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American Magnetics, Inc.
P.O. Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509
Phone: (865) 482-1056
Internet: http://www.americanmagnetics.com E-mail: sales@americanmagnetics.com
INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS
I.
INTRODUCTION
The AMI Model 15l is designed to operate with an AMI liquid helium (LHe) level sensor
up to 60 inch (152.4 cm) in length for 4.2K operation only.
The Model 151 includes an optional 0-100 mV input from an external source for
displaying a corresponding 0-100% LHe level.
The Model 151 also includes a optional gauge pressure port for 0-5 psig display.
The Model 151 includes a replaceable COTS lithium battery pack with an external
charge port. Battery status is conveniently displayed to the nearest 10% of remaining
capacity.
The display is an e-ink style which maintains the last measurement display after the
power is removed.
Present LHe
LEVEL
Pressure Port
Value
A USB connector is provided that functions as a Virtual COM Port (VCP) when
connected to a computer. The USB interface is interactive in a standard serial terminal
emulating app. USB features include the ability to perform user calibrations for sensor
lengths other than the default 60 inches, calibrate the digital voltmeter input, and set
the local time.
EXCELLENCE IN MAGNETICS AND CRYOGENICS
Fax: (865) 482-5472
AMI MODEL 151
LIQUID HELIUM LEVEL METER
L H e L E V E L ( % )
80.0
P R E S S U R E 3 . 5 P S I G
2 4 A P R 2 0 2 3
Rev. 6, 17 Mar 2025
I N P U T :
L H e S e n s o r
B AT T E R Y :
7 0 %
1 5 : 3 0
Active INPUT
Selection
BATTERY
Status
Date/Time of
Last Reading
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Table of Contents
Related Manuals for American Magnetics 151
Summary of Contents for American Magnetics 151
- Page 1 The AMI Model 15l is designed to operate with an AMI liquid helium (LHe) level sensor up to 60 inch (152.4 cm) in length for 4.2K operation only. The Model 151 includes an optional 0-100 mV input from an external source for displaying a corresponding 0-100% LHe level.
-
Page 2: Specification
II. SPECIFICATIONS Specification Value Sensor Input Connector Female DB-9 Compatible Sensor Type AMI LHe level sensor Minimum Compatible Active Length ) (inches) Maximum LHe Temperature (K) Sensor Nominal Excitation Current (mA) Sensor Nominal Maximum Voltage (V) Sensor Linearity 0.5% of full scale Sensor Absolute Calibration 2% of full scale (from 0 to 50ºC) -
Page 3: Installation
III. INSTALLATION A. With the Model 151 powered OFF (i.e. the READ LEVEL button is not lit), and if using with an AMI LHe level sensor, connect the sensor male DB9-pin connector to the LHe LEVEL SENSOR connector on the face of the Model 151. -
Page 4: Operation
100mV INPUT on the face of the Model 151. NOTE: If the 0-100mV source is <10mV, the Model 151 will display “<10.0” as the percent level reading. If the mV source is rapidly changing, the unit may display “. . .”... -
Page 5: Usb Interface
CHARGED if the CHARGE port is properly connected to external power. The Model 151 can be operated with the CHARGE port connected, or disconnected with adequate remaining battery capacity. CAUTION: Only use the 19VDC, 60W charger provided with the Model 151 with the CHARGE port. USB INTERFACE A. -
Page 6: Troubleshooting
supported, therefore using UTC is suggested. An example session for setting the RTC is shown in the graphic on the following page. Setting the Real Time Clock (RTC) example G. Use the j Read EEPROM function (enter 2 to show page 2 for more options) to perform a persistent memory integrity check and display of the stored values. -
Page 7: Maintenance
If the cause of the problem cannot be located please call an AMI technical support representative at +1 (865) 482-1056 or support@americanmagnetics.com. VII. MAINTENANCE The Model 151 prototype requires no maintenance other than periodic recharging of the internal lithium battery pack. VIII.WARRANTY...
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