The electrical contact pressure gauge is a precision instrument that combines pressure indication and control functions, with its core feature being the automatic control or alarm triggered by the pointer activating built-in electrical contacts. Below is a detailed analysis of its main characteristics and application scenarios:
1. Core Features
Dual function
Pressure Display: Real-time pressure values (e.g., MPa, bar, psi) are visually indicated by a pointer.
Electrical contact control: The dial features adjustable upper/lower limit contacts (typically magnetic-aided or mechanical), which trigger circuit connection/disconnection when the pointer reaches the set position.
Adjustable contact point
Users can rotate the setting needle on the dial using a dedicated tool (such as a screwdriver) to flexibly adjust the pressure threshold for alarms or control, adapting to different working conditions.
High precision and stability
The use of sensitive elements such as Bourdon tubes or diaphragms ensures measurement accuracy (typically ±1.5% FS). The contact actuation exhibits excellent repeatability and resistance to vibration interference.
Multiple contact configurations
Single contact (only upper or lower limit alarm), dual contact (simultaneous upper and lower limit control), multiple contacts (multi-channel control), with some models supporting free combination of normally open/normally closed contacts.
Safety Protection Design
The explosion-proof model is suitable for flammable and explosive environments (e.g., Ex d IIC T6); the contact part is sealed and dustproof to prevent arc-induced failures.
2. Typical Application Scenarios
Industrial process control
Pump/Compressor Start-Stop Control: The pump automatically starts when the pipeline pressure falls below the lower limit and stops when it reaches the upper limit, protecting the equipment and saving energy.
Boilers and Pressure Vessels: Monitor steam or water pressure, triggering audible and visual alarms or activating safety valves in case of overpressure.
Hydraulic and Pneumatic Systems
Pressure monitoring of hydraulic stations for equipment such as injection molding machines and machine tools to ensure stable operation of actuators.
Maintain the pressure in the air compressor air tank to avoid frequent start-stop cycles.
Building and Municipal Engineering
Fire pump system: Monitors pipeline network pressure to ensure firefighting water supply is always ready.
Water Supply Boosting System: Automatically adjusts the operation of the water pump based on water pressure to achieve constant-pressure water supply.
Energy and Environmental Protection
Pipeline pressure monitoring for oil and gas transmission, with automatic valve closure in case of leaks.
Wind pressure control in sewage treatment aeration tanks to optimize energy consumption.
Laboratory and Test Bench
Set the pressure cycle range in the durability test and automatically record the number of on-off cycles.
3. Selection Considerations
Medium compatibility: For corrosive fluids, stainless steel or fluoroplastic diaphragm types should be selected.
Contact capacity: Select relays or directly drive contactors based on the load current (typically AC 380V/220V, 0.5A-10A).
Environmental conditions: Outdoor or humid environments require an IP65 or higher protection rating.
Certification requirements: Compliance with standards such as ASME, CE, and SIL is mandatory when involving safety monitoring.
Hongqi Instrument Co., Ltd. was established in 1993 and is a modern technology-based enterprise specializing in the research and development, production, sales, and service of pressure and temperature instruments. Located in "the Taihu Lake Lake Wangxian County" Zhejiang Changxing Economic Development Zone, it has two major production bases, Wenzhou and Changxing. The company covers an area of 50000 square meters and has over 1000 employees. Our products cover the whole country, with 21 offices and hundreds of agents; At the same time, the products are exported to dozens of countries and regions such as Europe, America, the Middle East, and East Asia.
Since its establishment, the company has always adhered to the principle of being the foundation and technological innovation as the driving force for development. There are currently 17 production workshops, 1 mold processing center, 1 provincial-level enterprise technology center, and 1 central laboratory. Strong technical strength and strong technological innovation capability. After more than 30 years of development, it has become a leading enterprise in the national instrument manufacturing industry.
Professional manufacturer
We have over 30 years of production experience in products such as pressure gauges, thermometers, and pressure reducers. We have over 70000 square meters of modern standard factory buildings, 17 workshops, and two central laboratories. There are currently over 1000 employees. Design and produce the core components of pressure gauges: Bourdon tube, movement, connector, case, dial, and related accessories. With strong production capacity and modern production lines, we can meet your different requirements, with a monthly production capacity of over 1.2 million pieces. We have a team of experts including 5 senior engineers and 15 engineers. At present, we have dozens of invention patents, design patents, and utility model patents. A 100000 level clean workshop used for producing food and medical pressure gauges. Our emphasis on product quality and customer service has made us increasingly popular, becoming the preferred supplier in China and around the world.
Strictly inspect for excellent quality
We are the only manufacturer in China that participated in the drafting of the National Pressure Gauge Verification Regulation as an enterprise, the exemplary organization of the China Institute of Metrology, the unit of the National Pressure Gauge Standards Committee, the small giant enterprise specializing in special and new technologies, high-tech enterprises, China's well-known trademarks, and so on. To ensure the reliability, accuracy, and durability of our products, we strictly control every production process. In the process of achieving sustainable development, pay attention to quality management and continuously develop products. The company has obtained IS09 0 01:20 08, S014001:2015, S045001:2018, CE, UL, and KS certifications.
Comprehensive service
Our reputation is built on high quality, quick response to customer needs, and excellence in customer service. Committed to providing customers with completely satisfactory service and helping you choose the most suitable product from a professional perspective. We also provide specially designed pressure gauge accessories to help you maximize the functionality of your pressure gauge. Our accessories are designed to help protect our instruments and further ensure their lifespan. And there is a professional team to accompany at every stage of the project's initial development, production, and delivery. We accept OEM and ODM cooperation to provide you with personalized customized instruments.
Welcome to call us to learn more.
URL:https://www.hongqiinstrument.com/
Tel:+86-572-6129996 ; +86-572-6129997; +86-572-6062288
Email:hongqi@cnhongqi.com
