Pressure Transmitter

1. Introduction In demanding industrial environments—characterized by high temperature, high pressure, strong corrosiveness, or crystallizing media—diaphragm-sealed pressure transmitters act as a critical safety and accuracy barrier. However, many users face performance failures due to subtle but crucial configuration issues, such as: Fill fluid solidifying in cold climates; Excessive capillary length causing slow response; Improper selection […]

1. Evolution of Regulatory Classification 1.1 Early Classification (1981–2016) The earliest relevant regulation dates back to the Safety Supervision Regulation for Pressure Vessels (Labour and Boiler Regulation No. 7 [1981]).Article 80 explicitly classified pressure gauges alongside safety valves as “safety accessories”, requiring periodic verification at least once a year. This classification placed pressure gauges in

1. Introduction Pressure gauges are not universal instruments. Selecting the wrong type for a specific medium can result in corrosion, explosion hazards, or measurement failure. This document explains the selection requirements for pressure gauges used in acetylene, ammonia, oxygen, and hydrogen sulfide-containing media, referencing SH/T 3005-2016 and related international standards. 2. Applicable Standards SH/T 3005-2016

Introduction Pressure gauges are among the most widely used instruments in industrial applications. Like any measurement device, they require periodic calibration to maintain accuracy and ensure safe, reliable operation. At its core, pressure gauge calibration involves applying a known reference pressure and comparing it with the gauge’s reading. The difference between the applied and indicated

Differential pressure transmitters with small measuring ranges are highly sensitive to environmental interference. When installed in wind-exposed areas, strong airflow can create pressure on the negative-pressure port, resulting in inaccurate readings and compromising measurement accuracy. To mitigate the influence of external airflow and environmental fluctuations, it is recommended to install a downward-facing impulse line and

Although their names differ by only one word, capsule pressure gauges and diaphragm pressure gauges are fundamentally different in structure, working principle, applicable media, and usage scenarios. Understanding their distinctions is essential for proper selection and application. ⚙️ 1. Working Principle ● Capsule Pressure Gauge A capsule pressure gauge uses a pressure-sensitive element called a

🛠 Scope of Application This procedure applies to the safe operation of differential or pressure transmitters equipped with a 3-valve manifold (comprising a High-Pressure Valve [H], Low-Pressure Valve [L], and Balance Valve [B]). Correct sequencing is essential to prevent diaphragm damage and ensure accurate pressure readings. ⚙️ Fundamental Principle Always protect the transmitter by using

Have you ever underestimated the seemingly simple yet profoundly significant instrument, the pressure gauge? In the chemical industry, selecting and installing pressure gauges is an intricate science. A suitable pressure gauge not only ensures accurate measurements but also impacts the safety and efficiency of the entire production process. Today, we’ll discuss some details you can’t

Absolute pressure transmitters and vacuum (or negative gauge) pressure transmitters are widely used in industrial applications. The key differences lie in their reference baseline, measurement principle, and application scenarios. Below is a detailed comparison. 1. Definitions and Measurement Principles Type Definition Reference Baseline Measurement Range Absolute Pressure Transmitter Measures the pressure relative to a perfect

Differential pressure (DP) flow meters are widely used in industrial process control. When a DP flow meter shows no indication despite other equipment operating normally, it often signals either a measurement system issue or a process anomaly. This article analyzes two real-world cases and provides a structured troubleshooting guide. ✅ Case Study 1: No Flow