Pen Arm Calibration - Thermo Scientific 274F Manual

C R O
HART ECORDER
Figure 5: Pen Arm Assembly
16
M
PERATION AND AINTENANCE

Pen Arm Calibration

When the unit is first powered on, the pen arm(s) will
move off of the chart and then move back onto the chart
briefly stopping at the outer most temperature graduation
ring of the chart paper. If the pen does not stop exactly at
this location on the chart, it can be adjusted or "calibrat-
ed" by using the left (#1) or right (#2) arrow buttons (refer
to Figure 6). When the pen moves back onto the chart
and briefly stops, you will have approximately five sec-
onds in which to adjust the pen's position using the left
and right arrow buttons of Figure 6.
To check and/or adjust the pen's alignment to the outer
most temperature graduation ring, press and hold the
chart change (#3) button until the pen begins to move off
of the chart. Once the pen(s) has moved off of the chart,
again press and hold the chart change (#3) button until
the pen begins to move back onto the chart. The pen will
briefly stop at the outer most temperature graduation ring
before continuing onto the chart to begin recording.
Each time the chart paper or fiber tip pen cartridge is
changed, you should make sure that the pen stops at the
outer most temperature graduation ring of the chart
paper. Otherwise, this pen offset will cause the unit to
record an incorrect temperature on the chart.