Lakeshore Model 340 Temperature Controller

Description        Specification       Ordering Information

Technical Information (319 kB)

LS340.jpg (10711 bytes)
Features
  • Front panel configurable for Lake Shore manufactured or other sensors

  • Supports most diodes. Platinum RTDs and Negative Temperature Coefficient (NTC) resistor sensors

  • Two soft configurable sensor inputs included

  • 100 watt heater output on the first control loop (1 watt on 2nd loop)

  • IEEE-488 and serial interfaces, analog, digital I/O and alarm relays

  • One-button control for all major functions

  • Bright LCD graphic display that is user configurable

Features        Specification       Ordering Information

Technical Information (319 kB)
Description
Lake Shore's Model 340 Temperature Controller is a dual input, dual proportional-integral-derivative (PID) control loop temperature controller that supports diodes, negative temperature coefficient (NTC), and positive temperature coefficient (PTC) RTD sensors. Option cards allow the user to configure the Model 340 for use with one capacitance sensor, two thermocouples, or additional diode/RTD sensor inputs. With measurement resolution and control stability to as low as 0.1 mK and ±0.2 mK, respectively, at 4.2 K with appropriate system design and sensors, the Model 340 Temperature Controller offers high performance across the 0.3 to more than 1000 K temperature range and in difficult sensing conditions, including ionizing radiation and magnetic fields.
The Model 340 has two standard temperature sensor inputs which are front panel configurable for:

Sensor

Temperature Range
Silicon diodes

1.4 K to 475 K
GaAIAs diodes

1.4 K to 500 K
Cernox™

0.3 K to 325 K
Platinum Resistors

14 K to 873 K
Rhodium-iron Resistors

1K to 800 K
Carbon-glass Resistors

1.4 K to 325 K
Germanium Resistors

0.3 K to 100 K
Configuration by sensor type allows the controller to automatically set excitation and signal gain or the user can select the excitation and signal gain (range).
To Lake Shore, ease of control means ease of configuration. The Model 340 provides the user with single-key setting of:
  • Setpoint
  • Heater Range
  • Heater Off
  • Gain (Proportional)
  • Reset (Integral)
  • Rate (Derivative)
  • Loop 1 / Loop 2
Our liquid crystal display (LCD) gives you the ability to configure how results are presented. Any measurement or output can be readily displayed. Our graphical display provides you the ability to configure how results are presented. The display can be set to display one to eight different temperatures simultaneously. The display format can also be configured to display Math functions such as: Minimum, Maximum, Max Deviation, and Mean of the input readings. Besides the main display screen, there are a number of setup screens: Curve Entry, Input Setup, Display Format, SoftCal™, Interface setup and Scan Setup.
The experienced temperature controller user can quickly set key functions without navigating through time consuming menus. For the first time user, a Help key for each function and parameter lets you learn by doing, instead of reading the manual. The 32-bit microprocessor-controlled Model 340 effortlessly creates and stabilizes the experimental conditions you select. And, PC card technology makes it easy to replicate conditions from one day to the next...from one system to another.

Description        Features       Ordering Information

Technical Information (319 kB)
Specifications
Thermometry
Number of Inputs Two included (additional inputs optional)
Measurement Type 4-lead Differential
Sensor Types (included) Silicon Diode, GaAIAs Diode, Platinum RTD, Cernox RTD, Germanium RTD, Carbon-Glass RTD, Ruthenium Oxide, Rhodium Iron, other resistive sensors
Sensor Types (Optional) Thermocouple, Capacitance
Input Accuracy Sensor dependent
A/D Resolution 24-bit analog-to-digital
Update Rate Up to 20 readings/second on an input, 40 readings/second on all inputs
User Curve Storage 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 Two
Control Type Digital PID with manual output
Control Stability Sensor dependent
   

Heater Output (Loop 1 Only)
Heater Output Type Variable DC current source
Heater Output Resolution 18-bit digital-to-analog converter
Max Heater Power 100 W
Max Heater Output Current 2A
Current Limit Settings 2 A, 1 A, 0.5 A, 0.25 A
Heater Output Compliance 50 V
Heater Output Ranges 5 decade steps in power
   

Heater Load
Heater Load Type Resistive
Heater Load Range 10 W to 100 W, 25 W for max heater power
Heater Noise 50 mV + 0.001% of output voltage
   

PID Control Settings
Gain (Proportional) 0-1000 with 0.1 setting resolution
Reset (Integral) 1-1000 with 0.1 setting resolution
Rate (Derivative) 1-1000 seconds with 1 second resolution
Manual Output 0-100% with 0.01% setting resolution
Zone Control Mode 10 temperature zones with control parameters
Ramping Setpoint ramping at user specified rate
Internal Program 100 program steps
   

Front Panel
Display Type Graphic LCD with fluorescent backlight
Number of Input Displays One to eight
Display units Temperature in K, °C, or sensor units
Display Resolution Input Temperature 0.0001 K below 10 K, 0.001 K above 10 K
Display Resolution Sensor Units Sensor dependent, to six digits
Setpoint Setting Resolution Same as display resolution (actual resolution is sensor dependent)
Heater Output Display Numeric display in percent of full scale for power or current. Bar graph display of Heater Output available
Keypad Numeric plus special function
Curve Entry Front panel curve entry
   

Interfaces

IEEE-488.2 Interface SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Serial Interface RS-232C electrical format, 19,200 baud, RJ-11 connector
Analog Outputs  Temperature monitor or Loop 2 control output
Number Two
Voltage Range + 10 volts
Resolution 1.25 mV
Maximum Current 0.1 amperes
Minimum Load 100 W
Alarm Type High and low alarm for each input
Alarm Actuators Audible beeper or relays
Relays  
Number Two
Contacts Available Normally open (N.O.), normally closed (N.C.), and common
Contact Rating 30 VDC at 2 A
Digital I/O 5 inputs and 5 outputs. TTL voltage level compatible
Data Card PC card Type II slot used for curve transfer and setup storage
   
General
Ambient Temperature Range 20-30°C (68-86°F) for specified accuracy; 15-35°C (59-95°F) for reduced accuracy
Power Requirements 100, 120, 220, 240 VAC (+ 5%, -10%), 50 or 60 Hz; 200 VA
Enclosure Type Full 19-inch rack mount
Size 431.8 mm x 88.9 mm x 381 mm (17" x 3.5" x 15")
Weight 11.4 kilograms (25 pounds)
   

Description        Specification       Features

Technical Information (319 kB)
Ordering Information
Model Number 340 Temperature Controller
   
Options  
8001 CalCurve™ (requires calibrated sensor)
3462 Two additional standard inputs
3464 Two thermocouple inputs
3465 One Capacitance
   

Features           Description       Specification       Ordering Information

Technical Information (319 kB)

 
Advanced Research Systems, Inc.
7476 Industrial Park Way, Macungie, PA 18062
Tel: 610 967 2120 Fax: 610 967 2395
E mail ars@arscryo.com