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| # | Post Title | Result Info | Date | User | Forum |
| What Fluid can I use in my Geometrics Proton Precession Magnetometer? | 3 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| List of approved fluids is as follows: n-Decane Shell Sol-71 (Shell oil product) Isopar-G (Exxon oil Co.) Odorless mineral sprits (Naptha) Mineral Spirits (Naptha) Charcoal Lighter Fluid Kerosene lamp oil Kerosene Mineral Oil (medicinal Grade) Diesel Fuel (may degrade diaphragm on marine systems) Camp Stove fuel White Gas 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 carefully. 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: Ethanol (Grain Alcohol) at least 190 proof Methanol (wood alcohol) 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. | |||||
| Why does my MagArrow have 0 readings or missing records? | 3 Relevance | 2 years ago | Rui Zhang | Hardware | |
| There are many reasons causing 0 readings or missing records: 1. MagArrow is dead-zone-free. But this doesn't mean it can be operated in any environment. If the background magnetic field is outside its operating range (20-100uT) or its gradient is too large, MagArrow will have readings of 0 (or dropouts). Usually this happens when you test the instrument inside a building. One way is to place the MagArrow on a Wood/plastic table. 2. The default conversion of Survey Manager is NOT to include data points without locations. Inside a building, you may not have GPS signal, leading to missing records. This topic is also discussed in Missing records from magnetometer export. 3. If the 0 readings occur during a survey, especially consistently along a certain direction, you may want to check the operating status of 2 sensors inside the MagArrow. First, make sure your MagArrow embedded software is MagArrowSetup-3.0.1915-881 or later. If not, please go to our website MagArrow embedded software update, download and install the latest embedded software(instruction inside the downloaded zip file). Connect to the new webpage ( .). The "Operating status" of each magnetometer, as shown below, should be "OK". If not, please record the error code and power cycle. To finish the survey, please keep an eye on this status whenever the MagArrow returns to the base during the survey (power cycle if error). If the error occurs more than twice during your survey (make sure it is not an isolated event), please contact Geometrics and report the error code. Please note that for "Combined sensor" (dead-zone-free) MagArrows, there is ONLY one reading in Mag1. Mag2 Data Valid is always "NO". | |||||
