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Calibration Pulley
A Calibration pulley is fastened inside every new Gravitometer (Figure 6-1).
This pulley can be used instead of a certified gas to check the calibration of the
instrument. The pulley (Part No. 316-03031) is intended to make the Gravitom-
eter read 0.640 theoretical relative density.
Because of the tolerance on the diameters of the pulleys, you must use the
following test procedure to determine the exact relative density (±0.001) the
pulley will produce.
Calibration
Pulley
Figure 6-1.
Gravitometer, rear view, cover
removed.
Test Procedure for Calibration Pulley
1. Ensure that there is new Silica Gel in the Dryer and that the Selector Valve
2. Turn the power Off. Remove the upper Impeller pulley and measure its
3. Measure the maximum diameter of the Calibration pulley at the crown
PN RI-212, Rev. L
is on "Zero". If necessary, turn the Zero Adjust until the Pointer reads
"1.000". Operate the Gravitometer.
maximum diameter at the crown with a micrometer.
using the micrometer. Install the Calibration pulley on the upper Impeller
Shaft.
Drive Belt
Motor and
Capacitor
Motor Pulley
|
Calibration
6-3
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