Thursday, February 23, 2012

AI-Tek Side Look Sensor Used for Speed Take Off

The Side Look Sensor has been developed by AI-Tek Instruments for Allison automatic transmissions for trucks ranging from light duty vans to over the road tractors. It is available for Allison AT, MT and HT transmissions. The new Side Look Sensor improves on earlier designs developed for Allison to replace a mechanical speed system.

The Side Look Sensor is a variable reluctance device that provides electronic transmission speed inputs to engine control systems and/or electronic dashboards. It mounts directly on the transmission and employs a unique magnet configuration that induces a magnetic field on the side of the sensor in the path of the rotating transmission gear. This system with its fewer mounting parts improves reliability, reduces weight and conserves space over the earlier designs.

The new Side Look Sensors uses a molded, glass filled nylon body to protect the sensor in harsh, truck-operating environments. It replaces the old fly-lead design with an integral standard Packard connector, which eliminates the added extra connector cost of the old design. It is available in single and dual output versions.

The Side Look Sensor is manufactured in the United States. AI-Tek Instruments Distributors stock the Side Look Sensor for off-the-shelf maintenance, repair and overhaul (MRO) requirements.

Single Coil:
P/N: 70082-1000-021
P/N: 70082-1000-023

Dual Coil:
P/N: 70082-1000-022
P/N: 70082-1000-024

If you would like more information about these AI-Tek Side Look Sensors or other AI-Tek products please contact Forberg Scientific, Inc. customer service.
Toll Free: 855-288-5330

Wednesday, February 22, 2012

Flow Meter Versatility for Industrial Applications Porter P-Series

Parker's New P-Series Flow Meters Deliver Greater Application Versatility For Industrial Customers
The Porter Instrument Division of Parker Hannifin, the global leader in motion and control technologies, has unveiled the expanded P-Series variable area flow meter product line, an all-new range of flow meters that provides significantly greater application versatility for industrial applications. The expanded P-Series offering enhances Parker’s existing rotameter product line in acrylic, glass and metal tube flow meters. The new products are designed to accommodate greater flow rates, temperatures and environmental conditions.

The P-Series line extension gives customers more choice when sourcing flow measurement and control devices in applications such as oil and gas production, food manufacturing, power generation, chemical and petrochemical, and pharmaceutical manufacturing. The new variable area product line expands the Porter Instrument flow meters range to include:

  • Gas flows up to 350 sft3/m (9910 slpm) of air
  • Liquid flows up to 450 US gpm (1700 lpm) of water
  • Pressures up to 4000 psig (275 Bar)and higher (on special request)
  • Temperatures up to 575o F (300o C) and higher (on special request)
  • NEMA and IP enclosures for weatherproof applications
  • Intrinsically safe transmitter and alarm options
  • Certified calibrations conforming to ISA RP 16.6, NIST traceable
  • High accuracy and repeatability
  • An extensive selection of materials of construction and elastomeric seals to suit a wide range of gases, fluids and environmental conditions
This new line extension, coupled with the Porter Instrument reputation for responsive support and on-time delivery, will give customers the greater product range they need along with the superior service they have come to expect from a world class provider.

Porter Instrument Division specializes in the development, manufacture and sale of precision instruments for the measurement and control of gases and liquids. Porter Instrument flow and pressure control instruments, both standard or modified to customer design requirements, excel in some of the world's most performance-critical applications. They play a vital role in the production of computer chips; they are trusted for the regulation and measurement of anesthetic gases in operating rooms worldwide; and they aid in the production of pharmaceutical drugs, cutting-edge biotech research, dental patient sedation and environmental monitoring, among many other applications.

If you would like more information about Porter Instrument P-Series flow meters or other Porter Instrument products please contact Forberg Scientific, Inc. customer service.
Toll Free: 855-288-5330

Tuesday, February 21, 2012

AI-TEK DH SERIES Hall Effect Sensors

AI-Tek has taken its years of experience of designing and manufacturing Hall Effect sensors for harsh applications and has developed a line of durable products for industrial, rail, military and automotive use.

The new AI-TEK DH series sensors are differential based, zero-speed, precision, single channel, speed sensors. At power-up, they calibrate themselves to the unique magnetic signature of their installed application and continue to update the calibration as the sensor is running. This unique combination of differential sensing technology and calibration make these sensors highly tolerant of installation mis-alignment, target geometry and composition, target run-out, vibration and air gap changes.

In comparison, the RH series are single-element based, zero speed, single channel speed sensors and are an excellent choice for general purpose speed sensing. Unlike the DH series that requires rotational alignment at installation, the RH series requires no alignment. Air gap adjustment is precise and easy and similar to a VR type sensor.

The new DH sensor can sense each change in target movement, regardless of speed, from near zero to 15 kHz frequency range, generating a steady pulse train of frequency proportional to target speed. Typically, each time a gear tooth (or any ferrous discontinuity) passes in front of the sensor the output changes state. This type of sensor is known as a "P" type because it uses N-P-N transistor logic (as opposed to "N" type, which uses P-N-P transistor logic).

Key Features:

  • Reverse voltage protection, up to -30 Vdc, to prevent damage if miswired
  • High temperature range of -40C to +125C
  • Wide range of supply voltage in single design of 4.5 - 24 Vdc
  • Two output options of Supply Tracking or TTL Compatible
  • Rugged design meeting IEC 77 Standards (European Railroad Applications)
  • Require special alignment
  • Improved duty cycle
  • Improved fine pitch performance
  • Increased air gaps

  • Suitable for 32 diametral pitch or coarser gear (target), the standard catalog sensors are easily applied to your various sensing needs. If you have a unique, special requirement which cannot be met with any of the standard options, we will gladly review your specs and work with you on a special sensor design.

    If you would like more information and pricing about AI-TEK Speed Sensors or other AI-TEK items please contact Forberg Scientific, Inc. Customer Service.
    Toll Free: 855-288-5330

    Monday, February 20, 2012

    Advantages of Wika Liquid-filled Gauges

    Liquid-filled gauges
    Liquid-filled pressure gauges provide a number of advantages:

    • The liquid absorbs vibration and pressure spikes
    • The dampening action of the liquid enables the operator to
      take readings during conditions of rapid dynamic loading and
    • The liquid lubricates all moving elements, dramatically
      reducing wear in the movement
    • Because most liquid-filled gauges are filled with non-aqueous
      liquid and hermetically sealed, they perform in corrosive environments
      and are immune to moisture penetration and icing
      and shock effects are lessened
    Liquid-filled gauges enhance the reliability and integrity of the measuring system for long periods under extreme operating conditions.

    Liquid-fill fluidAmbient Temperature Ratings (Table A)

    Allowable operating range
    Temperature range in which the operation of the gauge is not adversely affected by the filling liquid. At temperatures above the maximum rating, the fluid may break down. At temperatures below the minimum rating, the fluid may solidify (freeze).
    Choose the right liquid
    The type of liquid used to fill the gauge varies with the application. Although pure glycerine provides the best performance in most applications, each has its own requirements. Guidelines to help ensure that a fluid is properly matched to an application are:

    • If icing is a problem, use gauges filled with silicone oil or other comparable liquids. They have low viscosities even at -60C
    • If the system has electric accessories, such as contacts, use insulating oils
    • If extreme temperature fluctuations are expected, use silicone oils
    The higher the liquid viscosity, the greater its dampening capacity. The reason for this is that dampening changes in proportion to the temperature-dependent viscosity of the filling liquid. The suitable degree of dampening depends on the operating requirements the gauge must meet, such as pointer response time, pressure extremes, vibration and changes in pressure. WIKA can recommend specific liquids to suit problem applications.

    Liquid-filled gauge case venting
    For pressure gauges with full scale ranges of 300 psi and below (including vacuum and compound ranges of 30" Hg-0-200 psi and below), case venting (after the gauge is installed) is necessary to preserve the accuracy. Temperature fluctuations during shipment and in the process application cause the liquid filling to expand and contract which in turn increases or decreases case pressure. As a result, accuracy can be decreased and the pointer may not return to zero properly until the gauge is vented to the atmosphere.

    To vent a WIKA gauge, move the valve to the open position which will release any pressure or vacuum built up in the case. If the gauge is installed in an upright position, the lever can be left in the open position. The lever allows the use of a gauge in a non-upright orientation.

    If you would like to get more information about WIKA pressure gauges or other WIKA products please contace Forberg Scientific, Inc. customer service.
    Toll Free: 1-855-288-5330

    Sunday, February 19, 2012

    Selecting a Pressure Gauge

    When selecting a pressure gauge, it is important to consider the following factors to ensure safety and accuracy:

    1. Pressure fluid composition
    2. Pressure fluid temperature
    3. Ambient conditions
    4. Pressure range
    5. Conditions affecting wear of the system
    6. Method of mounting
    7. Required accuracy

    1. Pressure fluid composition
    Since the sensing element of a pressure gauge may be exposed directly to the measured medium, consider the characteristics of this medium. It may be corrosive, it may solidify at various temperatures or it may contain solids that will leave deposits inside the sensing element. For pressure fluids that will not solidify under normal conditions or leave deposits, a Bourdon tube gauge is acceptable. Otherwise a Sealgauge or diaphragm seal should be used. A chemical compatibility chart follows this section to aid in the selection of the proper sensing element material.

    2. Pressure fluid temperature
    Steam and other hot media may raise the temperature of the gauge components above safe working limits of the sealed joints. In these cases it is recommended that a siphon, cooling tower or diaphragm seal be used in conjunction with the pressure gauge.

    3. Ambient conditions
    The normal ambient temperature range for WIKA pressure gauges is -40F to +140F (-4C to +60C) for dry or silicone-filled gauges and -4F to +140F (-20C to +60C) for glycerine-filled gauges. The error caused by temperature changes is +0.3% or -0.3% per 18F rise or fall, respectively. The reference temperature is 70F (20C). The correction is for the temperature of the gauge and not the temperature of the measured medium. Remote gauge mounting using a diaphragm seal and capillary line is one alternative for applications involving extreme ambient temperature. Moisture and weather effects must also be considered. Liquid-filled gauges prevent condensation build up. For outdoor use, stainless steel, brass or plastic cased gauges are recommended.

    4. Pressure range
    gauge range of twice the working pressure is generally selected. The working pressure in all cases should be limited to 75% of the gauge range. Where alternating pressure and pulsation are encountered, working pressure should be limited to 2/3 of the gauge range.

    5. Conditions affecting wear of the system
    In applications involving severe pressure fluctuation or pulsation, the use of restrictors and/or snubbers is recommended. In addition,
    liquid-filled gauges increase the service life of gauges in these conditions. WIKA liquid filled gauges are generally filled with glycerine. Silicone for larger temperature extremes and Halocarbon® for use with oxidizing agents such as chlorine, oxygen and hydrogen peroxide are also available.

    6. Method of mounting
    Radial (LM) and back (CBM or LBM) connections are available for most
    WIKA gauges. WIKA stocks gauges with standard NPT threaded connections. Other types such as metric threads, straight threads, hose barbs and special fittings are available as a special order. Pressure gauges should be mounted in the upright position. For applications where the gauge is mounted side ways, horizontally or upside down, contact WIKA or Forberg Scientific Inc. Customer Service for gauge type compatibility.

    7. Required accuracyWIKA stocks gauges with accuracies from ± 3/2/3% to ±0.1% of span (ASME Grade B to Grade 4A).

    To ensure safe and accurate gauge selection, you must take all of the above factors into consideration. When in doubt, please do not hesitate to contact Forberg Scientific Inc. Customer Service for assistance!
    Toll Free: 855-288-5330