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.
To Next Page
Loading...
