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 Leaking After Installation? Locate the Leak First
A leak after installation can make it tempting to tighten the connection immediately.
Same 1/4-Inch Thread—Why Won’t the Pressure Gauge Fit?
A pressure gauge and a pipe fitting may both be marked “1/4 inch,” but that does not mean they can be installed together.
Why Do Pressure Gauges Fail So Often? Vibration May Be Shortening Their Service Life
Pressure gauges may fail from vibration, pulsation, overpressure, or poor range selection. Learn when a liquid-filled gauge can reduce wear.
Industrial Thermometer Reading Inaccurate? Check Insertion Depth and Installation Position
A reading difference between an industrial thermometer and a PLC, temperature transmitter, or handheld instrument does not necessarily mean the thermometer has failed.
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.