3151/3051竖管道式差压密度计用于各种液体或液态混合物密度在线测量的自动化测量仪表。是一种用于连续在线测量液体密度的现场仪表，可直接用于工业生产过程。智能在线密度计采用先进技术，包括：一个电容式高精度差压传感器以及与其相连接的、插入生产过程的一对压力中继器。在两个压力中继器之间有个温度传感器，用来补偿过程液体的温度变化。3151/3051竖管道式差压密度计工作时连续在线测量液体密度，无过程中断。可直接用于生产过程的控制；采用一体化的两线制变送器结构，无活动部件安装使用方便、维护简单；配带清洗装置，可定期清洗探头，从而保证使用精度。
3151 / 3051 vertical pipe differential pressure densimeter is an automatic instrument for on-line measurement of density of various liquids or liquid mixtures. It is a field instrument for continuous on-line measurement of liquid density, which can be directly used in industrial production process. The intelligent on-line densitometer adopts advanced technology, including a capacitive high-precision differential pressure sensor and a pair of pressure repeaters connected to it and inserted into the production process. There is a temperature sensor between the two pressure repeaters to compensate for the temperature change of the process liquid. 3151 / 3051 vertical pipeline differential pressure densimeter can measure liquid density continuously and on line without process interruption. It can be directly used for the control of the production process; it adopts the integrated two-wire transmitter structure, no moving parts, easy to install, use and maintain; equipped with cleaning device, the probe can be cleaned regularly to ensure the use accuracy.
决定精度的有，非线性，迟滞性，非重复性，温度、零点偏置刻度，温度的影响。但主要由压力变送器非线性，迟滞性，非重复性，精度越高，价格也就越高。每一种电子式地测量计都会有精度误差的,但是由于各个国家所标地精度等级是不一样的,比如,中国和美国等国家标的精度是传感器在线性度最好的部分,也就是我们通常所说的测量范围的10%到90%之间的精度;而欧洲标的精度则是线性度最不好的部分,也就是我们通常所说地测量反的0到10%以及90%到100%之间的精度.如欧洲标的精度为1%,则在中国标的精度就为0.5%。
The accuracy is determined by nonlinearity, hysteresis, non repeatability, temperature, zero offset scale, and temperature effect. But mainly by the pressure transmitter nonlinear, hysteresis, non repeatability, the higher the accuracy, the higher the price. Each kind of electronic geometer will have accuracy error, but because the accuracy level of each country is different, for example, the accuracy of national standards such as China and the United States is the best part of the sensor's linearity, that is, the accuracy between 10% and 90% of the measurement range as we usually call it; while the accuracy of European standard is the worst part of linearity, In other words, we usually say that the accuracy of the measurement reverse is between 0% and 10% and 90% to 100%. If the accuracy of European standard is 1%, the accuracy of Chinese standard is 0.5%.
产品在石化行业可广泛应用于石油、炼油、调油、油水介面检测；在食品工业用于葡萄汁、番茄汁、果糖浆、植物油及软饮料加工等生产现场；奶制品业；造纸业；黑浆、绿浆、白浆、碱溶液的测量；酿酒酒精度；化工类的尿素、清洁剂、乙二醇、酸碱及聚合物密度的测量。还可应用于采矿盐水、钾碱、天然气、润滑油、生物制药等行业。
The products can be widely used in the petrochemical industry for the detection of oil, oil refining, oil blending and oil-water interface detection; in the food industry, it is used for the processing of grape juice, tomato juice, fructose syrup, vegetable oil and soft drinks; the dairy industry; the paper industry; the measurement of black pulp, green pulp, white pulp and alkali solution; the accuracy of wine making; the chemical urea, detergent, ethylene glycol, acid-base and polymer density Degree measurement. It can also be used in mining brine, potash, natural gas, lubricating oil, biopharmaceutical and other industries.
测量范围：0.000–3.000g/cm3(0000–3000kg/m3)（用户可随意选用测量范围）
Measurement range: 0.000 – 3.000g/cm3 (0000 – 3000kg / m3) (users can choose the measurement range at will)
标定范围：0.500–3.000g/cm3(500–3000kg/m3)（根据用户选用测量范围来标定）
Calibration range: 0.500 – 3.000g/cm3 (500 – 3000kg / m3) (calibrated according to the measurement range selected by users)
测量精度：±0.01g/cm3、±0.005g/cm3、±0.002g/cm3（用户自行选择适用精度）
Measurement accuracy: ± 0.01g/cm3, ± 0.005g/cm3, ± 0.002g/cm3 (user's choice of applicable accuracy)
重复性：±0.0005g/cm3(±0.5kg/m3)
Repeatability: ± 0.0005g/cm3 (± 0.5kg/m3)
操作温度范围：-50℃~+250℃（不同介质温度可选，分为低温、常温、高温型）
Operating temperature range: - 50 ℃ ~ + 250 ℃ (different medium temperatures can be selected, including low temperature, normal temperature and high temperature)
最大工作压力：7.0MPa
Maximum working pressure: 7.0Mpa
流体粘度范围：0–20000cP
Fluid viscosity range: 0 – 20000 CP
温度系数：小于0.1kg/m3/℃(校正后)
Temperature coefficient: less than 0.1kg/m3 / ℃ (after correction)
压力影响：可忽略不计
Pressure effect: negligible
内置温度传感器：PT1000
Built in temperature sensor: PT1000
接液材质：316L、哈氏合金C-276、钽、钛、聚四氟乙烯（特富隆）、
Contact material: 316L, Hastelloy C-276, tantalum, titanium, polytetrafluoroethylene (Teflon)
用上述的常规方法对智能变送器进行校准是不行的，因为这是由HART变送器结构原理所决定了。因为智能变送器在输入压力源和产生的4-20mA电流信号之间，除机械、电路外，还有微处理芯片对输入数据的运算工作。因此调校与常规方法有所区别。
It is impossible to calibrate the smart transmitter with the above conventional method, because it is determined by the structure and principle of Hart transmitter. Because the intelligent transmitter between the input pressure source and the generated 4-20mA current signal, in addition to mechanical and electrical circuits, there is also a microprocessor chip for input data operation. Therefore, the adjustment is different from the conventional method.
实际上厂家对智能变送器的校准也是有说明的，如3151/3051竖管道式差压密度计的变送器，对校准就有:“设定量程"、“重定量程"、“微调"之分。其中“设定量程"操作主要是通过LRV.URV的数字设定来完成配置工作，而“重定量程"操作则要求将变送器连接到标准压力源上，通过一系列指令引导，由变送器直接感应实际压力并对数值进行设置。而量程的初始、最终设置直接取决于真实的压力输入值。但要看到尽管变送器的模拟输出与所用的输入值关系正确，但过程值的数字读数显示的数值会略有不同，这可通过微调项来进行校准。由于各部分既要单独调校又必需要联调，因此实际校准时可按以下步骤进行:
In fact, the manufacturer also has instructions for the calibration of intelligent transmitter. For example, for the transmitter of 3151 / 3051 vertical pipeline differential pressure densimeter, there are "set range", "reset range" and "fine adjustment". The "set range" operation is mainly through the LRV.URV The "pressure source" is directly connected to the "pressure source" to set the working pressure. However, the initial and final setting of the range directly depends on the actual pressure input value. However, it should be noted that although the relationship between the analog output of the transmitter and the input value used is correct, the value displayed by the digital reading of the process value will be slightly different, which can be calibrated by adjusting the term. Since each part needs to be adjusted separately and jointly, the actual calibration can be carried out according to the following steps:
1．先做一次4-20mA微调，用以校正变送器内部的D/A转换器，由于其不涉及传感部件，无需外部压力信号源。
1. Make a 4-20mA fine adjustment to calibrate the D / a converter inside the transmitter. Since it does not involve sensing components, there is no need for external pressure signal source.
2．再做一次全程微调，使4-20mA、数字读数与实际施加的压力信号相吻合，因此需要压力信号源。
2. Make another fine adjustment in the whole process to make the 4-20mA digital reading consistent with the actual pressure signal, so the pressure signal source is needed.
3．最后做重定量程，通过调整使模拟输出4-20mA与外加的压力信号源相吻合，其作用与变送器外壳上的调零(Z)、调量程(R)开关的作用完全相同。
3. Finally, rerange and adjust the analog output 4-20mA to match the external pressure signal source. Its function is exactly the same as the zero (z) and range (R) switches on the transmitter shell.
华恒西安变送器厂家采用多元化的经营思想，在生产经营工业自动化仪表及装置的同时，也在仪表控制系统集成，仪表及设备成套，安装调试及维修服务，技术培训及咨询等方面有突出的业绩。代表项目有在彩虹集团玻璃烧结动能控制系统，汉江药业锅炉技术改造等。
Huaheng Xi'an transmitter manufacturer adopts diversified business ideas. While producing and operating industrial automation instruments and devices, it also has outstanding achievements in instrument control system integration, complete set of instruments and equipment, installation, commissioning and maintenance services, technical training and consulting. The representative projects include the kinetic energy control system of glass sintering in rainbow group and the technical transformation of boilers in Hanjiang pharmaceutical industry.
华恒西安变送器厂家凭借专业技术优势，可靠稳定的产品质量，坚持最大限度的满足用户的需求是企业发展的动力源泉，以优质专业的服务为我国电力、石油、化工、冶金、水泥、矿业、市政、造纸等行业提供了高性能价格比的工业自动化仪表产品。为我国自动化仪表的发展做出了重要
Huaheng Xi'an transmitter manufacturers rely on professional and technical advantages, reliable and stable product quality, adhere to the maximum meet the needs of users is the power source of enterprise development, with high-quality professional services for China's electric power, petroleum, chemical, metallurgy, cement, mining, municipal, papermaking and other industries to provide high performance price ratio of industrial automation instrument products. It is important for the development of automation instrument in China