Model 818/819 - Lake Shore Cryotronics, Inc.
Contents
1. 34 orem so 03210 35 wem ores sso 0 30056 3 ores soo 022 m zo om 1 1 Appendix A Curve Information A 1 Lake Shore Model 818 819 Cryopump Monitor User s Manual Table A 2 Curve 1 DT 500DI 8A Voltage Temperature Characteristics 5 s iie 760 42 24mm 36 44 awe 315 02 068469 46 24mm 00 48 se ios 1950 0616 3s so sw 2 tome 200 06185 5s to 062754 eo oer 200 5s 1093 250 05 zm sso 200 058502 7s 22 ova 250 0 57000 eo 2une so 10um 20 0515 as mo oues s x oo 750 os 200 0 52089 ss 74 oo ema so oss 250 05002 ez osse 2550 048065 320 1er so esr o sso oss 046202 35 1e 1000 ose 200 04925 ose 250 049659 350 iem oso2. oss 3 2850 35 oser 200 039975 39e so 0858 2950 ossi 15x 3 oss 0 0515 14x oss 2 3050 036078 z 220 13 033509 iz ore oszu 1zmz 93005 z 250 11s i550 ores 029159 25 ors 1 00 027665 zo _ 1950 oms J zo 7 700 oreo 1 A 2 Appendix A Curve Information Lake Shore Model 818 819 Cryopump Monitor User s Manual Table A 3 Curve 2 DT 500DRC D Voltage Temperature Characteristics zs 20 1955 100 070757 ss 25 20 13 3s 25 20 mo 100 087931 2s e 1950 oes 4s so zz 2000 065105 49 260 tue 2050 053693 20 258 20 tme 200 082280 loess zo 250 05067 24 20 tne 2200 2s 2s soo 108 z250 058080 2s 2s 100 2800 055707 15 10 2350 05334 2s sso 105 7 200 0590 34 55 seo 10 052649 24s 4o 108 2500 051337 3s 4
3. 022463 _____ __ 0765 020212 se sse 250 0798 00 ss zo 07388 3 460 se sro orrs es 200 orowe re se 10885 01485 zs 4e 7 zo 06880 460 073760 so iue 2o 1035 06787 2 0 012556 ss iam zo oses 450 071356 25 eo 065 400 forr es iue o 3 460 00092 oo oo Appendix A Curve Information 7 8 Lake Shore Model 818 819 Cryopump Monitor User s Manual This Page Intentionally Left Blank Appendix A Curve Information Lake Shore Model 818 819 Cryopump Monitor User s Manual APPENDIX B MODEL 818 819 MOUNTING ADAPTER To mount the Model 818 819 in a 4 panel EIA rack space use the optional Model 818 819 Mounting Adapter shown in Figure B 1 5 220 4 970 4 760 Enclosure Outline Front Panel Outline 0 460 0 250 0 000 N eo e i q o Figure B 1 Model 818 819 Mounting Detail Appendix B 818 819 Mounting Adapter B 1 2 Lake Shore Model 818 819 Cryo
4. 26 0 sm 1600 07806 3s 2e 00 14 150 ese zt 4 1600 orem 38 2e 20 iw 1650 orm 2e me 7 or z 20 2e45 ms orme _____ 2 26 250 er 1800 0 7060 24 26 15 1850 05918 2s loos zo 100 2s ew z t2 190 oseas 30 25 20 200 os p32 t0 2050 05351 su so te 200 se 10 250 ose 3s 550 sso 6 200 oso z 4o 25 se wwe osre a losa 400 200 05651 44 2s 4e 1 2850 054 4s 24m 500 es 200 oss 4s 24m 550 109 0526 so 4x 1 600 tcm 2500 051158 ss 24x 10 2550 049 so 3 mo ros 2600 045 s mo os a 2650 042 se ose 200 04588 ez 250 04454 so 2 ss 2800 042 pes 224 wo osse 3 oms eo oma so ose 200 945 pes o 9 oss 250 0 3904 f oo oem 300 0563 e 29 moo ose 2 0352 o
5. 22 ws v4 12 soo 01802 iem 10155 050689 24 m 165 1 10058 so 2s o 04827 2e 2 oso oss soo 0470 097580 sso 045858 2s ise 175 2 ose soo 04468 2s 1298 woo osser 360 04355 se 42409 n mso 09485 5 300 04258 s 1o woo 09388 0 az vsu iso ss ies 12155 __ wo 3550 03666 ie __ 027297 ss pees 5 f osem ss iems oswe soo ar ieme z wo f oser 035950 z iem 2 zes osser ss iemer 20 woo 0845 360 e 4 300 2 mee woo 3950 02870 ___ wso 027456 e iemo woo s eme w 17045 ores 024963 se __ woo oz s2
6. 40 1e 2550 050026 4o 4 500 1o 2600 4r sso tor 6 2950 047403 44 4 so tes 200 046057 4s 24 s 106 250 oar 4s 240 mo 10 2800 043365 so s 0902 5 2850 042019 ss sew 00 ooreo 2900 00613 so se sso 0950 2950 039208 zw so oss 300 037802 7o ez sso 4 3050 03207 2m 100 900 oaaao so 2n 1050 950 0382 ss 21 moo ose 320 325 eo 21 mso 086 3250 030568 pes 2o 100 052 30 o 150 086 3950 027658 e o 1 00 oseo 026197 19 f 1850 082 3 024739 z 19x ost 300 023325 e 18m osana 350 1500 3600 020497 16 1550 2 3650 0 1008 zs wo 1600 500 Ot 154 1650 350 01646 14 o woo orse 1 390 015168 34m mso Appendix A Curve Information A 3 Lake Shore Model 818 819 Cryopump Monitor User s Manual Table A 4 Curve 3 DT 500DRC E1 Voltage Temperature Characteristics zem 39 1657 450 osos
7. USER S MANUAL Model 818 819 Cryopump Monitor Curve 0 DT 500DI 8B Curve 1 DT 500DI 8A Curve 2 DT 500DRC D Curve 3 DT 500DRC E1 Curve 4 CTI Curve C Curve 5 DT 500DI 8C Curve 6 DT 470 Curve 10 Curve 7 User Selectable Curve Curve 8 User Selectable Curve Curve 9 User Selectable Curve akeShore Lake Shore Cryotronics Inc 575 McCorkle Blvd 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 consequential damages in connection with furnishing performance or use of this material Rev 1 2 P N 119 003 13 April 1999 Lake Shore Model 818 819 Cryopump Monitor User s Manual LIMITED WARRANTY Lake Shore Cryotronics Inc henceforth Lake Shore the man
8. mso oss 900 osr 25 199 100 osre 050 so oss 300 03194 15e 18x 100 05 3250 03038 1e re e osn 31 soo ozs owe are ____ _ e A 4 Appendix A Curve Information Lake Shore Model 818 819 Cryopump Monitor User s Manual Table A 5 Curve 4 CTI Diode Voltage Temperature Characteristics 14 550 1900 2 nmo 135 eoo 1950 0508 27 mo 1 50 osse 2000 0620 1 oo 092 2050 08133 wo 250 os 200 oses wm na 096 250 0588 t wo oso 200 050 o so omo 2250 05583 zs t5 os 290 055 x tu 950 ost 2950 0599 t 100 oss 200 ost wo oso 250 0502 oz moo osse 7 2500 0486 tw 085 2550 0457 t5 osso 2600 04620 250 t 150 osse 2650 ose so tw oo oss 200 osa 450 ose ______2750 0497 te o moo or 5 2800 04050 ores 4 2850 ose s 1o ores z oss ts 150 ores 2950 0360 ww 1o ore 3000 o
9. 818 lt Reading gt lt Units gt Model 819 lt Channel 1 Reading Units Channel 2 Reading gt lt Units gt t lt Channel 3 Reading gt lt Units gt t lt Channel 4 Reading gt lt Units gt Units Kelvin K Celsius C Fahrenheit F or Volts V Query Sensor Reading and Alarm Status WS Model 818 lt Reading gt lt Units gt lt High Alarm Status gt lt Low Alarm Status gt Model 819 lt Channel 1 Reading gt lt Units gt lt Channel 1 High Alarm Status gt lt Channel 1 Low Alarm Status gt lt Channel 2 Reading gt lt Units gt lt Channel 2 High Alarm Status Channel 2 Low Alarm Status gt lt Channel Reading gt lt Units gt lt Channel 3 High Alarm Status gt lt Channel 3 Low Alarm Status gt lt Channel 4 Reading gt lt Units gt lt Channel 4 High Alarm Status gt lt Channel 4 Low Alarm Status gt Units K Kelvin C Celsius F Fahrenheit or V Volts Alarm Status A Active or I Inactive Query Scan Data WY Model 818 N indicating no scanner Model 819 lt Scan Status gt lt Current Channel gt lt Channel 1 Dwell Time Index gt lt Channel 2 Dwell Time Index gt lt Channel 3 Dwell Time Index gt lt Channel 4 Dwell Time Index gt Scan Status H Holding or S Scanning Channel 0 to 4 Dwell Time Index 0 0 seconds skip 1 5 seconds 2 10 seconds 3 30 seconds 4 60 seconds Remote Operation Lake Shore Model 818 819 Cryopump Monitor User s Manual 4 2 3 Model
10. s go out indicating alarms are reopened From the Rear Panel disable the MARK LATCH switch Configuration DIP Switch 2 momentarily Send the R RESET command over the RS232C interface Operation 3 3 Lake Shore Model 818 819 Cryopump Monitor User s Manual 3 5 4 Setting the and LO Alarms The alarms may be changed if the rear panel ALARM SET switch Configuration DIP Switch 3 is ON 1 To change the alarms from the front panel 1 Turn ON 1 rear panel configuration DIP Switch 3 marked ALARM SET 2 Press either the HI ALARM or LO ALARM key and check the displayed alarm setting To change the setting push either the or V key until the desired setting is reached Note the alarms only be set in temperature If voltage is the display units the display defaults to kelvin if an alarm key is pushed The alarm setpoint resolution is 0 1 C or F The alarm setpoint is bounded by the sensor temperature range listed in Table 3 1 3 Forthe Model 819 press the CHANNEL key and the A or key until the desired channel is reached then implement step 2 4 The alarms take on the new values immediately The ALARM SET switch only deactivates the ability to set the alarms if it is in the OFF 0 position 3 6 MODEL 819 CHANNEL SELECTION The Model 819 has four sensor inputs or channels numbered 1 thru 4 To change the display input press the CHANNEL key and either the A or key The channel input position displays t
11. the Model 819 repeat steps 2 through 7 for channels 2 3 and 4 5 2 Maintenance Lake Shore Model 818 819 Cryopump Monitor User s Manual APPENDIX A CURVE INFORMATION Table A 1 Curve 0 DT 500DI 8B Voltage Temperature Characteristics az z4wm 1729 07086 zs as za 100 0 68125 as 23e 5 tower 1980 so 8 200 06502 ss zanm 14 tore 2050 so 450 t0 oss ss 225 so towrs 06106 2240 sso to 2200 7s so tme z5o 08852 3s so 21 sso toas 200 ss zuse wo t0 3o ze 750 oss 5 2o 0596 ss ose osmo ose 051469 zo 1 sso a 2550 08165 19 oss sw ose 3r o sew ose 2700 040148 awe 150 osuas 35 10 ies oso 3 04451 we ewe oswre exe osa 200 040075 sem osa 14mm osse 2 300 osrws zo sem 03696 35 awe woo oso
12. the desired curve number displays If a curve is not present it is skipped in the sequence To select the alarm action push the LO ALARM key 0 for the Model 818 operation or the HI ALARM key 1 for DIGI K operation 5 Turn OFF 0 DIP switch number 4 on the instrument rear marked CURVE SET The instrument returns to normal operation with the new curve and alarm action selected Note A different curve can be assigned to each of the four Model 819 channels independently However the alarm action applies to all four channels Table 3 1 Standard Curves and Alarm Temperature Limits e 0 349 3 515000 0 349 3 prsoonrcer 0 349 CrCuveC 0 324 9 5 DT 500D1 8C 0 324 9 Eod DT 470 Curve 10 0 474 9 3 5 ALARM OPERATION The Model 818 can set two alarm trip points HI and LO associated with the single sensor input The Model 819 has four sensor inputs and two alarm trip points HI and LO for each input The deadband is 0 025 for the setpoint less than 100 any units and 0 25 for the setpoint greater than 100 If the display is in voltage then the deadband assumes appropriate kelvin units 3 2 Operation Lake Shore Model 818 819 Cryopump Monitor User s Manual 3 5 4 Checking the Alarm Setpoints To check the HI alarm setpoint press the front panel HI ALARM key The HI alarm setpoint displays in the chosen temperature units If the units are V volts the units indicator changes to K ke
13. 0 VAC operation or 0 125 A for 230 VAC operation For the Model 819 replace the fuse with 0 5 A for 110 VAC operation or 0 25 A for 230 VAC operation 5 Replace fuse holder close fuse compartment and connect the power cord 52 LINE VOLTAGE SELECTION The rear panel three pronged line power connector permits the Model 818 819 to be connected to 115 or 230 VAC line voltages Use the following procedure to change the line voltage CAUTION To prevent shock hazard turn off instrument and disconnect it from AC line power and all test equipment before changing the line voltage 1 Set POWER switch to OFF and disconnect power cord from unit 2 The line voltage selection switch is located to the right of the power connector Use a small screw driver to slide the switch to the 115 or 230 VAC position 3 Install the proper fuse as outlined in Section 5 1 54 CALIBRATION Required equipment 1 Digital Voltmeter Multimeter DVM 4 digit resolution or better 2 Precision Resistors 25 and 125 with a tolerance of 0 01 or better Warm up unit for one hour to achieve rated specifications 5 4 1 Current Source Calibration 1 Configure the 125 resistor to simulate a sensor in the two lead configuration shown in Figure 2 1 For the Model 819 install the 125 resistor in INPUT 1 Set the Model 819 into scan mode with all dwell times set 0 and select channel 1 as the display channel 2 Connect DVM voltage le
14. 00 052 no ms so 1e 250 050 s so 103 200 e 99 e 10 250 ws 1069 200 0470 so oo 10 ss 91 200 0442 3 me oso 0487 3 16s i oss 200 o4 o me so oss 290 xs em 9 oss 2 300 038 eo ee 9 s os 300 0378 3s em 100 oss 03616 eo see so osse sso ose 3s moo osse 300 90 14 os 350 0 3104 100 300 oss 3 zo 10401 1250 oes x 12 1 1 A 6 Appendix A Curve Information Lake Shore Model 818 819 Cryopump Monitor User s Manual Table A 7 Curve 6 DT 470 Voltage Temperature Characteristics ge Voltage Voltage Voltage 25 sa so f s ___ 0946 00273 3e ws seo 2700 058060 ar eas 25 seo 1058 0576 3s fener as 6 00707 3 o 08592 2 2o 1s oo 0ws oo 05894 e 028 05093
15. 2 Quick Basic Communication Program Table of Contents Page NNNNNNNNNNN N 3 1 1 1 hPa 12 3 d 4 Qo Qo CO Qo Co Co WW Co Lake Shore Model 818 819 Cryopump Monitor User s Manual LIST OF ILLUSTRATIONS Figure No Title 2 1 Sensor 3 1 Model 818 and 819 Cryopump Monitor Front Panels 3 2 Model 818 and 819 Cryopump Monitor Rear B 1 Model 818 819 Mounting een LIST OF TABLES Table No Title 1 1 Model 818 and 819 Specifications 2 1 Sensor Connections for the J1 INPUTS 2 emen 2 2 tert tpe o Dip na t pee peines 2 3 J4 Monitors meer 3 1 Standard Curves and Alarm Temperature Limits 3 2 Alarm Action 0 818 excede de ceat 3 2B Aarm Action T iei ce oet i e rtr ei Een A 1 Curve 0 DT 500DI 8B Voltage Temperature Characteristics A 2 Curve 1 DT 500DI 8A Voltage Temperature Characteristics A 3 Curve 2 DT 500DRC D Voltage Temperature Characteristics A 4 Curve 3
16. 40 mK C at 77 0 72 at 300 20 at 300 12 Kat 475 3 mK C at 475 Magnetic Field Use Recommended T gt 40 lt 5 ALARMS Number of Alarms 818 Two 819 Eight two per channel Alarm Type One high and one low per channel Alarm Deadband 0 25 above 100 0 025 below 100 Alarm Contact One normally open and one normally closed relay contact per alarm UL rated at 250 VAC or 30 VDC at 5 A 110 VDC at 0 6 A FRONT PANEL Sensor Display 4 digit LED display in voltage or temperature F Annunciators 818 Alarm Status Channel Units 819 Alarm Status Channel Units Scan Display Resolution 0 1 degree above 100 any units 0 01 degree below 100 voltage to 0 001 mV Keys 818 HI LO Alarm A V 819 Channel HI LO Alarm A V INTERFACE Serial Interface RS 232C electrical format 300 baud RJ 11 connector Linearized Analog Output 818 0 to 1 volt represents 0 to 1000 819 not applicable GENERAL Ambient Temperature Range 15 to 35 C Power 90 125 or 210 250 VAC selected via rear panel switch 50 or 60 Hz 818 7 VA 819 10 VA Dimensions 105 x 132 x 254 mm 4 125 x 5 25 x 10 inches Panel mount EIA Weight 1 6 kilograms 3 5 pounds 1 2 Introduction Lake Shore Model 818 819 Cryopump Monitor User s Manual CHAPTER 2 INSTALLATION 2 1 GENERAL This chapter covers Inspection and Unpacking Paragraph 2 1 Repackaging for Shipment Pa
17. 819 Scan Parameter Commands Y Set Channel Dwell Time Input Y lt Channel gt lt Dwell Time Index Returned Nothing Remarks Channel 0 to 4 Dwell Time Index 0 0 seconds skip 1 5 seconds 2 10 seconds 3 30 seconds 4 60 seconds Example For a 30 second dwell time on channel 2 type Y23 YC Select Channel Input YC lt Channel gt Returned Nothing Remarks Channel 0 to 4 Example Type YC3 to move scanner to channel 3 YS Enable Scan Input YS Returned Nothing YH Hold Disable Scan Input YH Returned Nothing Remote Operation 4 3 4 4 Lake Shore Model 818 819 Cryopump Monitor User s Manual This Page Intentionally Left Blank Remote Operation Lake Shore Model 818 819 Cryopump Monitor User s Manual CHAPTER 5 MAINTENANCE 5 1 CHECKING OR REPLACING FUSE CAUTION To prevent shock hazard turn off instrument and disconnect it from AC line power and all test equipment before replacing fuse 1 Set POWER switch to OFF and disconnect power cord from unit 2 The fuse compartment is located to the right of the power connector Carefully pry open the fuse compartment cover with a small screw driver 3 Remove the upper fuse holder by sliding it out of its position with the screw driver CAUTION For continued protection against fire hazard replace only with fuse of same type and rating specified for the line voltage selected 4 Forthe Model 818 replace the fuse with 0 25 A for 11
18. DT 500DRC E1 Voltage Temperature Characteristics A 5 Curve 4 CTI Diode Voltage Temperature 51 5 A 6 Curve 5 DT 500DI 8C Voltage Temperature Characteristics 7 Curve 6 DT 470 Voltage Temperature Em 7 Table of Contents Lake Shore Model 818 819 Cryopump Monitor User s Manual CHAPTER 1 INTRODUCTION 1 4 GENERAL The information contained in this manual pertains to the installation operation remote programming options and accessories and calibration procedures for the Lake Shore Cryotronics Inc Model 818 and 819 Cryopump Monitors and the Balzers TMU 121 Cryopump Monitor NOTE The TMU 121 is identical to the Model 818 except for the addition of a back panel keylock switch Users may wire two silicone diode sensors directly to the TMU 121 the keylock switch selects which input to display All other front panel and RS 232 operation is identical to the Model 818 1 2 DESCRIPTION The Model 818 819 is a microprocessor controlled instrument which provides direct digital display of temperature with up to 4 digits of resolution in or F and sensor voltage to 1 mV The Model 818 features one input with two alarms The alarms can be used to safeguard or initiate and control automatic cryopump regeneration cycles The alarms are configured as HI a
19. S need c dri bad 3 4 1 Curve and Alarm Action Selection ssssssssssssssssseeeneee 3 5 ALARM OPERATION ec ctetu ret eei edi 3 5 1 Observing the Alarm nennen 3 5 2 Alarm Actionin n e itte ti best teg ut st 3 5 3 Latching or Non Latching and LO Alarms 3 5 4 Setting the HI and LO 3 6 CHANNEL SELECTION FOR THE MODEL 819 3 6 1 Channel Stanem etel vei ditio ei iil ei 3 6 2 Setting the Dwell Time for a Given 1 seem 4 REMOTE OPERATION 4 1 RS 232C SERIAL INTERFACE 5 42 INTERFACE COMMANDS 4 2 1 Display and Alarm Parameter Commands sse 4 2 2 Output Request 4 2 3 Model 819 Scan Parameter Commands sss 5 MAINTENANCE 5 1 FUSE REPLACEMENT M reet eene eui 5 2 LINE VOETAGE SELECTION tates ssc etr et t e aeris 5 3 CALIBRATION aiii i rite em e d e tu ui te te Test EIL 5 4 1 Current Source Calibration 5 4 2 A D Converter memet enne APPENDIX A Curve Information APPENDIX B Model 818 819 Mounting Adapter APPENDIX C Sample RS 23
20. ads across resistor and adjust the rear panel trimpot marked ADJ until voltage across resistor is 1 2500 volts 100 microvolts Maintenance 5 1 Lake Shore Model 818 819 Cryopump Monitor User s Manual 5 4 2 Converter Calibration 1 Setthe display unit to V NOTE A D calibration accuracy using resistors depends on current source calibration accuracy Complete Current Source Calibration Paragraph 5 4 1 prior to A D Converter Calibration 2 Configure the 125 kQ resistor to simulate a sensor in the two lead configuration shown in Figure 2 1 For the Model 819 install the 125 resistor in INPUT 1 and select channel 1 as the display channel 3 Press the rear panel CAL ENABLE push button The unit displays CAL to indicate readiness to store a new A D calibration Within 2 seconds press the A key if not pressed within 2 seconds the display returns to normal display operation The unit displays CAL for approximately 15 seconds to indicate active calibration When calibration is complete the display returns to normal display operation The instrument should now display 1 250V Replace the 125 resistor with the 25 resistor Press the rear panel CAL ENABLE push button The unit displays CAL Within 2 seconds press the W key Again the unit displays CAL for approximately 15 seconds and then returns to normal operation The instrument should now display 0 250V 8 Calibration is complete for the Model 818 For
21. eval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the express written permission of Lake Shore Lake Shore Model 818 819 Cryopump Monitor User s Manual TABLE OF CONTENTS Chapter Paragraph Title T INTRODUCTIO N uen 1 1 GENERAL iade eei e iat ie tied Rade ede Het odas Se Eva ee P a Pot ees 1 2 DESCRIPTION entice tied ied de Uie nd sed ce du s e dee du d ee 2 s E 2 1 GENERAL uii i emis ab Set bes Port 2 2 INSPECTION AND ener 2 3 REPACKAGING FOR SHIPMENT eene 24 POWER AND GROUNDING REQUIREMENTS sss 2 4 1 Power 5 2 4 2 Power Cord and Grounding 2 5 SENSOR AND INTERFACE CONNECTIONS sse 2 5 1 J1 Sensor Input Connections 2 5 2 J2 Seriald Q ront din gti ta ette dtes 2 5 3 o air m e jh 2 5 4 JA Monitors ane nm ete 3 OPERATING INSTRUCTIONS La EE UE E EE ER 3 1 GENERAL xo Ine 3 2 CONTROLS AND 1 eren ener 3 3 VOLTAGE AND TEMPERATURE sss 3 4 STANDARD CURVE
22. g Format Asynchronous Number of Stop Bits 1 Transmission Mode Half Duplex Data Interface Levels Transmits Receives using EIA voltage levels Baud Rate 300 42 INTERFACE COMMANDS The paragraphs below define RS 232C Interface Commands and their format Enter switch and channel IDs as integers no decimal point Enter temperatures to 0 1 degrees If entered with greater precision they truncate to the nearest 0 1 degree Enter temperatures with or without a decimal point For example any of the following are valid temperature entries 5 5 0 24 98 3 235 Temperature is bounded by upper and lower sensor limits listed in Table 3 1 4 2 1 Display and Alarm Parameter Commands Select Display Units Input FOC FOF FOV Returned Nothing Remarks Sets display units to Kelvin K Celsius C Fahrenheit F or Volts V H Set High Alarm Setpoint Input Model 818 H lt Temperature gt Model 819 lt Channel gt H lt Temperature gt Returned Nothing Remarks Sets the High Alarm setpoint Channel 0 to 4 Example For a setpoint of 300 on the Model 818 type H300 For a setpoint of 31 2 on channel 3 on the Model 819 type 3H31 2 Select temperature units from the unit keyboard or by using the FO command L Set Low Alarm Setpoint Input Model 818 L lt Temperature gt Model 819 lt Channel gt L lt Temperature gt Returned Nothing Remarks Sets the Low Alarm setpoint Channel 0 to 4 Example For a se
23. ick Basic Program
24. le Button Switch 4 Curve Set 7 115 230 AC Voltage Selection Switch 10 2 SERIAL I O Serial Interface Figure 3 2 Model 818 and 819 Cryopump Monitor Rear Panels Operation 3 1 Lake Shore Model 818 819 Cryopump Monitor User s Manual 3 3 VOLTAGE OR TEMPERATURE DISPLAY The Model 818 and 819 Cryopump Monitors read in voltage or temperature kelvin Celsius or Fahrenheit To change units press the A key or the key or send a command over the RS 232C Serial Interface 3 4 STANDARD CURVES The unit stores several standard curves Different curves may be assigned to each channel of the Model 819 These curves numbered 0 thru 9 are listed on the front cover of this manual as well as in Table 3 1 The front cover also indicates the factory curve configuration of the unit Curve 6 DT 470 Curve 19 is the standard curve selected unless specified differently upon ordering Tables of voltage versus temperature for these standard curves appear in Appendix A 3 4 1 Curve and Alarm Action Selection To change or check the selected curve or alarm action use the procedure below 1 For the Model 819 press the CHANNEL key and the A or key until the desired channel displays 2 Turn ON 1 DIP switch number 4 on the instrument rear marked CURVE SET 3 Note the display now shows the number 0 or 1 on the left alarm action and a number between 0 and 9 on the right standard curve 4 change the curve push either the A or key until
25. lvin and the setpoint displays in kelvin Similarly to check the LO alarm press the LO ALARM key 3 5 2 Alarm Action The Model 818 and 819 have two different alarms that can be selected when the sensor curve is selected Alarm action 0 is the Model 818 operation and alarm action 1 is the DIGI K operation See Table 3 2A and 3 2B for a truth tables of the respective alarm actions Table 3 2A Alarm Action 0 Model 818 Contact Positions Display Reading Compared to LO Alarm HI Alarm Table 3 2B Alarm Action 1 DIGI K Contact Positions Display Reading Compared to LO Alarm HI Alarm LO Alarm HI Alarm COM 3 5 3 Latching or Non Latching HI and LO Alarms When the rear panel ALARM LATCH DIP switch is OFF 0 relays close or open as specified in Table 3 2 If the sample sensor temperature oscillates around the HI or LO alarm setpoint temperature then the relay opens and closes in an oscillatory fashion following the alarm action There is a deadband around the setpoint as specified in Paragraph 3 5 to eliminate chattering of relay contacts When the ALARM LATCH switch is ON 1 the alarm relays take on a latching configuration When the sample sensor temperature forces the alarm to go from NO to NC the relays remain closed There are three ways to reopen the relay 1 From the Front Panel hold the HI ALARM and LO ALARM keys down for more than 2 seconds The ALARM STATUS light
26. modular socket The connector pins are numbered 1 thru 6 from left to Pin Description right Table 2 2 lists connector pin assignments NOTE When converting from the RJ 11 to DB 25 connector pins 5 6 8 Received Data and 20 of the DB 25 connector may need to be shorted together for Signal Ground proper interface operation Transmitted Data 2 5 3 J3 Alarms The HI and LO alarm contacts are present on rear panel card edge connections The Model 818 has 6 contact card edge connector for the HI and LO alarms The Model 819 has one 6 contact card edge for Input 1 HI and LO alarms and one 18 contact card edge connector for Input 2 thru Input 4 HI and LO alarms The top and bottom contacts of the card edge are identical in definition and the mating connector supplied shorts them together The SPDT alarm contacts are in groups of three 1 COM 2 or NO IH NC representing the contacts for the Input 1 HI alarm 1 or NO represents the N ormally O pen state 2 or NC represents the N ormally C losed state The card edge is slotted between pins 2 and 3 to allow for mating connector keying Chapter 3 details alarm action Table 2 3 J4 Monitors 2 5 4 J4 Monitors Connections With an Model 818 MN or 818 LA Option the J4 Monitors connector is EET present Table 2 3 lists connector pin assignments 2 2 Installation Lake Shore Model 818 819 Cryopump Monitor User s Manual CHAPTER 3 OPERATION 31 GENERAL This chap
27. nce with the printed instruction provided This warranty is in lieu of any other warranties expressed or implied including merchantability or fitness for a particular purpose which are expressly excluded the owner agrees that Lake Shore s liability with respect to this product shall be set forth in this warranty and incidental or consequential damages are expressly excluded 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 ACKNOWLEDGMENT Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks Where those designations appear in this manual and Lake Shore was aware of a trademark claim the designations have been printed in initial capital letters and the or n symbol used CalCurve Carbon Glass Cernox Duo Twist Gamma Probe Quad Lead and Quad Twist are trademarks of Lake Shore Cryotronics Inc Copyright 1988 1999 by Lake Shore Cryotronics Inc All rights reserved No portion of this manual may be reproduced stored in a retri
28. nd ID alarms Set alarm setpoints from the front panel with function keys and up down keys or simply check them without changing their values The alarm setpoint resolution is 0 1 or F over the sensor temperature range Table 3 1 describes sensor temperature ranges For security the up down keys can be deactivated by a rear panel DIP switch A deadband around each setpoint reduces or eliminates relay contact chattering The Model 819 features four inputs with two alarms as described above for each input The Model 819 can also scan between channels with dwell times of 0 skip 5 10 30 or 60 seconds for each channel The Model 818 819 directly reads temperature from Lake Shore DT 470 or DT 500 Series Temperature Sensors All DT 470 sensors follow the same temperature response curve and come in four bands of tracking Low temperature 2 to 100K accuracies range from 0 25K for band 11 to 1K for band 13 The units have a specified temperature range of 4 to 475 K with DT 470 sensors and 4 to 325 K with DT 500 sensors Diode sensor voltages are digitized with a resolution of 100 mV out of 3 volts full scale The accuracy of the electronics with DT 470 sensors is better than 0 01 below 28K and 0 1 above 28K The equivalent display temperature rounds to 0 1 above 100 any units and 0 01 below 100 The Model 818 819 features an RS 232C Serial Interface which allows users to monitor temperature and monitor and change alarm setpoints f
29. o the left of the display Hold the CHANNEL key for greater than one second to toggle the scan mode and greater than two seconds to display the dwell time for the selected channel 3 6 1 Channel Scan In hold mode the Model 819 internally scans each channel and updates alarms approximately every 8 seconds In scan mode the Model 819 continuously monitors the displayed channel and updates its alarms only If a channel is excluded from the scan sequence its dwell time is set to 0 the alarms of this channel are not updated To enable or disable the scan hold the CHANNEL key in for greater than one second The Model 819 enters the SCAN mode as indicated by the SCAN annunciator 3 6 2 Setting Channel Dwell Time To set the dwell time for a given channel hold in the CHANNEL key for greater than two seconds and use the A or V keys to increment or decrement the dwell times between 0 skip 5 10 30 and 60 seconds Next increment the channel and repeat the dwell time setting process 3 4 Operation Lake Shore Model 818 819 Cryopump Monitor User s Manual CHAPTER 4 REMOTE OPERATION 41 RS 232C SERIAL INTERFACE The Models 818 and 819 feature a serial RS 232C interface which allows communication with a host computer see Table 4 1 below Table 4 1 Model 818 819 RS 232C Interface Specifications Transmission Three Wire Bits per Character 7 not including start stop or parity bits Connector RJ Il Modular Socket Parity Type odd Timin
30. pting any repair Instrument model and serial number User name company address and phone number Malfunction symptoms Description of system Returned Goods Authorization RGA number Repack the system in its original container if available Affix shipping labels and FRAGILE warnings Write RGA number on the outside of the container or on the packing slip If not available consult Lake Shore for shipping and packing instructions Qus N 2 4 POWER AND GROUNDING REQUIREMENTS 24 41 Power Requirements The Model 818 819 requires a power source of 50 to 60 Hz single phase 90 125 or 210 250 VAC For the Model 818 replace the fuse with 0 25 A for 110 VAC operation or 0 125 A for 230 VAC operation For the Model 819 replace the fuse with 0 5 A for 110 VAC operation or 0 25 A for 230 VAC operation CAUTION Verify rear panel line voltage selection switch Figure 3 2 Key 2 matches AC voltage source Verify proper fuse installation before inserting power cord and turning on instrument 2 4 2 Power Cord and Grounding Requirements A three prong detachable power cord for 120 VAC operation which mates with the rear panel UL IEC ICEE Standard plug ships with the instrument To protect operating personnel the National Electrical Manufacturer s Association NEMA recommends and some local codes require instrument panels and cabinets be grounded The three prong power cable when plugged into an appropriate receptacle grounds the ins
31. pump Monitor User s Manual This Page Intentionally Left Blank Appendix B 818 819 Mounting Adapter Lake Shore Model 818 819 Cryopump Monitor User s Manual APPENDIX C SAMPLE RS 232 QUICK BASIC COMMUNICATION PROGRAM 1 OPEN com1 300 0 7 1 RS FOR RANDOM AS 1 LEN 256 2 11 INPUT ENTER COMMAND AS 3 PRINT 1 AS CHRS 13 CHR 10 4 LINE INPUT 1 5 5 PRINT BS 6 GOTO 11 Line 1 Defines COM1 port for input output at 300 baud odd parity 7 data bits and 1 stop bit The LEN value selects the maximum length of the input output string in ASCII characters Line 2 Prompts for the command and enters it into variable A Line 3 Sends the command to the Model 818 819 CHR 13 is a Carriage Return and CHR 10 is a Line Feed The semi colon at the end suppresses the automatic Carriage Return Line 4 Retrieves the Model 818 819 response If the Model 818 819 does not respond the program stops and waits for a response It stores the response in variable B Line 5 Prints the Model 818 819 response on the screen Line 6 Jumps back to line 2 in effect starting the program over To stop the program or if the program receives no response from the Model 818 819 press and hold the Control CTRL key and the Break on the computer keyboard Appendix C Sample Quick Basic Program C 1 2 Lake Shore Model 818 819 Cryopump Monitor User s Manual This Page Intentionally Left Blank Appendix C Sample Qu
32. ragraph 2 2 Power and Ground Requirements Paragraph 2 3 and Sensor and Interface Connections Paragraph 2 4 2 2 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 five 5 days from receipt of 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 See the standard Lake Shore Warranty on the A Page immediately behind the title page 2 3 REPACKAGING FOR SHIPMENT To return the Model 818 819 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 attem
33. rom a host computer Sensor input s alarm contacts and RS 232C lines are located on the instrument rear panel Introduction 1 1 Lake Shore Model 818 819 Cryopump Monitor User s Manual Table 1 1 Model 818 819 Specifications THERMOMETRY Inputs 818 one 819 four Measurement Type Isolated 4 lead Sensor order separately Lake Shore DT 470 or DT 500 Series Silicon Diode Sensors Sensor Temperature Coefficient Negative Sensor Units Volt V Input Range 0 to 3 volts Sensor Excitation constant current 10 0 01 Update Rate 818 One reading per 0 6 second 819 One reading per 0 6 second continuous 1 2 seconds on channel change Scan Dwell Time 818 not applicable 819 O skip 5 10 30 60 seconds for each channel Example Lake Shore Sensor DT 470 CO 11 Sensor Temperature Range 1 4 to 475 K Standard Curve Curve 10 DT 500DI 8A DT 500DI 8B DT 500DI 8C DT 500DRC D DT 500DRC E1 CTI Curve C Typical Sensor Sensitivity 30 mV K at 4 2 K Measurement Resolution 1 9 mV K at 77 K Sensor Units 0 1 mV 2 3 mV K at 300 K Temperature Equivalence 4 mK C at 4 2 2 2 mV K at 475 K 53mK C at 77 42 at 300 46 at 475 Measurement Accuracy Measurement Temperature Coefficient Sensor Units 0 3 mV 0 04 of reading Sensor Units ambient 0 0075 Temperature Accuracy 0 3 4 2 Temperature Equivalence 4 mK C at 4 2 0 62 at 77
34. ssto o we o 150 ore 2 3050 0392 1 wes or 300 ose 150 oe 950 036 15 oem 1 3200 0268 00 o oe ___ Appendix A Curve Information A 5 Lake Shore Model 818 819 Cryopump Monitor User s Manual Table A 6 Curve 5 DT 500DI 8C Voltage Temperature Characteristics 349 zem 42 zem 2 1190 0828 25 118 0810 4s 25 20 12 7 10 orem 4s sms 1 t9 150 orex so 2s 200 11 4600 52 25 110 0756 2sm so ss 20o mso ss 55 5 so 10 6 ort so 4m 3 108 oes ss 4s u sso 100 1900 105 190 Gera 7s sm so 10 200 065 so 2554 o 10 2050 06466 x ss 22076 3 200 06315 22 400 10 250 0616 ss aem eo ww 200 oo 218 10 250 058 os 21 o 10e 200 e o 195 250 056 s 0 500 102 4 240 0 0540 xo 0 s20 we xs s 1m 2
35. ter covers Controls and Indicators Paragraph 3 2 Voltage or Temperature Display Paragraph 3 3 Standard Curves Paragraph 3 4 Alarm Operation Paragraph 3 5 and Channel Selection for the Model 819 Paragraph 3 6 3 2 CONTROLS AND INDICATORS Note The unit completes an internal update cycle of between and 7 second before responding to a front panel key entry A key pressed for less than second may be ignored 5 ML oa 7 CHANNEL HI ALARM HI ALARM 4 LO ALARM LO ALARM 8 a Lake Shore Cryotronics a Lake Shore Cryotronics 1 Active Channel Indicators 5 Four Digit Display 2 SCAN Indicator 6 Units Indicators V F 3 CHANNEL Key 7 Hl and LO Alarm Status Indicators One for each channel 4 HI ALARM and LO ALARM Keys 8 Increment A and Decrement Keys Figure 3 1 Model 818 and 819 Cryopump Monitor Front Panels iS NOSNC bs set p J2 SERIAL L come sr CURVE SET ALARM LATCH ALARM LATCH 1 Line Cord Receptacle with Fuse and ON OFF Switch 8 J4 MONITORS Connector 2 J1 Inputs Input 1 818 J1 1 J1 2 J1 3 J1 4 819 9 4 Position Configuration DIP Switch 3 J3 Alarms Channels 2 3 and 4 LO and HI Outputs Switch 1 Reserved 4 ADJ Current Source Adjustment Potentiometer Switch 2 Alarm Latch 5 J3 Alarms Channel 1 LO and HI Outputs Switch 3 Alarm Set 6 CAL Calibration Enab
36. tpoint of 21 1 on the Model 818 type L21 1 For a setpoint of 21 1 on channel 3 on the Model 819 type 3L21 1 Select temperature units from the unit keyboard or by using the FO command R Reset Alarms Input R Returned Nothing Remarks Resets the alarms Remote Operation 4 1 4 2 2 818 Only Input Returned Remarks WA Input Returned Remarks WD Input Returned Remarks WS Input Returned Remarks WY Input Returned Remarks 4 2 Lake Shore Model 818 819 Cryopump Monitor User s Manual Output Request Commands Query Sensor Reading Alarm Setpoints and Alarm Status S lt Reading gt lt Units gt lt Alarm 1 Setpoint Alarm 2 Setpoint gt Alarm 1 Status Alarm 2 Status Units Kelvin C Celsius Fahrenheit or V Volts Alarm Status A Active or I Inactive Query Switch ID and Alarm Data WA Model 818 Switch ID High Alarm Setpoint gt t lt Low Alarm Setpoint gt Model 819 Switch ID Channel 1 High Alarm Setpoint Channel 1 Low Alarm Setpoint gt lt Channel 2 High Alarm Setpoint Channel 2 Low Alarm Setpoint gt lt Channel 3 High Alarm Setpoint gt lt Channel 3 Low Alarm Setpoint gt lt Channel 4 High Alarm Setpoint gt lt Channel 4 Low Alarm Setpoint gt Switch ID 0 to 7 For Model 819 only equals the sum of 2 if alarm is set plus 4 for relay latching Query Sensor Reading s WD Model
37. trument Installation 2 1 Lake Shore Model 818 819 Cryopump Monitor User s Manual 2 5 SENSOR AND INTERFACE CONNECTIONS 2 5 1 J1 Sensor Input Connections The Model 818 has one rear panel 5 pin sensor input connector Table 2 1 Sensor Connections designated J1 INPUT 1 The Model 819 has four rear panel 5 pin sensor for the INPUTS input connectors designated J1 1 J1 2 J1 3 and J1 4 for inputs 1 thru 4 Table 2 1 lists sensor lead connection definitions and Figure 2 1 illustrates them Current Out Use four wire connection Figure 2 1A to avoid IR drops in the voltage Current Out sensing pair resulting in temperature measurement error Use two wire connection Figure 2 1B in less critical applications where lead D Voltage Sense resistance is small and small readout errors can be tolerated Voltage Sense Lake Shore QUAD LEAD 36 Gauge Cryogenic wire is ideal for sensor Shield connections since the four color coded leads run together The wire is Phosphor Bronze with a Formvar insulation and Butryral bonding between the four leads Color coding Figure 2 1 Sensor Connections id d EE clear and blue for easy wire A Four Lead Sensor Hookup B Two Lead Sensor Hookup identification 1 Ee 1 m D CV 9 2 2 5 2 J2 Serial The RS 232C Serial Interface connector is rear panel mounted RJ 11 Table 2 2 Serial Connections
38. ufacturer warrants the instrument and probes to be free from defects in material and workmanship for a period of twelve months from the date of shipment During the warranty period under authorized return of instruments or component parts to Lake Shore freight prepaid the company will repair or at its option replace any part found to be defective in material or workmanship without charge to the Owner for parts service labor or associated customary shipping cost Replacement or repaired parts are warranted for only the unexpired portion of the original warranty All products are thoroughly tested and calibrated to published specifications prior to shipment Calibration Certifications are offered for six month periods only To update such documentation Lake Shore offers a re certification service at reasonable cost LIMITATION OF WARRANTY This warranty is limited to Lake Shore products purchased and installed in the United States or Internationally through our approved distribution agents This same protection will extend to any subsequent owner during the warranty period It does not apply to damage resulting from improper or inadequate maintenance unauthorized modification or misuse operation outside of the environmental specifications or from buyer supplied software interfacing It does not apply to damage caused by accident misuse fire flood or Acts of God or from failure to properly install operate or maintain the product in accorda
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