Adjustment Of Zero Point / Span - WIKA GCS-1 Manual De Instrucciones

7. Adjustment of zero point / span

7. Adjustment of zero point / span
Preparation
In order to access the zero point and span potentiometers, unscrew the protective
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cap using a screwdriver (see figure A).
Introduce a reference mass which is at least 3 x as accurate as the given accuracy.
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Zero point
Remove the load from the gas cylinder scale.
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By adjusting the signal to 4 mA, the zero point can be set (see figure B).
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Span
Set the span by loading the scale with the appropriate reference mass and adjusting
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the signal to 20 mA.
Check the zero point.
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If the zero point is not right, repeat the procedure.
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Screw the sealing cap with seal back in, in order to close the potentiometer entry.
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A
B
After the adjustment, check that the system is functioning correctly.
Recommended recalibration cycle: 1 year
WIKA operating instructions gas cylinder scale model GCS-1
GB
15