Lake Shore Model 321 Autotuning Temperature Controller User’s Manual
Operation
3-5
3.2.3 Thermocouple Temperature Compensation (Model 321-04 Only)
For thermocouple sensors only (Model 321-04), the temperature compensation display is shown after
the Input Type display has timed out (
≈
3 seconds). The display appears as follows:
Use either the
s
,
t
, or
Input Type
button to cycle the selector arrow (
→
) between choices. The
available selections are On and Off, with Off being the default. Press
Enter
to retain the selected
setting or
Escape
to return to the normal display and retain the old setting. Also refer to
Paragraph 2.7.2.1.
3.2.4 Display
Filter
The filter function reads 8 sequential temperature readings and displays the average. It is used to
quiet the display, making it more readable when the sensor is exposed to fluctuating conditions. Filter
affect the display only and does
not
affect any other control functions. Filter has the effect of slowing
the display, and therefore should not be used when ramping. To turn the filter on, press and hold the
Input Type
button (for
≈
5 seconds) until you see the following display.
Use either the
s
,
t
, or
Input Type
button to cycle the selector arrow (
→
) between choices. The
available selections are On and Off, with Off being the default. Press
Enter
to turn the filter on or
Escape
to return the normal display and retain the old setting.
3.2.5 Curve
In order for the controller to provide accurate temperature readings, it is necessary to select the
response curve that matches the sensor being used. To determine which curve is selected, press the
Curve
button. The default curve for the Model 321-01 is Curve 10, being the second selection in the
curve list built into the unit. Refer to Table 3-1. The default display is shown below.
The default curve for the Model 321-02 is Curve DIN-PT, being the third selection in the curve list built
into the unit. Refer to Table 3-1. The default display is shown below.
The default curve for the Model 321-04 is Curve AuFe07%, being the sixth selection in the curve list
built into the unit. Refer to Table 3-1.
