当用在户外测量时，传统的超声波传送器在太阳直射时，很容易受来自太阳能增加造成的误差影响。Mobrey MSP900FH传送器已将遥控温度传感器直接与传送器相连，经过专门设计克服了这些问题。测量范围恰好是10mmX25mm, 紧凑的传感器可以很容易地安置在适当的背阴位置，位于液体表面与传送器之间。这样，系统保证以声速估算的气温测量才是真实且具代表性的。
艾默生水力行业专家Peter Ward解释说：“这是对普通问题最简洁且具功能性的解决方案。在用户现场， MSP900FH在拓展领域测试中的始终如一的表现都超出传统的设计。“
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[font=times] Emerson’s new Mobrey® ultrasonic level transmitter is optimized for open channel flow measurement
[font=times][Color=#708090]Transmitter helps processing sites measure open channel flow more accurately.
AUSTIN, TEXAS （January 15, 2008） – Emerson Process Management is offering a new version of its popular Mobrey® MSP900 ultrasonic level transmitter, optimized for use in open channel flow measurement. The new MSP900FH features a pre-wired remote temperature sensor and is ideal for water and industrial processing sites looking to improve the accuracy of their open channel flow measurements.
Used in the open air, conventional ultrasonic level transmitters are prone to suffer from inaccuracies caused by "solar gain" when the sun shines directly on them. The Mobrey MSP900FH transmitter has been designed to overcome this problem by using a remote temperature sensor wired directly into the transmitter. Measuring just 10mm diameter x 25mm length, the compact sensor can easily be located in an appropriately shady spot between the liquid surface and the transmitter. In this way, the system ensures that the air temperature measurement used in the speed of sound calculation is truly representative.
The sensor is hard-wired into the transmitter with a two-meter cable, so there is no additional cabling or set up required, and only a single connection to the controller, thus keeping installation costs to a minimum.
"We have made this development as a direct response to what our customers were telling us," explains Emerson water industry expert Peter Ward. "It is a neat, functional answer to a common problem. In extended field trials at a customer site MSP900FH consistently out-performed competitive conventional designs."
The Mobrey MSP900FH is 24V DC loop powered, supplied in a waterproof housing sealed to IP68. It has both analog 4-20mA communications and digital HART options built-in, and can be used stand-alone, or as part of a site-wide measurement, control and data acquisition system.
Mobrey MSP level transmitters are part of the broad range of intelligent, digital field devices that power the PlantWeb® digital plant architecture to improve plant efficiency by 2% and more through delivering asset optimization, process automation, and management execution. [/color][/font]