Development pressure transmitter has undergone four stages: 1, early pressure transmitter works with large displacement Honeywell transmitters, such as mass production of mercury has float type differential pressure gauge and bellows differential pressure transmitters, these transmitters low precision and bulky. 2,20 1950 with higher precision force balanced differential pressure transmitter, but the small force feedback, complex structure, reliability, stability and vibration resistance are poor. 3, the mid-1970s, with the emergence of new technology, new materials, new technology, especially the emergence of the rapid development of electronic technology, compact, simple structure displacement transducer. 4, the rapid development of science and technology 1990s, high measurement accuracy of these transmitters and the gradual development of the intelligent digital signal transmission is more conducive to data collection. Differential pressure transmitter calibration routine: first damping to zero state Honeywell transmitters sample, to emphasize zero, then add full scale pressure span adjust the output of 20mA, the adjustment at the scene talking about Fast, in this introduction zero and span of rapid adjustment method. When zero adjustment has little effect on the full-scale Honeywell transmitters, but when adjusted for full-scale zero impact, without migration when the impact is about 1/5 of the amount of the adjustment range, that range upward adjustment 1mA, Zero will move up to about 0.2mA Honeywell transmitter model, and vice versa. For example: Enter the full scale pressure 100Kpa, the reading of 19.900mA, span adjustment potentiometer allows output 19.900+ (20.000-19.900) × 1.25 = 20.025mA range, add 0.125mA, the zero increase 1/5 × 0.125 = 0.025 zero adjustment potentiometer allows output 20.000mA. zero and span adjustment is normal, then check the middle of each of the scale, to see whether the ultra-poor? fine-tuning if necessary. Then adjust work migration, linear damping. Honeywell transmitter maintenance _ Hua Hui Technology (online consultation) _ Honeywell transmitter provided by the Jinan-Technology Co., Ltd. Jinan Huahui Technology Co., Ltd. (www.cnhuahui.com/) Shandong Jinan, pressure meters leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. - Technology leader in China with the staff warmly welcome all inquiries negotiations to create Hua Hui Technology better future.