your compensation is dialed in.

    Once this has all been done, tank temp no longer matters for calibration as long as the packet is the same temp as the tank. Calibrate quarterly or whenever the readings appear to be drifting.

    You might be an engineer if...You have no life and can prove it mathematically.

  3. #3
    New User
    Join Date
    Jul 2017
    Location
    us, Eastern Time
    Posts
    10
    Quote Originally Posted by zombie View Post
    Let it soak in your tank for a week to rehydrate it as it is shipped dry.

    After that has happened, enable temp compensation at a value of 2.2 to start. For the first calibration, get your tank temp as close as possible to 77F and float the calibration packet for at least 15 minutes. Before doing the dry part of the calibration lightly rinse the probe in RODI and pat dry. For the 53mS step, use a clip or magnet to keep the packet touching the water and and calibrate the probe there giving it about 5 minutes to settle. Once calibrated, keep an eye on the relationship between conductivity and temperature. If cond rises as temp rises, you need to bump the compensation value up by 0.1 and vise versa if there is an inverse relationship. If cond stays within a band of 0.2 to 0.3 max to min your compensation is dialed in.

    Once this has all been done, tank temp no longer matters for calibration as long as the packet is the same temp as the tank. Calibrate quarterly or whenever the readings appear to be drifting.

    You might be an engineer if...You have no life and can prove it mathematically.
    Thank you

  4. #4
    New User
    Join Date
    Jul 2017
    Location
    Dallas, Texas
    Posts
    5
    will 4-5 days soaking be enough? Or is a full week needed?

  5. #5
    Frequent Contributor zombie's Avatar
    Join Date
    Dec 2013
    Location
    Denver, CO
    Posts
    13,176
    4-5 should be plenty

    You might be an engineer if...You have no life and can prove it mathematically.

  6. #6
    New User
    Join Date
    Jul 2017
    Location
    Dallas, Texas
    Posts
    5
    Thank you zombie - tried to send you private message, but I need to be on this forum a few more days first - lmao.

    Quote Originally Posted by zombie View Post
    4-5 should be plenty

    You might be an engineer if...You have no life and can prove it mathematically.

  7. #7
    Frequent Visitor
    Join Date
    Nov 2013
    Location
    Silver Lake MN
    Posts
    67
    Rehydrate first I have heard that. The probe is an electrical voltage monitor I did not think there was nothing to "Hydrate" can you educate me on what hydrates over 4-5 days?

  8. #8
    Frequent Contributor zombie's Avatar
    Join Date
    Dec 2013
    Location
    Denver, CO
    Posts
    13,176
    Quote Originally Posted by Jonty View Post
    Rehydrate first I have heard that. The probe is an electrical voltage monitor I did not think there was nothing to "Hydrate" can you educate me on what hydrates over 4-5 days?
    It's the same basic principle as with pH probes. There are different electrical properties on the glass bulbs when there is a thin layer of hydrated glass (were talking verrrrry thin here) than without. If you calibrate without hydrating first the immediate reading will be correct. However as the thin layer develops, the electrical properties change and therefore so does the reading requiring another calibration. By hydrating first you save the calibrating steps while the electrical properties are changing.

    You might be an engineer if...You have no life and can prove it mathematically.

Similar Threads

  1. Help! Salinity Probe won’t calibrate
    By Ladybug5234 in forum A2 Apex/ApexEL and A3 Apex Pro/Apex/Apex Jr
    Replies: 5
    Last Post: 4 Weeks Ago, 11:29
  2. Salinity probe will not calibrate
    By mikus in forum A2 Apex/ApexEL and A3 Apex Pro/Apex/Apex Jr
    Replies: 1
    Last Post: 06-28-2019, 07:51
  3. Help! Can’t get salinity probe to calibrate
    By Russell13 in forum AquaBus Modules, Probes, and Breakout Boxes
    Replies: 3
    Last Post: 06-27-2019, 01:45
  4. I'm so frustrated with trying to calibrate my salinity probe! Please help.
    By RussC in forum A2 Apex/ApexEL and A3 Apex Pro/Apex/Apex Jr
    Replies: 15
    Last Post: 12-17-2017, 10:07
  5. Cannot Calibrate My Salinity Probe
    By Magickiwi in forum AquaBus Modules, Probes, and Breakout Boxes
    Replies: 15
    Last Post: 12-16-2013, 19:41

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •