Chart Range Selection - Thermo Scientific 274F Manual

C R O
HART ECORDER
20
M
PERATION AND AINTENANCE

Chart Range Selection

If the recorder has a range sticker (that lists several tem-
perature ranges) mounted on the front of the chart plate,
under the chart, then the following section will apply to
you.
This recording unit has the option for the user to select
from several temperature ranges that are programmed
into the recorder. NOTE: The chart paper that is used on
the recording unit must match the range that is selected
for the recorder. Otherwise, the pens position on the
chart paper will not correspond to the temperature that is
measured.
Also, if the pen moves to the center of the outer edge of
the chart and remains there while the unit is powered on,
then this may be an indication that the current range
selected for the unit is incorrect. The recorder has a built
in safety mechanism that will always move the pen to the
highest temperature on the chart when the current tem-
perature that is measured is not within the selected range.
To select from the ranges available, press and hold the
"change chart" button (#3) while in normal operating
mode, until the pen arm begins to move off the chart.
Once the pen has moved off the chart, press and hold the
left arrow (#1) or right arrow (#2) button for approximately
five (5) seconds and then release the button. Refer to
Figure 6.
The green LED light will begin flashing one time if range
#1 is selected or will flash two times if range #2 is select-
ed and so on. Press the left arrow key (#1) to increase
the range number or press the right arrow button (#2) to
decrease the range number that is selected for the
recorder. When finished selecting the range, press and
hold the "chart change" button (#3) until pen begins to
move back onto the chart and the selected range will be
saved into the recorder's permanent memory.