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Industrial Automation Digital Pressure Gauge With Remote Communication
A pressure gauge is a device used to measure the pressure of fluids (liquids, gases, or steam) and is widely applied in industrial production, energy transmission, medical equipment, and other fields.
Working Principle
The pressure gauge measures pressure by the elastic deformation of the sensitive element (Bourdon tube, diaphragm, or bellows) inside the gauge. The pressure deformation is then transmitted to the pointer through the conversion mechanism in the gauge's movement, causing the pointer to rotate and display the pressure. The pressure can also be converted into mechanical or electrical signals for output.
Main Types and Characteristics
Classification Criteria
Types
Features and Application Scenarios
By Display Method
Mechanical Pointer Type
Intuitive and easy to read, no power required, suitable for high-temperature and strong vibration environments (such as chemical reaction vessels, hydraulic systems).
Digital Type
High precision (±0.1%FS), supports remote communication (4-20mA, RS485), suitable for industrial automation and precise measurement (such as semiconductor clean rooms).
By Measurement Reference
Gauge Pressure Gauge
Measures pressure above or below atmospheric pressure with atmospheric pressure as the reference (such as pipeline pressure).
Absolute Pressure Gauge
Measures pressure with absolute vacuum as the reference, used in vacuum coating, aerospace, and other fields.
Differential Pressure Gauge
Measures the pressure difference between two points, commonly used in flow monitoring and filtration systems.
By Functional Characteristics
Vibration-resistant Type
Oil-filled design (such as glycerin), reduces vibration interference, suitable for pulsating environments such as compressor and pump outlets.
Explosion-proof Type
Meets Ex certification, used in flammable and explosive environments (such as oil refineries, coal mines).
Diaphragm Type
Isolates corrosive media, diaphragm material options include PTFE and Hastelloy, used in chemical and pharmaceutical industries.
By Special Purposes
Oxygen Pressure Gauge
Oil-free treatment to prevent explosion, used in medical oxygen supply and industrial oxygen pipelines.
Ammonia Pressure Gauge
Spring tube made of carbon steel or stainless steel (to avoid reaction between copper alloys and ammonia), used in refrigeration systems.
Core Parameters and Selection Principles
1. Key Parameters
Range: The working pressure should be within 1/3 to 2/3 of the range to avoid overpressure or low-precision measurement. For instance, under stable pressure, the maximum working pressure should not exceed 2/3 of the range, and for pulsating pressure, it should not exceed 1/2.
Accuracy Class: For general industrial applications, 1.6 or 2.5 class can be selected. For laboratory or medical equipment, high-precision gauges with accuracy classes of 0.1 to 0.4 are required.
Material: Choose based on the characteristics of the medium. For example, stainless steel is suitable for corrosive media, while copper alloys are not suitable for ammonia.
Environmental Adaptability: Consider factors such as temperature range (-40℃ to 70℃), vibration resistance level (e.g., V.H.4), and protection level (IP65/IP67).
2. Key Points for Selection
Medium Characteristics: Diaphragm gauges should be chosen for corrosive media, heat sinks should be added for high-temperature media, and throttling valves should be used for viscous liquids to buffer.
Functional Requirements: Digital gauges should be selected for remote monitoring, electrical contact gauges for alarm linkage, and Ex-certified gauges for explosion-proof environments.
Installation Methods: Edgeless gauges should be chosen for direct pipeline installation, gauges with edges for wall installation, and gauges should be matched with structures for embedded installation.
Application fields:
Industrial production: Monitoring the pressure of reaction vessels in petrochemicals, controlling the water level of boilers in the power industry, and regulating the pressure of furnace bodies in metallurgy.
Energy transmission: Monitoring the pressure of oil and gas pipelines, controlling the flow of heat networks, and high-pressure measurement (0-100MPa) in hydrogen refueling stations.
Medical equipment: Regulating the pressure of ventilators, controlling the negative pressure of vacuum blood collection tubes, and calibrating the accuracy of blood gas analyzers.
Daily life: Detecting the air pressure of car tires, monitoring the refrigerant pressure of HVAC systems, and providing safety warnings for household gas meters.
Installation and Maintenance Specifications
1. Installation Requirements
Location Selection: Avoid vibration sources, stay away from high temperatures (install heat dissipation tubes if necessary), be easily observable, and free from electromagnetic interference.
Direction and Sealing: Install vertically (except for special models), use sealing tape on threaded interfaces, and apply double sealing for corrosive media.
Buffer Protection: Install dampers or buffer tubes in pulsating pressure scenarios, and install pressure relief valves in high-pressure scenarios.
2. Maintenance Points
Regular Calibration: Once every six months under normal conditions and once every three months in critical safety situations. After calibration, it should be sealed with a lead seal.
Cleaning and Maintenance: Clear blockages at the interfaces, check if the pointer returns to zero, and prevent moisture and rust in humid environments.
Safety Inspection: Oil-proof treatment for oxygen gauges, regular inspection of sealing parts for explosion-proof gauges, and immediate replacement if leakage is found.
