Lake Shore Model 340 Temperature Controller User’s Manual
Front Panel Operation
4-7
4.5.3 Reading Source and Display Units
Readings shown on the display are taken from the sensor inputs, but a variety of digital processing can be
done to the raw sensor data before it is displayed (see Figure 5-10). One or more of these sources can be
displayed at the same time for an active sensor input.
Sensor
Raw sensor units as read from the temperature sensor.
Temp K
Temperature in Kelvin. Requires a temperature response curve selected
in Input Setup. Refer to Paragraph 5.1.
Temp C
Temperature in Celsius. Requires a temperature response curve selected
in Input Setup. Refer to Paragraph 5.1.
Max
Maximum value read since last reset. Refer to Paragraph 5.3.2.
Min
Minimum value read since last reset. Refer to Paragraph 5.3.2.
Linear
Output of a linear equation. Refer to Paragraph 5.3.3.
To select a display reading source, enter the sensor input (above). Press the
Enter
key to highlight the field
next to the input. use the
s
or
t
key to select a source for that reading display from the list. If a temperature
source is selected and no temperature response curve is present an error message will appear on the normal
display (
NOCURV
). Press the
Enter
or
Next Setting
key to change the next reading display. Press the
Save
Screen
key to store the changes in the Model 340. The default setting is Temp K.
4.5.4 Control Loop Display
The Model 340 has the ability to operate one or two temperature control loops. The user has the option of
displaying parameters from either one or both loops. When both loops are displayed, fewer parameters are
shown on the normal display. The hidden parameters can be viewed by pressing the
Loop 1
or
Loop 2
key,
they will also appear when being changed.
Loop 1
Displays Loop 1 parameters including P, I, D and Manual Out
Loop 2
Displays Loop 2 parameters including P, I, D and Manual Out
Both
Displays setpoint, control channel, and percent (%) output for both loops,
Heater Range for Loop 1.
None
Neither set of control loop parameters are shown.
To select a control loop display format, press the
Display Format
key, then press the
More
key to show the
CONTROL DISPLAY FORMAT
screen. The control loops line will be highlighted so use the
s
or
t
key to
select one of the choices. Press the
Enter
or
Next Setting
key to continue with other settings. Press the
Save Screen
key to store the changes in the Model 340. The default setting is Loop 1.
4.5.5 Large
Heater
Display
There are applications where the amount of power being driven into the control load is as important as the
control temperature. In this case the control loop output can be shown in large characters on the display. The
larger output will replace P, I, D, and Manual Output on the display. The hidden parameters will still appear
when being changed.
To turn the large output display on or off, press the
Display Format
key, then press the
More
key until you
see the
CONTROL DISPLAY FORMAT
screen. Press the
Next Setting
key until the
Large Output
line is
highlighted, then use the
s
or
t
key to select on or off. Press the
Enter
or
Next Setting
key to continue with
other settings. Press the
Save Screen
key to store the changes in the Model 340. The default setting is Off.
NOTE:
The
Large Output
option will not be visible if
Control Loops: BOTH
is selected. Change the
Control Loop setting back to
Loop 1
or
Loop 2
, press the
Enter
key, then the
Large Output
selection will be available.