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Default Temperature Controller Settings

The LakeShore 331S Temperature Controller has been programmed by Bruker with default settings applicable to Dimension Icon Electrochemical Cell applications. Some of these are modifications of LakeShore’s original defaults. Both settings are listed below.

Reset Procedure: LakeShore Defaults

  1. To reset the controller to the LakeShore default settings, press and hold the Escape key until the contents of Figure 1 appear:

Figure 1: Controller Default Settings Reset Prompt Screen

NOTE: The “Code Date” in Figure 1 varies with firmware revision.
  1. Use the up/down arrow keys to select Yes (to reset) or No (to cancel)
  2. Press Enter. A second screen appears (see Figure 2):

Figure 2: Second Controller Default Settings Screen

  1. Use the up/down arrow keys to select No, then press Enter.
CAUTION: Selecting Yes to clear curves in the last step erases any stored curves other than the 21 standard curves. The Electrochemical Cell uses a nonstandard curve (i.e., #22); it would have to be re-entered if curves were cleared in the last step. Contact Bruker Technical Support if the nonstandard curve used by the Electrochemical Cell must be re-input to the controller.
CAUTION: Verify that both Input A and Input B are set to the Bruker defaults.

Reset: Bruker Defaults

Only the parameters appearing in bold font in the “Bruker Default” column have values different from the LakeShore default, so need to be changed. To reset individual parameters to the Bruker default:

  1. Press the associated controller front panel function button.
  2. Press Enter (repeatedly, if necessary) until the parameter of interest appears.
  3. Toggle the up/down arrow buttons to the value desired, or enter a numerical value.
  4. Scroll (press Enter repeatedly) until the end of options for the parameter, or press Escape to quit the function button.
NOTE: The Bruker defaults are highlighted (bold) where they differ from the LakeShore default settings.

Temperature
Controller
Button

Temperature
Controller Parameter

Bruker Default

LakeShore
Default

Control Setup:

Control Input

Input B

Input A
 

SP Units

Temp C

Temp K
 

Control Mode

Closed

Closed
 

Power Up

Disable

Disable
 

Heater Output Display

Current

Current
 

Setpoint Ramp

Off

Off

Zone Settings:

Setpoint Limit

0.000 K

0.000 K
 

Proportional (P)

50.000

50.000
 

Integral (I)

20.000

20.000
 

Derivative (D)

1.00

0.00
 

Manual Output

0.00%

0.00%
 

Heater Range

Off

Off

Input Setup - Inputs A & B:

 

Fluid Heater

Thermocouple/25 mV

 

Type

NTC RTD

Thermocouple/25 mV
 

Curve

21 User 2252

Type K
 

Reversal

On

N/A

Display Format:

Location/Display/Source

1/Input B/Temp C

1/Input A/Temp K
 

Location/Display/Source

2/Input A/Temp C

2/Input B/Temp K
 

Location/Display/Source

3/Setpoint/-

3/Setpoint/-
 

Location/Display/Source

4/Heater Output/-

4/Heater Output/-
 

Alternate Location/
Display/Source

4/Input A/Linear

N/A

Alarm - Inputs A&B:

Alarm

Off

Off
 

Alarm Audible

Off

Off
 

Relay 1

Off

Off
 

Relay 2

Off

Off

Remote/Local:

N/A

Local

Local

Setpoint

N/A

20.000°C

0.000°K

PID & MHP

 

Fluid Heater

50.00

 

Proportional (P)

50

50
 

Integral (I)

20

20
 

Derivative (D)

1

0.000
 

Manual Output

0.000%

0.000%

Curve Entry:

(Curve 21 already installed)

21 User 2252

N/A

Math - Input B:

Source

Linear

Temp K
 

Linear Equation

MX+B

MX+B
 

Linear Equation M Value

0.82

0.000
 

Linear Equation X Source

Temp C

Temp K
 

Linear Equation B Source

Value

Value
 

Linear Equation B Value

4.25

0.000
 

Filter

Off

Off

Math - Input A:

Source

Temp K

Temp K
 

Linear Equation

MX+B

MX+B
 

Linear Equation M Value

0.000

0.000
 

Linear Equation X Source

Temp K

Temp K
 

Linear Equation B Source

Value

Value
 

Linear Equation B Value

0.000

0.000
 

Filter

Off

Off

Analog Output

N/A

Off

Off

Interface:

Baud

9600

9600
 

IEEE Address

12

12
 

IEEE Terminators

CR/LF

CR/LF
 

Emulation Mode

331

331

Auto Tune:

Mode

Manual PID

Manual PID

Heater Range:

N/A

Off

Off

Loop:

Selected

1

1

Keypad Locking:

Mode

Unlocked

Unlocked
 

Lock Code

123

123

 

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