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.

Showing 49–64 of 91 results

Model: MSFZ20~50
Valve Manifold for Pressure Instrument
- Divided into 2-valve manifolds, 3-valve manifolds, and 5-valve manifolds based on the applications
- Shut-off, pressure compensating, purge and vent valves for differential pressure measuring instruments
- Widely used in industries of petroleum, chemical, metallurgical, power, liquid, natural gas, and various conveying pipelines
◼️ Figure 1, 2: MSFZ20, 2-valve manifold
◼️ Figure 3, 4: MSFZ30, 3-valve manifold
◼️ Figure 5, 6: MSFZ50, 5-valve manifold
Model: DIT-CS
Welding Tri-Clamp Diaphragm Seal for Small-size Pipeline Connections
- Special design for small-size pipeline connections
- Enlarging the upper seat and diaphragm can ensure precision and fit different pipeline connections
- Ideal for industries such as petrochemical, chemical equipment construction, sewage treatment, paper, etc.
Model: MXB
Digital Pressure Gauge, LCD Display
- Bar graph display can prevent overpressure
- Data logger helps record the highest and lowest peak values effectively
- Built with the same sensing technology adopted by PCE Deutschland GmbH.
Model: MXP
Digital Pressure Gauge, High Precision
- Accuracy up to 0.025% F.S., ideal for instrument calibration
- Ensured accuracy through calibration using advanced equipment from world-class industry leaders such as Mensor and GE.
- Built-in lithium battery, which allows charging during use (Micro-B)
Model: PRD-700
Digital Pressure Gauge, Master
- Supports multiple pressure types (gauge, absolute, differential, compound) with ranges up to 2500 bar and accuracy options from 0.2% to 0.01%.
- Built with the same sensing technology adopted by UK brand “Ashford Instrumentation”.
- Features a backlit LCD with six-digit, and data logging for up to 1600 records.
Model: PRD-S280C
Digital Pressure Gauge, Data logger
- Supports automatic pressure data logging with adjustable intervals from 1 to 3,600 seconds.
- Built-in large-capacity memory that stores up to 10,000 historical data entries.
- Equipped with a Micro-B interface and dedicated software, allowing for quick export of data in xls format to a computer.
Model: MXE4
Digital Pressure Gauge, Electronic Contact
- Precisely set value to efficiently avoid incorrect signals from pointer vibration
- Easily set the pressure switch values on the site
- Various operating voltage settings and switch contacts to support different applications
Model: MXT
Digital Pressure Gauge, Display and Output Signal
- 4-20mA signal output for remote monitoring
- Digital display which allows local observation at the same time
- LED digital panel with high brightness and a wide viewing angle
Model: PRD-FEF
Digital Pressure Gauge, RS485 Output Signal
- RS-485 output signal, for remote monitoring
- LCD panel displays data instantly
- Pressure measurement range from 0 … 10 kPa to 0 … 1000 kg/cm2
Model: PRD-APP
Digital Pressure Gauge with Anti-corrosion Plastic Case, Multi-Ouput Signal
- 4-20mA or RS485 signal output for remote observation
- Digital display which allows local observation at the same time
- Corrosion resistance on both case and wetted part, mainly used in the PCB industry
Model: PRD-DP
Digital Pressure Gauge, Double-sided LCD Display Screen
- Double-sided display facilitating observation and operation
- LCD monitor with backlight, beneficial to long-term monitoring
- Corrosion resistance on both case and wetted part, generally used in the PCB industry
Model: DRM108
Digital Pressure Gauge, Analog Signal Output, Differential Pressure transducer
- Analog output 4-20mA for remote monitoring
- Limited to non-corrosive gases
- Usually used in filter, fan and duct pressure monitoring in building automation systems in the HVAC
- For RS-485 output signal please refer to TWM11
Model: TWM11
Digital Pressure Gauge, Multi-purpose Low/Differential Pressure Transmitter
- On-site customizable units and range for specific scales
- LCD backlight display, beneficial for long-term monitoring
- Limited to non-flammable and non-corrosive gases
- Usually used in filter, fan and duct pressure monitoring for building automation systems in the HVAC industry
Model: TWM30
Digital Pressure Gauge, Multi-Output Signal
- Support multiple working modes
- Buit-in buzzer with sound-light alarm, field programmable alarm pressure value
- Used to measure fan and blower pressure, filter resistance, medical equipment, etc
Model: PRD-TG
Digital Pressure Gauge, Basic
- Cost-effective digital pressure gauge with a short lead time
- Intuitive interface for easy operation
- For gaseous and liquid pressure media that are not highly viscous or crystallizing
Model: PRDR.W
Stainless Steel Pressure Gauge, Laser Welding
- Integrally formed without any seams to avoid leakage effectively
- Vent valve and blow-out device (plug) for improved safety
- Used in the petrochemical industry, power engineering, and sewage treatment
- Same specifications as WIKA-232.50/233.50