Table of Contents
Advertisement
Quick Links
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
USER'S MANUAL
Model 818
Model 818
Model 818
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
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
P/N 119-003
819
819
819
13 April 1999
Advertisement
Table of Contents
Summary of Contents for Lakeshore 818
- Page 1 USER’S MANUAL Model 818 Model 818 Model 818 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...
- Page 2 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual LIMITED WARRANTY Lake Shore Cryotronics, Inc. (henceforth Lake Shore), the manufacturer, 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.
-
Page 3: Table Of Contents
Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual TABLE OF CONTENTS Chapter/Paragraph Title Page INTRODUCTION ..........................GENERAL ........................DESCRIPTION ......................INSTALLATION ..........................GENERAL ........................INSPECTION AND UNPACKING................REPACKAGING FOR SHIPMENT ................POWER AND GROUNDING REQUIREMENTS............2.4.1 Power Requirements.................... - Page 4 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual LIST OF ILLUSTRATIONS Figure No. Title Page Sensor Connections........................Model 818 and 819 Cryopump Monitor Front Panels ............... Model 818 and 819 Cryopump Monitor Rear Panels ..............Model 818/819 Mounting Detail....................
-
Page 5: Introduction
4 digits of resolution in K, °C 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 and ID alarms. Set alarm setpoints from the front panel with function keys and up/down keys, or simply check them without changing their values. - Page 6 Input Range: 0 to 3 volts Sensor Excitation (constant current): 10 µA ±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 = 0(skip), 5, 10, 30, 60 seconds for each channel.
-
Page 7: Installation
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. -
Page 8: Sensor And Interface Connections
J3 Alarms The HI and LO alarm contacts are present on rear panel card edge connections. The Model 818 has one 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. -
Page 9: General
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. -
Page 10: Voltage And Temperature Display
— 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. -
Page 11: 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. -
Page 12: Setting The Hi And Lo Alarms
Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual 3.5.4 Setting the HI 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. -
Page 13: Remote Operation
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 F0 command. -
Page 14: Output Request Commands
Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual 4.2.2 Output Request Commands (818 Only) Query Sensor Reading, Alarm Setpoints, and Alarm Status Input: Returned: ±<Reading><Units>,±<Alarm 1 Setpoint>,±< Alarm 2 Setpoint >,<Alarm 1 Status>, <Alarm 2 Status> Remarks: Units = K (Kelvin), C (Celsius), F (Fahrenheit), or V (Volts). Alarm Status = A (Active) or... -
Page 15: Model 819 Scan Parameter Commands
Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual 4.2.3 Model 819 Scan Parameter Commands Set Channel Dwell Time Input: Y<Channel><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. - Page 16 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual This Page Intentionally Left Blank Remote Operation...
-
Page 17: Maintenance
4. 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. -
Page 18: A/D Converter Calibration
7. The unit displays -CAL- Within 2 seconds, press the t 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 the Model 819, repeat steps 2 through 7 for channels 2, 3, and 4. Maintenance... -
Page 19: Appendix Acurve Information
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 PROM PROM PROM Temp. K Temp. K Temp. K Voltage Voltage Voltage 2.41773 29.0 1.11353 175.0 0.72353 2.40475 30.0 1.10729... - Page 20 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual Table A-2. Curve #1: DT-500DI-8A Voltage/Temperature Characteristics PROM PROM PROM Temp. K Temp. K Temp. K Voltage Voltage Voltage 2.46386 29.0 1.11741 175.0 0.71308 2.44821 30.0 1.11007 180.0 0.69891 2.43188 32.0...
- Page 21 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual Table A-3. Curve #2: DT-500DRC-D Voltage/Temperature Characteristics PROM PROM PROM Temp. K Temp. K Temp. K Voltage Voltage Voltage 2.5984 21.0 1.3505 180.0 0.70757 2.5958 22.0 1.3006 185.0 0.69344 2.5932 23.0...
- Page 22 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual Table A-4. Curve #3: DT-500DRC-E1 Voltage/Temperature Characteristics PROM PROM PROM Temp. K Temp. K Temp. K Voltage Voltage Voltage 2.6591 18.0 1.6527 145.0 0.8035 2.6567 19.0 1.5724 150.0 0.7896 2.6542 20.0...
- Page 23 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual Table A-5. Curve #4: CTI Diode Voltage/Temperature Characteristics PROM PROM PROM Temp. K Temp. K Temp. K Voltage Voltage Voltage 10.0 1.4000 55.0 1.0235 190.0 0.6545 11.0 1.3850 60.0 1.0100 195.0...
- Page 24 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual Table A-6. Curve #5: DT-500DI-8C Voltage/Temperature Characteristics PROM PROM PROM Temp. K Temp. K Temp. K Voltage Voltage Voltage 2.6187 24.0 1.2317 135.0 0.8377 2.6074 25.0 1.1900 140.0 0.8243 2.5956 26.0...
- Page 25 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual Table A-7. Curve #6: DT-470 Voltage/Temperature Characteristics PROM PROM PROM PROM Temp. K Temp. K Temp. K Temp. K Voltage Voltage Voltage Voltage 1.69808 1.40615 1.06700 0.61465 10.5 52.0 260.0 1.69674...
- Page 26 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual This Page Intentionally Left Blank Appendix A: Curve Information...
-
Page 27: Appendix B - Model 818/819 Mounting Adapter
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 ¼-panel EIA rack space, use the optional Model 818/819 Mounting Adapter shown in Figure B-1. Figure B-1. Model 818/819 Mounting Detail... - Page 28 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual This Page Intentionally Left Blank Appendix B: 818/819 Mounting Adapter...
-
Page 29: Appendix C - Sample Rs-232 Quick Basic Communication Program
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. - Page 30 Lake Shore Model 818 / 819 Cryopump Monitor User’s Manual This Page Intentionally Left Blank Appendix C: Sample Quick Basic Program...