Introduction

Under the harsh operating conditions of the petrochemical industry, the PTS702Q-400M-MA-C-M20 pressure transmitter, with its high-precision diffused silicon sensing technology, has become a key device for process control. This article provides an in-depth analysis of 5 typical application scenarios of this model in petrochemical production, offering selection reference for technical evaluation personnel.

I. Reactor Pressure Monitoring System in Refining Units

In the refining process, pressure fluctuations inside the reactor directly affect catalytic cracking efficiency and safety. The PTS702Q-400M-MA-C-M20 pressure transmitter achieves precise monitoring through the following technical advantages:

• Hydrogen sulfide corrosion-resistant design: Using a 316L stainless steel isolation diaphragm and special sealing process, it can withstand harsh environments with H₂S concentrations up to 500ppm
• 0.1%FS high accuracy: Based on a diffused silicon sensing element, it can detect slight pressure changes within the 0-40MPa range, ensuring stable reaction conditions
• M20×1.5 threaded connection: Directly installed on the reactor pressure pipeline, avoiding leakage risks caused by traditional flange connections

A case study at a large refinery shows that after this model replaced the original capacitive transmitter, the annual failure rate was reduced by 67%, and seamless integration with the DCS system was achieved through 4-20mA+HART protocol output.

II. Pressure Protection for Ethylene Cracking Furnace Tubes

Sharp pressure rise in cracking furnace tubes is a major risk leading to equipment damage. The PTS702Q series ensures safety through a triple protection mechanism:

Actual operating data show that this device successfully provided early warning of 3 pressure abnormal events in the cracking unit of a petrochemical base in Guangdong, avoiding direct economic losses exceeding 2 million yuan.

III. LNG Storage Tank Leak Monitoring

In response to the cryogenic characteristics of LNG at -162℃, the PTS702Q-400M-MA-C-M20 is specially configured with:

1. Cryogenic-specific silicone oil filling technology to prevent medium crystallization
2. Explosion-proof certification: Ex d IIC T6 Gb
3. IP68 protection rating, suitable for coastal high-humidity environments

In the Zhoushan LNG receiving station project, a safety monitoring network composed of 18 transmitters of this model achieved real-time wireless transmission of storage tank pressure data, with measurement error less than ±0.05%FS.

IV. Slurry Pump Control on PTA Production Lines

High-pressure slurry pumps in purified terephthalic acid (PTA) production require precise control of outlet pressure. The unique value of this model lies in:

• Ceramic piezoresistive sensor chip resistant to erosion by solid particles
• MA-grade process connection prevents acid corrosion
• Optional DN50 flange installation, adaptable to various pump body interfaces

Comparative tests with the AST-C1000 pressure transmitter show that under operating conditions of 80℃ and 6MPa, the long-term stability error of the PTS702Q is only 1/3 of the former.

V. Differential Pressure Measurement in Sulfur Recovery Units

In the Claus process, the differential pressure transmitter combination enables:

1. Monitoring of reactor bed pressure drop
2. Flow calculation for tail gas treatment systems
3. Optimized control of combustion furnace air distribution

A project in Xinjiang used two PTS702Q units to build a differential pressure measurement system, combined with the ZY800-V1-B1-C1-J1P1 pressure transmitter to form a redundant configuration, achieving continuous operation for 18 months without impulse line blockage.

Summary and Technical Services

As a professional manufacturer of diffused silicon liquid and gas pressure sensors, the PTS702Q series of Xi'an Shenghongchuang Instrumentation Co., Ltd. has passed:

• Certification by the National Quality Supervision and Inspection Center for Explosion-Proof Electrical Products
• ISO9001:2015 quality management system
• CE/RoHS dual-directive declaration of conformity

Our technical team can provide full lifecycle services covering: operating condition analysis→selection recommendations→installation guidance→after-sales maintenance. Contact an engineer now to obtain customized solutions, or request technical white papers for product series such as DG1300-BZ-A-2-210/CJ/GZ.