Saturday, June 27, 2009

LG ARENA KM900 - I like this!

Right out of the box the LG Arena looks trendy, with the dark grey polished metal exterior giving the phone a luxurious feel. Measuring 105.9 x 55.3 x 12mm, the phone is slightly smaller than the iPhone and feels solid when held. It sports a 3in colour TFT capacitive-based touchscreen that provides a sharp and lively viewing experience. LG Arena boasts the new S-class user interface (UI) that promises more fluid transitions, which results in better responsiveness that would ­certainly remind users of the iPhone. But the Arena doesn’t stop there. What you get is a breathtaking 3in screen, quality housing and a massive array of features that include a music player with Dolby Mobile, A-GPS, FM radio and even the not-so-standard FM transmitter. The phone also boasts myriad of wireless connectivity options including, quad-band GSM, EDGE, HSDPA, Bluetooth with A2DP profile and WiFi 802.11b/g. The Arena has a 5-megapixel camera with autofocus and flash that can capture still images at up to 2,592 x 1,944-pixels. It’s also capable of shooting video at 720 x 480-pixel ­resolution at 30 frames per second. The phone comes with a whopping 8GB of internal memory — that’s a lot of space to store your …

LG ARENA KM900 VIDEO - Enjoy....

Saturday, June 20, 2009

Introduction to Ultrasonic Doppler Flow Meters

What is a Doppler Ultrasonic Flow Meter?

An ultrasonic flowmeter (non-intrusive Doppler flow meters) is a volumetric flow meter which requires particulates or bubbles in the flow. Ultrasonic flowmeters are ideal for wastewater applications or any dirty liquid which is conductive or water based. Ultrasonics flowmeters will generally not work with distilled water or drinking water. Aerations would be required in the clean liquid applications. Ultrasonic flowmeters are also ideal for applications where low pressure drop, chemical compatibility, and low maintenance are required.


The basic principle of operation employs the frequency shift (Doppler Effect) of an ultrasonic signal when it is reflected by suspended particles or gas bubbles (discontinuities) in motion. This metering technique utilizes the physical phenomenon of a sound wave that changes frequency when it is reflected by moving discontinuities in a flowing liquid. Ultrasonic sound is transmitted into a pipe with flowing liquids, and the discontinuities reflect the ultrasonic wave with a slightly different frequency that is directly proportional to the rate of flow of the liquid (Figure 1). Current technology requires that the liquid contain at least 100 parts per million (PPM) of 100 micron or larger suspended particles or bubbles.


The key questions which need to be answered before selecting an ultrasonic flow meter or doppler flowmeter are:

  • Does the liquid have particulates of 100 ppm of 100 microns in size?

  • Do you require a handheld or continuous process monitor?

  • Do you require an analog output?

  • What is the minimum and maximum flow rate for the flow meter?

  • What is the minimum and maximum process temperature?

  • What is the minimum and maximum process pressure?

  • What is the size of the pipe?

  • Is the pipe always full?


    Clamp-on ultrasonic flow meters come in either single or dual-sensor versions. In the single-sensor version, the transmit and receive crystals are potted into the same sensor body, which is clamped onto a single point of the pipe surface (Figure 4-8). A coupling compound is used ultrasonically connect the sensor to the pipe. In the dual sensor version, the transmit crystal is in one sensor body, while the receive crystal is in another. Clamp-on Doppler flowmeters are subject to interference from the pipe wall itself, as well as from any air space between the sensor and the wall. If the pipe wall is made of stainless steel, it might conduct the transmit signal far enough so that the returning echo will be shifted enough to interfere with the reading. There are also built-in acoustic discontinuities in copper, concrete-lined, plastic-lined, and fiberglass-reinforced pipes. These are significant enough to either completely scatter the transmitted signal or attenuate the return signal. This dramatically decreases flowmeter accuracy (to within only ±20%), and, in most cases, clamp-on meters will not work at all if the pipe is lined.

    More details you can go to the website (

    Tuesday, June 9, 2009

    Fluke 99B Application?

    Fluke 99B

    You want to know more about this test equipment?
    click here... Fluke 99B, Fluke 99, Fluke 99

    or you can just google at internet...
    there are a lot of info you can get...

    p/s: Currently I am very busy with my daily job
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