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.
Diaphragm Seal Connection Mismatch: Thread & Flange Guide
In this article, a diaphragm seal means the device installed between a pressure gauge and the process medium.
Pressure Gauge NPT vs PT vs G Threads: Differences and Sealing Methods
NPT, PT/R and G/BSPP pressure gauge threads can look similar but differ in taper, pitch and sealing method. This guide compares the standards and explains how to avoid leaks, cross-threading and damaged connections.
Why Is My Pressure Gauge Pointer Vibrating? Can a Liquid-Filled Pressure Gauge Help?
A vibrating pressure gauge pointer is often caused by equipment vibration, pressure pulsation, or an unsuitable range. Learn how a liquid-filled pressure gauge can help and what to check next.
What is an Explosion-Proof Pressure Transmitter? A Comprehensive Guide to Key Technologies and Applications
How to Choose the Right Pressure Transmitter for a Specific Application? A pressure transmitter is a widely used industrial sensing device designed to measure the pressure of gases, liquids, or steam and convert it into a standard electrical signal (e.g., 4-20mA, 0-10V).However, different working environments impose di
Introduction to Frequently Used Thread Standards for Industrial Instruments: Four Steps to Identify Thread Specifications!
Are you confused by industry terms such as “thread,” “screw thread,” “connection,” or “fitting,” as well as the wide range of specifications available?
Types of Industrial Thermometers and How to Choose the Right One
There are many different types of thermometers for industrial applications, with different working principles and uses.
Corrosion Resistance Chart for Pressure Gauge with Metal Connectors
Disclaimer:The information provided in this article is intended for general reference only.
Understanding DIN Flange Standards: PN Ratings and Pressure-Gauge Diaphragm Seal Selection
Learn DIN and EN flange markings, DN and PN ratings, dimensions, and diaphragm-seal selection for pressure-gauge applications.
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.