AMI 1700 Manual

Revision 2; 3 August 2016
American Magnetics, Inc.
P.O. Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509, Tel: [phone], Fax: [phone]
MODEL 1700
LIQUID LEVEL INSTRUMENT
(LIQUID NITROGEN VERSION)
INSTALLATION, OPERATION, AND
MAINTENANCE INSTRUCTIONS
EXCELLENCE IN MAGNETICS AND CRYOGENICS
1CoverPage

Revision 2; 3 August 2016

Rev. 2 i
Table of Contents
Cover Page...................................................................................................... i
Table of Contents ........................................................................................... i
List of Figures................................................................................................ v
List of Tables ................................................................................................ ix
Foreword ....................................................................................................... xi
Purpose and Scope ............................................................................................. xi
Contents of this Manual ..................................................................................... xi
General Precautions ..........................................................................................xii
Cryogen Safety Summary ................................................................................xiii
Safety Legend .................................................................................................. xiv
Equipment Warnings......................................................................................... xv
Instrument Configuration.................................................................................. xv
Introduction ................................................................................................... 1
1.1 Model 1700 Instrument....................................................................................... 1
1.1.1 Cryogenic (Capacitance-Based) Liquid Level Sensors ......................... 1
1.1.2 Digitally-Controlled............................................................................... 3
1.1.3 System Flexibility .................................................................................. 3
1.1.4 Display ................................................................................................... 3
1.1.5 Intuitive Human-Interface Design ......................................................... 4
1.1.6 Measurement Flexibility ........................................................................ 4
1.1.7 Real Time Clock .................................................................................... 4
1.1.8 Valve Control Output............................................................................. 4
1.1.9 Analog Outputs ...................................................................................... 4
1.1.10 Signal Relays.......................................................................................... 4
1.1.11 Connectivity........................................................................................... 4
1.2 Model 1700 Front Panel Layout ......................................................................... 6
1.3 Model 1700 Rear Panel Layout .......................................................................... 6
1.4 Model 1700 Specifications @ 25°C.................................................................... 7
Installation ................................................................................................... 11
2.1 Unpacking and Inspecting the Instrument ........................................................ 11
2.2 Mounting the Model 1700 Instrument .............................................................. 11
2.3 Installing Capacitance-Based Liquid Level Sensors......................................... 11
1 Table of
Contents

ii Rev. 2
Table of Contents
2.4 Connecting the Sensor to the Instrument .......................................................... 12
2.4.1 Connecting a Capacitance Sensor ........................................................13
2.5 Setting Up an Autofill System ......................................................................... 14
2.5.1 Autofill System Description................................................................. 14
2.5.2 Autofill System Setup .......................................................................... 16
2.6 Power Requirements ......................................................................................... 17
Operation ......................................................................................................19
3.1 Energizing the Model 1700 Instrument............................................................. 19
3.2 Screen Navigation ............................................................................................. 19
3.2.1 Home Screen Footer............................................................................. 19
3.3 Navigating the Instrument Menus..................................................................... 20
3.3.1 Menu Overview.................................................................................... 20
3.3.2 Editing a Field...................................................................................... 24
3.3.3 Menu Navigation.................................................................................. 26
3.4 Capacitance (Liquid Nitrogen) Level................................................................26
3.4.1 Configure the instrument to display nitrogen level..............................26
3.4.2 Other Liquid Helium Functions ........................................................... 27
3.4.3 Other Liquid Helium Functions ........................................................... 27
3.5 Alarms and Relays ............................................................................................ 27
3.5.1 Overview .............................................................................................. 27
3.5.1.1 Level-Based Alarms.................................................................. 27
3.5.1.2 Time-Based Fill Alarm ............................................................. 28
3.5.1.3 Multiple alarms ......................................................................... 28
3.5.2 Configuring Alarm Setpoints ............................................................... 29
3.5.3 Acknowledging an Alarm .................................................................... 29
3.5.4 Muting an Alarm.................................................................................. 30
3.5.5 Resetting the Autofill Timeout Alarm .................................................30
3.6 Configure the Autofill Function........................................................................ 31
3.6.1 Autofill overview ................................................................................. 31
3.6.2 Setting the autofill parameters ............................................................. 31
3.6.3 Enable the Autofill function................................................................. 31
3.7 Select the appropriate units on the display........................................................32
3.8 Analog output signals........................................................................................ 32
3.8.1 Connecting to the Aux Connector........................................................32
3.8.2 Configuring the Analog Outputs.......................................................... 33
3.9 Ethernet Connectivity........................................................................................ 33
3.9.1 IP Addressing Scheme ......................................................................... 33
3.10 Abnormal Operation.......................................................................................... 34

Rev. 2 iii
Table of Contents
3.10.1 Capacitance Sensor Contamination ..................................................... 34
3.10.2 Resetting the Instrument to Factory Defaults ...................................... 35
3.11 Shutting the Instrument Down .......................................................................... 36
Calibration.................................................................................................... 37
4.1 Setting the System Date and Time.................................................................... 37
4.2 Capacitance-based Level Calibration................................................................ 38
4.2.1 Understanding the Sensor Active Length ............................................ 38
4.2.2 Relationship between Calibration and Sensor Length ......................... 40
4.2.3 Variations in the Dielectric with Changing Density ............................ 40
4.2.4 Capacitance-based Sensor Calibration Methods.................................. 41
4.2.4.1 Selection of Capacitance Sensor Calibration Methods............. 42
4.2.5 Pre-Calibration Procedure.................................................................... 44
4.2.5.1 Enter Capacitance Sensor Information ..................................... 44
4.2.5.2 Performing Loss of Sensor Calibration .................................... 46
4.2.6 Performing an Open Dewar Calibration .............................................. 48
4.2.7 Approximate Calibration...................................................................... 49
4.2.8 Closed Dewar Calibration.................................................................... 53
4.2.8.1 Presetting the maximum and minimum calibration points ....... 53
4.2.8.2 Completing the closed dewar calibration procedure................. 55
Remote Interface Reference....................................................................... 61
5.1 SCPI Command Summary ................................................................................ 61
5.2 SCPI Ethernet Communication ......................................................................... 61
5.3 SCPI Serial (RS-232) Communication ............................................................. 62
5.3.1 Serial port connector and cabling......................................................... 62
5.4 Command/return termination characters........................................................... 62
5.5 Command Set Reference................................................................................... 63
5.5.1 Commands for determining the instrument configuration................... 63
5.5.2 Commands for setting the units of measurement................................. 68
5.5.3 Commands for configuring setpoints................................................... 69
5.5.4 Commands for setting the channel identifiers...................................... 72
5.5.5 Commands for making liquid level measurements.............................. 73
5.5.6 Commands for calibrating level sensors .............................................. 74
5.5.7 System Commands............................................................................... 75
5.6 Error Codes ....................................................................................................... 76
Service and Repair ...................................................................................... 79
6.1 Cleaning ............................................................................................................ 79
6.2 User Replaceable Parts...................................................................................... 79

iv Rev. 2
Table of Contents
6.3 Battery Replacement ......................................................................................... 80
6.3.1 Tools Required ..................................................................................... 80
6.3.2 Procedure.............................................................................................. 80
6.4 Fuse Replacement ............................................................................................. 81
6.4.1 Tools Required ..................................................................................... 81
6.4.2 Procedure.............................................................................................. 81
Appendix.......................................................................................................83
A.1 Connector Wiring.............................................................................................. 83
A.1.1 Serial (RS-232) Connector ................................................................... 83
A.1.2 Ethernet Connector............................................................................... 84
A.1.3 Aux I/O Connector............................................................................... 85
A.2 Troubleshooting ................................................................................................ 86
A.3 Firmware Licenses ............................................................................................ 86
Glossary........................................................................................................95
Abbreviations and Acronyms Used in This Manual ......................................... 95
Index..............................................................................................................97

Rev 2 v
List of Figures
Figure 1-1 Model 1700 Instrument using internal oscillator/transmitter 2
Figure 1-2 Model 1700 Instrument using external oscillator/transmitter3
Figure 1-3 Model 1700 Nitrogen Instrument Via Web Browser............... 5
Figure 1-4 Model 1700 Front View; Dual Channel Instrument Shown ... 6
Figure 2-1 Model 1700 Instrument in an Autofill configuration ............ 15
Figure 2-1 Typical Autofill Setup ............................................................. 15
Figure 2-2 Loss Of Nitrogen Level Sensor ............................................... 17
Figure 3-1 LN2 Home Screen ................................................................... 19
Figure 3-2 Home Screen Footer ................................................................ 20
Figure 3-3 MENU button on HOME screen............................................. 20
Figure 3-4 MENU Selection Screen.......................................................... 20
Figure 3-5 HOME button on MENU screen............................................. 20
Figure 3-6 BACK button ........................................................................... 20
Figure 3-7 Field Editing Footer ................................................................ 24
Figure 3-8 Model 1700 Menu Structure ................................................... 26
Figure 3-9 INTERNAL Oscillator Indicated ............................................ 27
Figure 3-10 Nitrogen Level Displayed on Home Screen ........................... 27
Figure 3-11 Fill Timeout Alarm Screen ..................................................... 28
Figure 3-12 Output Configuration Screen, Page 1 .................................... 29
Figure 3-13 Relay Source Configuration .................................................... 29
Figure 3-14 Relay Setpoints........................................................................ 29
Figure 3-15 Alarm Condition Above or Below Setpoints........................... 29
Figure 3-16 Alarm Annunciator ................................................................. 30
Figure 3-17 LO LEVEL Alarm Condition Footer Displays ....................... 30
Figure 3-18 Muted Alarm Condition .......................................................... 30
Figure 3-19 Autofill Level Control Selection.............................................. 31
Figure 3-20 Autofill Level Start Setting .................................................... 31
Figure 3-21 Autofill Timeout Setting ......................................................... 31
Figure 3-22 LN2 Home Screen ................................................................... 32
Figure 3-23 Analog Outputs Source Selection ........................................... 33
Figure 3-24 Network Selection ................................................................... 33
Figure 3-25 Editing Network Selection...................................................... 33
Figure 3-26 Editing Network Settings ....................................................... 33
Figure 3-27 Saving Network Settings ........................................................ 34
Figure 3-28 System Menu, Page 2.............................................................. 35
Figure 3-29 Resetting Instrument to Factory Defaults............................. 35
Figure 3-30 Invoking Instrument Shut Down ........................................... 36
Figure 3-31 Confirming Instrument Shut Down ....................................... 36
Figure 4-1 Menu Selection From Home Screen ....................................... 37
Figure 4-2 Menu Selection Screen............................................................ 37
Figure 4-3 System Menu, Page 1.............................................................. 37
Figure 4-4 System Menu, Page 2.............................................................. 38
1Listof
Figures

vi Rev 2
List of Figures
Figure 4-5 Typical Capacitance-based Liquid Level Sensor....................39
Figure 4-6 Dielectric vs. pressure for nitrogen under saturated conditions.
41
Figure 4-7 Calibration method selection diagram....................................43
Figure 4-8 MENU Selection Button ..........................................................44
Figure 4-9 SENSORS Selection Button ....................................................44
Figure 4-10 NITROGEN OSCILLATOR Selection.....................................44
Figure 4-11 CALIBRATE NITROGEN Selection Button...........................45
Figure 4-12 SENSOR ACTIVE LENGTH field ..........................................45
Figure 4-13 Footer BACK Button Selection................................................45
Figure 4-14 SYSTEM Menu Selection ........................................................45
Figure 4-15 PERFORM MAX CAL. Selection Button ................................46
Figure 4-16 Home Selection Button ............................................................46
Figure 4-17 MENU Selection Button ..........................................................46
Figure 4-18 SENSORS Selection Button ....................................................47
Figure 4-19 CALIBRATE NITROGEN Selection Button...........................47
Figure 4-20 NO SENSOR CAL button........................................................47
Figure 4-21 MENU Selection Button ..........................................................48
Figure 4-22 SENSORS Selection Button ....................................................48
Figure 4-23 CALIBRATE NITROGEN Selection Button...........................48
Figure 4-24 PERFORM MAX CAL. Selection Button ................................48
Figure 4-25 Updated MAX CAL Frequency................................................49
Figure 4-26 PERFORM MIN CAL. Selection Button.................................49
Figure 4-27 MENU Selection Button ..........................................................50
Figure 4-28 SENSORS Selection Button ....................................................50
Figure 4-29 CALIBRATE NITROGEN Selection Button...........................50
Figure 4-30 PERFORM MAX CAL. Selection Button ................................50
Figure 4-31 Updated MAX CAL Frequency................................................51
Figure 4-32 PERFORM MIN CAL. Selection Button.................................51
Figure 4-33 APPROX. CAL. VALUE field ..................................................52
Figure 4-34 MAX CAL values edited...........................................................52
Figure 4-35 MENU Selection Button ..........................................................54
Figure 4-36 SENSORS Selection Button ....................................................54
Figure 4-37 CALIBRATE NITROGEN Selection Button...........................54
Figure 4-38 PERFORM MIN CAL. Selection Button.................................54
Figure 4-39 PERFORM MAX CAL. Selection Button ................................55
Figure 4-40 PERFORM MAX CAL. Selection Button ................................55
Figure 4-41 PERFORM MAX CAL. Selection Button ................................56
Figure 4-42 PERFORM MAX CAL. Selection Button ................................57
Figure 4-43 Updated MAX CAL Frequency................................................58
Figure A-1 Serial (RS-232) Pin Out ...........................................................83
Figure A-2 Ethernet Connector Socket Pin out.........................................84

Rev 2 vii
List of Figures
Figure A-3 Aux I/O Connector................................................................... 85

viii Rev 2
List of Figures