Model 332 Cryogenic Temperature Controller

Input Specifications

	Sensor Temperature Coefficient	Input Range	Excitation Current	Display Resolution	Measurement Resolution	Electronic Accuracy	Electronic Control Stability¹²
Diode	negative	0 V to 2.5 V	10 µA ±0.05%^{14, 15}	100 µV	10 µV	±80 µV ±0.005% of rdg	±20 µV
Diode	negative	0 V to 7.5 V	10 µA ±0.05%^{14, 15}	100 µV	20 µV	±80 µV ±0.005% of rdg	±40 µV
PTC RTD	positive	0 W to 250 W	1 mA¹⁶	10 mW	2 mW	±0.004W ±0.01% of rdg	±4 mW
	positive	0 W to 500 W	1 mA¹⁶	10 mW	2 mW	±0.004W ±0.01% of rdg	±4 mW
	positive	0 W to 5000 W	1 mA¹⁶	100 mW	20 mW	±0.004W ±0.02% of rdg	±40 mW
NTC RTD	negative	0 W to 75 W	1 mA¹⁶	1 mW	0.3 mW + 0.000% of rdg	±0.001 W ±0.04% of rdg	±0.6 mW
	negative	0 W to 750 W	100 µA¹⁶	10 mW	3 mW + 0.001% of rdg	±0.01 W ±0.04% of rdg	±6 W ±0.002% of rdg
	negative	0 W to 7500 W	10 µA¹⁶	100 mW	20 mW + 0.001% of rdg	±0.1 W ±0.04% of rdg	±40 mW ±0.002% of rdg
	negative	0 W to 75000 W	1 µA¹⁶	1 W	0.15 W + 0.003% of rdg	±1.0 W ±0.04% of rdg	±0.3 W ±0.006% of rdg
Thermocouple	positive	±25 mV	NA	1 µV	0.4 µV	±1 µV ±0.05% of rdg¹⁷	0.8 µV
Thermocouple	positive	±50 mV	NA	1 µV	0.4 µV	±1 µV ±0.05% of rdg¹⁷	0.8 µV
¹³ Control stability of the electronics only, in an ideal thermal system ¹⁴ Current source error has negligible effect on measurement accuracy ¹⁵ Diode input excitation current can be set to 1 mA – refer to the Model 331 user manual for details ¹⁶ Current source error is removed during calibration ¹⁷ Accuracy specification does not include errors from room temperature compensation

Thermometry
Number of inputs	2
Input configuration	Each input is factory configured as either diode/RTD or thermocouples
Isolation	Sensor inputs optically isolated from other circuits but not from each other
A/D resolution	24-bit
Input accuracy	Sensor dependent – refer to Input Specifications table
Measurement resolution	Sensor dependent – refer to Input Specifications table
Maximum update rate	10 readings per s on each input with the following exceptions: 5 readings per s when configured as 75 kW NTC RTD with reversal on, 5 readings per s on input A when configured as thermocouple
Autorange	Automatically selects appropriate NTC RTD range
User curves	Room for 20 200-point CalCurves™ or user curves
SoftCal™	Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K; improves accuracy of platinum RTDs to ±0.25 K from 70 K to 325 K; stored as user curves
Math	Maximum and minimum, and linear equation (Mx + B) or M(x + B)
Filter	Averages 2 to 64 input readings

Sensor Input Configuration

	Diode/RTD	Thermocouple
Measurement type	4-lead differential	2-lead, room temperature compensated
Excitation	Constant current with current reversal for RTDs	NA
Supported sensors	Diodes: Silicon, GaAlAs RTDs: 100 W Platinum, 1000 W Platinum, Germanium, Carbon-Glass, Cernox™, and Rox™	Most thermocouple types
Standard curves	DT-470, DT-500D, DT-670, PT-100, PT-1000, RX-102A, RX-202A	Type E, Type K, Type T AuFe 0.07% vs. Cr, AuFe 0.03% vs Cr,
Input connector	6-pin DIN	Ceramic isothermal block

Control
Control loops	2
Control type	Closed-loop digital PID with manual heater output or open loop
Tuning	Autotune (one loop at a time), manual PID, zones
Control stability	Sensor dependent – to 2× measurement resolution (in an ideal thermal system)
PID control settings
Proportional (gain)	0 to 1000 with 0.1 setting resolution
Integral (reset)	1 to 1000 (1000 per s) with 0.1 setting resolution
Derivative (rate)	1% to 200% with 1% setting resolution
Manual output	0% to 100% with 0.001% setting resolution
Zone control	10 temperature zones with P, I, D, manual heater out, and heater range
Setpoint ramping	0.1 K per min to 100 K per min
Safety limits	Curve temperature, power up heater off, and short-circuit protection

Heater Output

	Loop 1	Loop 2
Heater output type	Variable DC current source	Variable DC voltage source
Heater output D/A resolution	18-bit	16-bit
Max heater power	50 W	10 W
Max heater output current	1 A	1 A
Heater output complaince	50 V	10 V
Heater source impedance	N/A	0.1 W maximum
Heater output ranges	3 decade steps in power	1
Heater load type	Resistive	Resistive
Heater load range	10 W to 100 W recommended	10 W minimum
Heater load for max power	50 W	10 W
Heater noise (<1 kHz) RMS	50 µV + 0.017% of output voltage	<0.3 mV
Isolation	Optical isolation between output and other circuits	None
Heater connector	Dual banana	Detachable terminal block

Loop 1 Full Scale Heater Power at Typical Resistance

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Front Panel
Display	2 line by 20 character, 9 mm character height, vacuum fluorescent display
Number of reading displays	1 to 4
Display Units	K, ºC, V, mV and W
Reading source	Temperature, sensor units, max, min, and linear equation
Display update rate	All readings twice per s
Temp display resolution	0.001º from 0º to 99.999º, 0.01º from 100º to 999.99º, 0.1º above 1000º
Sensor units display resolution	Sensor dependent to 5 digits
Other displays	Setpoint, heater range, and heater output (user selected)
Setpoint setting resolution	Same as display resolution (actual resolution is sensor dependent)
Heater output display	Numerical or graphical display in percent of full scale for power or current
Heater output resolution	1% numeric or 2% graphical
Display annunciators	Control input, remote, alarm, tuning, ramp, max, min, and linear
Keypad	20 full-travel keys, numeric and specific functions
Front panel features	Front panel curve entry, display brightness control, and keypad lock-out

Interfaces
IEEE-488.2 interface
Features	SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Reading rate	To 10 readings per s on each point
Software Support	LabVIEW™ driver
Serial interface
Electrical format	RS-232C
Max baud rate	9600 baud
Connector	9-pin D-sub
Reading rate	To 10 readings per s on each input (at 9600 baud)
Special interface features	Model 330 command emulation mode
Alarms
Number	4: high and low for each input
Data source	Temperature, sensor units, and linear equation
Settings	Source, high setpoint, low setpoint, deadband, latching or non-latching, and audible on/off
Actuators	Display, annunciator, beeper, and relays
Relays
Number	2
Contacts	Normally open (NO), normally closed (NC), and (C) common
Contact Rating	30 VDC at 5 A
Operation	Activate relays on high, low or both alarms for either input or manual
Connector	Detachable terminal block
Analog voltage outputs (when not used as control loop 2 output)
Scale	User selected
Update rate	10 readings per s
Data source	Temperature, sensor units, and linear equation
Settings	Input, source, top of scale, bottom of scale, or manual
Range	±10 V
Resolution	0.3 mV
Accuracy	±2.5 mV
Max output power	1 W (jumper selected)
Min load resistance	100 W (short-circuit protected)
Source impedance	0.01 W

General
Ambient temp range	15 °C to 35°C at rated accuracy, 10 ºC to 40 ºC at reduced accuracy
Power requirements	100, 120, 220, 240 VAC (+6%, -10%), 50 or 60 Hz, 150 VA
Size	216 mm W × 89 mm H × 368 mm D (8.5 in × 3.5 in × 14.5 in), half rack
Weight	4.8 kg (10.5 lb)
Approval	CE mark

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