WIKA GCS-1 - Manual (Page 15)

15 WIKA operating instructions gas cylinder scale model GCS-1
GB
11145676.05 11/2011 GB/D/F/E
A
B
After the adjustment, check that the system is functioning correctly.
Recommended recalibration cycle: 1 year
7. Adjustment of zero point / span
Preparation
■ In order to access the zero point and span potentiometers, unscrew the protective
cap using a screwdriver (see figure A).
■ Introduce a reference mass which is at least 3 x as accurate as the given accuracy.
Zero point
■ Remove the load from the gas cylinder scale.
■ By adjusting the signal to 4 mA, the zero point can be set (see figure B).
Span
■ Set the span by loading the scale with the appropriate reference mass and adjusting
the signal to 20 mA.
■ Check the zero point.
■ If the zero point is not right, repeat the procedure.
■ Screw the sealing cap with seal back in, in order to close the potentiometer entry.
7. Adjustment of zero point / span