Lake Shore Model 331 Temperature Controller User’s Manual
Line input assembly
Serial (RS-232C) I/O (DTE)
Heater output
IEEE-488 interface
Terminal block (for relays and analog output)
Sensor input connectors
Figure 1-1. Model 331S Rear Panel Connections
Configurable Display
Both versions of the Model 331 include a bright vacuum fluorescent display that simultaneously
displays up to four readings. Display data includes input and source annunciators for each reading. All
four display locations can be configured by the user. Data from either input may be assigned to any of
the four locations; the user’s choice of temperature, sensor units, maximum, minimum, or linear
equation results can be displayed. Heater range and control output as current or power can also be
continuously displayed for immediate feedback on control operation.
Normal (Default) Display Configuration
The display provides four reading locations. Readings from each input and the control setpoint can be
expressed in any combination of temperature or sensor units, with heater output expressed as a
percent of full scale current or power.
Flexible Configuration
Reading locations can be configured by the user to meet application needs. The character preceding
the reading indicates input A or B or setpoint S. The character following the reading indicates
measurement units or the math function in use.
Curve Entry
The Model 331 display offers the flexibility to support curve, SoftCal™, and zone entry. Curve entry
may be performed accurately and to full resolution via the display and keypad as well as computer
interface.
Introduction
1-3
