Lake Shore Model 330 Autotuning Temperature Controller User’s Manual
Operation
3-3
3.2.1 Input
Type
Press and hold the
Input Type
key to verify internal DIP
switch settings that determine sensor input type as defined
in Table 2-1. When factory-configured, the Model number
corresponds the type of sensor used in each channel of the
controller. The factory configuration appears on the B page
immediately following the title page of this manual. For
example, a Model 330-11 displays:
This display shows that both Channel A and B Sensors are
“SI”, or Silicon Diodes. Other input types are “PT” for
Platinum RTDs, “AS” for GaAlAs Diodes, and “TC” for
Thermocouples. The Input Type display is for information
only; no user changes are available. To change input type,
see Paragraph 5.9.
3.2.2 Channel
The
Channel
key specifies which sensor to use for Sample and Control. While holding the
Channel
key,
press the
s
key to cycle the Sample display between Channel A and B, or the
t
key to cycle the Control
display between Channel A and B. Release when you reach the desired configuration. Depending on the
installation, either Channel may be used for Sample and Control.
3.2.3 Units
The
Units
key gives slightly different display choices depending on the sensor input and model number. All
four models permit selection of temperature displays in kelvin (K) or Celsius (C). The difference lies in sensor
output selection. For silicon and GaAlAs diodes (Models 330-1X and -3X respectively), the additional units
selection is Volts (V). For the Platinum RTDs (Model 330-2X), the additional units selection is ohms (
Ω
). For
the thermocouple (Model 330-4X), the additional units selection is millivolts (mV). Units in K is the default for
all models.
NOTE:
When the display is set to read in V/
Ω
/mV, the Autotune, Ramp, and Zone features will not operate.
The user must return the display to K or C before these features will function.
While holding the
Units
key, press the
s
key to cycle the Sample sensor units and the
t
key to cycle the
Control Sensor between K, C, and V/
Ω
/mV. Sample and Control units need not match.
3.2.4
Thermocouple Temperature Compensation (Model 330-4X Only)
For thermocouple sensors only (Model 330-4X),
temperature compensation also displays when the
Input Type
key is pushed and held (see Paragraph
2.7.2.1.) The display is shown to the right:
In this display, the Channel A thermocouple has
temperature compensation on, while the Channel B
thermocouple has temperature compensation off. To
change temperature compensation status, while holding
the
Input Type
key, press the
s
key to toggle Channel A
temperature compensation on (+) or off (–), or the
t
key
to toggle the Channel B temperature compensation on (+)
or off (–).
Sample
OFF
Control
LOC
Sample
OFF
Control
LOC