Contact: info@lakeshore.com Lakeshore.com Search www.lakeshore.com Contact Us Ordering / Pricing Products Home
Add Model 340 Cryogenic Temperature Controller To Cart View Cart
Home > Products > Cryogenic Temperature Instruments > Cryogenic Temperature Controllers > Model 340
 

 Model 340 Cryogenic Temperature Controller
 
 
Input Specifications - click here for sample calculations of typical sensor performance
 
 
Sensor Temperature Coefficient
Input
Range
Excitation
Current
Display
Resolution
Measurement
Resolution
Electronic
Accuracy
Electronic
Control
Stability10
Diode
340/3462
negative
0 V to 2.5 V
10 µA
± 0.05%12, 13
10 µV
10 µV
±80 µV ±0.005% of rdg
20 µV
negative
0 V to 7.5 V
10 µA
± 0.05%12, 13
10 µV
10 µV
±80 µV ±0.01% of rdg
20 µV
PRC RTD
340/3462
positive
0 W to 250 W
1 mA14
1 mW
1 mW
±0.002 W ±0.01% of rdg
2 mW
positive
0 W to 500 W
1 mA14
1 mW
1 mW
±0.002 W ±0.01% of rdg
2 mW
positive
0 W to 2500 W
0.1 mA14
10 mW
10 mW
±0.03 W ±0.02% of rdg
20 mW
NTC RTD
1 mV
340/3462
negative
0 W to 10 W
100 µA14
100 µW
1 mW
±0.02% rng ±0.1% of rdg
2 mW
negative
0 W to 30 W
30 µA14
100 µW
3 mW
±0.02% rng ±0.1% of rdg
6 mW
negative
0 W to 100 W
10 µA14
1 mW
10 mW
±0.02% rng ±0.1% of rdg
20 mW
negative
0 W to 300 W
3 µA14
1 mW
30 mW
±0.02% rng ±0.1% of rdg
60 mW
negative
0 W to 1 kW
1 µA14
10 mW
0.1 W
±0.02% rng ±0.1% of rdg
0.2 W
negative
0 W to 3 kW
300 nA14
10 mW
0.3 W
±0.02% rng ±0.1% of rdg
0.6 W
negative
0 W to 10 kW
100 nA14
0.1 W
1 W
±0.02% rng ±0.1% of rdg
2 W
negative
0 W to 30 kW
30 nA14
0.1 W
3 W
±0.02% rng ±0.1% of rdg
6 W
NTC RTD
10 mV
340/3462
negative
0 W to 30 W
300 µA14
100 µW
300 µW
±0.02% rng ±0.05% of rdg
600 µW
negative
0 W to 100 W
100 µA14
1 mW
1 mW
±0.02% rng ±0.05% of rdg
2 mW
negative
0 W to 300 W
30 µA14
1 mW
3 mW
±0.02% rng ±0.05% of rdg
6 mW
negative
0 W to 1 kW
10 µA14
10 mW
10 mW
±0.02% rng ±0.05% of rdg
20 mW
negative
0 W to 3 kW
3 µA14
10 mW
30 mW
±0.02% rng ±0.05% of rdg
60 mW
negative
0 W to 10 kW
1 µA14
0.1 W
0.1 W
±0.02% rng ±0.05% of rdg
0.2 W
negative
0 W to 30 kW
300 nA14
0.1 W
0.3 W
±0.02% rng ±0.05% of rdg
0.6 W
negative
0 W to 100 kW
100 nA14
1 W
3 W
±0.02% rng ±0.05% of rdg
6 W
negative
0 W to 300 kW
30 nA14
1 W
30 W
±0.02% rng ±0.25% of rdg
60 W
Thermocouple
3464
positive
±25 mV
NA
0.1 µV
0.2 µV
±1 µV ±0.05% of rdg12
0.4 µV
positive
±50 mV
NA
0.1 µV
0.4 µV
±1 µV ±0.05% of rdg12
0.8 µV
Capacitance
3465
positive or negative
0 nF to 150 nF
4.88 kHz
1 V square wave
10 pF
2.0 pF
±50 pF ±0.1% of rdg
4.0 pF
positive or negative
0 nF to 15 nF
4.88 kHz
1 V square wave
1 pF
0.2 pF
±50 pF ±0.1% of rdg
0.4 pF
Diode
3468
negative
0 V to 2.5 V
10 µA
± 0.05%12, 13
100 µV
20 µV
±160 µV ±0.01% of rdg
40 µV
negative
0 V to 7.5 V
10 µA
± 0.05%12, 13
100 µV
20 µV
±160 µV ±0.02% of rdg
40 µV
PTC RTD
3468
positive
0 W to 250 W
1 mA ± 0.3%14
10 mW
2 mW
±0.004 W ±0.02% of rdg
4 mW
positive
0 W to 500 W
1 mA ± 0.3%14
10 mW
2 mW
±0.004 W ±0.02% of rdg
4 mW
positive
0 W to 5000 W
1 mA ± 0.3%14
100 mW
20 mW
±0.06 W ±0.04% of rdg
40 mW
NTC RTD
3468
negative
0 W to 7500 W
10 µA ± 0.05%14
100 mW
50 mW
±0.01 W ±0.04% of rdg
0.1 W
11 Control stability of the electronics only, in an ideal thermal system
12 Current source error has negligible effect on measurement accuracy
13 Diode input excitation current can be set to 1 mA – refer to the Model 331 user manual for details
14 Current source error is removed during calibration
15 Accuracy specification does not include errors from room temperature compensation
 
Thermometry
Number of inputs 2 included (additional inputs optional)
Input configuration Each input is factory configured as diode/RTD. Thermocouple and capacitance are optional and sold as additional input cards.
Isolation Sensor inputs optically isolated from other circuits but not from each other
A/D resolution 24-bit analog-to-digital
Input accuracy Sensor dependent – refer to Input Specifications table
Measurement resolution Sensor dependent – refer to Input Specifications table
Maximum update rate Up to 20 readings per s on an input, 40 readings per s on all inputs
Autorange Automatically selects appropriate NTC RTD range
User curves Forty 200-point CalCurves™, or user curves
SoftCal™ Improves accuracy of DT-470 diode or platinum RTD sensors
Math Maximum and minimum of input readings and linear equation
Filter Averages input readings to quiet display, settable time constant
Control  
Control loops 2
Control type Closed-loop digital PID with manual heater power 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 with 0.1 setting resolution
    Derivative (rate) 1 to 1000 s with 1 s resolution
    Manual output 0 to 100% with 0.01% setting resolution
Zone control 10 temperature zones with P, I, D, manual heater power out, and heater range
Setpoint ramping 0.1 K per min to 100 K per min
Safety limits Setpoint limit, curve temp limits, heater output, slope limit, heater range limit, power up heater off, and short-circuit protection
Heater Output
 
Loop 1
Loop 2
Heater output type
Variable DC current source
Variable DC voltage
Heater output D/A resolution
18-bit
14-bit
Max heater power
100 W
1 W
Max heater output current
2 A
0.1 A
Heater output complaince
50 V
10 V
Heater source impedance
NA
0.01 W
Heater output ranges
5 decade steps in power
1
Heater load type
Resistive
Resistive
Heater load range
10 W to 100 W recommended
100 W minimum
Heater load for max power
25 W
100 W
Heater noise (<1 kHz) RMS
50 µV + 0.001% of output voltage
<0.3 mV
Isolation
Optical isolation between output and other circuits
None
Heater connector
Dual banana
BNC
 
Loop 1 Full Scale Heater Power at Typical Resistance
Heater
Resistance
Heater
Range
Maximum Current
2 A
1 A
0.5 A
0.25 A
10 W
5
40 W
10 W
2.5 W
625 mW
4
4 W
1 W
250 mW
62.5 mW
3
0.4 W
100 mW
25 mW
6.25 mW
2
40 mW
10 mW
2.5 mW
625 µW
1
4 mW
1 mW
250 µW
62.5 µW
25 W
5
100 W
25 W
6.25 W
1.56 W
4
10 W
2.5 W
625 mW
156 mW
3
1 W
250 mW
62.5 mW
15.6 mW
2
100 mW
25 mW
6.25 mW
1.56 mW
1
10 mW
2.5 mW
625 µW
156 µW
50 W
5
50 W
50 W
12.5 W
3.12 W
4
20 W
5 W
1.25 W
312 mW
3
2 W
500 mW
125 mW
31.2 mW
2
200 mW
50 mW
12.5 mW
3.12 mW
1
20 mW
5 mW
1.25 mW
312 µW
 

Extending Temperature Controller Heater Power

It is often necessary to extend the heater power of a cryogenic temperature controller to conduct experiments above room temperature. This diagram illustrates a practical way to increase the control output of the Model 340 to several hundred watts. A programming resistor, Rpgm, is placed across the controller’s heater output current source. As the heater output current changes, a changing voltage is generated across Rpgm. That voltage is used to program a large external power supply. Rpgm should be chosen so that a low current range of the controller can be used. The control output of loop 2 on the Model 340 is a voltage, thus it can be connected directly to the external power supply without Rpgm.

 
Sensor Inputs
Temperature Control
Interface
Configurable Display
Additional Inputs Available For Model 340
Sensor Temperature Range
Typical Sensor Performance
 
...........................................................................................
You may also be interested in...
Sensors
Measure temperatures from <20 mK to over 1,500 K. A wide selection of diodes, RTDs, thermocouples, and mounting packages are available. Click here for more information on cryogenic temperature sensors.
Cryogenic Accessories
Cryogenic and temperature measurement accessories include cable, wire, solder, heaters, insulating and conductive materials, and more. Click here for more information on cryogenic accessories.
 
Sensor Input Configuration
 
 
Diode/RTD
Thermocouple
Capacitance
Measurement type
4-lead
differential
2-lead, room temperature compensated
4-lead
Excitation
Constant current with current reversal for RTDs
NA
4.88 kHz, 1 V square wave
Supported
sensors
Diodes: Silicon, GaAlAs
RTDs: 100 W Platinum, 1000 W Platinum, Germanium, Carbon-Glass, Cernox™, and Rox™
Most thermocouple types
CS-501GR
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,
None
Input
connector
6-pin DIN
Ceramic isothermal block
6-pin DIN
 
Front Panel  
Display Graphic LCD with fluorescent backlight
No. of reading displays 1 to 8
Display Units Temperature in K, ºC, or sensor units
Temp display resolution 0.0001 K below 10 K, 0.001 K above 10 K
Sensor units display resolution Sensor dependent, to 6 digits
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-bar graph display of heater output available
Heater output resolution 0.1% numeric or 2% graphical
Keypad Numeric plus special function
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 20 readings per s
    Software Support National instruments LabVIEW™ driver
Serial interface
    Electrical format RS-232C
    Max baud rate 19,200 baud
    Connector RJ-11
    Reading rate To 20 readings per s
Alarms
    Number Two, high and low, for each installed input
    Data source Temperature, Sensor Units, and Linear Equation
    Settings Source, High and Low Setpoint , 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 common (C)
    Contact Rating 30 VDC at 2 A
    Operation Activate relays on high or low alarms for any input, or manual off/on
    Connector Detachable terminal block
Analog voltage outputs (when not used as control loop 2 output)
    Number 2
    Scale User selected
    Update rate 20 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 1.25 mV
    Accuracy ±2.5 mV
    Max output power 1 W
    Min load resistance 100 W (short-circuit protected)
    Source impedance 0.01 W
Digital I/O 5 inputs and 5 outputs – TTL voltage level compatible
Data card PC card Type II slot used for curve transfer, setup storage, and data-logging
General  
Ambient temp range

20 °C to 30 °C (68 °F to 86 °F) for specified accuracy; 15 °C to 35 °C (59 °F to 95 °F) for reduced accuracy

Power requirements 100, 120, 220, 240 VAC (+5%, -10%), 50 or 60 Hz; 190 VA
Size 432 mm W × 89 mm H × 368 mm D (17 in × 3.5 in × 14.5 in), full rack
Weight 8 kg (17.6 lb) approx.
Approval CE mark
 
3003 Heater Output Conditioner
 

The heater output conditioner is a passive filter which further reduces the already low Model 340 heater output noise. The typical insertion loss for the Model 3003 is 20 dB at or above line frequency, and >40 dB at or above double line frequency. A 144 mm W × 72 mm H × 165 mm D (5.7 in × 2.8 in × 6.5 in) panel mount enclosure houses this option, and it weighs 1.6 kg
(3.5 lb).

 
Model 340 Cryogenic Temperature ControllerProduct Overview Ordering Information for Model 340 Cryogenic Temperature Controller Downloads for Model 340 Cryogenic Temperature Controller
 
 Home     |     Products     |     Ordering/Pricing     |     Search     |     Site Map
 
Privacy Policy | ©2007 Lake Shore Cryotronics, Inc.