Liquid Helium Level Instruments Liquid Helium Level Instruments
Contents
1. a a lt 7 z i 3 2 r 2 ee a s F Su A a g eo m aa American Magnetics Inc Excellence in Magnetics and Cryogenics Model G35 tiquia Helium Level Monitor Sample and Hold Level Sensing ER Aguas J 7a Eerd PE Pare J pare Moder i A e j l ri a The AMI family of liquid helium level instruments offer a wide range of solutions All instruments pass a constant current through a superconducting Niobium Titanium N bT i filament and measure the resistance T he portion of the filament in liquid helium becomes superconducting i e no resistance T he resulting resistance of the wire above the liquid is converted to a level signal Advanced circuit designs offer our customers many advantages Years of trouble free service are the result of rugged construction both inside and out All our instruments and sensors from 1 to 36 are stock items for quick delivery Our experienced staff offer prompt repair service when needed OEM instrument design and manufacturing partnerships are always welcomed if our standard products do not meet your needs The Model 135 incorporates all of the features described below N ot all sample and hold monitors are alike AM I s patented circuit design U S Patent No 3 943 767 energizes the level sensor for the minimum amount of time required to obtain an accurate reading and automatically adjusts2. level control setpoints and liquid helium level sensor into the lower 22 inches sampling interval Computer interface options are supplied of the supply side transfer leg T his allows the user with free virtual instrument V1 drivers for N ational to monitor the decreasing helium level in the supply Instruments LabVIEW software for Windows version 3 1 dewar and stop the transfer before hot gas is blown and above Use of the RS 232 or IEEE 488 interface options into the target dewar Any AM I liquid helium level do not require LabVIEW The LabVIEW drivers can be instrument can be used to monitor the level via the completely customized by the user signal cable attached to a 4 pin electrical connector on the transfer line The transfer line is vacuum Made 1K vie SPU jacketed with superinsulation 60 inch dewar legs a Ee epe P ee 60 inch flexible section and is designed such that the EE sensor is field replaceable Items included Integrated e User Manual Level Sensor e Detachable vacuum evacuation valve e Signal cable with mating connectors For over 25 years American M agnetics Inc has been a leading supplier of liquid helium level instruments and sensors In addition a complete line of instruments and sensors is offered for other cryogenic gases O ur instruments are used worldwide by thousands of users in a wide array of applications Some of the applications include Magnetics Resonance Imaging Systems Scientific La
3. boratories University Physics D epartments Industrial Gas Producers and D istributors AM I s liquid helium level instrumentation is based upon measuring the resistance in a N b Ti superconducting filament External communications and control options include 0 10 Volt recorder output 4 20 mA output and RS 232 or IEEE 488 AM I s affordable line of cryogenic level instruments are designed for maximum flexibility and years of trouble free service Custom products and system solutions can be designed for your specific needs O ur worldwide network of sales engineers provide local service For further information please call or visit our World Wide Web site American Magnetics Inc 4 Excellence in Magnetics and Cryogenics P O Box 2509 e 112 Flint Road Oak Ridge TN 37831 2509 Phone 423 482 1056 Fax 423 482 5472 E mail sales amencanmagnetics com Visit AMI on the Web at http www americanmagnetics com
4. e available upon request metallic sleeves custom connectors etc Miodel GOA tiguic Helium Level Meter Economic Level Sensing This rugged economical design is a classic With a quick flip of the switch a user can easily determine the level of liquid helium in their dewar A large analog display clearly shows the level from 0 100 and is easily read from a distance The M odel 110A can be used with any AM I liquid helium level sensor up to 60 and comes with a standard 0 10 V recorder output on the rear pand Items included Available options e User Manual e Rack mounting e Sensor Input mating connector e IEC 320 power cord Portable Solutions Miocde l 150A Portable Liquid Helium Level Meter The Moda 150A is ideal for use with helium storage dewars on loading docks in storage rooms 7 i or in remote locations were line power is unavailable T his meter works with any AM I 4 wire helium sensor up to 60 inches active sensing length T he hand held meter has a 3 5 digit LCD readout and an accuracy of 0 5 Power is provided by a sealed lead acid battery pack The battery can be charged to 70 capacity within 5 hours A fully charged battery is good for hundreds of readings and can be stored for up to one year at room temperature before recharging is needed Items included e User Manual e Battery charger e Sensor input cable with mating connector e Sealed lead acid battery The M odel 160 is designed for measuring the l
5. elay normally open 10 VA normally open 10 VA Contact Ratin 5A max current 5A max current Controller Output An i eT oR Signal 0 10 V standard 0 10 V or 4 20 mA 0 10 V or 4 20 mA Options 0 100 mV optional ooo Xx G 4 x 10 75 epeuxo 4 x 10 75 peou oe x 10 75 standard standard standard Sax LS x 10 75 Sroa b9 x 10 75 Bo x 19 x 10 75 rack mount rack mount rack mount los standard 4 0 lbs standard 4 3 5 O lbs rack mount los standard 4 4 7 los rack mount 5 3 O lbs rack mount 15 50 C non condensing 15 50 C non condensing 15 50 C non condensing Portable Liquid Helium Level Devices LevelMeter Model Point Sensing Dipstick Level Range a 72 extension 0 1 point sensor M 6 25 H x 3 13 W x 2 25 D 1 5 H x 2 5 W x 4 25 D Liquid Helium Level Sensors Active a al Sensor Lengths Dent ee urrent Resistance Diameters G 10 Stick 1 80 active 1 6 standard 75 mA 11 4 Q in 20K 3 16 13 3 Q in 300K 1 4 standard 3 8 ronnie 1 80 active 2 6 standard 75 mA 11 4 Q in 20K 5 16 13 3 Q in 300K Tale 1 80 active 1 6 standard 75 mA 11 4 Q in 20K 3 32 Flexible 13 3 Q in 300K Liquid Helium Transfer Line Digital Computer Interface with Built In Level Sensor The computer interface options allow computer monitoring E Eas and control of the liquid level sensor length calibration This innovative design incorporates a standard AM high low alarm setpoints
6. evel of liquid helium in storage dewars A superconducting point sensor is mounted on the end of a 72 Inch x 1 4 inch phenolic extension tube The user can choose two modes of operation to detect the liquid level In the liquid detect mode the sensor is lowered into the dewar and an audible alarm and LED will energize when contact is made with the liquid In the gas detect mode the dipstick can be fixed at a predetermined level in the liquid helium W hen the sensor becomes exposed to the gas the alarms will be energized T he M ode 160 is powered by one standard 9 volt battery T his device offers highly accurate level determination and is an excellent alternative to unreliable flutter tubes or carbon resistor devices Miode l 160 Liquid Helium Point Sensing aN Items included e User Manual e 72 x 1 4 extension tube with point sensor e 9 volt battery e 6 feet of cable and mating connector ry Spec ifications Liquid Helium Level Meters and Monitors Level Range 0 60 inches 0 80 inches 0 80 inches Display Type analog meter 3 5 digit LED 3 5 digit LED Electronic Display 2 of full scale 0 1 of active sensor length 0 1 of active sensor length 115 230 or 100 200 VAC 115 230 or 100 200 VAC 115 230 or 100 200 VAC 10 50 60Hz 10 50 60Hz 10 50 60Hz Readout Units J only inches orcm Sample Interval a N A 0 600 minutes or hours 0 600 minutes or hours Alarms audible LED audible LED Input Power Alarm R
7. for any level sensor length unlike other designs which energize the sensor for a fixed time interval T his ensures the least possible heat transfer to the liquid helium High Low alarm setpoints activate front pane LED warning indicators audible alarms and rear pand relay contacts T he audible alarms can be silenced from the front panel The High Low triggers are set by the user from the front panel from 0 100 of the leve sensor active length Internal relay contacts are normally open and accessed from the rear panel connector M icroprocessor based electronics are accurate to within 0 5 or better of the sensor active length Watchdog timer circuitry and low line voltage brownout detector prevent microprocessor lock up and provide fail safe operation T he use of 4 wire level sensors ensures accuracy by eliminating differing lead wire resistance that can be seen as a false signal on 3 wire devices Can be used with liquid helium level sensors up to 80 inches Selectable continuous measurement or sample and hold modes with sample update switch Fully adjustable sample intervals from 0 600 minutes or hours The user can set sample interval from the front pane without the use of D IP switch settings Level sensor burn out protection detects excessive sensor resistance and de energizes the sensor current before burnout can occur Burn outs can occur when a level reading Is attempted in a vacuum environment without l
8. iquid helium on the sensor to dissipate the heat Items included e User Manual e Sensor input mating connector e IEC 320 power cord e Monitors are easily reconfigured for different sensor lengths from the front panel Ultrafast circuit takes multiple samples each second in the continuous mode and updates the display every 200 milliseconds EEPROM maintains monitor calibration without the need of battery backup AM I level monitors use Internal power supplies and standard removable IEC 320 computer line cords T his makes moving and Keeping up with your instrument easy Rugged metal chassis design can withstand years of abuse T he deicing dirty sensor feature gives the user an option to increase the sensor current for a short time at the beginning of each sample T his feature is sometimes useful for removing ice or other deposits from a sensor that may cause false readings A floating sensor power supply provides safe operation by eliminating the possibility of a ground path between the sensor and dewar Rack mount kit easily converts table top monitors to single or side by side 19 x 3 5 EIA mounting T his option is supplied on the original monitor or can be field installed at a later date Available options Computer interface RS 232C or IEEE 488 e Outputs 0 10 Vdc or 4 2 OmA current loop e Rack mounting Miodel 136 Liquid Helium Level Controller Sample and Hold Level Sensing Automated level control fu
9. nctions The M odel 136 incorporates all of the features of the M ode 135 plus an added level control function The M odel 136 controller is designed for use in unattended liquid helium level ut eaa control systems Two independent setpoints A and B are set i ee by the user from the front panel from 0 100 of the level eel sensor active length W hen the liquid helium level drops to the B setpoint the rear panel power receptacle is energized until the liquid helium level reaches the A setpoint The controller output voltage is the same as the input AC line voltage AM offers a full line of 4 wire liquid helium level sensors that are rugged and offer low liquid helium consumption Standard and custom designs are available Standard AM sensors are constructed of 1 4 G 10 phenolic tubing with optional sizes of 3 16 3 8 and 1 2 available Flexible sensors of 5 16 diameter tubing are standard items for applications where the sensor must DP conform to the curvature of a horizontal axis dewar such exible ana o as M R systems Standard lead wires are 28 AWG Teflon oo insulated copper wire Standard sensor lead wire length is oo 6 inches with longer lengths and lead wire types available upon request 1 2 in 1 2 in Active length BOTTOM NEXT DAY SENSOR SHIPMENTS AMI stocks 1 4 OD rigid sensors in active lengths from 1 to 36 in increments of 1 Custom sensors ar
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