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.
Thermometer Insertion Depth: How Long Should the Stem Be?
How deep should an industrial thermometer stem be inserted? There is no single length that works for every pipe or vessel.
Diaphragm Seal Material Selection: Is 316L Always Suitable?
Choosing a diaphragm seal material starts with the process fluid, not simply the word “stainless.” The diaphragm and other wetted parts must withstand the medium throughout normal operation, temperature excursions and cleaning.
Pressure Gauge Leaking After Installation? 5 Connection Checks
A pressure gauge leaking gas or liquid after installation does not necessarily have a faulty measuring element.
Pressure Gauge Fogging Up? Can Liquid-Filled Gauges Help?
When a pressure gauge fogs up, first identify whether the moisture is outside or inside the window.
Why Is Your Industrial Thermometer Slow to Respond? 5 Causes and Solutions
When equipment heats up, the thermometer pointer may take time to follow. During cooling, the reading may also remain high for a while.
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
Industrial thermometer readings can vary because of insertion depth, installation position, response time, thermowell effects, or calibration drift.
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.