Users’ Manual
EAN-26MH Horizontal inclinometer system
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19
7 CALIBRATION CHECK JIG OF INCLINOMETER PROBE
The calibration check jig is used to ensure that the original factory calibration is unchanged. Any drift in
inclinometer probe calibration at a later date will be detected by the calibration jig. The calibration jig
should be fixed to a vertical wall so that at 0
°
position the calibration jig fixed plate is aligned as much
horizontal as possible. Before using the probe for taking readings the probe should be inserted in the
calibration jig and probe readings for 0
°
and + and - 30
°
positions are noted down. If any drift is detected
in the probe readings at a later date, it indicates that the probe needs calibration. It should be noted that
the 0
°
and
±
30
°
positions are approximate and should not be taken as calibration points.
Figure 16 shows the calibration jig components. The mounting brackets should be attached to the fixed
plate of the calibration jig using the supplied set of fasteners. The calibration jig should be fixed to a
vertical wall surface by fixing the mounting brackets to the wall using any commercially available
brick/concrete fasteners with 10 mm stud diameter. While fixing ensure that the fixed plate of the
calibration jig is lengthwise aligned as much horizontal as possible.
Figure 17 shows the index pin and the three reference holes as seen from the back of the calibration jig.
After installation this side of the jig faces the wall. The index pin is attached to the calibration jig by a
length of chain. During calibration check the inclinometer guide assembly is rotated till the index pin goes
through any one of the three holes seen in the figure and the locating hole provided in the guide
assembly.
The middle hole corresponds to 0
°
position and the two holes at either side correspond to + and – 30
°
positions. It is immaterial which hole is consve as only the probe readings corresponding to the
three holes positions are to be noted for future reference.
Figure 16 – Calibration jig components
Figure 17 – Index pin and reference holes
