What Fluid can I us...
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Question What Fluid can I use in my Geometrics Proton Precession Magnetometer?

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List of approved fluids is as follows:

  1. n-Decane
  2. Shell Sol-71 (Shell oil product)
  3. Isopar-G (Exxon oil Co.)
  4. Odorless mineral sprits (Naptha)
  5. Mineral Spirits (Naptha)
  6. Charcoal Lighter Fluid
  7. Kerosene lamp oil
  8. Kerosene
  9. Mineral Oil (medicinal Grade)
  10. Diesel Fuel (may degrade diaphragm on marine systems)
  11. Camp Stove fuel
  12. White Gas
  13. Unleaded gas

The preferred fluids are items 1-7 above.

Items 3 & 4 are not the same as paint thinner. Paint thinner will
damage the sensor coils, as will Acetone, and should not be used.

Items 11 - 13 have a very low flash point and should be used with
extra caution, although any petroleum product must be handled

There are several Alcohols which will produce an acceptable signal,
but will tend to absorb water. This will degrade the performance of
the sensor over time. These should be replaced as soon as possible
with an alternate fluid from the above list.

Usable alcohols:

  1. Ethanol (Grain Alcohol) at least 190 proof
  2. Methanol (wood alcohol)
  3. Denatured Alcohol (ethanol made poisonous)

All of these fluids must be as clean as possible to ensure that no
water or contaminates (rust) are in them. Use a filter to make sure
the fluids do not contain rust from the storage container.

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Member Moderator
Joined: 8 months ago
Posts: 1

A bit more about option #4:

In Canada many people call this "Varsol" even though that is a brand name rather than the real name of the chemical.

The term "odorless" really means that it doesn't smell nearly as much as the other type of mineral spirits.  It still has a smell that is strong enough to be easily noticed.