Emcee 1152 电导率分析Digital Conductivity Met

EMCEE 1152 航空燃料电导率仪

EMCE1152 航空燃料电导率仪提供了一种符合ASTM D2624标准要求的液体电导率测试方法，电导率值以pS/m为单位。仪器杰出的机电设计可方便地使用于实验室和工业生产中。基于安全原因，本仪器首先用 于烃类燃料特别是航空燃料的电导率测定，在改进后被大量应用于其他液体电导率的测定。

技术参数

测量范围0～1999pS/m
分辨率: 1pS/m
精度：2%（测量值）
校准：内部自动校准
显示：LCD
超测量范围指示：屏幕的左边显示“1”
操作：两键，M 测量，C 校正
可选温度范围：32—165F (0— 75℃)
电源：3个6伏碱性电池供电。
携带仪器箱：硬质、抗溶解、塑料模制

主要特点

测试便捷、可靠、精确的数字电导率仪。
也可适用于其他的标准或非标准测量范围。
大屏幕数字液晶显示。
采用先进可靠的集成电路技术。
具有场调整，实现了自动校准功能。
超测量范围或低电流时自动显示。
可以使用短的电缆或电缆盘，测试贮罐和贮罐车中的物料。
电导率仪内置于表面粗糙、涂有防锈涂料的铝制外壳中，配有可分离的不锈钢探头。
本质安全，可在危险防爆区域内使用，通过了Underwriters Laboratories (UL)、Canadian Standards Association (CSA)和LCIE等机构的安全认证

ASTMStandard Test Method D 2624 included in Specifications D975, D1655, and D7566

• Continuous standard electrical conductivity range from 1 to 2000 in increments of 1 picosiemen per meter (pS/m)

• Available in other standard and non-standard conductivity ranges up to 20M pS/m

• Large digital, liquid crystal display

• Reliable advanced integrated circuit design technology

• Self check calibration with field adjustment capability

• Automatic over range and low battery indication

• Capable of storage tank and tanker truck measurement with the use of a short cable or cable reel kit

• Powered by 3 readily available alkaline batteries

• Electronics housed in a rugged cast aluminum case coated with solvent resistant paint equipped with a detachable stainless steel probe

• Approved intrinsically safe design for use in hazardous environments by Underwriters Laboratories (UL) U.S, (UL) Canada and LCIE (Europe)

Applications

The Model 1152 Digital Conductivity meter provides a measurement of electrical conductivity of fluids in conductivity units (CU), which are defined as picosiemens per meter in ASTM D2624. The rugged Electro/mechanical design of the Model 1152 meter facilitates ease of use for both laboratory and field applications. Initially the meter was designed and developed for safety reasons to measure the electrical conductivity of hydrocarbon fuels, particularly jet fuels. Subsequently, the meter was modified with other conductivity ranges to accommodate measurement of a variety of fluids for use in many different applications.

Safety

Hydrocarbon fuels typically have low electrical conductivity and consequently are susceptible to retaining a static charge. Static charges are  induced, especially, when the fuel is pumped at high rates through filters. Due to the relatively low conductivity, the static charge does not readily dissipate and is retained for a considerable period of time. This condition can result in an explosion and/or fire. Since conductivity can vary with temperature it is important to record the fuel temperature at which the measurement was performed.

Process Controls

In addition to safety reasons, electrical conductivity of fluids can be monitored for process control. Proper addition and mixing of various ingredients can be monitored at different stages of production. These applications are not limited to hydrocarbons, but have been expanded to other products; such as paints, solvents, inks, and other non-organic items. The stainless  steel probe is relatively unaffected by most acidic and caustic solutions.

Theory of Operation

The EMCEE Model 1152 meter consists of an electronics assembly and a detachable stainless steel probe. The probe, which is similar to a capacitor having concentric electrodes, is immersed into the fluid up to the set of holes closet to the electronics assembly. Depressing the “M” pushbutton causes a relatively small direct current to flow through the fluid between the electrodes. The current is amplified in the electronics assembly and is displayed on the liquid crystal display in picosiemens per meter (pS/m).