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From: Neil Maness

I am looking for a sensor to non-contact detect the presence of 60 Hz AC voltage in a jacketed wire.
The application is to detect the presence or absence of voltage on the Mains of a generator/utility transfer switch into a facility. I need a sensor that I can permanently fasten externally to the conductor jacket and not need to touch the high voltage conductor. Line voltages range from 115 vac to 480 vac. The sensor will be connected to a SCADA monitoring system DC input point to tell the Owner when utility power is present or that the facility is being powered from the generator. Most sensors try to eliminate the 60 Hz as noise but that is the property I am trying to detect.


Neil Maness
Tel: 501-520-7242

From: Roger Scharf

I need a sensor to identify the locations of different points of impact on a metal plate. I envision a film sensor attached or glued to the back surface of a metal face plate. The face plate would be impacted by a round object at about 2000 to 4000 psi creating a temporary bend or deflected spot of about 1/4 to 3/8” diameter. The sensor on the back face of the metal plate would detect the temporary deflection spot and impose it’s location on a pre-programmed mapping templet. This information would be sent wireless to a cell phone where it could be viewed on a similar mapping templet.
The impacts would be singular events, but would be repeatable many, many times over the life of the product.
The sensor would have to meet outdoor environmental conditions, although it would be permanently enclosed.
The face metal plate would be about 8 square inches in area and about 1/16” thick.
There would be space in the enclosed area for small battery and other necessary small hardware capable of vibration if required.
I am very interested in a referral to a company that has or can produce a sensor as above.
I would also entertain a “freelance” project or a equity position participation.
Please contact me at:

Roger Scharf
Ph: 1-904-874-9080
Florida, USA 33417

From:Steve Staiano

Hello, I am trying to measure the gap between a .085 rod face to a tapered circular wedge in a small assembly. We are trying to monitor/measure the smallest gap between the 2 components. The range we need to measure is .004 +/-.002.

Is there a touchless/non touchless instrument that can measure this gap ?


Steve Staiano
Parker FSD
Smithtown NY

From: David Jenkin

I have an application for a vibration sensor mounted on a 9.0m dia. Drilling machine. This sensor is to detect any vibration as result of the drill bit rotating between 1 and 5 RPM. The total rotating mass is 250 Te.

The idea is to use the vibration levels to control the rotation parameters and the force imported to the drill bit face.

This process is called ‘collaring’ the hole. This control has to be maintained until the drill bit has been stabilised at sufficient depth to support the drill bit.

I believe a secondary sensor mounted on the rig frame will measure the background vibration so that the true oscillation of the drilling operation can be assessed.

I admit my experience with vibration or accelerometer sensors is basic, so any help I can get a.s.a.p. will be greatly appreciated.

The control system works on 24v dc and 0 -20 mAmp. Please contact me at my office e-mail address


Lead Design Engineer - Fluids & Control

From: Mehmet AKBULUT


I am writing you in regards to infrared temperature measurement sensor.
Our inquiry is about the products as listed below:

* Temperature range between 0 – 100 °C. Or, anything closer

* Output 0 – 10 V or 0 – 5

* USB Programming interface

* Power supply: 5-30 V DC

I would appreciate if you could advice product/products similar to the above specifications.
In addition to that, please include the stock availability as we need more quantity.

Looking forward to your reply,

Best Regards,

Mehmet AKBULUT - Director / Industrial Engineer
Address: Str. Han Presiyan No:11, 4003 Plovdiv / Bulgaria
Tel: +359 32 207 234 - Mobile: +359 879 339 903

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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