原理：
超聲波物位計的工作原理是由換能器（探頭）發(fā)出高頻超聲波脈沖遇到被測介質(zhì)表面被反射回來，部分反射回波被同一換能器接收，轉(zhuǎn)換成電信號。超聲波脈沖以聲波速度傳播，從發(fā)射到接收到超聲波脈沖所需時間間隔與換能器到被測介質(zhì)表面的距離成正比。此距離值S與聲速C和傳輸時間T之間的關(guān)系可以用公式表示：S=CxT/2。
由于發(fā)射的超聲波脈沖有一定的寬度，使得距離換能器較近的小段區(qū)域內(nèi)的反射波與發(fā)射波重迭，無法識別，不能測量其距離值。這個區(qū)域稱為測量盲區(qū)。盲區(qū)的大小與超聲波物位計的型號有關(guān)。
特點：
由于采用了的微處理器和獨特的EchoDiscovery回波處理技術(shù)，超聲波物位計可以應(yīng)用于各種復(fù)雜工況。
“虛假回波學(xué)習(xí)”功能使得儀表在多個虛假回波的工況下，可正確地確認真實回波，獲得準確的測量結(jié)果。
換能器內(nèi)置溫度傳感器，可實現(xiàn)測量值的溫度補償。
超聲波換能器采用聲學(xué)匹配之技術(shù)，使其發(fā)射功率能更有效地輻射出去，提高信號強度，從而實現(xiàn)準確測量。
應(yīng)用： 各類工業(yè)領(lǐng)域的液位測量，特別是水處理工業(yè)。
測量范圍： 液體：WTCSL551 [0.25…4m] / WTCSL552[0.4…8m] / WTCSL553[0.5…15m ]
過程連接： WTCSL551 [G1½A] / WTCSL552 [G2A ] / WTCSL553 [ 換能器外殼材料： PTFE、PU/PC
過程溫度： -40…70°C
過程壓力： -0.2…1bar
信號輸出： 兩線制/四線制 4…20mA/HART
詳細介紹：
許可證
P 標準型(非防爆)
I 本安型(Exia IIB T6)
換能器材料/過程溫度/防護等級
A PU/PC/（-40～70）℃/IP66
電子組件
B (4～20)mA/HART兩線制
C (4～20)mA/(22.8～26.4)V DC/HART兩線/四線制
D (198～242)V AC/HART四線制
外殼／防護等級
A 鋁/IP67
B 塑料/IP66
D 鋁兩腔/IP67
G 不銹鋼316L/IP67
電纜進線
M M20x1.5
N ½NPT
現(xiàn)場顯示/編程
A 帶
X 不帶
注:本安型只可選“A”型外殼，及“C”電子組件;“C”或“D”電子組件只能配“D”外殼。
Principle: The principle of ultrasonic level meter is that the transducer (probe) sends out high frequency ultrasonic pulse when the surface of the measured medium is reflected back, and part of the reflected echo is received by the same transducer and converted into electrical signal. the ultrasonic pulse propagates at acoustic velocity, and the time interval required from transmitting to receiving the ultrasonic pulse is proportional to the distance from the transducer to the surface of the measured medium. The relationship between the distance value S and the sound velocity C and transmission time T can be expressed by formula: S=CxT/2.. Because the transmitted ultrasonic pulse has a certain width, the reflected wave in the small section area close to the transducer overlaps with the emission wave, which can not be recognized and its distance value can not be measured. This area is called the measurement blind area. The size of blind area is related to the model of ultrasonic level meter. Features: Because of the advanced microprocessor and unique EchoDiscovery echo processing technology, ultrasonic level meter can be used in various complex working conditions. The function of "false echo learning" enables the instrument to correctly confirm the true echo and obtain accurate measurement results under the condition of multiple false echoes. transducer built-in temperature sensor, which can realize the temperature compensation of the measured value. The ultrasonic transducer adopts the patent technology of best acoustic matching, so that its transmitting power can radiate out more effectively and increase the signal intensity, so as to realize accurate measurement. Applications: liquid level measurement in various industrial fields, especially the water treatment industry. Scope of measurement: Liquid: WTCSL551[0.25…4m]/WTCSL552[0.4…8m]/WTCSL553[0.5…15m] Process connection: WTCSL551[G1½A]/WTCSL552[G2A ]/WTCSL553[ flange or hanger] Transducer housing material: PTFE、PU/PC Process temperature: -40.70°C Process pressure: -0.2...1 bar Signal output: Double wire / four wire 4.20 mA/HART Details: Licences P standard (non-explosive) I intrinsically safe (Exia IIB T6) transducer material/process temperature/protection level A PU/PC/(-40~70)℃/ IP66 Electronic components B (4~20) mA/HART two-wire system C (4~20) mA/(22.8C (4~26.4) V DC/HART two-wire/four-wire system D (198~242) V AC/HART four-wire system Shell/protection level A aluminium/ IP67 B plastics/ IP66 D aluminium two cavities/ IP67 G stainless steel 316 L/IP67 Cable feed line M M20x1.5 N ½NPT Field display/programming A belt X not Note: This safety type is optional only for "A" type enclosure, and" C" electronic assembly ;" C" or "D" electronic assembly can only be fitted with" D" enclosure.
