在为3151智能法兰式液位变送器变送器进行选型时候，有一条说明很引人注目-3151智能法兰式液位变送器/3051压力变送器量程比为100:1，一开始还以为这种表示的意思是实际的测量范围是100，理论的测量范围是1，这种理解显然是不正确的。经过查阅资料才发现量程比其实是最大测量范围和最小测量范围之比。不是量程比越大变送器的性能就越好

In the selection of 3151 intelligent flange liquid level transmitter, there is a very striking statement - the range ratio of 3151 intelligent flange liquid level transmitter / 3051 pressure transmitter is 100:1. At first, I thought that this expression meant that the actual measurement range is 100, and the theoretical measurement range is 1. This understanding is obviously incorrect. After consulting the data, it is found that the range ratio is actually the ratio of the maximum measurement range to the minimum measurement range. It is not that the larger the range ratio, the better the performance of the transmitter

说到量程比，先引入一个使用量程的问题。一个测量范围为0-200kpa的压力变送器，当我们实际测量的压力为50kpa时，我们选择的量程应为0-100kpa，这个量程就是使用量程。如果量程比是10:1，最小量程是0-25kpa，使用量程是0-20kpa，则变送器的精度就会下降，使用量程在0.50kpa时候，仪表的精度就能够保证。使用量程和最大量程不能相差太大，否则精度不达标。

When it comes to the range ratio, first introduce a question of using the range. A pressure transmitter with a measurement range of 0-200kpa. When the actual measured pressure is 50kPa, the range we choose should be 0-100kpa, which is the range used. If the range ratio is 10:1, the minimum range is 0-25kpa, and the range used is 0-20kpa, the accuracy of the transmitter will be reduced. When the range used is 0.50kpa, the accuracy of the instrument can be guaranteed. The difference between the range used and the maximum range shall not be too large, otherwise the accuracy is not up to standard.

变送器的好坏不仅仅看量程比和温度等影响系数

The quality of the transmitter depends not only on the range ratio, temperature and other influencing factors

1、合理选择材料

1. Reasonable selection of materials

有针对性地选择耐腐蚀金属或非金属材料来制造仪表的零部件，是工业仪表防腐蚀的根本方法。例如用钛、钽金属制作的仪表零件，对氯化学介质有很强的耐腐蚀性；用聚四氟乙烯材料制作的仪表部件和密封垫，也广泛地应用在各种腐蚀介质环境中。

It is the fundamental method to select corrosion-resistant metal or non-metallic materials to manufacture instrument parts. For example, the instrument parts made of titanium and tantalum have strong corrosion resistance to chlorine chemical medium; the instrument parts and gaskets made of polytetrafluoroethylene are also widely used in various corrosive medium environments.

2、加保护层

2. Add protective layer

在仪表零件或部件上制成保护层，是工业中十分普遍的防腐蚀方法。按照保护层的材料和成形原理不同，可分为如下三种：

It is a very common anti-corrosion method in industry to make a protective layer on instrument parts or components. According to the different materials and forming principles of the protective layer, it can be divided into the following three types:

金属保护层。包括喷涂、电镀、热浸、渗碳等。

Metal protective layer. Including spraying, electroplating, hot-dip, carburizing, etc.

非金属保护层。如油漆、耐酸水泥、橡胶、塑料、搪瓷等；

Non metallic protective layer. Such as paint, acid resistant cement, rubber, plastic, enamel, etc;

非金属保护膜，在金属表面进行化学处理，生成氧化物膜、磷酸盐膜等保护膜；

The non-metallic protective film is chemically treated on the metal surface to form oxide film, phosphate film and other protective films;

长期稳定性和可靠性是3151智能法兰式液位变送器变送器重要的评判标准。单看变送器的精度，量程和温度/静压影响系数不能完全体现变送器的全部性能，因为这些数据是分散的，每一个数据都不能反映出变送器的综合性能，对于现在的变送器，应该更看重它长期的稳定性和可靠性，用户最需要关心的也应该是这个问题!

Long term stability and reliability are important criteria for 3151 intelligent flange level transmitter. The accuracy, measuring range and temperature / static pressure influence coefficient of the transmitter can not fully reflect the whole performance of the transmitter, because these data are scattered, and each data can not reflect the comprehensive performance of the transmitter. For the current transmitter, we should pay more attention to its long-term stability and reliability, which should be the most concern of the user!

未来，华恒仪表将继续秉承一辈子做好一件事的“工匠华恒仪表将继续辈子做好一件事的“工匠精神”，边生产边科研，研发团队通过在各种不同环境下对仪表进行无数次的试验，不断丰富技术，完善产品性能，将工业自动化仪表做成推动我国工业发展的经济耐用产品，成为国内仪表行业引领者。

In the future, Hua Heng instrument will continue to adhere to the "craftsman spirit" of "craftsman Hua Heng instrument will continue to do one thing well" throughout its life. While producing and researching, the R & D team will continue to enrich technology, improve product performance, and make industrial automation instruments economic and durable to promote China's industrial development by conducting numerous tests on instruments in various environments Products, to become the domestic instrument industry leader.

未来的压力变送器行业肯定是越做越精，一些品牌企业会不断的提升产品的竞争力，完善配套措施的服务，同时会加速开发变送器的附加值产品，丰富产品系列，不再只做某一项的单一产品，增加技能型的功效延伸，方便客户的日常使用，带动整个行业技术标准质的飞跃，使得压力变送器真正进入科技化发展方向。

In the future, the pressure transmitter industry will become more and more sophisticated. Some brand enterprises will continue to improve the competitiveness of products, improve the service of supporting measures, accelerate the development of value-added products of transmitters, enrich the product series, and no longer only make a single product, increase the function extension of skill type, facilitate the daily use of customers, and drive the quality of technical standards of the whole industry With the rapid development of science and technology, the pressure transmitter has entered the development direction of science and technology.