Thermo Electron 3940 Series Скачать руководство пользователя страница 72

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R70-32 (WEB)

REV(12-04) D

Press and hold the "change chart" button (#3) until the
pen arm begins to move off of the chart and then
release the button. Wait until the pen has moved
completely off of the chart. When the "change chart"
button (#3) is pressed again, the pen will begin to
move back onto the chart briefly stopping at the
outermost graduation of the chart.

The pen arm will then move to the first control point
position and the green LED light will turn off. The pen
will remain at this position for a period of
approximately five (5) seconds during which time the
control point can be adjusted using the left arrow (#1)
or the right arrow (#2) push buttons. Refer to the
following figure for a diagram of the push buttons.
When the time has expired for adjusting the control
point, the green LED light will turn back on and the
unit will begin recording.

Figure 4:

Push buttons.

When the pen has two control points, the pen then
moves to the second control point at which time the
second control point may be adjusted. Having two
control points (per pen) allows you to define HIGH
and LOW temperatures that will open or close the
relay contacts. Approximately five (5) seconds after
you have finished adjusting the control point(s), the
LED light will turn solid green and the pen arm will
move to indicate the probe's temperature and the unit
will begin recording.

CHART "RANGE" SELECTION

If the recorder that you are using has a

range sticker

(that lists several temperature ranges) mounted on the
front of the chart plate, 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

pen's position on the chart paper will not correspond
to the temperature that is measured.

Also, if the pen moves to the center or outer edge of
the chart and remains there while the unit is powered
on, then this maybe an indication that the current
range that is selected for the unit is not correct. The
recorder has a built-in safety mechanism that will
always move the pen to the highest temperature on the
chart when the current temperature that is measured is
not within the selected range.

The recording unit can have up to eight (8) user
selectable ranges programmed into the unit. To select
from one of the available ranges, follow these
instructions:

After the recording unit has been powered-on and is
operating normally (recording temperature), press and
hold the "change chart" button (#3) until the pen arm
begins to move off of the chart. Once the pen has
moved off of the chart, press and hold the left arrow
(#1) or right arrow (#2) button for approximately
eight (8) seconds and then release the button. Refer to
Figure 4 for a diagram of the buttons.

Note:

If your recorder has a

Type A

microprocessor

controller PC board installed, then the current range
that the recorder is operating in will be altered when
this

change range

mode is entered. For example, if the

recorder is currently operating in range #1 and the left
arrow (#1) button is pressed for the eight second
period as described above and then released, the
current range will be advanced to range #2 and the
LED light will begin flashing two (2) times. Refer to
Figure 1A to determine if you have a

Type A

microprocessor controller PC board installed.

The green LED light will begin flashing one (1) time if
range #1 is selected or will flash two (2) times if range
#2 is selected and so on. Press the left arrow button
(#1) to increase the range number or press the