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AMI 1720 Installation, Operation And Maintenance Instructions

Dual liquid level instrument
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EXCELLENCE IN MAGNETICS AND CRYOGENICS
1 Cover Page
MODEL 1720
DUAL LIQUID LEVEL INSTRUMENT
INSTALLATION, OPERATION, AND
MAINTENANCE INSTRUCTIONS
American Magnetics, Inc.
P.O. Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509, Tel: 865-482-1056, Fax: 865-482-5472
Revision 1 - July 2022

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  • Page 1 EXCELLENCE IN MAGNETICS AND CRYOGENICS 1 Cover Page MODEL 1720 DUAL LIQUID LEVEL INSTRUMENT INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS American Magnetics, Inc. P.O. Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509, Tel: 865-482-1056, Fax: 865-482-5472 Revision 1 - July 2022...
  • Page 2 Revision 1 - July 2022...

  • Page 3: Table Of Contents

    Model 1720 Specifications @ 25°C........
  • Page 4 Mounting the Model 1720 Instrument ........
  • Page 5 MERICAN AGNETICS ABLE OF ONTENTS Configuring the Normal Autofill Function ........49 Flowchart of Normal Autofill Function.
  • Page 6 Compatibility Support for the Legacy AMI Model 286 ....... . .
  • Page 7 MERICAN AGNETICS ABLE OF ONTENTS Assignment Commands and Queries ..........115 Channel Calibration Commands and Queries .
  • Page 8 MERICAN AGNETICS ABLE OF ONTENTS Glossary ................. 143 Abbreviations and Acronyms ..........143 Index..................

  • Page 9: Foreword

    ONTENTS OF THIS ANUAL Introduction describes the functions, specifications, and characteristics of the Model 1720 Instrument. It provides illustrations of the front and rear panel layouts as well as documenting the performance specifications. Additional information is provided in the form of system block diagrams.

  • Page 10: General Precautions

    ENERAL RECAUTIONS Remote Interface Reference documents all remote commands and queries available through the Model 1720 Instrument RS-232 and Ethernet interfaces. A quick-reference summary of commands is provided as well as a detailed description of each. The Appendix and Glossary sections support the information in the sections listed above.
  • Page 11 MERICAN AGNETICS OREWORD ENERAL RECAUTIONS systems; the temperature extremes they are typically subjected to cause seals to fail frequently. In the event a person is burned by a cryogen or material cooled to cryogenic temperatures, the following first aid treatment should be given pending the arrival and treatment of a physician or other medical care worker: 1.

  • Page 12: Cryogen Safety Summary

    MERICAN AGNETICS OREWORD RYOGEN AFETY UMMARY austinetic Ni-Cr alloys exhibit good ductility at these low temperatures ® and the most widely used is 18-8 stainless steel. Copper, Monel , brass and aluminum are also considered satisfactory materials for cryogenic service. RYOGEN AFETY UMMARY...

  • Page 13: Equipment Warnings

    Doing so could result in a life-threatening explosion. Do not modify this equipment in any way. If component replacement is required, return the equipment to AMI facilities as described in the troubleshooting section of this manual. If used in a manner not specified in this manual, the protection provided by the design, manufacture and documentation of the Model 1720 Instrument may be impaired.
  • Page 14 MERICAN AGNETICS OREWORD THER ANUAL ONVENTIONS THER ANUAL ONVENTIONS This manual may often refer to measuring liquid nitrogen (LN ) when referring to capacitance-based level measurement since nitrogen is by far the most common cryogenic liquid measured by a capacitance-based sensor.

  • Page 15: Introduction

    (autofill) based on user set parameters. The Model 1720 Instrument is designed for use with up to two RYOGENIC capacitance-based sensors for cryogenic liquids (except for helium).
  • Page 16 (OTHER MOUNTING OPTIONS AVAILABLE) TOTAL SENSOR LENGTH ACTIVE SENSOR SENSOR LENGTH (SPECIFY) NOTE: TWO LIQUID LEVEL SENSORS OF A PROPERLY CONNECTED WARM SENSOR CAN READ ~ +2% UNTIL COOL ANY LENGTH MAY BE CONNECTED Model 1720 System Diagram using internal oscillator/transmitter...
  • Page 17 (OTHER MOUNTING OPTIONS AVAILABLE) TOTAL SENSOR LENGTH ACTIVE SENSOR SENSOR LENGTH (SPECIFY) NOTE: TWO LIQUID LEVEL SENSORS OF A PROPERLY CONNECTED WARM SENSOR CAN READ ~ +2% UNTIL COOL ANY LENGTH MAY BE CONNECTED Model 1720 System Diagram using external oscillator/transmitters...

  • Page 18: Display

    The menus are presented in a logical fashion so that the operation of the Model 1720 is intuitive to the user. Context-sensitive Help screens are also provided.

  • Page 19: Analog Outputs

    Once the cooling time has expired, the vent valve is closed and the second valve control output opens the line to fill. The Model 1720 Instrument has four analog outputs, two 0-10 V NALOG UTPUTS voltage outputs and two 4-20 mA current loop outputs.
  • Page 20 NTRODUCTION ODEL NSTRUMENT The Model 1720 Instrument allows for remote operation with an external browser via TCP/IP connection. All commands that are available by touching the local screen are available via the web browser Model 1720 (Normal mode) Via Web Browser...

  • Page 21: Model 1720 Front Panel Layout

    1720 F MERICAN AGNETICS NTRODUCTION ODEL RONT ANEL AYOUT 1720 F ODEL RONT ANEL AYOUT Model 1720 Front View...

  • Page 22: Model 1720 Rear Panel Layout

    VALVE CONTROL VALVE CONTROL ETHERNET AUX I/O CHANNEL 2 Model 1720 Rear Panel Description Ethernet Network Connector (RJ-45) RS-232 Serial and Contact Sense Connector (DB9 female) Aux I/O Connector (HD15 female) Channel 1 Capacitive Sensor Input Connector (BNC female) Channel 1 Switched Valve Outlet Socket (IEC-60320 C13)

  • Page 23: Model 1720 Specifications @ 25°C

    1720 S @ 25°C MERICAN AGNETICS NTRODUCTION ODEL PECIFICATIONS 1720 S @ 25°C ODEL PECIFICATIONS System Architecture Display: 4.3” 24-bit color TFT display, 480x272 pixel with resistive touch screen Sensor Types: Capacitance-based liquid level Maximum Length Readout: Capacitance-based liquid level up to 999 in...
  • Page 24 1720 S @ 25°C MERICAN AGNETICS NTRODUCTION ODEL PECIFICATIONS Relays №1, №2, №3, №4 (W171DIP-7, or equivalent): Contact Form: 1 Form A (SPST-NO) Maximum Switched Current: 3 A Switching Voltage: 60 V / 100 V Level Control (Solid State): Rated Load Voltage: 2 A at 100 to 240 V...
  • Page 25 1720 S @ 25°C MERICAN AGNETICS NTRODUCTION ODEL PECIFICATIONS Environmental Limits Ambient Temperature: Operating: 0°C to 40°C [32°F to 104°F]; Non-operating: -20 °C to 60 °C [-4 °F to 140 °F] Relative Humidity: 0 to 95%; non-condensing Maximum Instrument Background Field:...

  • Page 26: Controller Modes Description

    ONTROLLER ODES ESCRIPTION The Model 1720 provides a unique feature in the availability of three modes for level control. The function of each mode is summarized below and a diagram is provided to help illustrate the function. The controller modes provide flexibility for solving a wide range of level control problems with a minimum of external hardware or logic.

  • Page 27: Auto-Changeover Mode

    In auto-changeover mode, as illustrated in the figure below, the Model HANGEOVER 1720 monitors and controls liquid level measured via Channel 1, and uses liquid supplied from two storage vessels. The fill start and stop setpoints for Channel 1 function as the liquid level control band for the single level-controlled dewar.

  • Page 28: Pre-Cool Mode

    During the time the vent valve is open, the cryogen cools the transfer line, so that there is a minimal amount of cryogen gas entering the controlled dewar once the fill valve is opened. Model 1720 AMERICAN MAGNETICS, INC. 100-240 VAC OAK RI DGE, TN, USA...

  • Page 29: Installation

    OUNTING THE ODEL NSTRUMENT If the Model 1720 Instrument is to be used as a table top model, place the equipment on a flat, secure surface. If the Model 1720 Instrument is to be rack mounted, install it in a 19"...

  • Page 30: Capacitance-Based Liquid Level Sensor Installation

    If there is any shipping damage, save all packing material and NOTE contact the shipping representative to file a damage claim. Do not return the instrument to AMI unless prior authorization has been received. 2. Install the sensor in the vessel using the specified fitting of the sensor.

  • Page 31: Connecting The Capacitance Sensor

    If the transmitter is connected to the sensor with a length of coaxial cable, then a 15 ft standard length cable (part number EH2362) is available from AMI. Contact the factory for more details and speak to an Authorized AMI Technical Representative before using cables longer than 15 feet.
  • Page 32 MERICAN AGNETICS NSTALLATION APACITANCE ASED IQUID EVEL ENSOR NSTALLATION Moisture or contaminants in any of the BNC coaxial CAUTION connectors can short out the sensor and cause an erroneous readings or transmitter failure. A pack of non- conductive electrical connection lubricant (ECL or “Dielectric Tune-up Grease”) has been included with the liquid level sensor packaging to reduce the possibility of this occurring.

  • Page 33: Configuring An Autofill System

    The valve should be controlled by the Model 1720 Instrument. For the standard dual-autofill function, each channel acts independently. ORMAL The system consists of a Model 1720 Instrument with two liquid level UTOFILL YSTEM sensors, and a solenoid-operated flow valve for each channel. The...
  • Page 34 This can occur if the solenoid operated fill valve and the supply dewar isolation valve are closed, trapping a cryogenic liquid in a confined volume. All AMI transfer line systems include a relief valve to preclude this sort of event.
  • Page 35 5. Connect the solenoid valve to the IEC60320 C13 valve socket on the Model 1720 Instrument rear panel labeled CHANNEL 1 VALVE CON- TROL Connect the IEC320 C14 inlet connector and instrument power cord to an appropriate power source (see the Power Requirements on page 16).
  • Page 36 5. Connect the solenoid valve to the IEC60320 C13 valve socket on the Model 1720 Instrument rear panel labeled CHANNEL 2 VALVE CON- TROL Connect the IEC320 C14 inlet connector and instrument power cord to an appropriate power source (see the Power Requirements on page 16).

  • Page 37: Auto-Changeover System Setup

    1720 switches to the alternate dewar allowing the autofill function to proceed while the emptied dewar is refilled or replaced. The system consists of a Model 1720 Instrument with a liquid level sensor,and a solenoid-operated flow valve for each supply dewar. The instrument makes continuous level measurements and based on level, energizes the selected supply dewar valve to begin liquid transfer.
  • Page 38 This can occur if the solenoid operated fill valve and the supply dewar isolation valve are closed, trapping a cryogenic liquid in a confined volume. All AMI transfer line systems include a relief valve to preclude this sort of event. CAUTION The switched valve outlet socket switches the line voltage to which the instrument mains power is connected.
  • Page 39 8. Connect the solenoid valve power cord to the IEC60320 C13 valve sock- on the Model 1720 Instrument rear panel labeled CHANNEL 2 VALVE CONTROL Connect the IEC320 C14 inlet connector and instrument power cord to an appropriate power source (see the Power Requirements on page 16).

  • Page 40: Pre-Cooled System Setup

    Valve Control to complete an autofill. Only one Supply Dewar is utilized in this system mode. The system consists of a Model 1720 Instrument with a liquid level sensor, a solenoid-operated flow valve for the venting function, and a solenoid-operated flow valve for the autofill. The instrument makes...
  • Page 41 This can occur if the solenoid operated fill valve and the supply dewar isolation valve are closed, trapping a cryogenic liquid in a confined volume. All AMI transfer line systems include a relief valve to preclude this sort of event. CAUTION The switched valve outlet socket switches the line voltage to which the instrument mains power is connected.
  • Page 42 For distances greater than 15 feet, insert an external oscillator/ transmitter in-line with the coaxial cable 5. Connect the venting valve power cord to the IEC60320 C13 valve on the Model 1720 Instrument rear panel labeled CHANNEL 2 socket VALVE CONTROL 6. Connect the fill solenoid valve...

  • Page 43: Power Requirements

    65). Connect the voltage output on the AUX I/O connector to a suitable receiver being careful not to exceed the impedance restrictions (refer to “Model 1720 Specifications @ 25°C” on page 9). 4-20 The Model 1720 instrument provides two 4-20 mA...
  • Page 44 It is extremely important to observe all polarities and to not exceed +32VDC for the loop power supply in order to prevent damage to the 4-20mA driver circuit. AUX I/O PIN 1 LOOP POWER MODEL 1720 SUPPLY AUX I/O PIN 2 INSTRUMENT (12-32 VDC)

  • Page 45: Operation

    AMI level sensor. CREEN AVIGATION The Model 1720 can operate in various autofill modes. The normal mode is dual channels that measure and optionally control level independently. Therefore, up to two level measurements can be displayed in the normal configuration.

  • Page 46: Home Screen

    The home screen footer appears as shown at right:     Home Screen Footer Model 1720 Instrument Home Screen Footer Name Function MENU Takes the user to the main menu screen.  ALARM When illuminated, indicates an active alarm ...

  • Page 47: Editing A Field

      edited, the footer changes to Field Editing Footer appear as follows: Model 1720 Instrument Footer during editing a field Name Function SAVE Saves the entries made on the screen. The footer ...

  • Page 48: Menu Structure

    LEVEL SOURCE FOR 4-20 mA OUTPUT #1 {CHANNEL 1 | CHANNEL 2 | DISABLED} TOUCH SCREEN CALIBRATE LEVEL SOURCE FOR 4-20 mA OUTPUT #2 {CHANNEL 1 | CHANNEL 2 | DISABLED} TOUCH SCREEN TEST DRAG DRAW QUIT CURSOR {ON | OFF} FACTORY RESTORE RESTORE Model 1720 Menu Structure...

  • Page 49: Screen Descriptions

    AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS The Model 1720 Instrument displays various screens on the graphic CREEN ESCRIPTIONS display when a MENU item is chosen. The items for each screen are described in the following table. Model 1720 Level Instrument Screen Descriptions...
  • Page 50 MERICAN AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS Model 1720 Level Instrument Screen Descriptions Screen Item Label Field Type or Function LIQUID NITROGEN SENSOR Measured Oscillator Period: Information: <value> μs (present value) X=(1 or 2) CALIBRATION Sensor Active Length: Data entry: <value> cm or in (tap units to...
  • Page 51 MERICAN AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS Model 1720 Level Instrument Screen Descriptions Screen Item Label Field Type or Function OUTPUT CONFIGURATION: ALARMS #1 Alarm active when <input> Toggles between: NONE, CHAN 1, CHAN 2 level is (first) <state> Toggles between: ≤, ≥ followed by data entry <value>...
  • Page 52 MERICAN AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS Model 1720 Level Instrument Screen Descriptions Screen Item Label Field Type or Function OUTPUT CONFIGURATION: RELAYS #1 Relay closes if <input> Toggles between: NONE, CHAN 1, CHAN 2 level is (first) <state> Toggles between: ≤, ≥ followed by data entry <value>...
  • Page 53 MERICAN AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS Model 1720 Level Instrument Screen Descriptions Screen Item Label Field Type or Function OUTPUT CONFIGURATION: AutoFill Mode Control: Toggles between: NORMAL, AUTO- AUTOFILL (AUTOCHANGEOVER) CHANGEOVER, PRECOOL, DISABLED Auto Changeover Initial Fill Toggles between: DEWAR 1, DEWAR 2...
  • Page 54 MERICAN AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS Model 1720 Level Instrument Screen Descriptions Screen Item Label Field Type or Function OUTPUT CONFIG.: ANALOG Level Source for 0-10 VDC Toggles between: OUTPUTS Output #1: DISABLED, CHANNEL 1, CHANNEL 2 Level Source for 0-10 VDC...
  • Page 55 MERICAN AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS Model 1720 Level Instrument Screen Descriptions Screen Item Label Field Type or Function SYSTEM DATE & TIME Current System Date and Time: Information System Timezone: Information SET MANUALLY Move to another screen SET FROM NTP SERVER Action with status screen MENU >...
  • Page 56 MERICAN AGNETICS PERATION AVIGATING THE NSTRUMENT ENUS Model 1720 Level Instrument Screen Descriptions Screen Item Label Field Type or Function LEVEL HISTORY PLOT LN2 Ch1 Enables/disables Channel 1 trace LN2 Ch2 Enables/disables Channel 2 trace < Move graph back in time...

  • Page 57: Capacitance Level Display

    The sensor connection(s) should be completed before powering NOTE EVEL on the Model 1720 as the OSCILLATOR LOCATION is sensed during the boot process. 1. From the main screen, choose the following: MENU > SENSORS. Ensure the desired channels are enabled.

  • Page 58: Alarms And Relays

    PERATION LARMS AND ELAYS LARMS AND ELAYS The Model 1720 Instrument has two types of alarms, level-based and time-based alarms. The Model 1720 provides an Alarm Status screen that summarizes all LARM TATUS alarm states and provides a button for muting.

  • Page 59: Time-Based Fill Alarms Description

    MERICAN AGNETICS PERATION LARMS AND ELAYS The Model 1720 Instrument has an alarm available on each channel to ASED indicate that there is a problem with the autofill function. If enabled, the LARMS ESCRIPTION instrument will start a timer when an autofill condition is initiated, and if the level has not reached the fill stop level within the user-set period of time, an Autofill Timeout alarm will occur.

  • Page 60: Acknowledging An Alarm

    MERICAN AGNETICS PERATION LARMS AND ELAYS 2. Choose the source channel for each alarm (CHAN 1, CHAN 2, or NONE). Alarm Source Configuration 3. Set the levels at which the alarm will be triggered in the Setpoint fields highlighted in red in the image at right.

  • Page 61: Muting An Alarm

    MERICAN AGNETICS PERATION LARMS AND ELAYS c. The Alarm Status screen, accessible by touching the ALARM text in the footer, will display a summary of all alarms. To mute the audible alarm, first UTING AN LARM touch the ALARM text in the footer.
  • Page 62 MERICAN AGNETICS PERATION LARMS AND ELAYS 3. Set the levels at which the relay will be closed in the Setpoint fields. Tapping the units symbol NOTE (%, in, or cm) allows selection of the available unit selections for that channel. RELAYS Setpoints 4.

  • Page 63: Configuring The Normal Autofill Function

    MERICAN AGNETICS PERATION ONFIGURING THE ORMAL UTOFILL UNCTION ONFIGURING THE ORMAL UTOFILL UNCTION The NORMAL mode autofill function consists of two independent autofill controls, one for each sensor channel. The Normal autofill mode concept is described on page 12 and the step-by-step hardware installation guide can be found on page 19.

  • Page 64: Setting The Normal Autofill Parameters

    MERICAN AGNETICS PERATION ONFIGURING THE ORMAL UTOFILL UNCTION 1. From the MENU screen, choose OUTPUTS and then choose AUTOFILL. ETTING THE ORMAL UTOFILL ARAMETERS 2. Toggle the AutoFILL Mode Control button until NORMAL is displayed. NORMAL Autofill Mode Selection 3. Choose whether Autofill Ch. 1 is ENABLED or DISABLED.

  • Page 65: Enable The Normal Autofill Function

    MERICAN AGNETICS PERATION ONFIGURING THE ORMAL UTOFILL UNCTION 5. Enter the Fill Timeout interval. If this is a non-zero value, then if the Fill Stop Level is not reached within the Fill Timeout interval, a Timeout alarm will be activated (see page 44), the fill cycle will be interrupted, and the valve control for the channel will de-energize.

  • Page 66: Clearing The Autofill Timeout Alarm

    MERICAN AGNETICS PERATION ONFIGURING THE ORMAL UTOFILL UNCTION Normal Autofill States Abbreviation State in Footer Description Overrides M-CLOSED Manual Close: De-energizes the None valve control socket on the rear panel. AUTO-OFF Disables the AUTOFILL function. None Normal Autofill Information-Only States Abbreviation State in Footer...

  • Page 67: Configuring The Auto-Changeover Autofill Function

    The Auto-Changeover autofill mode concept is described on page 13 and the step-by-step hardware installation guide can be found on page 23. When the Model 1720 is in the ISPLAY FOR Auto-Changeover autofill mode,...
  • Page 68 START LEGEND AUTOCHANGEOVER FILL CYCLE C1 = CONTACT 1 C2 = CONTACT 2 LEVEL < LAST FILL (OR INITIAL) C2 STATE C1 STATE START LEVEL? SOURCE = SUPPLY 1? = EMPTY? = EMPTY? OVERALL TIME > 0 & EXPIRED? C1 STATE C2 STATE = EMPTY? = EMPTY?
  • Page 69 MERICAN AGNETICS PERATION ONFIGURING THE HANGEOVER UTOFILL UNCTION The availability of a supply dewar to accomplish an autofill cycle can be indicated by one or both of the following methods: a fill time limit (i.e. Autochange Time) or external dry contact sense (i.e. Empty Contact State).
  • Page 70 MERICAN AGNETICS PERATION ONFIGURING THE HANGEOVER UTOFILL UNCTION 4. Choose the Empty Contact State for supply dewars (i.e. fill sources) #1 and #2. The selected contact state specifies the remote (external) relay contact state that indicates a respective tank is empty and cannot be used for a fill cycle.

  • Page 71: Enable The Auto-Changeover Autofill Function

    MERICAN AGNETICS PERATION ONFIGURING THE HANGEOVER UTOFILL UNCTION reaching the Stop Level for a given fill cycle, a timeout alarm will activate and the fill cycle will be interrupted. The Overall timeout specifies a total time limit in minutes for the autofill cycle regardless of the supply dewar source.

  • Page 72: Clearing The Auto-Changeover Overall Timeout Alarm

    MERICAN AGNETICS PERATION ONFIGURING THE HANGEOVER UTOFILL UNCTION The Auto-Changeover autofill function has four manually-selectable states by touching the fill state indicator either in the HOME screen or in the footer: Auto-Changeover Autofill States State Description Overrides AUTO-ON Automatically maintains the single Autofill will generate a Timeout target dewar level between fill START alarm and cease filling if the fill...

  • Page 73: Configuring The Pre-Cooled Autofill Mode

    The Pre-Cooled autofill mode concept is described on page 14 and the step-by-step hardware installation guide can be found on page 26. When the Model 1720 is in the ISPLAY FOR Pre-Cooled autofill mode, the...

  • Page 74: Flowchart Of Pre-Cooled Autofill Function

    MERICAN AGNETICS PERATION ONFIGURING THE OOLED UTOFILL The diagram below illustrates the logical flow of the Pre-Cooled Autofill LOWCHART OF function. OOLED UTOFILL UNCTION START PRECOOL FILL CYCLE PRECOOL LEVEL PRECOOL TIME ENERGIZE AC < > 0? OUTLET FOR FILL START? CHANNEL 2 FILL DE ENERGIZE AC...
  • Page 75 MERICAN AGNETICS PERATION ONFIGURING THE OOLED UTOFILL 2. Toggle the AutoFILL Mode Control button until PRECOOL is displayed. PRECOOL Autofill Mode Selection 3. Enter the Precool Time value in minutes. This is the time span where the venting valve is opened to allow gases to escape while the transfer line is cooling, but the fill valve is closed to the...

  • Page 76: Enable The Pre-Cooled Autofill Function

    MERICAN AGNETICS PERATION ONFIGURING THE OOLED UTOFILL If the Fill value is set to 0 minutes, the timeout function NOTE Timeout is effectively disabled. 6. Ensure SAVE is selected to save the settings and then press HOME in the footer to return back to the level display. The Pre-Cooled autofill function must be enabled after the settings are NABLE THE configured.

  • Page 77: Clearing The Pre-Cooled Fill Timeout Alarm

    MERICAN AGNETICS PERATION ELECTING THE PPROPRIATE NITS ON THE ISPLAY Pre-Cooled Information-Only States State Description PRECOOL Information-only display indicating the autofill cycle is in the venting state before the actual fill cycle. FILLING Information-only display indicating the fill valve is open to the target dewar and is timed according to the Fill Timeout setting.

  • Page 78: Damping Configuration

    MERICAN AGNETICS PERATION AMPING ONFIGURATION AMPING ONFIGURATION The level measurement function offers a damping feature which can be used to dampen fluctuations in the level reading that arise from sloshing liquids or other surface disruptions. To set the damping for a given sensor channel: 1.

  • Page 79: Analog Output Signals

    MERICAN AGNETICS PERATION NALOG UTPUT IGNALS NALOG UTPUT IGNALS Refer to “Aux I/O Connector” on page 134 of the Appendix for a connector pin-out. 1. From the MENU screen, choose ONFIGURING THE OUTPUTS, then ANALOG NALOG UTPUTS OUTPUTS. 2. Choose the source for the 0-10 VDC outputs and 4-20 mA outputs as desired.

  • Page 80: Serial Connectivity

    MERICAN AGNETICS PERATION ERIAL ONNECTIVITY 3. If STATIC is chosen for the addressing scheme, enter Address, Netmask, And Gateway values that are appropriate for the connected network. Once an address field is touched, the pop-up keyboard will be presented for data entry. Press SAVE when done.
  • Page 81 MERICAN AGNETICS PERATION ERIAL ONNECTIVITY 3. From the SYSTEM CONFIGURATION screen choose RS232 SETUP. SYSTEM CONFIGURATION Screen 4. The RS-232 Configuration screen shows the current function for the serial connection. RS-232 SERIAL PORT CONFIGURATION Screen 5. Choose the alternate function for the serial connection if desired.

  • Page 82: Abnormal Operation

    This is a physical phenomenon and does not indicate any problem with your AMI level equipment. Limit or eliminate exposure of cold sensors to humidified air to avoid this condition.

  • Page 83: Resetting The Instrument To Factory Defaults

    Resetting Instrument to Factory Defaults HUTTING THE NSTRUMENT The Model 1720 Instrument is a Linux-based computer system NOTE and in order to ensure the file system is properly unmounted, the SHUTDOWN function should be invoked. If it is not, i.e. the...
  • Page 84 MERICAN AGNETICS PERATION HUTTING THE NSTRUMENT 2. Choose SHUTDOWN again to confirm. 3. When prompted, turn off the front panel power switch. Confirming Instrument Shutdown...

  • Page 85: Calibration

    AGNETICS ALIBRATION ALIBRATION Model 1720 instrument is calibrated at the factory for a specific length sensor(s) for use in a specific liquid(s). The calibration length(s) and calibration liquid(s) are listed on the calibration sticker on the bottom of the instrument.For capacitance sensors, if the factory calibration method utilized was approximate, the calibration will be noted as an approximate value.
  • Page 86 MERICAN AGNETICS ALIBRATION ETTING THE YSTEM ATE AND 3. From the SYSTEM CONFIGURATION screen choose SET TIME. SYSTEM CONFIGURATION Screen 4. In the SYSTEM DATE & TIME screen, choose to either set the date and time manually, or set it automatically from an NTP server if the instrument has Internet access.
  • Page 87 MERICAN AGNETICS ALIBRATION ETTING THE YSTEM ATE AND to take effect. If the entered Timezone supports Daylight Savings Time (DST), then the local time will be automatically adjusted to DST. 6. Choose SAVE in the footer after all the fields have been edited as necessary.

  • Page 88: Capacitance-Based Level Calibration

    2.5 cm (1 in) below the upper vent hole is typically the 100% calibration point. Without entry of the active length, the instrument will not be NOTE able to read out in units other than percent. Model 1720 Instrument requires the user to enter the calibrated, or active length,...

  • Page 89: Relationship Between Calibration And Sensor Length

    — see page 89 for a detailed discussion of the approximate calibration method. If any questions exist in regard to calibration issues, contact AMI for assistance in determining the optimal calibration strategy. All references to “dielectric constant” herein refer to the unitless NOTE relative dielectric to ε...

  • Page 90: Capacitance-Based Sensor Calibration Methods

    Occasionally customers ask AMI to calibrate an instrument and sensor for a liquid which is not available at AMI for calibration purposes and/or for a sensor which is too long to be calibrated at our facilities.
  • Page 91 EVEL ALIBRATION For the case where a sensor is too long to be calibrated in AMI facilities, AMI will perform a partial length open dewar calibration in liquid nitrogen, and then calculate the MAX calibration point. A dielectric ratio may also be subsequently utilized to adjust for a target liquid other than liquid nitrogen.

  • Page 92: Pre-Calibration Procedure

    BASED EVEL ALIBRATION If the instrument and sensor are purchased as a unit from AMI, then the factory calibration, including sensor serial number and sensor physical parameter information entered at the factory, will be adequate in most cases. However, for the exceptions noted in the previous paragraphs (which are approximate calibrations), the customer should perform a more accurate open dewar or closed dewar calibration if at all possible.
  • Page 93 MERICAN AGNETICS ALIBRATION APACITANCE BASED EVEL ALIBRATION If the capacitance sensor will be longer than 15 feet from the NOTE instrument, ensure an Oscillator/Transmitter is used between the instrument and the sensor. 4. Choose which channels are enabled and displayed on the HOME screen.
  • Page 94 OSS OF ENSOR ALIBRATION The Model 1720 will detect when the liquid level sensor has been disconnected from the instrument and display a notification on the front panel. If the instrument has been configured for autofill, the fill valve will be shut, requiring operator intervention to resume autofill operation.
  • Page 95 MERICAN AGNETICS ALIBRATION APACITANCE BASED EVEL ALIBRATION 1. Press the MENU button in the lower left corner of the display screen. MENU Selection Button 2. Choose the SENSORS selection from the MENU screen. SENSORS Selection 3. Press the CAL Ch. 1 or CAL Ch.

  • Page 96: Open Dewar Calibration

    MERICAN AGNETICS ALIBRATION EWAR ALIBRATION EWAR ALIBRATION The Open Dewar Calibration requires the customer to have access to a filled dewar where the full active length of the sensor can be dipped. 1. Press the MENU button in the lower left corner of the display screen.
  • Page 97 MERICAN AGNETICS ALIBRATION EWAR ALIBRATION 5. The instrument will display the following screen as it takes data. Once the calibration measurement stabilizes, press the SAVE button. The operator must press the SAVE button for the new cal point to be saved. Updating MAX CAL Period 6.

  • Page 98: Closed Dewar Calibration

    MERICAN AGNETICS ALIBRATION LOSED EWAR ALIBRATION LOSED EWAR ALIBRATION A calibration can be performed in a closed dewar system by monitoring the liquid level while transferring the target liquid to an initially empty (or near empty) dewar at a constant rate. In order to insure success with the closed dewar technique, it is necessary to prepare the instrument by presetting the calibration minimum and maximum calibration points outside the estimated level range.
  • Page 99 MERICAN AGNETICS ALIBRATION LOSED EWAR ALIBRATION 3. Press the CAL Ch. 1 or CAL Ch. 2 button. CAL Channel Selection 4. Press the PERFORM MIN CAL button. 5. While displaying “Reading Sensor...”, the instrument will display the MIN LEVEL PERIOD. Press the SAVE button to save the new minimum level calibration point.

  • Page 100: Completing The Closed Dewar Calibration Procedure

    MERICAN AGNETICS ALIBRATION LOSED EWAR ALIBRATION 10. Enter C into the instrument by touching the APPROX MAX CAL field. 11. Using the pop up numeric keypad, enter the C value and press the SAVE button. 12. With the sensor connected, again press the PERFORM APPROX MAX CAL Entry MIN CAL button and SAVE the...
  • Page 101 MERICAN AGNETICS ALIBRATION LOSED EWAR ALIBRATION 5. Press the PERFORM MIN CAL button. 6. While displaying “Reading Sensor...”, the instrument will display the MIN LEVEL PERIOD. Press the SAVE button to save the new minimum level calibration point. PERFORM MIN CAL Selection Note that the waveform NOTE period listed to the right of the PERFORM MIN CAL button is...
  • Page 102 If the sensor was made in a custom configuration, refer to the sensor documentation and/ or drawing or contact AMI. Example: 20" active length sensor: When the sensor is calibrated by the closed dewar procedure, the actual length of calibration will be 21"...

  • Page 103: Approximate Calibration

    MERICAN AGNETICS ALIBRATION PPROXIMATE ALIBRATION PPROXIMATE ALIBRATION This procedure is the least accurate form of calibration and should be used only when the aforementioned calibration procedures are not viable. The approximate calibration method can be used in cases where the sensor cannot be dipped into the target liquid, the full active length of the sensor cannot be dipped into an open dewar, or both.
  • Page 104 MERICAN AGNETICS ALIBRATION PPROXIMATE ALIBRATION 4. Position the capacitance sensor in the substitute liquid at the 100% level. Hold the sensor at this location and press the PERFORM MAX CAL button. PERFORM MAX CAL Selection 5. “Reading Sensor...”, the instrument will display the maximum period.
  • Page 105 MERICAN AGNETICS ALIBRATION PPROXIMATE ALIBRATION be placed in the equation:  – active ------------- --------------- - APPROX MAX CAL  – dipped where L is the length of the sensor dipped in the reference liquid and dipped is the active sensor length. active If the target liquid is available for dipping (i.e.
  • Page 106 MERICAN AGNETICS ALIBRATION PPROXIMATE ALIBRATION A value of 3.891 would be entered as the APPROX MAX CAL factor as outlined in step 10 above. The sensor is now approximately calibrated for 100" active length operation in liquid argon. 11. The sensor can now be installed in the dewar containing the target liquid. The approximate calibration can be used until an open dewar or closed dewar calibration can be performed with the target liquid.

  • Page 107: Remote Interface Reference

    Ethernet return data. The serial and Ethernet interfaces accept SCPI syntax for commands and queries. The Model 1720 provides a web browser connection (port 80) via TCP/ IP and presents a mirror of the local display which has hot spots that can be clicked or tapped, and which also accepts keyboard entry for textual and numerical input.

  • Page 108: Compatibility Support For The Ami Model 1700

    Support is provided for the command set from the AMI Model 1700. OMPATIBILITY These commands are differentiated by the command text N2. These UPPORT FOR THE commands will apply only to Channel 1 in the Model 1720. More details AMI M 1700 ODEL are provided in the detailed Command Description section beginning on page 103.
  • Page 109 : SCPI C MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND UMMARY System-Related Commands (see page 103 for more information) *IDN? *RST *TST? SERial_NUMber? DATE_MANUFacture? HardWare_VERsion? FirmWare_VERsion? Scpi_VERsion? SYStem:BEEPer:IMMediate <seconds> SYStem:BEEPer:STATe {0|1} SYStem:BEEPer:STATe? SYStem:KLOCK {0|1} SYStem:KLOCK? SYStem:DATE <yyyy>,<mm>,<dd> SYStem:DATE? SYStem:TIME <hh>,<mm>,<ss> SYStem:TIME? SYStem:REBOOT IPV4addr? MACADDR?
  • Page 110 : SCPI C MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND UMMARY Display Configuration Commands and Queries (see page 106 for more information) {CH1|CH2}:N2? DISPlay:{CH1|N2|CH2}? CONFigure:NAME:SENSor:{CH1|N2|CH2} "<string>" NAME:SENSor:{CH1|N2|CH2}? Relay Configuration Commands and Queries (see page 106 for more information) CONFigure:{RELay1|RELay2|RELay3|RELay4}:CHannel {0|1|2} {RELay1|RELay2|RELay3|RELay4}:CHannel? CONFigure:{RELay1|RELay2|RELay3|RELay4}:SETpoint <level>...
  • Page 111 : SCPI C MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND UMMARY HI/LO Configuration Commands and Queries (For Model 286 compatibility, see page 108 for more information) {CH1|CH2}:ALARm:HI <level> {CH1|CH2}:ALARm:HI? {CH1|CH2}:ALARm:LO <level> {CH1|CH2}:ALARm:LO? Measurement Commands and Queries (see page 109 for more information) MEASure:{CH1|N2|CH2}:LEVel? MEASure:{CH1|N2|CH2}:PERIod?
  • Page 112 : SCPI C MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND UMMARY Fill Control and Queries (see page 109 for more information) CONFigure:FILL:MODE {0|1|2|3} or {NORMAL|AUTOCH|PRECOOL|DISABLED} FILL:MODE? CONFigure:FILL:{CH1|CH2}:STATE {0|1|4|5} or {AUTO-OFF|AUTO-ON|M-OPEN|M-CLOSED} FILL:{CH1|CH2}:STATE? {CH1|CH2}:FILL:STATE? TOP LEVEL ALL FILL MODES CONFigure:FILL:{CH1|CH2}:A <level> CONFigure:FILL:A <level> FILL:{CH1|CH2}:A? FILL:A? TART LEVEL...
  • Page 113 : SCPI C MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND UMMARY HANGEOVER ARAMETERS CONFigure:AUTOCH:FILL:TIMEout <minutes> AUTOCH:FILL:TIMEout? CONFigure:SOURce:DEWar {0|1} or {DEWAR1|DEWAR2} SOURce:DEWar? CONFigure:CONTact:STAte1 {0|1} or {OPEN|SHUT} CONTact:STAte1? CONFigure:CONTact:STAte2 {0|1} or {OPEN|SHUT} CONTact:STAte2? CONFigure:OVErall:LIMit <minutes> OVErall:LIMit? RECOOL ARAMETERS CONFigure:PRECOOL:FILL:TIMEout <minutes> PRECOOL:FILL:TIMEout? A/B Configuration Commands and Queries (For Model 286 compatibility, see page 114 for more information) {CH1|CH2}:ALARm:A <level>...
  • Page 114 : SCPI C MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND UMMARY Channel Calibration Commands and Queries (see page 116 for more information) CONFigure:{CH1|N2|CH2}:LENgth <value> {CH1|N2|CH2}:LENgth? {CH1|CH2}:MINCAL {CH1|CH2}:MINCAL? {CH1|CH2}:MAXCAL {CH1|CH2}:MAXCAL? {CH1|CH2}:NOSENSorCAL {CH1|CH2}:NOSENSorCAL? {CH1|CH2}:APPROXMAXCAL <value> {CH1|CH2}:APPROXMAXCAL? Remote Units Commands and Queries (see page 117 for more information) CONFigure:{CH1|N2|CH2}:UNIT {0|1|2} or {PERCENT|INCH|CM} {CH1|N2|CH2}:UNIT?

  • Page 115: Configuration

    3 and receives data on pin 2. The instrument to which the Model 1720 is attached must do the opposite, i.e., transmit on pin 2 and receive on pin 3 (the requirements for a DTE, or Data Terminal Equipment device).

  • Page 116: Ethernet Configuration

    It complies with the IEEE 802.3u 100Base-TX and 802.3 10Base-T standards. The Model 1720 allows its IP address, subnet mask and gateway IP address to be assigned either statically or dynamically. To make these values static and assign them manually, set IP Address Assignment to Static (see page 65) and then set the values using the Edit parameter list.

  • Page 117: Command Reference

    All commands sent to the Model 1720 are processed and the Model 1720 responds with a return value (if applicable) and termination. If the command is invalid, the Model 1720 will respond with an error code (see the Error Codes section). All return values including error codes are terminated with <CR><LF>...
  • Page 118 MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE • FirmWare_VERsion? Returns the firmware version of the instrument, for example: 2.4.32015 Scpi_VERsion? • Returns the SCPI command version of the instrument. SYStem:BEEPer:IMMediate <seconds> • The receipt of this command with a valid argument causes an audible tone to be generated by the instrument.
  • Page 119 MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE • SYStem:TIME <hh>,<mm>,<ss> This command is used to set the instrument’s clock: <hh> Range of hours is 0 to 23 inclusive. <mm> Range of minutes is 0 to 59 inclusive. <ss> Range of seconds is 0 to 60. Do not include the <>...

  • Page 120: Display Configuration Commands And Queries

    • Returns the displayed name of the level sensor for the selected CH1 or CH2. Using N2 in the query is synonymous with CH1. The Model 1720 provides four relay contact pairs, №1, №2, №3, and ELAY ONFIGURATION №4, accessible from the rear panel AUX I/O connector (see page 134).

  • Page 121: Alarms Configuration Commands And Queries

    Returns the present status of the specified relay. A return value of “0” indicates the relay is not closed. A value of “1” indicates the relay is closed. The Model 1720 provides four software alarms. These alarms can be LARMS assigned settings that are independent of the hardware relay settings.

  • Page 122: Hi/Lo Configuration Commands And Queries

    LO has historically been to set both an alarm and relay indication when the level reaches or falls below the LO setpoint. Therefore, the following commands set both the ALARM and RELAY functions of the Model 1720 to synchronize the two according to this historical function.

  • Page 123: Measurement Commands And Queries

    Using N2 in the query is synonymous with CH1. The prefix MEASure: is optional. • CONFigure:FILL:MODE ONTROL AND {0|1|2|3} or {NORMAL|AUTOCH|PRECOOL|DISABLED} UERIES Sets the fill mode for the Model 1720. The fill modes are discussed in detail in the Operations section beginning on page 49. The argument...
  • Page 124 MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE values can be either integer or text. A value of “0” or “NORMAL” sets the fill mode function to normal, which operates Channels 1 and 2 as independent fills. A value of “1” or “AUTOCH” sets the unit to auto-changeover fill mode. A value of “2”...
  • Page 125 MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE • FILL:{CH1|CH2}:STAte? {CH1|CH2}:FILL:STAte? Either form of this command returns the present fill state of the selected channel as an integer value followed by a comma and the textual form, e.g. “1, AUTO-ON”. SCPI Fill States for Selected Channel Integer Value State Description...
  • Page 126 MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE TART EVEL FOR ODES • CONFigure:FILL:{CH1|CH2}:B <level> • CONFigure:FILL:B <level> Sets the B setpoint (control band START limit) for the selected channel in the current remote units for that channel. The B setpoint (autofill start) must be less than the A setpoint (fill stop) and must also be between 0% and 100%.
  • Page 127 MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE terminated. Setting the value of FILL to “0” disables the fill timeout function. Omitting the channel specifier applies the setting to Channel 1. {CH1|N2|CH2}:INTerval? • Returns the fill timeout setting in minutes for the specified channel. Using N2 in the query is synonymous with CH1.

  • Page 128: A/B Configuration Commands And Queries

    MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE • CONFigure:CONTact:STAte2 {0|1} or {OPEN|SHUT} Configures the empty indication state of the contact 2 sense (for DEWAR2) for either “0” or “OPEN”, or “1” or “SHUT”. Shut means the closed contact state. CONTact:STAte2? •...

  • Page 129: Assignment Commands And Queries

    MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE • {CH1|CH2}:ALARm:A? Synonymous with the query: FILL:{CH1|CH2}:A? {CH1|CH2}:ALARm:B <level> • Synonymous with the command: CONFigure:FILL:{CH1|CH2}:B <level> {CH1|CH2}:ALARm:B? • Synonymous with the query: FILL:{CH1|CH2}:B? The following commands set the channel source for each of four analog SSIGNMENT outputs (two voltage outputs and two current loops) available from the OMMANDS AND...

  • Page 130: Channel Calibration Commands And Queries

    MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE CONFigure:{CH1|N2|CH2}:LENgth <value> • HANNEL ALIBRATION OMMANDS AND Configures the sensor active length for the specified channel in the UERIES current remote units for that channel. Returns an error code if the current units are percent. Using N2 in the command is synonymous with CH1. •...

  • Page 131: Remote Units Commands And Queries

    MERICAN AGNETICS EMOTE NTERFACE EFERENCE OMMAND EFERENCE • {CH1|CH2}:APPROXMAXCAL? Returns the Approx Cal (Max) Multiplier factor (see page 89) as a decimal value. Omitting {CH1|CH2} in the command is synonymous with CH1. • CONFigure:{CH1|N2|CH2}:UNIT {0|1|2} or {PERCENT|INCH|CM} EMOTE NITS OMMANDS AND Sets the specified remote level units of measurement for the specified UERIES channel to percent (...

  • Page 132: Error Codes

    ODES • UNITs? Returns the present units for Channel 1. Since the Model 1720 optionally supports independent units setting for each channel, there is no guarantee this return value is the same for Channel 2 unless the operator is in full control of the units setting history.

  • Page 133: Legacy Command Reference

    The modern and legacy command sets can be mixed as desired. All legacy command or queries sent to the Model 1720 are applied to Channel 1 only and the Model 1720 responds with a return value (if applicable) and termination. If the command is invalid, the Model 1700 will respond with an error code (see the Error Codes section).

  • Page 134: Commands For Configuring Permanent Memory

    35.0 units of centimeters or inches. The LENGTH=<value> command will only function if CM or INCH NOTE are currently selected as the units of measurement. The LENGTH command does not configure the Model 1720 if the units of measurement are PERCENT.

  • Page 135: Querying The Configuration

    MERICAN AGNETICS EMOTE NTERFACE EFERENCE EGACY OMMAND EFERENCE The INTERVAL command sets the nitrogen fill timer in minutes as described in the Operation section on page 50. Setting the value of INTERVAL to 0 disables the fill timer function. The HI, LO, A, B, INTERVAL, LENGTH, and current remote units settings are automatically saved to permanent memory.
  • Page 136 MERICAN AGNETICS EMOTE NTERFACE EFERENCE EGACY OMMAND EFERENCE...

  • Page 137: Service And Repair

    Do not use detergent or solvents. Do not attempt internal cleaning. EPLACEABLE ARTS Replacement parts for the instrument are listed in the table below. AMI Part Number Description HG0128 Instrument foot SA 1045 Single Rack Mount Kit SA 1046...

  • Page 138: Battery Replacement

    MERICAN AGNETICS ERVICE AND EPAIR ATTERY EPLACEMENT ATTERY EPLACEMENT This section describes the procedure for replacing the battery on the instrument's main circuit board. WARNING This procedure should only be performed by a technician who is familiar with electronic instrumentation and trained in electrical safety and ESD precautions.

  • Page 139: Tools Required

    MERICAN AGNETICS ERVICE AND EPAIR ATTERY EPLACEMENT 3. From the SYSTEM CONFIGURATION screen choose SET TIME. SYSTEM CONFIGURATION Screen 4. The battery status is displayed in the SYSTEM DATE & TIME screen. If the battery is weak and should be replaced soon, the message will appear as shown at right.

  • Page 140: Fuse Replacement

    MERICAN AGNETICS ERVICE AND EPAIR EPLACEMENT 5. Using the small, flat-blade screwdriver, carefully pry the battery from the holder BH1. 6. Install the new battery into the battery holder BH1. 7. Replace the top cover and secure using the eight machine screws which were removed previously.

  • Page 141: Firmware Upgrades

    PGRADES IRMWARE PGRADES The following procedures can be utilized by users to upgrade the Model 1720 by downloading firmware upgrade archives (.tar.gz) from the AMI support website. If the local network configuration is compatible with Samba shares, the PGRADE VIA...

  • Page 142: Upgrade Via Scp

    MERICAN AGNETICS ERVICE AND EPAIR IRMWARE PGRADES 6. Open a second Windows Explorer and locate the previously downloaded firmware file: 7. Drag the firmware file to the instrument's Application Update folder in the first Explorer screen, or use the standard Windows copy/paste actions in Explorer.
  • Page 143 ./Ver-2.220719.15.tar.gz root@192.168.1.101:/update Note that you will prompted to enter the root account password to complete the file transfer. If you do not know the password, contact an Authorized AMI Technical Support Representative for assistance. 7. Install the new firmware by pressing MENU > SYSTEM > UPDATE on the instrument and choose the name of the firmware file copied to the instrument via SCP.
  • Page 144 MERICAN AGNETICS ERVICE AND EPAIR IRMWARE PGRADES...

  • Page 145: Appendix

    MERICAN AGNETICS PPENDIX PPENDIX (RS-232) ERIAL ONTACT ENSE ONNECTOR The RS-232 and Contact Sense connector is a 9-pin D-sub female connector with serial I/O and contact sense inputs interleaved. For serial applications a NULL modem adapter is not required. Serial (RS-232) and Contact Sense Pin Out Contact Sense inputs are interleaved in the connector, therefore NOTE serial and USB-to-serial cables that contain internal connections...
  • Page 146 (RS-232) MERICAN AGNETICS PPENDIX ERIAL ONTACT ENSE ONNECTOR Serial (RS-232) and Contact Sense Pin Definitions Mnemonic Function No connection Transmit Data Receive Data No connection Signal Ground and Contact Sense Return Contact Sense #1 Contact Sense #2 Contact Sense #3 No connection...

  • Page 147: Ethernet Connector

    MERICAN AGNETICS PPENDIX THERNET ONNECTOR THERNET ONNECTOR Pin 1 Ethernet Connector Socket Pin out Ethernet RJ-45 Connector Pin Definitions Mnemonic Function TXD+ Transmit differential output + TXD- Transmit differential output - RXD+ Transmit differential input + not used Transmit differential input - not used...

  • Page 148: Aux I/O Connector

    I/O C MERICAN AGNETICS PPENDIX ONNECTOR I/O C ONNECTOR The AUX I/O connector is a 15-pin high-density D-sub female connector. Aux I/O Connector Aux I/O Pin Definitions Function Polarity  # 1: 4-20 mA Loop   # 1: 0-10 VDC Output Shared common for both ...

  • Page 149: Troubleshooting

    AMI Technical Support Representative. If the cause of the problem cannot be located, contact an AMI Technical Support Representative at +1 (865) 482-1056 for assistance. The AMI Technical Support group may also be reached by e-mail at: support@americanmagnetics.com...

  • Page 150: System Test Screens

    MERICAN AGNETICS PPENDIX ROUBLESHOOTING The instrument provides various system test functions that can be YSTEM CREENS performed from the front panel touchscreen. The system test functions are not available to the web browser interface nor the SCPI remote interface over serial or Ethernet connections. To access the test functions: 1.
  • Page 151 MERICAN AGNETICS PPENDIX ROUBLESHOOTING 5. To calibrate or test the touch function of the screen, use the TOUCH SCREEN CALIBRATE or TOUCH SCREEN TEST selections in the SYSTEM TEST screen. The calibrate function will display a screen with touch targets. Touch all the targets as they are SYSTEM TEST Touch Cal/Test displayed to complete the...

  • Page 152: System Logs

    11. Use the HOME button to return CURSOR Display Selection to the main level display. The Model 1720 provides a logging feature that saves detailed YSTEM information regarding the liquid level and system events. The information can be very useful in troubleshooting suspected system errors.
  • Page 153 MERICAN AGNETICS PPENDIX ROUBLESHOOTING folder is labeled “Log files” and can found on a network by opening a file explorer at the instrument IP address or hostname. In the Log files folder, there will be a variety of logging files: N2-1.log: Contains a log of Channel 1 liquid nitrogen measurement events, with each entry timestamped and a record of the hardware bits at that time.
  • Page 154 MERICAN AGNETICS PPENDIX ROUBLESHOOTING A log entry is made when either the level changes by 0.1% or if the status bits change from last entry. Levels and bits are checked every second. A Unix timestamp is the time in seconds since Jan 1, 1970 in Coordinated Universal Time.
  • Page 155 Power Up GUI toggle Modification of a instrument variable More detailed information on each class is available from your Authorized AMI Technical Representative. Here is a simple example of operations logging file entries for a shutdown initiation: timestamp, class,data1,data2,data3 #1 1626712173,LL,MENU,menu.aml, #2 1626712191,LL,SHUTDOWN,../shutdown.aml,...
  • Page 156 MERICAN AGNETICS PPENDIX ROUBLESHOOTING The class LL indicates that this was a link label button event, that is, the label on the button was MENU, and that the linked page loaded was menu.aml. 1626712191,LL,SHUTDOWN,../shutdown.aml, The operator pressed the SHUTDOWN menu button which then loaded the ../shutdown.aml page.
  • Page 157 MERICAN AGNETICS LOSSARY LOSSARY BBREVIATIONS AND CRONYMS Term Meaning AC; ac Alternating Current; strictly, electrical current that periodically reverses direction. Typically used also to describe an electrical power source in terms of the voltage. For example, 240 VAC. ASCII American Standard Code for Information Interchange; numerical representation of characters such as 'a' or '@' or an action (such as line-feed);...
  • Page 158 MERICAN AGNETICS LOSSARY BBREVIATIONS AND CRONYMS Term Meaning i, I Electrical current flow International Electrotechnical Commission IEEE Institute of Electrical and Electronics Engineers Input/Output; The hardware and associated protocol that implement communication between information processing systems and/or devices. Inputs are the signals or data received by the system or device, and outputs are the signals or data sent from Internet Protocol;...
  • Page 159 52 configure source and level 45 indication and acknowledgement 46 AUTO-OFF multiple 45 AUTO-ON muting 44 states 46 AMI contacts battery backup analog outputs connection 29 battery replacement connector 134 current loop diagram 30 current loop output 29...
  • Page 160 101 open dewar calibration 82 – connectors sensor length 79 RJ-45 - see Ethernet sensor name 80 contact AMI shorted condition 135 top vent hole 16 cryogenic liquids viii vent holes 74 first aid, first aid ix choosing units...
  • Page 161 MERICAN AGNETICS NDEX Ethernet connector pin out level damping level units fill timeout for LN2 liquid level system terminology disable 51 reset 52 logging footer loss of sensor editing 33 autofill 22 home screen 32 LN2 troubleshooting 135 front panel layout power switch 31 fuse replacement M-CLOSED...
  • Page 162 MERICAN AGNETICS NDEX description 12 parameters 101 installation 19 RS-232 connector RS-232 setup open dewar calibration – operation warnings safety cryogenic liquids viii equipment x legend x power on/off relief valve 20 power requirements warnings xi power supply screen descriptions operating parameters 9 DAMPING 35 HISTORY 42...
  • Page 163 MERICAN AGNETICS NDEX weight function 67 setup 66 termination 67 serial port connector/cables service AMI contact 135 service - see instrument set-var shutdown specifications analog output 9 autofill 10 display 9 environmental limits 11 level measurements 9 physical 10 power 10...
  • Page 164 MERICAN AGNETICS NDEX...

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