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廣泛應用于電力、石油、化工、冶金等行業和一些科研單位。對汽輪機、水輪機、鼓風機、壓縮機、空分機、齒輪箱、大型冷卻泵等大型旋轉機械軸的徑向振動、軸向位移、鍵相器、軸轉速、脹差、偏心、以及轉子動力學研究和零件尺寸檢驗等進行在線測量和保護。 
軸向振動轉速位移測量對于許多旋轉機械，包括蒸汽輪機、燃汽輪機、水輪機、離心式和軸流式壓縮機、離心泵等，軸向位移是一個十分重要的信號，過大的軸向位移將會引起過大的機構損壞。軸向位移的測量，可以指示旋轉部件與固定部件之間的軸向間隙或相對瞬時的位移變化，用以防止機器的破壞。軸向位移是指機器內部轉子沿軸心方向，相對于止推軸承二者之間的間隙而言。有些機械故障，也可通過軸向振動位移的探測

The VK-A Series vibration transducer is an eddy-currenttransducer designed to satisfy the American Petroleum Institute API St’d 670. It measures the shaft vibration of rotating machinery without contact. This is the most appropriate sensor to measure the shaft vibration of rotating machinery supported by plain bearings and is frequently used to monitor the vibration of turbine generators and compressors. In addition, it can be used in an explosive gas atmosphere due to its intrinsic safety construction.  Main Functions 1. System composition Consists of sensor, extension cable and driver. Available in system lengths of 5m and 9m to cover the total distance between sensor and driver. 2. Intrinsic safety explosion-proof construction RIIS equivalent to IEC standard Ex ia IIC T6 FM, BASEEFA 3. Environment Extensive operating temperature range (−40 to +177°C) Not affected by lubricating oil mist or dust. (exclude connector) Ammonia resistance and measures for hydrogen sulfide-protected models are also available (for details, contact us) (Not available for rain water at out door use) 4. Conforming to API Standard product which is based on API St’d 670 regarding scale factor error, interchangeability and sensor size. ■ Specifications VK-202A 2,000µm Transducer VK-452A 4,500µm Transducer Calibrated material JIS SCM440 (AISI 4140 Steel) flat surface Linear range* 2,000µm (approx. 80mils) 4,500µm (approx. 180mils) (less than ±75µm at linearity) 4,000µm (approx. 160mils) (less than ±10% at scale factor) Sensitivity* 787mV/l00µm (200mV/mil) 394mV/100µm (100mV/mil) Scale factor error* Within ±5% of 787mV/l00µm (if calibrated as a system) Within ±10% of 394mV/l00µm (if calibrated as a system) Linearity* Within ±20µm of 787mV/l00µm (if calibrated as a system) Within ±75µm of 394mV/l00µm (if calibrated as a system) Operating temperature range Sensor −40 to +l77°C (−40 to +350°F) (connector: max. +125°C) Extension cable −40 to +l77°C (−40 to +350°F) (connector: max. +125°C) Driver −38 to +80°C (−36 to +176°F) Operating humidity range 30 to 95% RH (non condensing, non-submerged) Power supply −17.5VDC to −26VDC Max. output voltage Approx. −22VDC (At −24VDC power supply voltage) Current consumption (at 10k? load resistance) Max. −16mA Max. −20mA Frequency response DC to 20kHz (−3db) DC to 10kHz (−3db) Output impedance 50? Sensor tip diameter Approx. ø5mm or approx. ø8mm Approx. ø11mm Connector material Stainless steel, Gold-plated finish Sensor cable length 0.5 or 1m System cable length Sensor cable length + Extension cable length = 5m±10% or 9m±10%