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  Volume 3 - Issue 16 - 8/25/03
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Connect To These Topics In This Issue:

 

   Spotlight On...
   – Endress+Hauser
   – Micro-Epsilon
  GlobalSpec Announces
   Partnership with Test &
   Measurement World
  Battery Holders
  Industrial Chillers
  Pressure Relief Valves
  Solar Radiation
   Instruments
  Stepper Motor Drives
  Thermistors

  Comtrol Corporation
  Technical Library Spotlight:
   "Improving Security with
   Identification Printing"
  Take A Break With "The
   Challenge"
  Dillon Force Measurement
  ITT Industries / FLOJET
  New Product Categories
   on GlobalSpec
  New Supplier Catalogs
   on GlobalSpec
  GlobalSpec Links


GlobalSpec
– the world's largest database
of technical products and services!

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Spotlight On...

E-Direct On-Line StoreNew E-Direct On-Line Store is Open

E-Direct is a new online shop from Endress+Hauser where low-cost measurement and component products can be purchased. E-Direct products include components like power supplies and displays, pH electrodes, temperature and pressure transmitters and a variety of level switches for use in liquids or solids.

A unique 30-day trial program lets you try a product and see the quality for yourself. Try one, then buy all the devices you need from E-Direct.

Click here to browse our online catalog or learn more about Endress+Hauser here.

EDDY CURRENT DISPLACEMENT SENSORS
NCDT 3700
EXTREME RESOLUTION - LOW COST

eddyNCDT 3700The eddyNCDT 3700 (eddy current non-contact displacement transducers) from Micro-Epsilon is intended for use in production systems for machine monitoring as a customized system for OEM applications, particularly when extreme resolution is demanded. Positioning and closed-loop control tasks are solved with the highest precision. Measurement results down to 0.08 nanometers have been established with this system. Specifications:

  • Measuring principle: eddy current
  • Measuring ranges: 0.5/1/3/6 mm
  • Resolution: 0.000008 % FSO
  • Repeatability: < 0.001 % FSO
  • Frequency response: 10 kHz (-3 dB)
  • Temperature range of sensors: -50 to +150 °C
    and -60 to 300 °F

Click here to browse Micro-Epsilon's online catalog or contact them via e-mail for more information.

GlobalSpec Announces Partnership with Test & Measurement World

GlobalSpec and Test & Measurement World have teamed together to offer Test & Measurement World Online's readership access to the world's largest searchable database for technical products and services – SpecSearch® by GlobalSpec. SpecSearch at www.tmworld.com provides direct access to GlobalSpec's online searchable database. So save yourself a few steps – simply click on the "SpecSearch by GlobalSpec" button and you will be connected to a Product Finder page where you can begin to search for a product or service.

Click here to read the press release, issued in July.

Looking for Battery Holders, Industrial Chillers, Pressure Relief Valves, Solar Radiation Instruments, Stepper Motor Drives or Thermistors?

Find them on GlobalSpec!

  Battery Holders

Battery holders are designed to support commercial, industrial or OEM batteries. They allow for safe retention, and easy and fast replacement of the battery. You will find contact information for 33 manufacturers in this category.
Click here to search for Battery Holders by Spec.

  Industrial Chillers

Industrial chillers use refrigeration to cool water that is then pumped through process or laboratory equipment. Industrial chillers are used in the controlled cooling of plastics during fabrication, manufacturing elements such as printer rollers, and high-heat specialized items such as MRI machines and lasers. Industrial chillers typically come as complete packaged closed-loop systems, including the chiller unit, condenser, and pump station with recirculating pump, expansion tank, no-flow shutdown, and temperature control. Closed loop chillers recirculate a clean coolant at a constant temperature and pressure to increase the stability and reproducibility of water-cooled machines and instruments. You will find contact information for 149 manufacturers in this category.
Click here to search for Industrial Chillers by Spec.

  Pressure Relief Valves

Pressure relief valves are designed to provide protection from over-pressure in steam, gas, air and liquid lines. Relief valves and back pressure regulators are the same device, only differing in application. The pressure relief valve "lets off steam" when safe pressures are exceeded, then closes again when pressure drops to a preset level. A back pressure regulator maintains upstream pressure at the desired setting by opening to allow excess upstream pressure to flow downstream. You will find contact information for 218 manufacturers in this category.
Click here to search for Pressure Relief Valves by Spec.


  Solar Radiation Instruments

Solar radiation instruments are used for the measurement of the spectral range of radiation. The most common types of these instruments are pyranometers, which measure global solar radiation (sun + sky), or daylight radiation; radiometers, which measure the net radiation level, or the sum of the incoming direct beam and diffuse solar radiation minus reflected solar radiation; and a quantum sensor, which measures the photosynthetic light spectrum or Photosynthetic Photon Flux Density (PPFD), the number of photons incident per unit type on a unit surface. You will find contact information for 13 manufacturers in this category.
Click here to search for Solar Radiation Instruments by Spec.


  Stepper Motor Drives

A stepper motor drive acts as an interface between a controller and the motor. The drive must match the control signals (voltage and power levels) and signal type (analog or digital). The drive produces power conversion, amplification, and sequencing of waveform signals. You will find contact information for 64 manufacturers in this category.
Click here to search for Stepper Motor Drives by Spec.

  Thermistors

Thermistor elements are the most sensitive temperature sensors available. The base element is composed of metal oxide ceramics, and is relatively low cost. Thermistor elements are also the most nonlinear temperature sensors, and have a negative temperature coefficient. Often, two thermistors are combined to provide a more linear output. You will find contact information for 101 manufacturers in this category.
Click here to search for Thermistors by Spec.

Comtrol Corporation

Universal PCI Multiport CardsAttach Up to 32 Serial Devices With New Universal PCI Multiport Cards from Comtrol Corporation!

  • NEW! RocketPort Universal PCI Cards – deliver 4, 8, 16, or 32 RS-232/422 serial ports and the quality and performance you've come to expect from Comtrol, plus compatibility with PCs using 3.3 volt PCI slots*.

  • RocketPort LOW-PROFILE Universal PCI 8-Port – the industry's FIRST high-density low-profile PCI serial expansion card for the new slimline PCs delivers a half-height design and supports 3.3 volt power requirements*.

    * Compatible with 64-bit 66MHz 3.3 volt slots.

Click here to learn more about Comtrol's RocketPort Universal PCI multiport cards.

Browse Comtrol's online catalog by clicking here, or contact them via e-mail for more information.

Technical Library Spotlight: "Improving Security with Identification Printing"

"Organizations continually face new security threats. And whenever the economy slows, crime becomes a growth industry. Commercial crime is an age-old problem, but organizations continually face new fraud and theft risks. As the improving quality of computers, printers and copiers generates new threats, businesses must find new deterrents to protect themselves.

Identification printing solutions can be a powerful deterrent to various security concerns faced by all types of businesses. Bar code and radio frequency identification (RFID) technologies have proven to be extremely effective for access control and employee time keeping. This white paper will explain how to improve security with identification printing solutions, featuring bar code, radio frequency identification, graphics, logos, digitized photos and text. It will specifically address applications for protecting people, products and property, including:

  • Access control, visitor tracking and personal security
  • Asset and equipment protection
  • Product protection
  • Document and ticket security
  • Evidence management and other law enforcement applications

The paper will also provide an overview of identification printing technologies and present several real-world examples of how companies and law enforcement agencies have benefited from ID card and label printing technology."

Continue reading "Improving Security with Identification Printing" by clicking here.

This application white paper was submitted by Zebra Technologies and is listed in the Packaging and Labeling section of GlobalSpec's Technical Library.

The Challenge - The Beer Is Freezing...

The situation presented in the last edition of the newsletter was: It's a hot afternoon, you've just finished mowing the lawn and are in need of a nice, cold beer. Prior to starting your yard work, you put the beer in the freezer so it would be very cold - and refreshing - when you were ready to drink it. You take the beer from the freezer and it is indeed very cold (but not frozen). But before drinking it, you add a little lime juice. All of a sudden, ice crystals form and work their way down through the beer. What happened?

Answer: The beer you've taken out of the freezer is supercooled – it has been brought below its freezing point but hasn't actually frozen. Supercooled liquids are usually very unstable and can often be induced to solidify by a slight mechanical disturbance. Opening the beer and adding the lime juice is the disturbance that causes the ice crystals to form. (Actually, just opening it can disturb its metastable state.)

Here are some of your thoughts on this subject. (We received quite an assortment of answers!)

"The beer was supercooled and the lime juice has a lower freezing point than water. The supercooled water absorbed enough heat from the lime juice to cause it to freeze and the resulting ice formed a seed for the water in the beer. Once supercooled water has an ice seed, the whole thing solidifies. Water can be cooled below its freezing point without forming ice if it has no ready seed. We used to supercool distilled water in clean, new glassware and it would all suddenly freeze if the glassware was tapped with a pencil."

"I think it's called seeding (liquid-to-solid nucleation) of a supercooled solution."

"For the chilled beer problem, it appears that the beer has been supercooled. Before adding the lime juice, the solution is happy with its state. Adding the lime juice gives a site for crystallization to begin, which then spreads throughout the solution. I find that a shock to the bottle (tap it on the counter) can also induce the crystallization. There is a barrier energy that must be overcome in freezing a liquid, which is what permits supercooled solutions to stay liquid. The model for this was proposed in the 50s (I think), and just recently confirmed."

"The alcohol in the beer lowers its freezing point, so the beer can remain in a liquid state below 0 degrees C. If the freezing point of the lime juice is higher than the temperature of the beer, then some of the juice may freeze and form ice crystals before it can be dispersed into the bulk of the liquid."

"For the chilled beer problem, it appears that the beer has been supercooled. Before adding the lime juice, the solution is happy with its state. Adding the lime juice gives a site for crystallization to begin, which then spreads throughout the solution. I find that a shock to the bottle (tap it on the counter) can also induce the crystallization. There is a barrier energy that must be overcome in freezing a liquid, which is what permits supercooled solutions to stay liquid. The model for this was proposed in the 50s (I think), and just recently confirmed."

"The freezing point of an alcohol-water mixture (in this case, beer) depends on the alcohol-water ratio. The more alcohol per unit volume, the lower the freezing point. When you added lime juice (mainly water - no alcohol) you lowered the alcohol-water ratio, raising the freezing point of the mixture to just above the temperature of the (formerly liquid) beer. Another possibility is that the lime juice (with a higher freezing point) freezes on contact with the beer. The freezing process draws energy from the surrounding medium (the beer) causing a chain reaction which freezes the entire beer. Don't worry - it will soon melt if you put it on top of the lawn mower!"

"Adding the lime juice raised the freezing point of the beer. The beer, being at or below this new freezing point when the juice is added, will naturally begin freezing. I would not recommend adding anything to beer as it is more properly consumed straight."

New Question: Summer is almost over and pre-season football games have begun, so it seems to be a good time for this question: In the NFL, quarterbacks are judged on their size, arm strength, and ability to throw a spiral. Why is throwing a spiral so important in football?

"The Challenge" is presented for a little fun. If you have a teaser that you'd like to submit, please e-mail the question and answer to: cchestara@globalspec.com. (The more difficult the challenge, the better!)

Control Testing Systems

For more than 70 years Dillon has been a trusted manufacturer and supplier of quality control testing systems as well as overload protection and weighing products. Our focus is to provide modular products including force and torque gages, test stands, dynamometers and crane scales to be used in every industry. We offer free consulting and product testing so call today to discuss your force measurement requirements. Visit our Web site for more information.

Click here to browse Dillon's online catalog.

Small Positive Displacement Diaphragm Pumps

FLOJET is a leading global supplier of small positive displacement diaphragm pumps that are driven by air or electric motor. FLOJET manufactures pumps, motors and water dispensing systems for a variety of industries, including the beverage, general industrial, agricultural / lawn & garden, recreational vehicle, marine, automotive, car wash, and water dispensing markets. FLOJET has been an expert in special application pumps for over 25 years. Emphasizing high quality and environmental standards, FLOJET has earned the prestigious ISO 9001 and 14001 Certifications. FLOJET is a subsidiary of ITT Industries, the largest pump manufacturer in the world.

Click here to browse FLOJET's online catalog.

New Product Categories On GlobalSpec
These SpecSearchable product categories were recently added
to the GlobalSpec site.
  • Multi-input Display Processors – combine multiple signals from real-time video and computer inputs on a single high-resolution monitor projection.

  • Multi-screen Display Controllers – used to control and to project multiple images on the same screen.

  • Plastic Tubing – constructed of many different plastic compounds for flow lines for fluids and gases in pneumatic, hydraulic, process, medical and many other specialized applications.

  • Wire Forming Services – used to bundle, clip, clamp, label, guide, and protect.
Listed below are the SpecSearchable manufacturers recently added to the
GlobalSpec site, including links to their online catalogs.
A - C (New Suppliers)
D - R (New Suppliers)
S - Z (New Suppliers)

GlobalSpec Links

  A visit to the GlobalSpec Featured Products page will keep you informed of new technologies and product developments; there are currently more than 7,900 products on which you can search by keyword, manufacturer, or by browsing product categories.

 The GlobalSpec Technical Library continues to expand and currently contains over 2,100 articles and links in more than 120 engineering technology categories. You will find application notes, tutorials and other valuable resources in categories such as:

"The ultimate measure of a man is not where he stands in moments of comfort but where he stands at times of challenge and discovery.”
– Martin Luther King, Jr.

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