Lake Shore Model 331 Temperature Controller User’s Manual
CHAPTER 4
OPERATION
4.0 GENERAL
This chapter describes Model 331 Temperature Controller operation. A definition of front panel controls
is provided in Paragraph 4.1. Turning power on is described in Paragraph 4.2. Paragraphs 4.3 thru 4.20
describe operation of instrument features. Instrument default settings are provided in Paragraph 4.21.
Advanced operation is described in Chapter 5. Computer interface operation is detailed in Chapter 6.
4.1
FRONT PANEL DESCRIPTION
This paragraph provides a description of the front panel controls and indicators for the Model 331.
4.1.1 Keypad
Definitions
An abbreviated description of each key is provided as follows. A more detailed description of each
function is provided in subsequent paragraphs. See Figure 4-1.
AutoTune
Allows selection of closed loop tuning mode: AutoTune PID, PI, P, Manual PID, or
Zone for the currently selected loop. Refer to Paragraph 4.9.
Loop
Toggles the front panel display and key functions between Loop 1 and 2. Operates
with: Control Setup, Setpoint, PID/MHP, Zone Settings, AutoTune, Heater Range,
and Heater Off. Refer to Paragraph 4.6.1.
Heater Range
For Loop 1, allows selection of High (50 W), Medium (5 W), or Low (0.5 W) heater
range. For Loop 2, allows selection of Heater On/Off. Refer to Paragraph 4.13.
Heater Off
Turns the heater off for Loop 1 or turns the control output off for Loop 2. Refer to
Paragraph 4.13.
C
o
ntr
o
l A
C
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ntr
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l B
Tune
R
a
m
p
Rem
o
te
Al
a
rm
C
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ntr
o
l
Setu
p
Set
po
int
Z
o
ne
Settin
g
PID/
MHP
In
p
ut
Setu
p
Curve
Entry
M
a
th
Al
a
rm
An
a
l
og
O
ut
p
ut
Rem
o
te/
L
o
c
a
l
Interf
a
ce
Esc
ap
e
Enter
Aut
o
Tune
L
oop
He
a
ter
R
a
n
g
e
He
a
ter
O
ff
331 Tem
p
er
a
ture C
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ntr
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ller
LakeShore
1
2
3
4
5
+/
6
7
8
9
0
Dis
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l
a
y
F
o
rm
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t
C331-1-1.eps
Figure 4-1. Model 331 Front Panel
Operation
4-1
