Lake Shore Model 321 Autotuning Temperature Controller User’s Manual
1-4
Introduction
Table 1-2. Model 321 Specifications
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Thermometry:
Number of Inputs:
One
Sensor Types:
Model 321-01 – Silicon Diode
Model 321-02 – Platinum RTD
Model 321-04 – Thermocouple
Accuracy:
Based on Model and Sensor Type (Refer to Table 1-1)
Update Rate:
1 second
Precision Curve Storage:
One 97 point curve entered via Serial Interface
SoftCal™:
Entered in voltage or temperature
Control:
Control Type:
Digital, three term PID with Autotuning
Automatic Control Mode:
P, PI, or PID control, user selectable
Manual Control Mode:
Gain (
P
roportional) 1-999, Reset (
I
ntegral) 1-999 sec.,
and Rate (
D
erivative) 0 - 200%
Control Stability:
Better than ±0.1 K in a properly designed system for diode and
platinum sensors
Setpoint Resolution:
0.1 K or °C
Heater Output Type:
Analog DC Current Source
Heater Setting Resolution:
15 bit
Heater Ranges:
25 W, 2.5 W
Max Power To Heater:
25 W
Max Current To Heater:
1 A
Heater Output Compliance:
25 V
Heater Load:
25
Ω
, 25 W required for full power
Heater Noise:
0.005% of full scale power
Ramp Rate:
0.1 to 99.9 K/min
Analog Output:
Default Settings:
Range:
0 to 10 volts at 1 mA max
Default Output:
10 mV/K, 0
–
10 V, 0
–
1000 K
Resolution:
1.22 mV, 0.122 K
Accuracy:
±0.04% of full scale measurement accuracy
Programmable Settings:
Range:
0 V = user defined minimum temperature in kelvin
10 V = user defined maximum temperature in kelvin
Minimum temperature resolution is 0.1 K
Front Panel:
Display:
2 row by 16 character LCD
Display Units:
Temperature in K or °C. Sensor units in volts (321-01),
ohms (321-02), or millivolts (321-04)
Temperature Resolution:
0.1 K or °C
Sensor Units Resolution:
5 digits
Keypad: Numeric
keypad
Interface:
Serial Interface:
300 or 1200 baud, RJ-11 connector
(RS-232C electrical standard)
General:
Ambient Temperature Range:
20 to 30 °C (68 °F to 86 °F), or with reduced accuracy in range
15 °C to 35 °C (59 °F to 95 °F)
Power Requirements:
90
–
110, 105
–
125, or 210
–
250 VAC, 50 or 60 Hz; 65 watts
Size:
217 mm wide
×
90 mm high
×
317 mm deep
(8.5
×
3.5
×
12.5 inches), half-rack package
Weight:
2.7 kilograms (6 pounds)
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