Knowledge
Welcome to the SJ Gauge Knowledge Center, featuring technical articles and application insights on pressure gauges, thermometers, diaphragm seals, smart transmitters, and industrial measurement instruments.
From selection guides and installation tips to real-world application experiences, we help improve measurement stability, equipment reliability, and overall process efficiency.
Digital vs Analog Pressure Gauges: Precision & Functional Differences, and a Pros & Cons Comparison
Are digital and analog pressure gauges just a reflection of different eras?Pressure gauges play a vital role in both industrial and everyday applications, such as safety monitoring for machinery and pressure regulation in piping systems.
ANSI/ASME Flange Standards Explained: What Class 150 Means
Understand ASME B16.5 and B16.47, Class 150 pressure-temperature ratings, RF, FF and RTJ faces, and flange selection.
Key Safety Points for Installing Pressure Gauges
There are many matters to note on the installation of a pressure gauge. To ensure gauges function properly, avoid damage during installation and have an extended service life, proper installation with the right accessories is necessary.
Pressure Gauge Selection Principles: 7 Steps to Selecting a Pressure Gauge
How do you choose a pressure gauge?To properly select a pressure gauge, you will need to consider the pressure gauge dial size, pressure measuring range (scale range), casing material, process connection, connection location, and more.
Corrosion Resistance Chart for Pressure Gauge with“PP material Connector”
SJ Gauge: The following is a reference table for the corrosion resistance of pressure gauges with "PP (Polypropylene) material" to different chemicals (Test: Immersion time 6 months).
Top Six Common Reasons of Pressure Equipment Failure
SJ Gauge has many years of professional experience in measuring pressure and temperature.
JIS Flange Standards Explained: How to Read 5K, 10K, 16K and 20K
Learn how to read JIS flange ratings including 5K, 10K, 16K and 20K, and select the right flange for pressure instruments.
Corrosion Resistance Chart for Pressure Gauge with “Plastic Material Connector”
SJ Gauge: Pressure gauges or diaphragm pressure gauges, due to their measurement principles, have connectors that come into contact with the pressure source (medium).
In What Situation Should A Diaphragm Seal Be Integrated to Your Pressure Gauge?
Are your pressure gauges often failing, even after they were replaced?The problem may be related to the media (pressure source).
What to Do When Liquid-Filled Pressure Gauges Don’t Work?
Is a liquid-filled pressure gauge right for me?Learn how to troubleshoot common issues with liquid-filled pressure gauges with SJ Gauge's expert guidance in 5 minutes!
What Are the Internal Structures of Different Mechanical Pressure Gauges?
What Are the Internal Structures of Different Mechanical Pressure Gauges?When measuring pressure, different pressure gauges can be selected according to different measuring methods, environments and pressure sources.
Why Can`t a Vacuum Gauge Reach -760 mmHg? How Does a Pressure Gauge Measure Vacuum?
A vacuum gauge is used to measure the vacuum level inside a system. In general, atmospheric pressure is taken as the reference zero point, so under standard atmospheric pressure at sea level, the maximum reading of a vacuum gauge is about -760 mmHg (or -76 cmHg), which represents a near-perfect vacuum condition.