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Seesnake in the Vertical.

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  • Seesnake in the Vertical.

    I went to a job yesterday and had major dramas trying to find the sonde in a pipe.

    The sonde was giving readings that were way off and my only conclusion was that the sonde was in the verticle plain.

    My understanding is that the sonde puts out a north pole and a south pole and with a Navitrack you find one pole and then the other.

    So what do you look for when you suspect that the sonde is in the vertical and how do you find it.

    Simon

  • #2
    Re: Seesnake in the Vertical.

    if the sonde is "tilted" very much you will only see one node and possibly the apex/peak on the screen, when viewed from above. i've had dubious luck locating holding my Scout horizontally with the sonde in a vertical pipe.

    steve
    In the never ending struggle to keep the water flowing.... The Poo Poo Cowboy rides again!!!

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    • #3
      Re: Seesnake in the Vertical.

      If the Sonde is tilted, one Pole will move closer to the Sonde and the other farther away so that the Sonde location no longer lies midway between to two poles. The signal strength of the nearer Pole becomes higher than that of the more distant Pole.

      If the Sonde is vertical, one Pole will be directly above the Sonde and will also correspond to the point of maximum signal strength. The other Pole will not be seen.

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      • #4
        Re: Seesnake in the Vertical.

        When a xmtr is vertical, you need to put your rcvr. in Null mode (don't know if Ridgid recvrs. will do this, but my Radiodetection recvrs. will.) Then carefully look for the largest peak. There will be a false peak around the entire circumference of the real peak. The amplitude of this peak will be significantly lower than the real peak.

        You can also find the true location of the xmtr. when the receiver is in peak mode, but it is almost impossible to describe how without diagrams.

        Be aware that you cannot get a depth reading of a non-horizontal xmtr.

        It's usually just easier to pull the camera back from the vertical spot into horizontal and get your mark, then push forward, tracking your distance, into the vertical section, so you know where it is.

        Comment


        • #5
          Re: Seesnake in the Vertical.

          Originally posted by Some Day Plumbing View Post
          So what do you look for when you suspect that the sonde is in the vertical and how do you find it.

          Simon
          The #1 rule is to always verify your locate by checking the signal strength, and then mark the sonde's location where the signal is strongest.

          1. Use signal strength to find the sonde's general direction
          2. Locate your first pole
          3. Locate the 2nd pole
          4. Line yourself up between the poles and find the equator
          5. Verify that the signal DROPS when you move in any direction away from the equator

          If the signal drops, the sonde's antenna is not oriented in the horizontal plane (this will almost always be the case if you're locating a FloatSonde, because its antenna is oriented vertically).

          Because NaviTrack receivers have omni-directional antennas, there are no nulls or false peaks to contend with. Ever. Locating is as simple as find the one spot where the signal is strongest. In most cases you will find it faster and easier to use the map (poles and equator) to do this, but you can also pinpoint the sonde using nothing but the signal strength.

          In fact, when locating a vertical sonde (or a FloatSonde), your best bet is to use ONLY the signal strength to pinpoint its location.

          Whether you use the map or the signal strength, remember the #1 rule: Once you think you're over the sonde, move the receiver away from that point to make sure the signal drops.

          Comment


          • #6
            Re: Seesnake in the Vertical.

            Originally posted by irguy View Post

            Whether you use the map or the signal strength, remember the #1 rule: Once you think you're over the sonde, move the receiver away from that point to make sure the signal drops.
            Change that to:

            "Whether you use the map or the signal strength, remember the #1 rule: Once you think you're over the sonde, move the receiver away (in several different directions) from that point to make sure the signal drops."

            and you got it exactly right.

            Comment


            • #7
              Re: Seesnake in the Vertical.

              <<(in several different directions)>>

              Good call, thanks.

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