231 User`s Manual - Lake Shore Cryotronics, Inc.
Contents
1. Duo Twist High Temperature Cernox Quad Lead Quad Twist Rox SoftCal and Thermox are trademarks of Lake Shore Cryotronics Inc Teflon is a trademark of DuPont De Nemours Copyright 1993 1998 99 2001 2004 2012 13 by Lake Shore Cryotronics Inc All rights reserved No portion of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without express written permission of Lake Shore Rev 1 8 P N 119 021 03 October 2013 Lake Shore Model 231 User s Manual 4 DECLARATION OF CONFORMITY We Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville OH 43082 USA hereby declare that the equipment specified conforms to the following Directives and Standards Application of Council Directives 2004 108 EC EMC Standards to which Conformity is declared EN 55022 2010 EN 61000 6 1 2007 Model Num b wvcsssssscsevessescasmmcenveenaarrme 231 A i j AA r j Ss h 2 7O i J202 Scott Ayer J H Director of Quality and Compliance Position Lake Shore Model 231 User s Manual TABLE OF CONTENTS Chapter Paragraph Title Page 1 gt AINTRODUCTION wisiccistisiseis facie edeeseds civadevertscceiceaceavvececsrssceeevecntens 1 1 1 0 General pie recs iclests hes ertetist Ati a e a ieee 1 1 1 1 Model 231 System Description ceeeeeeeeeeeeeerereees 1 1 1 2 Single Enclos2. Figure 2 1 Typical Wall Plug In Power Supply Installation 2 7 Lake Shore Model 231 User s Manual This Page Intentionally Left Blank 2 8 Installation Lake Shore Model 231 User s Manual CHAPTER 3 OPERATION 3 0 GENERAL This chapter covers Printed Circuit Board PCB DIP Switch Settings in Paragraph 3 1 and Output Current and Voltage to Temperature Conversion in Paragraph 3 2 3 1 PCB DIP SWITCH SETTINGS Before placing the unit into service the Model 231 DIP switch S1 must be properly configured Once an operating range is selected the corresponding range number should be enabled on the Model 231 PCB DIP Switch S1 See Figure 3 1 Select only one range at a time The range is enabled when the switch is closed 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 Unless CalCurve is specified units ship from the factory with the DIP switch set to CURVE open OFF lt ON RANGE1 0 20K RANGE2 0 100 K RANGE1 RANGES 0 200K RANGE4 0 325 K RANGE2 RANGES 0 475 K RANGE3 RANGEG 0 1000 K RANGE Switch Open Range Off RANGE4 Closed Range On RANGES Only active range should
3. 231 User s Manual Table A 2 Series PT 100 Platinum Resistance Curve Temperature in kelvin K resistance in ohms Q and slope in ohms per kelvin Q K Temperature coefficient 237 15 373 15 0 00385 Q Q K Conforms to DIN 43760 1980 IEC 751 1983 and BS 1904 1984 TW no r R 0 C 100 Standard 751 IEC 1983 from 70 K to 1000 K A 2 Curve Tables 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 accuracy The degree of correctness with which a measured value agrees with the true value electronic accuracy The accuracy of an instrument independent of the sensor sensor accuracy The accuracy of a temperature sensor and its associated calibration or its ability to match a standard curve ambient temperature The temperature of the surrounding medium such as gas or liquid which comes into contact with the apparatus anode The terminal that is positive with respect to the other terminal when the diode is biased in the forward direction Anode p gt l Cathode asphyxiant gas A gas which has little or no positive toxic effect but which can bring about unconsciousness and death by displacing air and thus depriving an organism of oxygen calibration To determine by measurement or compariso
4. Institute of Electrical and Electronics Engineers 1993 IBSN 1 55937 240 0 Definitions printed with permission of the IEEE 3 Nelson Robert A Guide For Metric Practice Page BG7 8 Physics Today Eleventh Annual Buyer s Guide August 1994 ISSN 0031 9228 coden PHTOAD B 4 Glossary
5. appropriate This chapter provides a general description with specifications in Paragraph 1 1 single enclosure case description in Paragraph 1 2 and multiple unit enclosure case description in Paragraph 1 3 We welcome comments on this manual Although we try to keep it error free some may occur To report an error describe it briefly and include the appropriate paragraph figure table and page number Send comments to Lake Shore Cryotronics Attn Technical Publications 575 McCorkle Blvd Westerville Ohio 43082 8888 This manual is subject to change without notice 1 1 MODEL 231 GENERAL DESCRIPTION The Model 231 Temperature Transmitter is available as a stand alone unit or for use within either of two enclosures a Model 2308 1 single space enclosure or a Model 2308 12 rackmount case that holds up to 12 units The Model 231 Temperature Transmitter sends temperature data from its position near a sensor to a data acquisition channel or strip chart recorder It operates with Silicon diode or Gallium Aluminum Arsenide GaAlAs diode sensors Lake Shore Silicon diode sensors are accurate over a wide cryogenic temperature range and are interchangeable for some applications The Lake Shore Series TG 120 GaAlAs diodes operate in a low to moderate magnetic field Excited with a 10 pA 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 tran
6. included 500 Q resistor for 0 10 V the following formula converts output voltage to temperature T C x Vout where T temperature in kelvin Vout output voltage and C is aconstant from Table 3 1 depending on temperature Table 3 1 Conversion Parameters for Temperature in K TRANG TEMP ao ema co 3 2 Operation Lake Shore Model 231 User s Manual CHAPTER 4 SERVICE 4 0 GENERAL This chapter cover general troubleshooting in Paragraph 4 1 Model 231 connectors in Paragraph 4 2 and calibration in Paragraph 4 3 4 1 GENERAL TROUBLESHOOTING 4 1 1 No Output On Board LED Off Check that external power supply output is 5 VDC If not replace supply If using the front panel input jack J2 make certain center post of connector coming from power supply is NEGATIVE If not correct wiring If using front panel input jack J2 verify external power supply is regulated at 5 VDC and can supply a minimum of 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 4 1 2 Output Stops Before Reaching Upper Limit Normally caused by too high resistance of output monitoring device Absolute maximum acceptable resistance is 500 Q Also verify that proper range DIP switch is selec
7. lead pair carrying no current 2 3 1 1 Two Lead Measurement Sometimes system constraints dictate two lead measurement Connect the positive terminals V and l together and the negative terminals V and sda together at the instrument then run V two leads to the sensor Expect some loss in accuracy the voltage measured at the voltmeter equals the sum of the sensor voltage and the voltage drop across the connecting leads The exact measurement error depends on sensor sensitivity and variations resulting from changing temperature For example a 10 Q lead resistance results in a 0 1 mV voltage error The resultant temperature error at liquid helium temperature is only 3 mK but because of the lower sensitivity dV dT of the diode at higher temperatures it becomes 10 mK at liquid nitrogen temperature 2 2 Installation Lake Shore Model 231 User s Manual 2 3 1 2 Four Lead Measurement All sensors both two lead and four lead I devices can be measured in a four lead T V configuration to eliminate the effects of lead Four Lead resistance The exact point at which the Diode connecting leads solder to the two lead Ti V sensor normally results in a negligible temperature uncertainty Always use four lead measurement configuration when a Series PT 100 Platinum Sensor is attached to the Model 231P 2 3 2 Connecting Leads To The Sensor Excessive heat flow through connecting leads to any temperatur
8. wires Service 4 3 Lake Shore Model 231 User s Manual 4 3 2 Reference Calibration Perform this reference calibration before output calibration 1 Connect DVM negative lead to Model 231 reference ground REF GND on TP2 and positive lead to VREF on TP3 2 Adjust trimpot R33 VREF TRIM until DVM reads 2 5000 V 0 0001 V 2O0000900 weZ pieog uey Z te D 8 A Re ore lt J D ATddNS HJMOd P 231 4 3 bmp Figure 4 3 Model 231 PCB Layout 4 4 Service Lake Shore Model 231 User s Manual 4 3 3 Output Calibration NO fF ON 500 Q 0 02 OUT OUT SHIELD SENS I SENS V SHIELD SENS V Jumper 2 seer Connect 500 Q 0 02 resistor to Model 231 pins OUT and OUT Use jumper wires 1 and 2 to short V to l and V to l Record configuration of DIP Switch S1 positions 1 thru 6 Place DIP Switch S1 positions 1 through 6 to open Place DVM across 500 Q resistor Reading should be about 10 V Use jumper wire 3 to short V to V Leave Jumpers 1 and 2 in place DVM reading should drop to about 0 V Allow 10 seconds for reading to stabilize Adjust trimpot R25 OUTPUT OFFSET until DVM reading is between 0 and 0 0001 V Remove jumper wire 3 between V and V Leave Jumpers 1 and 2 in place DVM reading should be about 10 V Adjust trimpot R27 OUTPUT GAIN until DVM reading is 10 0000 0 0001 V Re check offset calibration Step 8 and adjust as needed R
9. 8002 231 is for field installations of the CalCurve in an existing Model 231 The CalCurve is required with a Lake Shore TG 120 Series Gallium Aluminum Arsenide Diode Temperature Sensor 2 5 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 sleeve and return on the center pin A wall plug in power supply Model 2007 XX 5 VDC Regulated Power Supply can be used with the Model 231 Power Supply input is based on local power requirements as follows MODEL INPUT POWER 2007 12 120 V 60 Hz power source 2007 22 230 V 50 Hz power source CAUTION Never ground both the sensor and the 4 20 mA output Ground the sensor or the output but not both 2 6 Installation 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 lt 2 25 in 5 72 cm wide 2 0 in 5 1 cm deep AC DC REGULATED POWER SUPPLY INPUT AC 120V 60Hz 12W OUTPUT DC 5V 600mA k y6 w9 p6 Z u sze gt P 6 foot Cord C 231 2 1 eps
10. Apiezon N Grease NOTE Do not apply Stycast epoxy over the DT 470 SD package sensor stress may shift the readings In all cases periodically inspect the sensor mounting to verify good thermal contact to the mounting surface is maintained For the Model 231P Series PT 100 Platinum Sensors follow the same basic procedures for diode type sensors However Platinum sensors have no lead polarity and some of the materials used at cold temperatures will not tolerate the high temperature range of the Platinum sensor 2 3 4 Measurement Errors Due To AC Noise Poorly shielded leads or improperly grounded measurement systems can introduce AC noise into the sensor leads In diode sensors the AC noise shifts the DC voltage measurement due to the diode non linear current voltage characteristics When this occurs measured DC voltage is too low and the corresponding temperature reading is high The measurement error can approach several tenths of a kelvin To determine if this problem exists perform either procedure below 1 Place a capacitor across the diode to shunt induced AC currents Capacitor size depends on the noise frequency If noise is related to power line frequency use a 10 uF capacitor If AC coupled digital noise is suspected digital circuits or interfaces use a 0 1 to 1 uF capacitor In either case if measured DC voltage increases there is induced noise in the measurement system 2 4 Installation Lake Shore Model 231 U
11. C 0 200 K 16 mK C 0 1000 K 80 mK C Introduction Lake Shore Model 231 User s Manual Table 1 3 Model 231 amp 231P Output Specifications Continued General Ambient Temperature Range 15 35 C Power Requirement 5 0 25 VDC 500 mA Size 100 mm high x 160 mm deep x 30 5 mm wide Mounting VME end panel and back plane Transmitter does not use electrical bus format only its physical shape and power supply Note Electronic temperature accuracy in a given temperature range is the sum of temperature accuracies of input and output Sensor calibration errors are not included 1 2 SINGLE ENCLOSURE CASE DESCRIPTION Holds one Model 231 Typical dimensions appear below lt 8 75 inches 22 23 cm Y lt Front TOP VIEW Ow E 5g st no amp Nae Es er i lt 5 5625 inches 14 13 cm 0 1875 inch FRONT VIEW 048m Figure 1 2 Typical Single Enclosure Case Physical Dimensions 1 6 Introduction Lake Shore Model 231 User s Manual 1 3 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 su
12. It is sapphire with gold metalization over a nickel buffer layer The base is electrically isolated from the sensing element and leads make all thermal contact to the Installation 2 3 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 If IMI 7031 varnish or epoxy is used it may soften varnish type lead insulations so that high resistance shunts appear between wires if sufficient time for curing is not allowed Slide Teflon spaghetti tubing over bare leads when the possibility of shorting exists Avoid putting stress on the device leads and allow for thermal contractions that occur during cooling which could fracture a solder joint or lead if installed under tension at room temperature For temporary mounting in cold temperature applications apply a thin layer of Apiezon N Grease between the sensor and sample to enhance thermal contact under slight pressure The preferred method for mounting the DT 470 SD sensor is the Lake Shore CO Adapter CAUTION Lake Shore will not warranty replace any device damaged by user designed clamps or solder mounting For semi permanent mountings use Stycast epoxy instead of
13. 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 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 fl akeShore 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 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 con
14. V 60 Hz power source 2007 22 Wall Plug in Power Supply 230 V 50 Hz power source 103 626 Resistor Precision 500 Q 0 02 5 4 WIRES Description Of Cable Quad Twist Cryogenic Wire Two twisted pairs 9001 005 phosphor bronze wire 36 AWG 0 127 mm 0 005 inch diameter Duo Twist Cryogenic Wire Single twisted pair 9001 006 phosphor bronze wire 36 AWG 0 127 mm 0 005 inch diameter 9001 007 Quad Lead Cryogenic Wire Phosphor bronze wire flat 32 AWG 0 203 mm 0 008 inch diameter 9001 008 Quad Lead Cryogenic Wire Phosphor bronze wire flat 36 AWG 0 127 mm 0 005 inch diameter Any quality dual shield twisted pair wire for dewar to Model 231 connector 5 2 Options amp Accessories Lake Shore Model 231 User s Manual 5 5 SENSORS Description Of Sensor Series DT 414 Series DT 420 Series DT 470 Series DT 471 Series DT 670 Series TG 120 Series PT 100 Unencapsulated Silicon Diode mounted on a flat substrate This chip level sensor offers minimal thermal mass and minimal physical size Die attachment is with silver epoxy The exposed gold wires are fragile Uses the same silicon chip used in the DT 470 Series Miniature Silicon Diode Temperature Sensor Same silicon chip used in the DT 470 Configured for installation on flat surfaces Silicon Diode Temperature Sensor Interchangeable repeatable accurate wide range customized for cryogenics An economical versi
15. al used to make the special Lake Shore TG family of diode temperature sensors gaussian system units A system in which centimeter gram second units are used for electric and magnetic qualities ground A conducting connection whether intentional or accidental by which an electric circuit or equipment is connected to the earth or to some conducting body of relatively large extent that serves in place of the earth Note It is used for establishing and maintaining the potential of the earth or of the conducting body or approximately that potential on conductors connected to it and for conducting ground current to and from the earth or of the conducting body hazard communication standard HCS The OSHA standard cited in 29 CFR 1910 1200 requiring communication of risks from hazardous substances to workers in regulated facilities hertz Hz A unit of frequency equal to one cycle per second international system of units SI A universal coherent system of units in which the following seven units are considered basic meter kilogram second ampere kelvin mole and candela The International System of Units or Systeme International d Unit s SI was promulgated in 1960 by the Eleventh General Conference on Weights and Measures For definition spelling and protocols see Reference 3 for a short convenient guide interpolation table A table listing the output and sensitivity of a sensor at regular or defined points which ma
16. be selected RANGE6 CURVE Switch OPEN CLOSED CURVE 2 Diode Sensor Curve 10 DT 670 Diode Sensor IN OUT N with CalCurve CalCurve DT 670 F Platinum Sensor Platinum Curve Reserved amp can Gelcune Platinum Curve CalCurve Instruments manufactured before y 2002 have the DRC D Diode Curve I V OUT Switch Open 4 20 mA instead of the DT 670 Curve Closed 0 20 mA C 231 3 1 eps Figure 3 1 Model 231 DIP Switch S1 Settings Operation 3 1 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 20 mA is provided to translate output into voltage scaled up to 10 V For a 0 10 V output use the supplied 500 0 02 precision resistor as a load across the OUT and OUT terminals Load resistors less than 500 Q can be used to convert output to voltage using the following formula Unless otherwise specified units ship from the factory with the I V OUT DIP switch set to open 3 2 OUTPUT TO TEMPERATURE CONVERSION The output current or voltage is directly proportional to the temperature reading For the 4 20 mA output the following formula converts output current to temperature T A B x lout where T temperature in kelvin lout output current in mA and A and B are constants from Table 3 1 depending on temperature For the 0 20 mA output using the
17. ceeeeeeeeeeeeneeeeeeeeaes 4 1 4 1 1 No Output On Board LED Off 0 ee eeeeeeseeeeeeeeees 4 1 4 1 2 Output Stops Before Reaching Upper Limit 4 1 4 1 3 Output Is Incorrect Value Small Error e eee 4 1 4 1 4 Output Is Incorrect Value Large Error ceeeee 4 2 4 2 Model 231 Connector Definitions ccceeeereeees 4 2 4 3 Calibration 2 es s005 cesceesieiisel agentes delieeesis desist etiedes 4 3 4 3 1 Test Equipment Required 4 3 4 3 2 Reference Calibration ccccccccsssceceesseeeesesteeesseees 4 4 4 3 3 Output Calibration ccheakieca vtec nice 4 5 Table of Contents Lake Shore Model 231 User s Manual TABLE OF CONTENTS Continued Chapter Paragraph Title Page 5 OPTIONS AND ACCESSORIES ccccssssssscsseeeeessnsssseseeeeees 5 1 5 0 G neral sissies ecbihest hi hecbe ed ieee Sait re 5 1 5 1 Enclos reS snan sna een A ieni erit 5 1 5 2 OPON ieina a ed apa eins oa 5 1 5 3 ACCOSSONES csi cicdecen dhexsbessecncees cede a a arii 5 2 5 4 WSF vices cecuten a ae ete cece aeaa a iA 5 2 5 5 SEHSOMS 255s er at as EEE ET 5 3 5 6 Special Equipment ccccceseceseeceeeeeeeeeeeseeeeeeenenerees 5 3 APPENDIX A MODEL 231 CURVE TABLEG ccssssssseeeee A 1 APPENDIX B GLOSSARY OF TERMINOLOGY ccccceee B 1 LIST OF ILLUSTRATIONS Figure No Title Page 1 1 Typical Model 231 Front Panel 1 2 1 2 Single Enclosure Case Physical Di
18. ch goods of the same description would ordinarily be used b the Product is fit for any particular purpose expressly or impliedly made known to Lake Shore at the time of the conclusion of the contract c the Product is contained or packaged in a manner usual for such goods or in a manner adequate to preserve and protect such goods where it is shipped by someone other than a carrier hired by Lake Shore Lake Shore disclaims any warranties of technological value or of non infringement with respect to the Product and Lake Shore shall have no duty to defend indemnify or hold harmless you from and against any or all damages or costs incurred by you arising from the infringement of patents or trademarks or violation or copyrights by the Product 10 THIS WARRANTY IS NOT TRANSFERRABLE This warranty is not transferrable 11 Except to the extent prohibited by applicable law neither Lake Shore nor any of its subsidiaries affiliates or suppliers will be held liable for direct special incidental consequential 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 Purchaser s use of the Product is entirely at Purchaser s risk Some countries states and provinces do not allow the exclusion of liability fo
19. e check gain calibration Step 11 and adjust as needed Remove all jumpers Return configuration of DIP Switch S1 positions 1 thru 6 to that recorded in Step 3 Calibration is complete Service 4 5 Lake Shore Model 231 User s Manual This Page Intentionally Left Blank 4 6 Service Lake Shore Model 231 User s Manual CHAPTER 5 OPTIONS AND ACCESSORIES 5 0 GENERAL This chapter lists Model 231 enclosures options accessories sensors wires and special equipment 5 1 ENCLOSURES moder Description Ofnciosure 2308 1 Benchtop Enclosure for one Model 231 PCB 2308 12 VMEbus rack mount case with built in power supply for up to 12 Model 231s 5 2 OPTIONS Model Description Of Option Factory Installed CalCurve Allows instrument to more accurately use the calibration data to calculate and output current proportional to temperature Requires a calibrated sensor 8001 231 Field Installed CalCurve Requires field installation of a new microprocessor memory IC Allows instrument to 8002 231 more accurately use the calibration data to calculate and output current proportional to temperature Requires a calibrated sensor Options amp Accessories 5 1 Lake Shore Model 231 User s Manual 5 3 ACCESSORIES Model Description Of Accessory MAN 231 Model 231 User s Manual 106 739 Input Terminal Mating Connector 2007 12 Wall Plug in Power Supply 120
20. e sensor may differ the temperature between the active sensing element and the sample to which the sensor mounts This reflects as a real temperature offset between what is measured and the true sample temperature Eliminate such temperature errors with proper selection and installation of connecting leads To minimize heat flow through the leads select leads of small diameter and low thermal conductivity Phosphor bronze or Manganin wire is commonly used in sizes 32 or 36 AWG These wires have a fairly low thermal conductivity yet electrical resistance is not large enough to create measurement problems Thermally anchor lead wires at several temperatures between room temperature and cryogenic temperatures to guarantee no heat conduction through the leads to the sensor 2 3 3 Sensor Mounting Before installing a diode sensor identify DT 470 SD which lead is the anode and which is Diode Sensor Leads the cathode When viewed with the base down and the leads towards the observer the anode is on the right and the cathode is on the left The Lake Shore DT 470 SD silicon diode sensor Cathode 7 Te Anode lead configuration is shown to the right For other sensors read accompanying literature or consult the manufacturer to positively identify sensor leads Lead identification should remain clear even after sensor installation Record the sensor serial number and location On the DT 470 SD the base is the largest flat surface
21. erature sensor based on the forward voltage drop at constant current through a pn semiconductor junction formed in crystalline silicon stability The ability of an instrument or sensor to maintain a constant output given a constant input temperature scales See Kelvin Scale Celsius Scale and ITS 90 Proper metric usage requires that only kelvin and degrees Celsius be used However since degrees Fahrenheit is in such common use all three scales are delineated as follows Boiling pointof water 373 15 K 100 C 212 F Triple point ofwater 273 16 K Freezing pointof water 273 15 K 0 C 32 F Absolute zero OK 273 15 C 45967 F kelvin Celsius Fahrenheit To convert kelvin to Celsius subtract 273 15 To convert Celsius to Fahrenheit multiply C by 1 8 then add 32 or F 1 8 x C 32 To convert Fahrenheit to Celsius subtract 32 from F then divide by 1 8 or C F 32 1 8 tolerance The range between allowable maximum and minimum values two lead Measurement technique where one pair of leads is used for both excitation and measurement of a sensor This method will not reduce the effect of lead resistance on the measurement References 1 Sybil P Parker Editor Dictionary of Scientific and Technical Terms Third Edition New York McGraw Hill 1969 IBSN 0 395 20360 0 2 Christopher J Booth Editor The New IEEE Standard Dictionary of Electrical and Electronic Terms IEEE Std 100 1992 Fifth Edition New York
22. goods If damage or loss is apparent please notify the shipping agent immediately Open the shipping containers Use the packing list included with the system to verify receipt of the instrument sensor accessories and manual Inspect for damage Inventory all components supplied before discarding any shipping materials If there is freight damage to the instrument file proper claims promptly with the carrier and insurance company and notify Lake Shore Notify Lake Shore immediately of any missing parts Lake Shore cannot be responsible for any missing parts unless notified within 60 days of shipment Refer to the standard Lake Shore Warranty on the A Page immediately behind the title page 2 2 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 Instruments may not be accepted without a RGA number When returning an instrument for service Lake Shore must have the following information before attempting any repair Instrument model and serial number User name company address and phone number Malfunction symptoms Description of system Returned Goods Authorization RGA number OV RIO NO Repack the system in its original container if available Affix shipping labels and FRAGILE warnings Write RGA number
23. icated from pure platinum to make the Lake Shore PT family of resistance temperature sensor elements prefixes SI prefixes used throughout this manual are as follows Factor Prefix Symbol Factor Prefix Symbol 10 yotta Y 10 deci d 10 zetta Z 10 centi G 10 8 exa E 10 milli m 10 peta P 10 micro u 10 tera T 10 nano n 10 giga G 1072 pico p 106 mega M 105 femto f 10 kilo k 10 atto a 10 hecto h 10 zepto z 10 deka da 107 yocto y Glossary B 3 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 repeatability The closeness of agreement among repeated measurements of the same variable under the same conditions self heating Heating of a device due to dissipation of power resulting from the excitation applied to the device The output signal from a sensor increases with excitation level but so does the self heating and the associated temperature measurement error sensitivity The ratio of the response or change induced in the output to a stimulus or change in the input Temperature sensitivity of a resistance temperature detector is expressed as S dR dT setpoint The value selected to be maintained by an automatic controller SI Syst me International d Unit s See International System of Units silicon diode Temp
24. lass Nonflammable Gas DOT Name Helium Refrigerated Liquid DOT ID No UN 1963 liquid nitrogen LN2 Also used for low temperature and superconductivity research and for its refrigeration properties such as in freezing tissue cultures minimum purity 99 998 O2 8 ppm max Boiling point at 1 atm 77 4 K Latent heat of vaporization 160 kilojoules per liter Liquid density 0 81 kilograms per liter EPA Hazard Categories Immediate Acute Health and Sudden Release of Pressure Hazards DOT Label Nonflammable Gas DOT Class Nonflammable Gas DOT Name Nitrogen Refrigerated Liquid DOT ID No UN 1977 material safety data sheet MSDS OSHA Form 20 contains descriptive information on hazardous chemicals under the OSHA Hazard Communication Standard HCS These data sheets also provide precautionary information on the safe handling of the gas as well as emergency and first aid procedures MKSA System of Units A system in which the basic units are the meter kilogram and second and the ampere is a derived unit defined by assigning the magnitude 4r x 107 to the rationalized magnetic constant sometimes called the permeability of space NBS National Bureau of Standards Now referred to as NIST National Institute of Standards and Technology NIST Government agency located in Gaithersburg Maryland and Boulder Colorado that defines measurement standards in the United States platinum Pt A common temperature sensing material fabr
25. mensions 008 1 6 1 3 Multiple Unit Case Physical Dimensions c seeeeeeee 1 8 2 1 Typical Wall Plug In Power Supply cceccceesteeeseeeeeeeeenees 2 7 3 1 Model 231 DIP Switch S1 ceceeceseeeeeeeeeeeneeseeeeteneeeeneeeas 3 1 4 1 Front Panel Connectors J2 amp J3 Details 0 0 eeeeeeeeee 4 2 4 2 VMEbus Connector J1 Details 000 0 eeeeeeeeeeeeeeeeeneeeeneetenees 4 3 4 3 Model 231 PCB Layout sisati inea aea e atata 4 4 LIST OF TABLES Table No Title Page 1 1 Model 231 Input Specifications ec eeeeeeeeeeeeeeeeeeeeneetees 1 3 1 2 Model 231P Input Specifications c cc eeceeeeeeeeeeeeeeeeeeetees 1 4 1 3 Model 231 amp 231P Output Specifications eee 1 5 1 4 Model 2308 12 VMEbus Rackmount Case Specs 6 1 7 2 1 Effect of Current Variation on Diode Temperature 2 5 2 2 Typical DT 470 dV dl Values for Selected Temps 2 5 3 1 Conversion Parameters for Temperature in K ceeeee 3 2 A 1 Lake Shore Standard Diode Curves c ccccceeseeeteeesetees A 1 A 2 Series PT 100 Platinum Resistance Curve ccceseeee A 2 ii Table of Contents Lake Shore Model 231 User s Manual CHAPTER 1 INTRODUCTION 1 0 GENERAL Lake Shore Cryotronics designed and manufactures the Model 231 in the United States of America In general reference to the Model 231 means both the Model 231 and 231P Specific references are made where
26. n incremental value in the temperature scale i e there are 100 degrees between the ice point and the boiling point of water in the Celsius scale and 180 degrees between the same two points in the Fahrenheit scale Glossary B 1 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 electrostatic discharge ESD A transfer of electrostatic charge between bodies at different electrostatic potentials caused by direct contact or induced by an electrostatic field error Any discrepancy between a computed observed or measured quantity and the true specified or theoretically correct value or condition excitation Either an AC or DC input to a sensor used to produce an output signal Common excitations include constant current constant voltage or constant power Fahrenheit F Scale A temperature scale that registers the freezing point of water as 32 F and the boiling point as 212 F under normal atmospheric pressure See Temperature for conversions four lead measurement technique where one pair of excitation leads and an independent pair of measurement leads are used to measure a sensor This method reduces the effect of lead resistance on the measurement GaAlAs Gallium aluminum arsenide semiconducting materi
27. n with a standard the correct accurate value of each scale reading on a meter or other device or the correct value for each setting of a control knob cathode The terminal from which forward current flows to the external circuit Anode gt Cathode Celsius C Scale A temperature scale that registers the freezing point of water as 0 C and the boiling point as 100 C under normal atmospheric pressure Celsius degrees are purely derived units calculated from the Kelvin Thermodynamic Scale Formerly known as centigrade See Temperature for conversions cgs system of units A system in which the basic units are the centimeter gram and second cryogen See cryogenic fluid cryogenic Refers to the field of low temperatures usually 130 F or below as defined by 173 300 f of Title 49 of the Code of Federal Regulations cryogenic fluid A liquid that boils at temperatures of less than about 110 K at atmospheric pressure such as hydrogen helium nitrogen oxygen air or methane Also known as cryogen cryostat An apparatus used to provide low temperature environments in which operations may be carried out under controlled conditions curve A set of data that defines the temperature response of a temperature sensor It is used to convert the sensor signal to temperature Curve 10 The voltage versus temperature characteristic followed by all DT 400 Series Silicon Diode Temperature Sensors degree A
28. nnectors J2 and J3 Details 4 2 Service Lake Shore Model 231 User s Manual J1 VMEbus Connector End View eoocooo0oo0o000000000000000000800000000 CC ooooo0oo0oo00000000000000000000000000 0 B eoocooo0o0o000000000000000000000000004 32 31 30 29 28 27 26 25 24 23 22 21 2019 18 17 16 15 14 13 1211109 8 7 6543 21 Pin Used O Pin Not Used Entire Row B is not present Not Used Not Used GND Entire Row GND Not Used Not Present Not Used GND Not Used Not Used Not Used GND Not Used Not Used Not Used GND Not Used Not Used Not Used GND Not Used Not Used Not Used 5 VDC 5 VDC Figure 4 2 VMEbus Connector J1 Details 4 3 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 1 A digital voltmeter DVM that measures DC voltage between 0 and 10 V accurately to 0 0001 V 2 A regulated 5 V DC power supply with tolerance within 0 25 V capable to source 500 mA on an S 760 or S 765 Switchcraft or equivalent power plug 0 218 inch outside diameter accepts 0 08 inch diameter pin 5 V is on sleeve with center pin return 3 Mating screw terminal to Model 231 front panel signal connector 4 A500 Q 0 02 or better precision resistor 5 Three jumper
29. on of the DT 470 for applications where temperature measurements below 10 K are not required Lake Shore s newest silicon diode temperature sensor Interchangeable repeatable accurate wide range customized for cryogenics A wide range Gallium Aluminum Arsenide GaAlAs Diode Sensor well suited for temperature measurement in low to moderate magnetic fields Platinum Resistance Thermometer is an excellent choice for cryogenic temperature sensing and control in the range from 30 K to 873 K 243 C to 600 C Options amp Accessories Lake Shore Model 231 User s Manual This Page Intentionally Left Blank 5 4 Options amp Accessories Lake Shore Model 231 User s Manual APPENDIX A MODEL 231 CURVE TABLES Table A 1 Lake Shore Standard Diode Curves Break point No ONoOahRWD DT 670 Curve Temp K Temp K 0 00000 0 14703 0 21870 0 32600 0 49026 0 59422 0 67357 0 75123 0 81604 0 86861 0 90948 0 94910 0 98709 1 01423 1 04026 1 06998 1 09543 1 10612 1 11272 1 11566 1 11945 1 12592 1 14082 1 18219 1 27532 1 33400 1 41020 1 59237 1 63785 1 64411 6 55360 0 00000 0 09032 0 12536 0 18696 0 29958 0 42238 0 56707 0 68580 0 76717 0 83541 0 89082 0 94455 0 98574 1 02044 1 05277 1 08105 1 09477 1 10465 1 11202 1 11517 1 11896 1 12463 1 13598 1 21555 1 29340 1 36687 1 44850 1 64112 1 68912 1 69808 6 55360 Curve Tables A 1 Lake Shore Model
30. on the outside of the container or on the packing slip If not available consult Lake Shore for shipping and packing instructions Installation 2 1 Lake Shore Model 231 User s Manual 2 3 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 Do not ground the sensor 2 Shield leads and connect shield wire to SHIELD on screw terminal connector only Do not connect shield at other end of cable 3 Keep leads as short as possible 4 Use twisted pair wire Use Lake Shore Duo Twist wire or equivalent for two wire or Quad Twist wire or equivalent for four wire applications 5 Thermally anchor lead wires 2 3 1 Two Lead versus Four Lead Measurements In two lead measurement the leads that measure sensor voltage also carry the current The voltage measured at the instrument is the sum of the temperature sensor voltage and the IR voltage drop within the two current leads Since heat flow down the leads can be critical in a cryogenic environment wire of small diameter and significant resistance per foot is preferred to minimize this heat flow Consequently a voltage drop within the leads may exist Four lead measurement confines current to one pair of leads and measures sensor voltage with the other
31. pply CAUTION The Model 2308 12 bus is designed only to power multiple Model 231s Do not use with standard VME cards Table 1 4 Model 2308 12 VMEbus Rackmount Case Specifications No of Card Slots 12 Size 45 x 17 8 x 26 centimeters 17 7 x 7 x 10 25 inches Weight 5 5 kilograms 12 pounds Output Voltage 5 VDC 100 mV Peak to Peak Ripple Output Current 6 Amperes Maximum Input Power Universal 85 265 VAC 47 440 Hz 60 Watts Ambient Temp Range 15 35 C 59 95 F Introduction 1 7 Lake Shore Model 231 User s Manual TOP VIEW lt ____________17 625 inches 44 8 om ________ gt O00000000000000000000000000000000000000000000000000 O000000000000000000000000000000000000000000000000000 FRONT VIEW inches 26 M E 7 0 inches 17 8 cm SIDE Y VIEW Figure 1 3 Typical Multiple Unit Case Physical Dimensions 1 8 Introduction Lake Shore Model 231 User s Manual CHAPTER 2 INSTALLATION 2 0 GENERAL This chapter covers inspection and unpacking in Paragraph 2 1 repackaging for shipment in Paragraph 2 2 sensor installation recommendations in Paragraph 2 3 sensor curve definitions in Paragraph 2 4 and power connections in Paragraph 2 5 2 1 INSPECTION AND UNPACKING Inspect shipping containers for external damage Make all claims for damage apparent or concealed or partial loss of shipment in writing to Lake Shore within 5 days from receipt of
32. r incidental or consequential damages so the above limitation may not apply to you 12 This limited warranty gives you specific legal rights and you may also have other rights that vary within or between jurisdictions where the product is purchased and or used Some jurisdictions do not allow limitation in certain warranties and so the above limitations or exclusions of some warranties stated above may not apply to you Except to the extent allowed by applicable law the terms of this limited warranty statement do not exclude restrict or modify the mandatory statutory rights applicable to the sale of the product to you CERTIFICATION Lake Shore certifies that this product has been inspected and tested in accordance with its published specifications and that this product met its published specifications at the time of shipment The accuracy and calibration of this product at the time of shipment are traceable to the United States National Institute of Standards and Technology NIST formerly known as the National Bureau of Standards NBS or to a recognized natural standard TRADEMARK ACKNOWLEDGEMENT Manufacturers and sellers claim many designations as trademarks to distinguish their products Where those designations appear in this manual and Lake Shore was aware of a trademark claim the designations appear in initial capital letters with a or symbol Apiezon is a trademark of Biddle Instruments CalCurve Carbon Glass Cernox
33. sequential damages in connection with furnishing performance or use of this material Rev 1 8 P N 119 021 03 October 2013 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 If Lake Shore receives notice of any such defects during the Warranty Period and the defective Product is shipped freight prepaid back to Lake Shore Lake Shore will at its option either repair or replace the Product if it is so defective without charge for parts service labor or associated customary return shipping cost to the Purchaser Replacement for the Product may be by either new or equivalent in performance to new Replacement or repaired parts or a replaced Product will be warranted for only the unexpired portion of the original warranty or 90 days whichever is greater Lake Shore warrants the Product only if the Product has been sold by an authorized Lake Shore employee sales representative dealer or an authorized Lake Shore original equipment manufacturer OEM The Product may contain remanufactured parts equivalent to new in performance or may have been subject to incidental use when it is originally sold to the Purchaser The Warranty Period begins on
34. ser s Manual 2 Measure AC voltage across the diode with an AC voltmeter or oscilloscope Most voltmeters do not have the frequency response to measure noise associated with digital circuits or interfaces which operate in the MHz range For a thorough discussion of this potential problem and the magnitude of error which may result request the paper Measurement System Induced Errors In Diode Thermometry J K Krause and B C Dodrill Rev Sci Instr 57 4 661 April 1986 from Lake Shore To greatly reduce potential AC noise connect twisted leads pairs between the measurement instruments and the diode sensors Use 32 or 36 AWG Lake Shore Duo Twist Cryogenic Wire which features phosphor bronze wire twisted at 3 15 twists per centimeter 8 twists per inch Refer to the Lake Shore Product Catalog or contact Lake Shore for further information 2 4 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 Curve 10 Lake Shore DT 470 Series silicon diodes follow the same standard temperature response Curve 10 which makes them interchangeable Lake Shore programs Curve 10 into its Temperature Controllers Digital Thermometers and Temperature Transmitters DT 470 Series silicon diode sensors come in five bands of tracking accuracy allo
35. slates it into temperature Either the standard temperature curve or an optional CalCurve relates voltage to temperature the Series TG 120 requires a CalCurve The Model 231P uses a Series PT 100 Platinum Thermometer The Model 231P excites the sensor with a 500 A current to produce a measurable signal Either the standard platinum curve DIN 437600 or a CalCurve is used for temperature conversion Introduction 1 1 Lake Shore Model 231 User s Manual Once the Model 231 obtains temperature data it 2 transmits it as a current from 4 to 20 mA The current output changes linearly with sensor temperature Output scale depends on the selected temperature range Several switch selected ranges O 231 are available For highest accuracy and sensitivity set the output for a narrow temperature band An Temperature optional 0 to 20 mA output is also available to Transmitter convert output to a voltage reading scaled from zero A 500 Q 0 02 precision resistor is provided for this purpose This resistor produces the maximum full scale output of 10 V OUT SHIELD A single 5 VDC supply powers Model 231 circuitry The outputs are isolated so several 231s can operate from the same supply without interference The 5 VDC can also be supplied from the pins on the VME bus connector SENS I SENS V SHIELD SENS V mE SENS I Mechanical mounting is easy because the Model 231 is built on a
36. 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 o EAL akeShore Figure 1 1 Typical Model 231 Front Panel 1 2 Introduction 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 A 0 1 DC current Update Rate 5 readings per second CalCurve Storage 1 curve loaded in PROM at factory Example Lake Shore Sensor DT 470 CO Temperature Range 1 4 K 325 K with DT 470 Standard Curve Curve 10 Typical Sensor Sensitivity 30 mV K at 4 2 K 1 9 mV K at 77 35 K 2 4 mV K at 300 K Measurement Resolution Sensor Units 76 3 uV Temp Equivalence 2 5 mK at 4 2 K 40 mK at 77 35 K 32 mK at 300 K Measurement Accuracy Sensor Units 75 uV 0 01 of reading Temp Accuracy 0 07 K at 4 2 K 0 16 K at 77 35 K 0 12 K at 300 K DT 470 CO with 8001 CalCurve Measurement Temperature Coefficient Sensor Units 0 0006 of voltage reading per C Temp Equivalence 3 mK at 4 2 K 3 mK C at 77 35 K 1 2 mK C at 300 K Typical Performance With Series TG 120 Sensor Similar to selected example diode sensor with improved mea
37. surement resolution and temperature resolution at temperatures of 4 K to 50 K Sensor voltage must not exceed 5 V at lowest operating temperature Introduction 1 3 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 Q Input Range 0 312 Q Sensor Excitation 500 uA 0 02 DC current Update Rate 5 readings per second CalCurve Storage 1 curve loaded in PROM at factory Example Lake Shore Sensor PT 103 Temperature Range 14 K 873 K with PT 103 Standard Curve DIN 43760 Typical Sensor Sensitivity 0 19 Q K 30 K 0 42 Q K 77 35 K 0 39 Q K 300 K 0 34 Q K typical up to 800 K Measurement Resolution Sensor Units 4 8 mQ Temp Equivalence 22 mK at 30 K 11 mK at 77 35 K 13 mK at 300 K 14 mK typical up to 800 K Measurement Accuracy Sensor Units Ohms Q Temp Accuracy 0 2 K at 30 K 0 15 K at 77 35 K 0 3 K at 300 K 0 7 K typical up to 800 K Measurement Temperature Coefficient Sensor Units 0 002 of voltage reading per C Temp Equivalence 0 4 mK C at 30 K 1 mK at 77 35 K 6 mK C at 300 K 18 mK C at 800 K Magnetic Field Use Up to 19 teslas for T gt 30 K Introduction Lake Shore Model 231 User s Manual Table 1 3 Model 231 and 231P Output Specifications Output Number of Outputs One O
38. ted 4 1 3 Output Is Incorrect Value Small Error Can be caused by incorrect curve selection for the sensor type See Figure 3 1 Another cause for a small error is the output resistor for output current to voltage conversion is not high precision When using voltage out the output resistor must be 0 02 accurate or better and have low drift Service 4 1 Lake Shore Model 231 User s Manual 4 1 4 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 If voltage is higher than 5 VDC then sensor connections may be open If sensor voltage polarity is negative SENS V and SENS V leads are reversed With the sensor at operating temperature the voltage readings should correspond to Curve 10 for diode sensors or DIN 43760 for platinum sensors as detailed in Appendix A 4 2 MODEL 231 CONNECTORS There are three connectors on the Model 231 The two front panel connectors are the 8 pin terminal block J3 and the power connector J2 See Figure 4 1 The rear connector J1 is for connecting to the VMEbus See Figure 4 2 OUT OUT SHIELD SENS I SENS V SHIELD SENS V SENS I Figure 4 1 Front Panel Co
39. the date of Purchaser s physical receipt of the Product or later on the date of operational training and verification OT amp V of the Product if the service is performed by Lake Shore provided that if the Purchaser schedules or delays the Lake Shore OT amp V for more than 30 days after delivery then the Warranty Period begins on the 31st day after Purchaser s physical receipt of the Product This limited warranty does not apply to defects in the Product resulting from a improper or inadequate installation unless OT amp V services are performed by Lake Shore maintenance repair or calibration b fuses software power surges lightning and non rechargeable batteries c software interfacing parts or other supplies not furnished by Lake Shore d unauthorized modification or misuse e operation outside of the published specifications f improper site preparation or site maintenance g natural disasters such as flood fire wind or earthquake or h damage during shipment other than original shipment to you if shipped through a Lake Shore carrier This limited warranty does not cover a regularly scheduled or ordinary and expected recalibrations of the Product b accessories to the Product such as probe tips and cables holders wire grease varnish feed throughs etc c consumables used in conjunction with the Product such as probe tips and cables probe holders sample tails rods and holders ceramic putty for mo
40. unting samples Hall sample cards Hall sample enclosures etc or d non Lake Shore branded Products that are integrated with the Product To the extent allowed by applicable law this limited warranty is the only warranty applicable to the Product and replaces all other warranties or conditions express or implied including but not limited to the implied warranties or conditions of merchantability and fitness for a particular purpose Specifically except as provided herein Lake Shore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products Any implied warranty is limited in duration to the warranty period No oral or written information or advice given by the Company its Agents or Employees shall create a warranty or in any way increase the scope of this limited warranty Some countries states or provinces do not allow limitations on an implied warranty so the above limitation or exclusion might not apply to you This warranty gives you specific legal rights and you might also have other rights that vary from country to country state to state or province to province Further with regard to the United Nations Convention for International Sale of Goods CISC if CISG is found to apply in relation to this agreement which is specifically disclaimed by Lake Shore then this limited warranty excludes warranties that a the Product is fit for the purpose for whi
41. ure Case DeSCription cecceeceeeeeeees 1 6 1 3 Multiple Unit Enclosure Case Description 1 7 2 INSTALLATION Qivcsesssivisiiccscvssctvascnser coceseussecncesdecasieeaccneasesscrasersess 2 1 2 0 General 2 esis cseesieliv cee E os eee cee 2 1 2 1 Inspection and Unpacking cceeeeseesesseeeeeeneeereeees 2 1 2 2 Repackaging For Shipment eeccesceeseeteseeeeeeeeeaes 2 1 2 3 Sensor Installation Recommendations ceeeeee 2 2 2 3 1 Two Lead vs Four Lead Measurements 005 2 2 2 3 1 1 Two Lead Measurement cceeeeeeeeeeeteeeees 2 2 2 3 1 2 Four Lead Measurement cccccccsceeeeeeeeeeeee 2 3 2 3 2 Connecting Leads To The Sensol sccceeeeeees 2 3 2 3 3 Sensor Mounting cceeeeceeeeeeseeeeeeeeeteneeeeeeseeeeeeeeea 2 3 2 3 4 Measurement Errors Due To AC Noise 00 2 4 2 4 Sensor Curve Definition cccccsceeeeeseeeesssneeeeeeeeees 2 5 2 5 Power Connections ccccscscceesseeeeeseneeeeseeeeeeseseeeeeees 2 6 3 OPERATION a e a a a ra a aea aeaa a Kroa 3 1 3 0 General AE EE E S A E ease aee Pte 3 1 3 1 PCB DIP Switch Settings eceeeeeeeeseeeeeeeeneeeeeeeeeaes 3 1 3 2 Output to Temperature Conversion cceeseeeeees 3 2 4 SERVICE we scvvecssssicsscscccvisscsvevstecnscnneesvsnsctecvsnseesasveresscnnenredstaverness 4 1 4 0 Generali ienai iea eed codes Sie os 4 1 4 1 General Troubleshooting ccccese
42. utput 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 Q 0 02 25 ppm resistor Output Compliance 10 V 500 Q max load Output Temperature Ranges 0 20 K 0 100 K 0 200 K 0 325 K 0 475 K and 0 1000 K 4 20 mA Output Output Resolution Current 1 22 uA 0 006 of full scale Temp Equivalence 0 20 K 1 5 mK 0 325 K 24 8 mK 0 100 K 7 6 mK 0 475 K 36 2 mK 0 200 K 15 3mK 0 1000 K 76 3 mK Output Accuracy Current 2 uA 0 01 of full scale Temp Equivalence 0 20 K 2 5 mK 0 325 K 41 mK 0 100 K 12 5mK 0 475K 59 mK 0 200 K 25 mK 0 1000 K 125 mK Output Temperature Coefficient Current output C ambient 0 0055 C Temp Equivalence 0 20 K 1 mK C 0 325 K 18 mK C 0 100 K 6 mK C 0 475 K 26 mK C 0 200 K 12 mK C 0 1000 K 55 mK C 0 20 mA Output 0 10 V w 500 0 02 Load Resistor Output Resolution Voltage 0 6 mV 0 006 of full scale Temp Equivalence 0 20 K 1 2 mK 0 325 K 19 8 mK 0 100 K 6 1 mK 0 475 K 29 mK 0 200 K 12 2mK 0 1000 K 61 mK Output Accuracy Voltage 3 mV 0 03 of full scale Temp Equivalence 0 20 K 6 mK 0 325 K 98 mK 0 100 K 30 mK 0 475 K 143 mK 0 200 K 60 mK 0 1000 K 300 mK Output Temperature Coefficient Voltage Output C ambient 0 008 C Temp Equivalence 0 20 K 2 mK C 0 325 K 26 mK C 0 100 K 8 mK 0 475 K 38 mK
43. wing selection based on both performance and expense Standard Curve 10 1 8 Pry Average _ Slope 26 mV K 1 6 1 4 12 1 0 0 8 0 6 Average Slope 0 2 2 3 mV K 0 4 Forward Voltage V volts 0 20 60 200 300 Temperature K kelvin Installation 2 5 Lake Shore Model 231 User s Manual DT 670 DT 670 Series Silicon Diode Sensors come in five bands of tracking accuracy allowing selection based on both performance and price Platinum Curve Users of the Model 231P have the option of the standard platinum curve or the CalCurve The standard platinum curve detailed in Appendix B conforms to DIN 43760 1980 IEC 751 1983 and 1904 1984 CalCurve CalCurve is the easiest way to combine the additional performance of a Lake Shore calibrated sensor with the Model 231 The CalCurve is a read only memory chip PROM with specific sensor calibration stored on it The CalCurve improves combined sensor instrument accuracy to within 0 25K or better over the calibrated temperature range of the sensor The 8001 231 CalCurve is factory installed upon order of an instrument with a calibrated sensor To order an instrument to be used with a currently owned Lake Shore calibrated sensor Lake Shore requires the sensor model number and serial number at the time of order The Model
44. y be different from the points at which calibration data was taken IPTS 68 International Practical Temperature Scale of 1968 Also abbreviated as Tes isolated neutral system A system that has no intentional connection to ground except through indicating measuring or protective devices of very high impedance ITS 90 International Temperature Scale of 1990 Also abbreviated as Too This scale was designed to bring into as close a coincidence with thermodynamic temperatures as the best estimates in 1989 allowed Kelvin K The unit of temperature on the Kelvin Scale It is one of the base units of SI The word degree and its symbol are omitted from this unit See Temperature Scale for conversions B 2 Glossary 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 liquid helium LHe Used for low temperature and superconductivity research minimum purity 99 998 Boiling point at 1 atm 4 2 K Latent heat of vaporization 2 6 kilojoules per liter Liquid density 0 125 kilograms per liter EPA Hazard Categories Immediate Acute Health and Sudden Release of Pressure Hazards DOT Label Nonflammable Gas DOT C
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