Lake Shore Model 321 Autotuning Temperature Controller User’s Manual
Introduction
1-1
CHAPTER 1
INTRODUCTION
1.0 GENERAL
This chapter provides an introduction to the Model 321 Autotuning Temperature Controller. The
Model 321 was designed and manufactured in the United States of America by Lake Shore Cryotronics,
Inc. The Model 321 Autotuning Temperature Controller is a microprocessor-based instrument with
digital control of a variable current output. The Model 321 features include the following:
• Three Models Available:
– Model 321-01 – Silicon Diode
– Model 321-02 – Platinum Resistor 100
Ω
– Model 321-04 – Thermocouple
• Thermometry:
– Single Sensor Input
– Differential Input Allows Four-Lead Sensor Measurement
– Nonvolatile Memory Space to Store One Precision Calibration Option Curve
– Nonvolatile Memory Space to Store One SoftCal™ Curve
• Five
Tuning
Modes:
– Autotuning P
– Autotuning PI
– Autotuning PID
– Manual
– Zone (10 Temperature Zones)
• Control:
– Control Stability to ±0.1 K
– Three-Term PID Control Loop
– 25 Watt Heater Power with Two Ranges
– Setpoint Ramping
• Interface:
– Backlit 2 Row by 16 Character LCD for High Visibility
– Display of Sensor Temperature in K, °C, or sensor units in volts, ohms
– Serial Interface (RS-232C Electrical Format)
– Analog Output Corresponding to Temperature
If you have just received your new Model 321, please proceed to Chapter 2 and become familiar with
the installation instructions. Operation is described in Chapter 3. Remote operation is covered in
Chapter 4. Options and accessories are detailed in Chapter 5. Service and calibration procedures are
provided in Chapter 6. For reference, various appendices are included.
We welcome your comments concerning this manual. Although every effort has been made to keep it
free from errors, some may occur. When reporting a specific problem, please describe it briefly and
include the applicable paragraph, figure, table, and page number. Send comments to Lake Shore
Cryotronics, Attn: Technical Publications, 575 McCorkle Blvd, Westerville, Ohio 43082-8888. The
material in this manual is subject to change without notice.
Due to the Lake Shore commitment to continuous product improvement, it is reasonable to expect that
modifications will be made in the Model 321 software with time. Some of these changes are the result
of Customer feedback regarding operation on various cryogenic systems. We encourage you to contact
us with any observations or suggestions which you have regarding the use of this controller. Also,
please return your warranty card
to ensure that any software updates are sent to you.
