D-2000 Series
Revised March 2020
Page | 2-8
Checking Bath Concentration Using Settling Test
NOTE
: The settling test applies to both oil and water suspensions. As water evaporates more quickly than oil,
water baths generally require more frequent maintenance. Check applicable specifications for test frequency.
1. Allow the pump to thoroughly agitate the suspension for at least fifteen minutes to assure uniform
particle distribution.
a. Run the suspension through a spray nozzle for at least one minute to assure the suspension in the
hose is fresh and agitated.
2. Using the spray nozzle, fill the centrifuge tube with agitated solution to 100 ml.
3. Centrifuge tube with solution should be demagnetized by one of the following methods:
a. Hold centrifuge tube with solution in the middle of the coil and initiate a demag cycle (1000A or
higher).
OR
b. Run the centrifuge tube with solution through a stand-alone demagnetization unit (S or SB-Series).
4. Place the centrifuge tube in its stand (Magnaflux Accessory Part Number 1837A) and allow the
suspension to settle for thirty minutes (water bath) or sixty minutes (oil bath) in a vibration-free location.
5. Observe the total level of settled particles. Graduations read directly in milliliters (ml). If a contaminant
layer is present, subtract from the total level to obtain magnetic particle concentration.
6. Illuminate the centrifuge tube and suspension with a black light (Optional). Fluorescence in the liquid or
presence of a non-fluorescent particle layer indicates a solution breakdown and requires replacement
of the tank solution.
7. If the solution concentration is outside the range of the manufacturer’s recommendations or applicable
specifications, adjust the amount of liquid or particles as required. Repeat steps 1 through 5 to verify
concentration.
8. Return the contents of the centrifuge tube to the tank and clean the centrifuge tube prior to the next
test.
PREPARATION FOR STORAGE OR SHIPMENT
Limited Storage
When the inspection unit will not be used for a period up to 30 days, it should be serviced as follows:
1. Open the Auto-bath valve (Optional).
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