LakeShore 335 Front Panel Control

Front Panel Displays

The temperature controller is pre-programmed with default settings (see Default Temperature Controller Settings) that influence the liquid crystal display (LCD) readings. The default settings are appropriate for standard use of the temperature controller with the Dimension Icon Electrochemical Cell; no modifications are needed.

The symbols displayed by the LCD are:

• A: Sensor input A
• B: sensor input B
• S: Setpoint
• V: Sensor units (volts)
• ¾: Sensor units (ohms)
• mV: Sensor units (millivolts)
• K: Temperature in Kelvin
• C: Temperature, Celsius
• >: Maximum value
• <: Minimum value
• /: Linear equation result

Figure 1: Front of LakeShore 335 Temperature Controller

The LCD is treated as four equal-sized subpanels (see Figure 1). To change what is displayed in one of the subpanels:

1. Press the Display Setup button (under the LCD, top row, button “3”).
2. Select your Display Mode: Two Input Loop B. Custom settings are also available.

The four front panel light emitting diode (LED) “annunciators” record system status in normal operation. In normal operation, only the first light, Control A, is on.

• Control Outputs 1 (2): On when output 1 (2) is active.
• Remote: On when in Remote Mode (i.e., controlled through the IEEE-488 interface or USB port).

• Alarm: On continuously when the alarm feature is on, and blinks when any alarm is activated.

Basic Front Panel Operation

The full set of front panel functions is listed below. However, only a few of the front panel buttons are regularly used:

To enter a temperature setpoint:

1. Press Setpoint.
2. Enter a number (via the numbered dual function buttons in the left half of the front panel buttons).
3. Press Enter.

To turn on the heater:

1. Press Heater Range.
2. Toggle the arrow buttons to select High.
3. Press Enter.

To turn off the heater:

• Press All Off.

Front Panel Button Functions

There are 25 front panel function buttons (see Figure 1). Here they are listed from top-to-bottom and left-to-right and described briefly. See Default Temperature Controller Settings for the default values given to these parameters initially, and refer to the LakeShore 335 User’s Manual for more detail about each function.

• Input Setup: Selects among sensor types and associated temperature calibration curves.
• Output Setup: Selects control input, setpoint units, closed vs. open loop control mode, power up enable, setpoint ramp enable, ramp rate, and display of heater output units.

• Display Setup: Enables programming the LCD.
• Curve Entry: Allows entry of up to twenty 200-point custom temperature calibration curves.
• Interface: Sets the baud rate of the serial interface and sets IEEE-488 address an terminators.
• Remote/Local: Selects between the IEEE-488 interface and local operation of the controller.
• Ramp Rate: Enables and sets Setpoint ramping.
• Zone Settings: provides for entry of ≤10 temperature control zones, each with its own PID (see next) control parameter settings.
• Autotune: Selects among tuning modes: AutoTune PID, PI, P, Manual PID or Zone for the control loop.
• Alarm: Used to enable alarms and relays.
• Relays: Configures relays.
• Max/Min Reset: Resets the maximum and minimum readings.
• Up arrow key: For parameter selection and navigation.
• Down arrow key: For parameter selection and navigation.
• Escape: Terminates a setting function without changing parameter values.

• Enter: Completes setting functions and returns to normal operation.
• A (B): Displays sensor information
• Setpoint: The target setting of the active control loop.
• PID: Permits manual adjustment of control parameters Proportional (P), Integral (I) and Derivative (D).
• Manual Out: Manual Heater Power (MHP) for the control loop.

• Heater Range: Selects among High, Med(ium) and Low.
• All Off: Turns the heater off.
• 0–9, +/-: Used for numeric entries.

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