Pressure Instruments

SJ Gauge specializes in a wide range of professional pressure measurement instruments, including digital pressure gauges, differential pressure gauges, stainless steel mechanical gauges, and pressure transmitters. Our products are manufactured under strict quality control standards and are designed to meet diverse industrial and scientific applications. With a comprehensive product portfolio and reliable after-sales service, we ensure long-term performance and peace of mind for our customers.

We offer flexible customization services tailored to your specific requirements. From pressure gauges to transmitters, each product can be engineered to match your exact application needs. Whether for large-scale industrial procurement or low-volume customized orders without minimum quantity limitations, SJ Gauge provides fast response and efficient solutions. We understand the complexity of different operating environments and are committed to transforming your requirements into precise and reliable measurement solutions. For any customization inquiries, please feel free to contact us.

Pressure Instruments FAQ

Selection questions for pressure gauges, transmitters, switches, diaphragm seals, and pressure accessories.

How should I choose between a pressure gauge, pressure transmitter, and pressure switch?

Use a pressure gauge when local visual indication is enough, a pressure transmitter when the pressure signal must be sent to a PLC or monitoring system, and a pressure switch when equipment must start, stop, or trigger an alarm at a preset pressure. Many systems combine more than one instrument for local reading, remote monitoring, and control protection.

When is a diaphragm seal needed for pressure instruments?

A diaphragm seal is recommended when the process media is corrosive, viscous, high-temperature, crystallizing, contaminated, or sanitary. It isolates the measuring instrument from direct media contact and helps extend instrument life in chemical, food, pharmaceutical, semiconductor, petrochemical, and wastewater applications.

Which accessories help protect pressure instruments?

Siphon tubes reduce heat from steam service, snubbers damp pressure pulsation, overpressure protectors help prevent overload damage, and manifolds or gauge cocks allow isolation, venting, and maintenance. Accessory selection depends on temperature, vibration, pressure spikes, and maintenance requirements.

Can SJ Gauge customize pressure instruments?

Yes. SJ Gauge can customize pressure range, connection type, wetted material, mounting direction, electrical output, alarm contact, dial size, diaphragm seal, capillary, and accessory combinations based on the application environment.

Pressure Sensors (Transducers/Transmitters) (17)
An intelligent pressure transmitter is a highly precise pressure measurement device equipped with digital functionality. It converts measured pressure values into standard electrical signals (such as 4–20 mA) or digital signals, and supports various communication protocols including HART and Modbus.
This device is widely used in automation control systems, especially in industrial environments that require remote monitoring and high accuracy. If you would like to learn more about specific models or require product customization, please provide your detailed requirements, and we will offer tailored recommendations.
Digital Pressure Gauges (13)
Compared with traditional analog pressure gauges, digital pressure gauges offer a wider range of signal outputs and remote transmission capabilities, allowing users to monitor pressure readings from a distance more efficiently.Depending on application requirements, specifications such as large displays, high accuracy, digital contacts, and RS485 communication can be selected. In addition to these standard options, SJ Gauge also provides customized digital pressure gauge solutions tailored to specific operational needs.If you have any special requirements, please feel free to contact us.For more detailed information, please refer to this article: Digital vs Analog Pressure Gauges: Precision & Functional Differences, and a Pros & Cons Comparison
Pressure Gauges (11)
SJ Gauge offers a wide range of pressure gauges, including general and low pressure gauges, for various industrial applications. Material options include 304, 316, and 316L stainless steel, as well as copper alloy. Connection types are available in PT, NPT, and BSP threads, with bottom mount and back mount configurations. Pressure gauges can also be equipped with diaphragm seals for corrosive, high-temperature, or viscous media applications. SJ Gauge also provides product recommendations and customized solutions based on different operating requirements.For more detailed information, please refer to this article: What Are the Internal Structures of Different Mechanical Pressure Gauges? Pressure Gauge Selection Principles: 7 Steps to Selecting a Pressure Gauge
Differential Pressure Gauges (6)
A differential pressure gauge is designed to measure the pressure difference between two pressure points within a system. By monitoring the pressure differential, it helps evaluate flow conditions, filter blockage, liquid levels, or equipment operating status. Differential pressure gauges are widely used in filtration systems, pumps, clean rooms, HVAC systems, and industrial process control applications.
Contact Pressure Gauges (4)
A contact pressure gauge combines pressure measurement and electrical control functions in a single device. While monitoring pressure, it can output electrical signals through its internal contacts. When the pressure reaches the preset upper or lower limit, the contacts automatically actuate to start, stop, or trigger alarms for related equipment, making it an essential component in industrial automation and safety control systems.
Pressure Switches (2)
A pressure switch is a control device that automatically starts or stops equipment based on pressure changes. When the system pressure reaches a preset value, the internal contact mechanism automatically switches and outputs a signal to control pumps, air compressors, valves, or alarm systems. It is widely used in industrial automation and equipment protection applications.
Diaphragm Seals (29)
A diaphragm seal is a protective device installed between the process media and pressure instruments such as pressure gauges, pressure transmitters, or pressure switches. It is designed to isolate viscous, corrosive, high-temperature, or crystallizing media, preventing direct contact with the measuring element and improving operational stability and service life. Diaphragm seals are widely used in food processing, chemical, pharmaceutical, semiconductor, and petrochemical industries.
For more detailed information, please refer to this article: In What Situation Should A Diaphragm Seal Be Integrated to Your Pressure Gauge?
Accessories pressure (8)
SJ Gauge offers a wide range of accessories for pressure gauges and industrial thermometers, including stainless steel siphons, snubbers, cooling elements, gauge cocks, ball valves, overpressure protectors, and manifold valves, which can be selected according to different application requirements.
These accessories help protect instruments, stabilize measurement conditions, and improve heat dissipation, contributing to better system stability and operating efficiency. If you have special specifications or customization requirements, please feel free to contact us.