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335 temperature controller specifications

Input specifications — sample calculations of typical sensor performance

	Sensor temperature coefficient	Input range	Excitation current	Display resolution	Measurement resolution	Electronic accuracy (at 25 °C)⁶	Measurement temperature coefficient	Electronic control stability¹
Diode	negative	0 V to 2.5 V	10 µA ±0.05%^{2, 3}	100 µV	10 µV	±80 µV ±0.005% of rdg	(10 µV + 0.0005% of rdg)/°C	±20 µV
Diode	negative	0 V to 10 V	10 µA ±0.05%^{2, 3}	1 mV	20 µV	±320 µV ±0.01% of rdg	(20 µV + 0.0005% of rdg)/°C	±40 µV
PTC RTD	positive	0 Ω to 10 Ω	1 mA⁴	1 mΩ	0.2 mΩ	±0.002 Ω ±0.01% of rdg	(0.01 mΩ + 0.001% of rdg)/°C	±0.4 mΩ
		0 Ω to 30 Ω	1 mA⁴	1 mΩ	0.2 mΩ	±0.002 Ω ±0.01% of rdg	(0.03 mΩ + 0.001% of rdg)/°C	±0.4 mΩ
		0 Ω to 100 Ω	1 mA⁴	10 mΩ	2 mΩ	±0.004 Ω ±0.01% of rdg	(0.1 mΩ + 0.001% of rdg)/°C	±4 mΩ
		0 Ω to 300 Ω	1 mA⁴	10 mΩ	2 mΩ	±0.004 Ω ±0.01% of rdg	(0.3 mΩ + 0.001% of rdg)/°C	±4 mΩ
		0 Ω to 1 kΩ	1 mA⁴	100 mΩ	20 mΩ	±0.04 Ω ±0.02% of rdg	(1 mΩ + 0.001% of rdg)/°C	±40 mΩ
		0 Ω to 3 kΩ	1 mA⁴	100 mΩ	20 mΩ	±0.04 Ω ±0.02% of rdg	(3 mΩ + 0.001% of rdg)/°C	±40 mΩ
		0 Ω to 10 kΩ	1 mA⁴	1 Ω	200 mΩ	±0.4 Ω ±0.02% of rdg	(10 mΩ + 0.001% of rdg)/°C	±400 mΩ
NTC RTD 10 mV	negative	0 Ω to 10 Ω	1 mA⁴	1 mΩ	0.15 mΩ	±0.002 Ω ±0.06% of rdg	(0.01 mΩ + 0.001% of rdg)/°C	±0.3 mΩ
		0 Ω to 30 Ω	300 µA⁴	1 mΩ	0.45 mΩ	±0.002 Ω ±0.06% of rdg	(0.03 mΩ + 0.0015% of rdg)/°C	±0.9 mΩ
		0 Ω to 100 Ω	100 µA⁴	10 mΩ	1.5 mΩ	±0.01 Ω ±0.04% of rdg	(0.1 mΩ + 0.001% of rdg)/°C	±3 mΩ
		0 Ω to 300 Ω	30 µA⁴	10 mΩ	4.5 mΩ	±0.01 Ω ±0.04% of rdg	(0.3 mΩ + 0.0015% of rdg)/°C	±9 mΩ
		0 Ω to 1 kΩ	10 µA⁴	100 mΩ	15 mΩ + 0.002% of rdg	±0.1 Ω ±0.04% of rdg	(1 mΩ + 0.001% of rdg)/°C	±30 mΩ ±0.004% of rdg
		0 Ω to 3 kΩ	3 µA⁴	100 mΩ	45 mΩ + 0.002% of rdg	±0.1 Ω ±0.04% of rdg	(3 mΩ + 0.0015% of rdg)/°C	±90 mΩ ±0.004% of rdg
		0 Ω to 10 kΩ	1 µA⁴	1 Ω	150 mΩ + 0.002% of rdg	± 1.0 Ω ±0.04% of rdg	(10 mΩ + 0.001% of rdg)/°C	±300 mΩ ±0.004% of rdg
		0 Ω to 30 kΩ	300 nA⁴	1 Ω	450 mΩ + 0.002% of rdg	±2.0 Ω ±0.04% of rdg	(30 mΩ + 0.0015% of rdg)/°C	±900 mΩ ±0.004% of rdg
		0 Ω to 100 kΩ	100 nA⁴	10 Ω	1.5 Ω + 0.005% of rdg	±10.0 Ω ±0.04% of rdg	(100 mΩ + 0.002% of rdg)/°C	±3 Ω ±0.01% of rdg
Thermocouple	positive	±50 mV	NA	1 µV	0.4 µV	±4.5 µV ±0.07% of rdg⁵	(0.1 µV + 0.001% of rdg)/°C	±0.8 µV

¹ Control stability of the electronics only, in ideal thermal system
² Current source error has negligible effect on measurement accuracy
³ Diode input excitation can be set to 1 mA
⁴ Current source error is removed during calibration
⁵ Accuracy specification does not include errors from room temperature compensation
⁶ Accuracy at T_cal, typically 23.5 °C ±1.5 °C; with current reversal enabled for RTD

Thermometry

Number of inputs	2
Input configuration	Inputs can be configured from the front panel to accept any of the supported input types. Thermocouple inputs require an optional input card that can be installed in the field. Once installed, the thermocouple input can be selected from the front panel like any other input type.
Isolation	Sensor inputs optically isolated from other circuits but not 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 rdg/s on each input, 5 rdg/s when configured as 100 kΩ NTC RTD with reversal on
Autorange	Automatically selects appropriate NTC RTD or PTC RTD range
User curves	Room for 39 200-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
Filter	Averages 2 to 64 input readings

Sensor input configuration

	Diode/RTD	Thermocouple
Measurement type	4-lead differential	2-lead differential, room temperature compensated
Excitation	Constant current with current reversal for RTDs	NA
Supported sensors	Diodes: Silicon, GaAlAs RTDs: 100 Ω Platinum, 1000 Ω Platinum, Germanium, Carbon-Glass, Cernox®, and Rox™	Most thermocouple types
Standard curves	DT-470, DT-670, DT-500D, DT-500-E1, 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	Screw terminals in a ceramic isothermal block

Control

Control outputs	2

Heater Outputs
Control type	Closed loop digital PID with manual heater output or open loop; warm-up mode (output 2 only)
Update rate	10/s
Tuning	Autotune (one loop at a time), PID, PID zones
Control stability	Sensor dependent – see Input Specifications table
PID control parameters
Proportional (gain)	0 to 1000 with 0.1 setting resolution
Integral (reset)	1 to 1000 (1000/s) with 0.1 setting resolution
Derivative (rate)	1 to 200% with 1% resolution
Manual output	0 to 100% with 0.01% setting resolution
Zone control	10 temperature zones with P, I, D, manual heater out, heater range, control channel, ramp rate
Setpoint ramping	0.1 K/min to 100 K/min

Output 1

Type	Variable DC current source
Control modes	Closed loop digital PID with manual output or open loop
D/A resolution	16-bit
	25 Ω setting		50 Ω setting
Max power	75 W*	50 W	50 W
Max current	1.73 A	1.41 A	1 A
Voltage compliance (min)	43.3 V	35.4 V	50 V
Heater load for max power	25 Ω	25 Ω	50 Ω
Heater load range	10 Ω to 100 Ω
Ranges	3 (decade steps in power)
Heater noise	0.12 µA RMS (dominated by line frequency and its harmonics)
Heater connector	Dual banana
Grounding	Output referenced to chassis ground
Safety limits	Curve temperature, power up heater off, short circuit protection
*75 W only available when output 2 is in voltage mode

Output 2

Type	Variable DC current source or voltage source
	Current mode		Voltage mode
Control modes	Closed loop digital PID with manual output, zone, open loop		Closed loop digital PID with manual output, zone, open loop, warm up, monitor out
D/A resolution	15-bit		16-bit (bipolar)/15-bit (unipolar)
	25 Ω setting	50 Ω setting	NA
Max power	25 W	25 W	1 W
Max current	1 A	0.71 A	100 mA
Voltage compliance (min)	25 V	35.4 V	±10 V
Heater load for max power	25 Ω	50 Ω	100 Ω
Heater load range	10 Ω to 100 Ω		100 Ω min (short circuit protected)
Ranges	3 (decade steps in power)		NA
Heater noise	0.12 µA RMS		0.3 mV RMS
Heater connector	Dual banana		Detachable terminal block
Grounding	Output referenced to chassis ground
Safety limits	Curve temperature, power up heater off, short circuit protection

Warm-up heater mode settings (Output 2 voltage only)
Warm-up percentage	0 to 100% with 1% resolution
Warm-up mode	Continuous control or auto-off
Monitor output settings (Output 2 voltage only)
Scale	User selected
Data source	Temperature or sensor units
Settings	Input, source, top of scale, bottom of scale, or manual
Update rate	10/s
Range	±10 V
Resolution	16-bit, 0.3 mV
Accuracy	±2.5 mV
Noise	0.3 mV RMS
Minimum load resistance	100 Ω (short circuit protected)
Connector	Detachable terminal block
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, °C, V, mV, Ω
Reading source	Temperature, sensor units, max and min
Display update rate	2 rdg/s
Temp display resolution	0.001° from 0° to 99.999°, 0.01° from 100° to 999.99°, 0.1° above 1000°
Sensor units display resolution	Sensor dependent, to 5 digits
Other displays	Sensor name, setpoint, heater range, heater output, and PID
Setpoint setting resolution	Same as display resolution (actual resolution in sensor dependent)
Heater output display	Numeric display in percent of full scale for power or current
Heater output resolution	1%
Display annunciators	Control input, alarm, tuning
LED annunciators	Remote, alarm, control outputs
Keypad	25-key silicone elastomer keypad
Front panel features	Front panel curve entry, display brightness control, and keypad lock-out

Interface

IEEE-488.2
Capabilities	SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Reading rate	To 10 rdg/s on each input
Software support	LabVIEW™ driver
USB
Function	Emulates a standard RS-232 serial port
Baud rate	57,600
Connector	B-type USB connector
Reading rate	To 10 rdgs/s on each input
Software support	LabVIEW™ driver
Special interface features	Model 331/332 command emulation mode
Alarms
Number	2, high and low for each input
Data source	Temperature or sensor units
Settings	Source, high setpoint, low setpoint, deadband, latching or non-latching, audible on/off, and visible on/off
Actuators	Display annunciator, beeper, and relays
Relays
Number	2
Contacts	Normally open (NO), normally closed (NC), and common (C)
Contact rating	30 VDC at 3 A
Operation	Activate relays on high, low, or both alarms for any input, or manual mode
Connector	Detachable terminal block

General

Ambient temperature	15 °C to 35 °C at rated accuracy, 5 °C to 40 °C at reduced accuracy
Power requirement	100, 120, 220, 240 VAC, ±10%, 50 or 60 Hz, 210 VA
Size	217 mm W × 90 mm H × 368 mm D; (8.5 in × 3.5 in × 14.5 in), half rack
Weight	5.1 kg (11.3 lb)
Approval	CE mark, RoHS

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335 temperature controller specifications

Input specifications — sample calculations of typical sensor performance

Thermometry

Sensor input configuration

Control

Heater Outputs

Output 1

Output 2

Warm-up heater mode settings (Output 2 voltage only)

Monitor output settings (Output 2 voltage only)

Front panel

Interface

IEEE-488.2

USB

Alarms

Relays

General

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