在為3151智能法蘭式液位變送器變送器進行選型時候，有一條說明很引人注目-3151智能法蘭式液位變送器/3051壓力變送器量程比為100:1，一開始還以為這種表示的意思是實際的測量范圍是100，理論的測量范圍是1，這種理解顯然是不正確的。經(jīng)過查閱資料才發(fā)現(xiàn)量程比其實是最大測量范圍和最小測量范圍之比。不是量程比越大變送器的性能就越好

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

說到量程比，先引入一個使用量程的問題。一個測量范圍為0-200kpa的壓力變送器，當(dāng)我們實際測量的壓力為50kpa時，我們選擇的量程應(yīng)為0-100kpa，這個量程就是使用量程。如果量程比是10:1，最小量程是0-25kpa，使用量程是0-20kpa，則變送器的精度就會下降，使用量程在0.50kpa時候，儀表的精度就能夠保證。使用量程和最大量程不能相差太大，否則精度不達標(biāo)。

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.

變送器的好壞不僅僅看量程比和溫度等影響系數(shù)

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

1、合理選擇材料

1. Reasonable selection of materials

有針對性地選擇耐腐蝕金屬或非金屬材料來制造儀表的零部件，是工業(yè)儀表防腐蝕的根本方法。例如用鈦、鉭金屬制作的儀表零件，對氯化學(xué)介質(zhì)有很強的耐腐蝕性；用聚四氟乙烯材料制作的儀表部件和密封墊，也廣泛地應(yīng)用在各種腐蝕介質(zhì)環(huán)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、加保護層

2. Add protective layer

在儀表零件或部件上制成保護層，是工業(yè)中十分普遍的防腐蝕方法。按照保護層的材料和成形原理不同，可分為如下三種：

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:

金屬保護層。包括噴涂、電鍍、熱浸、滲碳等。

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

非金屬保護層。如油漆、耐酸水泥、橡膠、塑料、搪瓷等；

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

非金屬保護膜，在金屬表面進行化學(xué)處理，生成氧化物膜、磷酸鹽膜等保護膜；

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

長期穩(wěn)定性和可靠性是3151智能法蘭式液位變送器變送器重要的評判標(biāo)準。單看變送器的精度，量程和溫度/靜壓影響系數(shù)不能完全體現(xiàn)變送器的全部性能，因為這些數(shù)據(jù)是分散的，每一個數(shù)據(jù)都不能反映出變送器的綜合性能，對于現(xiàn)在的變送器，應(yīng)該更看重它長期的穩(wěn)定性和可靠性，用戶最需要關(guān)心的也應(yīng)該是這個問題!

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!

未來，華恒儀表將繼續(xù)秉承一輩子做好一件事的“工匠華恒儀表將繼續(xù)輩子做好一件事的“工匠精神”，邊生產(chǎn)邊科研，研發(fā)團隊通過在各種不同環(huán)境下對儀表進行無數(shù)次的試驗，不斷豐富技術(shù)，完善產(chǎn)品性能，將工業(yè)自動化儀表做成推動我國工業(yè)發(fā)展的經(jīng)濟耐用產(chǎn)品，成為國內(nèi)儀表行業(yè)引領(lǐng)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.

未來的壓力變送器行業(yè)肯定是越做越精，一些品牌企業(yè)會不斷的提升產(chǎn)品的競爭力，完善配套措施的服務(wù)，同時會加速開發(fā)變送器的附加值產(chǎn)品，豐富產(chǎn)品系列，不再只做某一項的單一產(chǎn)品，增加技能型的功效延伸，方便客戶的日常使用，帶動整個行業(yè)技術(shù)標(biāo)準質(zhì)的飛躍，使得壓力變送器真正進入科技化發(fā)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.