Pen Calibration; Fiber-Tip Pen - ABB Fulscope 76J Series Model C Instructions Manual

76J Pneumatic Fulscope Recorder
MAINTENANCE
If the pen fails to touch the chart paper bend the pen arm slightly as described in paragraph
4.3.1.
When the recorder is not in use, place the pen cap on the tip of the pen to protect and seal the
tip from evaporation. The shelf life of the pen is a minimum of 12 months.
4.4

PEN CALIBRATION

The following calibration procedure is used to set the Zero, Span, and Linearity adjustments of
the recorder. It is based on applying 0, 100, and 50% of span to the measuring element of the
pen(s) being calibrated. If the recorder has multiple pens, each is calibrated independently in
the same manner as a single pen.
The input range appears on the data plate located on the door of the recorder and may be
verified by the tagging attached to each measuring element. Some input ranges are not zero
based such as 3 to 15 psig and 30 to 130°F. When calibrating the recorder, care should be
taken to always express input values in % of span. When determining the actual input value
for calibrating a recorder with a non zero based input range, always add the lower range value
to the span value.
18
Figure 9. Fiber-Tip Pen