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From: Tim D'Adam

Hi Mike,
I was wondering if you might be able to provide me with some options for the measurement of cryogenic fluids using ultrasonic transducers?

To provide you with some background on the application I have included a sketch which provides the basic properties of the system. The idea is to take periodic point measurements every 10-15 minutes of the helium-4 superfluid level with an accuracy of ~2 mm if possible. The sensor can be mounted at the base or top of the chamber or alternatively be suspended in the gas flow if necessary. The use of multiple sensors arranged vertically to detect immersion is also a possibility.

As noted in the diagram the sensor must be capable of functioning at temperatures as low as 1.3 Kelvin, survive thermal cycling to/from 300 K and be vacuum compatible.

I look forward to hearing from you.

Kind regards,
Tim D'Adam

Services for Advanced Neutron Environment
Institut Max von Laue - Paul Langevin (ILL)
71, avenue des Martyrs - CS 20156
38042 Grenoble cedex 9 - France
+33 (0)4 76 20 72 58

From: Joe Stevik

Dear Mr. Coope,

I hope you don’t mind this very out-of-the-blue email, but I came across your site as I was looking for resources to help me determine whether a particular metal alloy (zirconium based bulk metallic glass) would be appropriate as a sensor diaphragm material. Your site contained some wonderful information about sensors, but I was wondering if you might know of any laboratories, individuals, or groups that specialize in materials research targeting the sensor industry.

I apologize if this information is already on your website somewhere, but the closest match I could find was a group called “Invasens”, and it wasn’t clear whether they would be interested in qualifying new alloys for sensor applications.

If you are able to point me toward someone who might be interested in this kind of work, I would be greatly appreciative. I believe there may be a future for this material in sensor applications, but would love to measure some raw data to show that there is a reason to pursue the application further.

Thanks very much for your time!


Joseph W. Stevick, PhD - Principal Scientist
Liquidmetal Technologies, 20321 Valencia Circle, Lake Forest, CA 92630
Ph: 949.635.2105 Email:

From: Stephen Need


I have two applications for use in industrial research.

First I would like to map the pressure distribution on impeller blade in a stir tank. I would like to mouth the sensors on the blades then coat it in polyurethane. Additionally I would like to measure the vibrations along the shaft connected to the impeller.

Second I would I like to map the pressure distribution inside of a ball mill.

I was think of using tactile sensors for the pressure mapping. If your could help me with choosing the required sensors and a quote for these applications I would be very thankful.



From: Jim Shontz

I am a development engineer for Whirlpool Appliances and I have a situation I need to address involving some small electric motors. I need to be able to measure the gap between the rotor and the stator of the motor while it is going down the assembly line to final test. If the gap is to small, less than 0.005, I need the motor pulled off the line.
Are you aware of any technology or supplier that can help supply this type of measurement?


Jim Shontz

From: Jean Bousin

I am Jean of Soytouch, my company in south of France is working in grains storaging.

We start a first automatisation of our process and we require partners for long terms to buy our sensor and equipments.

PLEASE : If you dont sell this sensors but an other type ==> send your catalogue of sensors and others equipements for our futures projects

This first project is named : GLS (grain levels sensors )

This project is to see on a screen the level of grain in 5 tanks of grain. sensor transmit to plc, plc to screen the level of grain. Localisation of each components aerien map :

Requirements :
5 sensors, working 4-20mA although the software for sensors with RS485 will be fasted wire to connect all adaptors to connect to plc
plc screen
a good price and very good quality.
Sensors infos :
yes, the most important is to do according environnement of sensor.
- in tank of grains of 50 tons
- in temperature from -10 °c to 40° c,
- resistant of strong humidity ( rain , water condensation )
- very strong dust environment
- level of beans in tank is not flat but pyramidal to the top ( when we fill the tank) to the bottom when we are emptying the tank.
- density of grains is 0,70 %
-humidity of grains is 12%
- a good mix between good price and good quality would be perfect :-)
- a technology that your team know correctly would be the best, to make sure of any surprise.
- long distance to cover between sensors and plc + 200 meters ( counting the cable detours, not in a straight line)

PLEASE : send price offer for requirements (including price until france TOULOUSE)+ time to get it after order + if in stock + sheet specifications of each products . Also please send your catalogue of sensors and others equipments for our futures projects.

PS : if you have sensor 4-20mA & RS485 please send 2 differents price

merci beaucoup !

Jean Bousin - Business Relations
Les Silos du Touch SARL
att Jean Bousin, Route de Bérat,
31430 Pouy de Touges, France

Skype : Soy'touch Soy'touch
Phone : +33 650 072 139
Tel : +33 561 870 578
Fax : +33 561 938 791

From: Carrick Hill

Hi I’m trying to find a sensor to pick up the presence of a metallic (stainless steel) slug that is a link on a travelling axis (chain) that is primarily made from PE based fiber rope always under tension. The rope is normally dry but sometimes wet during sailing at sea. The rope travels on a constant axis location and orientation between points but the no symmetric slug can rotate on its own axis preventing a constant sensing distance.

The difficulty with am inductance sensor type solution is that the slug is not symmetric about its axis (and cant made so for structural reasons) so the sensing distance can vary anywhere from 3mm to 30mm depending on its rotation and travelled position (that is not controllable and so random). ie if constant (from symmetry) the sensing distance could be tuned and more reliable sensing.

The system is housed in a tight fitting alloy box with plenty of locations/space for ideally mounting on CL

Hope that makes sense.

Carrick Hill
Research and Dev
Southern Spars NZ

From: Jim

Greetings Mike,

I am a junior high science/health teacher passionate about developing the next generation of critical thinkers, innovators, and problem solvers. We are working on a sensor project where the students would like to design, measure/test and optimize ( a sensor that fits into a metal pipe or attached ) the velocity of impact on a pipe and see the results/rate of collision in real time, possible Tri-axial data points and in kilometer per/hour, then collecting all data on the effects of high-speed collisions and transmit wirelessly. This dynamic behavior of the (ball or ?) hitting/bouncing off a stationary pipe (or other metal surface).

I was wondering which effective tools existed to conduct fundamental force measurements of extreme (collision) events in targeted energy transfer in mechanical systems such as (impacts and responses).

Question, not sure what are the best (methods) force sensor, accelerometers/sensors to measure and the best way to simulate this project with a wireless component feature. Also, could this be compared to crash testing a vehicle. These are the items/subject matter the class is researching on the computer for help with this project. We sincerely appreciate any/all technical assistance (through email communication).

mechanical pressures, shock/vibration product
placing/installing accelerometers or ?? in pipe
power sources - including voltage
3-axis sensing data
plug-n-play would be great
high sensitivity ISM Datum wireless network, enables long distance
network wireless sports and hardwired sensors, data acquisition Logic/relay interface, large data displays
A unique embedded 32 bit identification code

The students and I want to deeply thank you for your advice and efforts to propel our project forward as each of them strive to reach their accolades in the STEM program.

Best wishes and continued success in all your future endeavors!
Jim Bischofberger (Class #8)

From: Hasan Abadi

Dear sir/madam
I have instaled a PT100 sensor (3 wire type) in a water pump tank and it is connected to its relay. It should have 100 ohm resistace brtween one wire and the other wires and the other 2 wires shoukd be short circuit.
But all the three wires are short circuit .
Can you explain me the problem and solution way?
Thank you so much


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