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Lakeshore 231 User Manual

Temperature transmitter
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Model 231 / 231P
Temperature Transmitter
For Use With The Following Lake Shore Sensors:
Model DT-414 Unencapsulated Silicon Diode Temperature Sensors
Series DT-420 Miniature Silicon Diode Temperature Sensors
Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake
Shore Cryotronics, Inc. No government or other contractual support or relationship whatsoever has existed which in
any way affects or mitigates proprietary rights of Lake Shore Cryotronics, Inc. in these developments. Methods and
apparatus disclosed herein may be subject to U.S. Patents existing or applied for. Lake Shore Cryotronics, Inc.
reserves the right to add, improve, modify, or withdraw functions, design modifications, or products at any time
without notice. Lake Shore shall not be liable for errors contained herein or for incidental or consequential damages
in connection with furnishing, performance, or use of this material.
Rev. 1.8
User's Manual
Includes Coverage for:
Model 2308-01 Benchtop Enclosure
Model 2308-12 VMEbus Rackmount Case
Series DT-470 Silicon Diode Temperature Sensors
Series DT-471 Silicon Diode Temperature Sensors
Series DT-670 Silicon Diode Temperature Sensors
Series PT-100 Platinum Resistance Thermometers
Series TG-120 GaAlAs Diode Temperature Sensors
Lake Shore Cryotronics, Inc.
575 McCorkle Boulevard
Westerville, Ohio 43082-8888 USA
E-Mail Addresses:
sales@lakeshore.com
service@lakeshore.com
Visit Our Website:
www.lakeshore.com
Fax: (614) 891-1392
Telephone: (614) 891-2243
P/N 119-021
03 October 2013

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Summary of Contents for Lakeshore 231

  • Page 1 User’s Manual Model 231 / 231P Temperature Transmitter Includes Coverage for: Model 2308-01 Benchtop Enclosure Model 2308-12 VMEbus Rackmount Case For Use With The Following Lake Shore Sensors: Model DT-414 Unencapsulated Silicon Diode Temperature Sensors Series DT-420 Miniature Silicon Diode Temperature Sensors...
  • Page 2 Lake Shore Model 231 User’s Manual LIMITED WARRANTY STATEMENT – WARRANTY PERIOD: THREE (3) YEAR 1. Lake Shore warrants that products manufactured by Lake Shore (the "Product") will be free from defects in materials and workmanship for three years from the date of Purchaser's physical receipt of the Product (the "Warranty Period").
  • Page 3 or other damages (including lost profit, lost data, or downtime costs) arising out of the use, inability to use or result of use of the product, whether based in warranty, contract, tort or other legal theory, regardless whether or not Lake Shore has been advised of the possibility of such damages.
  • Page 5 Lake Shore Model 231 User’s Manual...

  • Page 7: Table Of Contents

    Lake Shore Model 231 User’s Manual TABLE OF CONTENTS Chapter/Paragraph Title Page INTRODUCTION ................1-1 General ................1-1 Model 231 System Description ........1-1 Single Enclosure Case Description ........ 1-6 Multiple Unit Enclosure Case Description ...... 1-7 INSTALLATION ................2-1 General ................
  • Page 8 Enclosures ..............5-1 Options................5-1 Accessories ..............5-2 Wires ................5-2 Sensors ................5-3 Special Equipment ............5-3 APPENDIX A – MODEL 231 CURVE TABLES ......... A-1 APPENDIX B – GLOSSARY OF TERMINOLOGY ......B-1 LIST OF ILLUSTRATIONS Figure No. Title Page Typical Model 231 Front Panel..........

  • Page 9: Introduction

    The Lake Shore Series TG-120 GaAlAs diodes operate in a low to moderate magnetic field. Excited with a 10 µA current source from the Model 231, the sensors produce a voltage that depends on temperature. A microcontroller reads the voltage through an A/D converter and translates it into temperature.

  • Page 10: Typical Model 231 Front Panel

    The +5 VDC can also be supplied from the pins on the VME bus connector. Mechanical mounting is easy because the Model 231 is built on a standard size VME card. It fits directly into a single height (3U) VME card holder. The transmitter does not use the electrical bus format, only its physical shape and power supply.
  • Page 11 Lake Shore Model 231 User’s Manual Table 1-1. Model 231 Input Specifications Thermometry: Number of Inputs: One input Measurement Type: Four-lead differential Sensor Type: Silicon diode, GaAlAs diode (to 5V) Sensor Temp. Coefficient: Negative Sensor Units: Volt (V) Input Range: 0 – 5 volts Sensor Excitation: 10 µA ±0.1% DC current...
  • Page 12 Lake Shore Model 231 User’s Manual Table 1-2. Model 231P Input Specifications Thermometry: Number of Inputs: One input Measurement Type: Four-lead differential Sensor Type: Platinum Sensor Temp. Coefficient: Positive Sensor Units: Ohm () Input Range: 0 – 312  Sensor Excitation: 500 µA ±0.02% DC current Update Rate: 5 readings per second.

  • Page 13: Model 231 & 231P Output Specifications

    Lake Shore Model 231 User’s Manual Table 1-3. Model 231 and 231P Output Specifications Output: Number of Outputs: One Output Type: Current source, isolated from power source but not sensor input Output Range: 4 – 20 mA or 0 – 20 mA (for 0 – 10 V with provided 500 , 0.02%, 25 ppm resistor)

  • Page 14: General

    Lake Shore Model 231 User’s Manual Table 1-3 Model 231 & 231P Output Specifications (Continued) General: Ambient Temperature Range: 15 – 35 °C Power Requirement: +5 (±0.25) VDC, 500 mA Size: 100 mm high × 160 mm deep × 30.5 mm wide Mounting: VME end panel and back plane.

  • Page 15: Multiple Unit Enclosure Case Description

    Lake Shore Model 231 User’s Manual MULTIPLE UNIT ENCLOSURE CASE DESCRIPTION The Model 2308-12 VMEbus Rackmount Case holds up to 12 Model 231 units. A +5 VDC power supply with universal input is provided with the case. Specifications and typical dimensions of the case are shown below. Refer to Paragraph 2.5 for further information on the built-in power supply.

  • Page 16: Multiple Unit Case Physical Dimensions

    Lake Shore Model 231 User’s Manual Figure 1-3. Typical Multiple Unit Case Physical Dimensions Introduction...

  • Page 17: Installation

    (immediately behind the title page). REPACKAGING FOR SHIPMENT To return the Model 231 or accessories for repair or replacement, obtain a Return Goods Authorization (RGA) number from Technical Service in the United States, or from the authorized sales/service representative from which the product was purchased.

  • Page 18: Sensor Installation Recommendations

    Lake Shore Model 231 User’s Manual SENSOR INSTALLATION RECOMMENDATIONS Refer to the Lake Shore Product Catalog for installation details and sensor specifications. Call Lake Shore for copies of application notes or sensor installation questions. Below are general recommendations on sensor installation: 1.

  • Page 19: Four-Lead Measurements

    Lake Shore Model 231 User’s Manual 2.3.1.2 Four-Lead Measurement All sensors, both two-lead and four-lead devices, can be measured in a four-lead configuration to eliminate the effects of lead Four-Lead resistance. The exact point at which the Diode connecting leads solder to the two-lead V–...

  • Page 20: Measurement Errors Due To Ac Noise

    Lake Shore Model 231 User’s Manual sensor through the base. A thin braze joint around the sides of the SD package electrically connect to the sensing element. Avoid contact to the sides with any electrically conductive material. When installing the sensor, make sure there are no electrical shorts or current leakage paths between the leads or between the leads and ground.

  • Page 21: Sensor Curve Definition

    Shore Product Catalog or contact Lake Shore for further information. SENSOR CURVE DEFINITION Model 231 sensor curves include Curve 10, DT-670, Platinum Curve (DIN 43760), and a factory installed CalCurve for a calibrated sensor. After selecting the proper curve, refer to Paragraph 3.1 to set the Model 231 DIP switch.

  • Page 22: Power Connections

    Aluminum-Arsenide Diode Temperature Sensor. POWER CONNECTIONS The Model 231 is powered by the +5 VDC supply in the VME rack or an external power supply. The voltage must be regulated to within ±0.25 VDC. Each Model 231 draws up to 500 mA from the supply. The external power supply connector must be S-760 or S-765 Switchcraft (or equivalent) plug (0.218 inch O.D., accepts 0.08 inch diameter pin) with the +5 VDC on the...

  • Page 23: Typical Wall Plug-In Power Supply

    Lake Shore Model 231 User’s Manual The Model 2308-10 VMEbus rackmount case has a built-in power supply for up to twelve Model 231s. The built-in power supply has a universal input: 85 to 265 VAC, 47 to 440 Hz, 60 watts.
  • Page 24 Lake Shore Model 231 User’s Manual This Page Intentionally Left Blank Installation...

  • Page 25: Operation

    (ON). Units ship from the factory with the DIP switch set to RANGE4 closed (0 to 325 K). For the Model 231, set the CURVE switch to open for the DT470 Curve 10 or the CalCurve option (if present) or closed for the DT-670 Curve. For the Model 231P, set the CURVE switch to open for the platinum curve or closed for the CalCurve option.

  • Page 26: Output To Temperature Conversion

    Lake Shore Model 231 User’s Manual Current/Voltage (I/V) OUT is for selection of proper output type. Open is for 4 – 20 mA and closed is for 0 – 20 mA. The 4 – 20 mA is an industry standard, while the 0 –...

  • Page 27: Service

    500 mA. Also verify that OUT+ and SHIELD are not connected to each other. Due to extensive protection circuitry installed in Model 231, all the above problems eventually cause the 0.5 A slow blow fuse to burn out. After correction, replace the blown fuse with identical size and type.

  • Page 28: Output Is Incorrect Value (Large Error)

    Can be caused by incorrect sensor wiring. To test wiring, place voltmeter between SENS V+ and SENS V– connection. With sensor connected, power up the Model 231. With the sensor at room temperature, the voltmeter should read about 0.5 VDC for a diode sensor, or about 55 mV for a platinum sensor.

  • Page 29: Calibration

    CALIBRATION This section covers various aspects of Model 231 calibration: Required Test Equipment (Paragraph 4.3.1), Reference Calibration (Paragraph 4.3.2), and Calibration (Paragraph 4.3.3). See Figure 4-3 for the Model 231 PCB layout. Allow 5 minutes warm-up before calibration. 4.3.1 Required Test Equipment A digital voltmeter (DVM) that measures DC voltage between 0 and 10 V accurately to 0.0001 V.

  • Page 30: Reference Calibration

    Reference Calibration Perform this reference calibration before output calibration. Connect DVM negative lead to Model 231 reference ground (REF GND) on TP2, and positive lead to VREF on TP3. Adjust trimpot R33, VREF TRIM, until DVM reads 2.5000 V ±0.0001 V.

  • Page 31: Output Calibration

    4.3.3 Output Calibration Connect 500 , 0.02% resistor to Model 231 pins OUT+ and OUT–. Use jumper wires 1 and 2 to short V+ to I+ and V– to I–. Record configuration of DIP Switch (S1) positions 1 thru 6.
  • Page 32 Lake Shore Model 231 User’s Manual This Page Intentionally Left Blank Service...

  • Page 33: Options And Accessories

    Lake Shore Model 231 User’s Manual CHAPTER 5 OPTIONS AND ACCESSORIES GENERAL This chapter lists Model 231 enclosures, options, accessories, sensors, wires, and special equipment. ENCLOSURES Model Description Of Enclosure 2308-1 Benchtop Enclosure for one Model 231 PCB. VMEbus rack mount case with built-in power supply for 2308-12 up to 12 Model 231s.

  • Page 34: Accessories

    Lake Shore Model 231 User’s Manual ACCESSORIES Model Description Of Accessory Model 231 User’s Manual MAN-231 106-739 Input Terminal Mating Connector 2007-12 Wall Plug-in Power Supply, 120 V 60 Hz power source 2007-22 Wall Plug-in Power Supply, 230 V 50 Hz power source Resistor, Precision, 500 , ±0.02%...

  • Page 35: Sensors

    Lake Shore Model 231 User’s Manual SENSORS Sensor No. Description Of Sensor Unencapsulated Silicon Diode mounted on a flat substrate. This chip-level sensor offers minimal thermal mass and minimal physical Series DT-414 size. Die attachment is with silver epoxy. The exposed gold wires are fragile.
  • Page 36 Lake Shore Model 231 User’s Manual This Page Intentionally Left Blank Options & Accessories...

  • Page 37: Appendix A - Model 231 Curve Tables

    Lake Shore Model 231 User’s Manual APPENDIX A MODEL 231 CURVE TABLES Table A-1. Lake Shore Standard Diode Curves Break- DT-670 Curve Curve 10 point No. Temp.(K) Voltage Temp.(K) Voltage 499.9 0.00000 499.9 0.00000 475.0 0.14703 475.0 0.09032 445.0 0.21870 460.0...
  • Page 38 Lake Shore Model 231 User’s Manual Table A-2. Series PT-100 Platinum Resistance Curve Temperature in kelvin (K), resistance in ohms (), and slope in ohms per kelvin (/K). Temperature coefficient (237.15 – 373.15): 0.00385 //K. Conforms to DIN 43760:1980; IEC 751:1983: and BS 1904:1984.
  • Page 39 Lake Shore Model 231 User’s Manual APPENDIX B GLOSSARY OF TERMINOLOGY absolute zero. The temperature of –273.15 °C, or –459.67 °F, or 0 K, thought to be the temperature at which molecular motion vanishes and a body would have no heat energy.
  • Page 40 Lake Shore Model 231 User’s Manual drift, instrument. An undesired but relatively slow change in output over a period of time, with a fixed reference input. Note: Drift is usually expressed in percent of the maximum rated value of the variable being measured.
  • Page 41 Lake Shore Model 231 User’s Manual Kelvin Scale. The Kelvin Thermodynamic Temperature Scale is the basis for all international scales, including the ITS-90. It is fixed at two points: the absolute zero of temperature (0 K), and the triple point of water (273.16 K), the equilibrium temperature that pure water reaches in the presence of ice and its own vapor.
  • Page 42 Lake Shore Model 231 User’s Manual probe. A long, thin body containing a sensing element which can be inserted into a system in order to make measurements. Typically, the measurement is localized to the region near the tip of the probe.

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