Setting Up The Gauge - Elcometer SG80 Operating Instructions Manual

5 SETTING UP THE GAUGE

5.1 TRANSDUCER - ZEROING
Setting the zero point for the transducer is important for the same reason that setting the zero on a
mechanical micrometer is important. If the zero point of the transducer is not set correctly, all of the
measurements the gauge makes will be in error by some fixed number. When the zero point of the
transducer is set, this fixed error value is measured and automatically corrected for in all subsequent
measurements.
Though the gauge will remember the last zero point, it is generally a good idea to set the zero point
whenever the gauge is switched on, as well as any time a different transducer is used. This will ensure that
the zero point of the instrument is always correct.
The zero probe routine must be done prior to calibration.
1. Switch on the gauge and connect the transducer.
2. Remove all couplant from the face of the transducer and check that the
wearface of the transducer is clean and free of any debris.
3. Apply a drop of couplant on the transducer and place the transducer in
steady contact with the probe zero disk (the battery cover located on
the top of the unit), and obtain a steady reading.
The display should show a thickness value, and nearly all the bars of
the stability indicator should be illuminated.
Note: The value that is displayed will change depending on the current
velocity setting in your gauge. Disregard the value displayed; it is not
important. What is important is accurately performing these steps to
ensure reliability of the zero calculation.
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