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Technical Support >

Technical Support Services

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Gilian Technical Information
Rediflo2 Maintenance(pdf) Rediflo2 Parts and Diagram, Grundfos Black Control Box Troubleshooting
Photovac PID/FID
  • Detectable Compounds for PID/FID/Gas Chromatograph
  • Tech Tip #1 microtip/Tip Detectable Compounds 1991
  • Photovac MicroFiD Operation Guide (pdf)
  • 2020 Won't Turn On Off Flyer
  • We are no longer supporting the Photovac line of products. Iy your Photovac 2020 Won't turn off or won't stay on you may be able to fix it if the circuit board mounted memory battery still holds a charge. Due to the time since end of production of the Photovac 2020 and the need for this battery to be replaced by Photovac, Inc. to retain Intrinsic Safety certification, most of the units experience may now be out of the ability or repair outside of the factory. Below is our instructions for a 2020 that has a internal memory battery that takes a charge and will hold the charge for at least a few hours.

    Cold Starting Photovac 2020(clears all memory and calibrations)
    To Cold Start the Photovac 2020:

  • 1-Turn the instrument off
  • 2-Hold down the upper left button (it is above the "on/off" button)
  • 3-Turn the 2020 on while still depressing the upper left button
  • 4-After 2 seconds release both buttons
  • 5-Reset the Time, Date and Calibration settings
  • 6-ReCalibrate
  • Horiba U-10 > Technical Info on Horiba U-10 (pdf)

    Q: How deep will a metal detector/locator go?

    A: This is the question most frequently asked. Unfortunately, it has no absolute answers. The following variables, in addition to your own detector's capabilities, all have an effect on the answer.

    1. Conductive properties of the soil: Heavily mineralized soil will tend to reduce the penetration power of your detector. Soil mineralization may vary greatly, and you may have to re-ground balance your detector to adjust for soil mineralization; unless, of course, your detector has automatic ground balancing. In this case, you may need to decrease sensitivity and/or increase discrimination on models like the Fisher 1266-X, which has extraordinary sensitivity.

    2. The length of time an object is buried: Various chemicals in the soil have a corrosive action on metal. Some metals corrode faster than others. A modern zinc penny is attacked by these soil chemicals quite easily, whereas the action on copper and silver is much less, and corrosive action on gold is hardly noticeable, if at all. As these chemicals eat away at the metal, oxidation (rust) takes place, which is absorbed into the surrounding soil. This causes the soil to become more conductive, which in turn makes the metallic object appear larger than it actually is and easier to detect. This is known as the "halo effect."

    3. The size of an object: The larger the metallic object, the easier and deeper it can be detected. For example, a bucket can be detected much easier than a single coin. The more surface area seen from above, the deeper the metallic object will be detected.

    4. The shape of an object: Every metallic object reradiate's at least part of the signal transmitted by your metal detector. In this way, objects function like additional antennas, and consequently their shape becomes important. Ring or loop-shaped objects lying flat, on or under the ground, produce the best results; flat or dish-shaped objects are similarly easy to detect. Rod-shaped items, especially when scanned end-on, are very difficult to detect unless they're made of iron and you're using a ferromagnetic detector, such as the Fisher FX-3.

    5. The degree of magnetization: With ferromagnetic locators, such as the FX-3, the degree of magnetization has a strong influence on depth. A magnet, for example, can be detected at much greater depth than an equivalent mass of iron. The more magnetization an object has, the deeper it can be sensed by a ferromagnetic metal detector.

    Geotechnical Services, Inc.
    2852 Walnut Ave., Suite E-1

    Tustin, CA 92780

    Phone 714-832-5610

    Fax 714-832-8766

    LAT 33.71232 / LON -117.80591

    CALL TOLL FREE 800-524-9111

    Out of the country credit card sales must be handled through a U.S. intermediary or the first several sales must be cash, check or money order in order to create a good business relationship. Once that has been done, we will honor your credit card purchases.

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    Copyright 2001 GEOTECHNICAL SERVICES, Phone: 800.524.9111
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