Lake Shore Model 325 Temperature Controller User’s Manual
Operation 4-1
CHAPTER 4
OPERATION
4.0 GENERAL
This chapter provides instructions for the general operating features of the Model 325 Temperature Controller. Advanced
operation is in Chapter 5. Computer interface instructions are in Chapter 6.
4.1 FRONT PANEL DESCRIPTION
This section provides a description of the front panel controls and indicators for the Model 325.
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 sections. 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 Section 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 Section 4.6.1.
Heater Range For Loop 1, allows selection of High (25 W) or Low (2.5 W) heater range. For Loop 2, allows
selection of Heater On/Off. Refer to Section 4.13.
Heater Off Turns the heater off for Loop 1 or turns the control output off for Loop 2. Refer to Section 4.13.
Control Setup Allows selection of control input, setpoint units, closed or open loop control mode, power up enable,
display of heater output units, setpoint ramp enable, ramp rate for the currently selected loop, and
heater resistance. Refer to Section 4.7 for control setup and Section 4.12 for ramp feature.
Setpoint Allows entry of control setpoint for the currently selected loop. Refer to Section 4.11. A discussion of
the ramp feature is provided in Section 4.12.
Zone Settings Allows entry of up to 10 temperature control zones of customer-entered PID settings and Heater
Ranges for the currently selected loop. Refer to Section 4.10.
325-Front.bmp
Figure 4-1. Model 325 Front Panel
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