Elcometer 205 Operating Instructions Manual page 17

• Prepare the surface.
See "Condition and preparation of surfaces" on page 42.
1. Apply couplant
For the gauge to work correctly there must be no air gaps between the transducer and the surface of
the material to be measured. This is achieved using a material called a couplant.
Before the transducer is placed on the surface, put a small amount of the couplant supplied with the
gauge on the surface of the material. Typically a single drop is sufficient.
2. Place transducer onto surface of material to be measured
Press the transducer wearface into the couplant. Moderate pressure on the top of the transducer using
the thumb or index finger is sufficient; it is only necessary to keep the transducer stationary and the
wearface seated flat against the surface of the material.
3. Read display
If six or seven bars of the stability indicator are showing, the display will be reading the correct
thickness of the material directly beneath the transducer.
If the stability indicator has fewer than five bars showing, or the numbers on the display seem erratic,
check to make sure that there is an adequate film of couplant beneath the transducer, and that the
transducer is seated flat against the material. If the condition persists, it may be necessary to select a
different transducer (size or frequency) for the material being measured.
The gauge will perform four measurements every second when the transducer is in contact with the
surface of the material. The display is updated as each reading is taken.
4. Remove transducer from surface
The display will show the last measurement made.
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