Explosion-proof Diffused Silicon Sensor
Overview
The Explosion-proof Diffused Silicon Sensor is engineered for reliable pressure measurement in potentially explosive atmospheres. Combining diffusion silicon technology with robust explosion-proof enclosures, these sensors meet stringent safety standards like ATEX and IECEx. They are essential components in industries where flammable gases, vapors, or dust may be present. Unlike standard pressure sensors, explosion-proof models incorporate flameproof or intrinsically safe designs to prevent ignition. The diffusion silicon sensing element provides excellent stability and accuracy, while the stainless steel housing ensures durability in harsh industrial environments.
Structure and Working Principle
The sensor consists of three main components: a diffusion silicon sensing chip, signal conditioning circuitry, and an explosion-proof housing. The silicon chip undergoes piezoresistive changes when subjected to pressure, converting mechanical stress into electrical signals. These signals are then processed by onboard electronics. The explosion-proof protection is achieved through multiple methods: flameproof enclosures contain any potential internal explosion, while intrinsically safe designs limit electrical energy to non-incendive levels. The housing typically features threaded process connections (G1/2" or NPT) and explosion-proof cable entries to maintain the integrity of the protective system.
Key Features
Explosion-proof certification (ATEX, IECEx) is the defining feature, with protection levels like Ex d (flameproof) or Ex ia (intrinsic safety). The sensors offer high accuracy (±0.1% to ±0.5% FS) across wide temperature ranges (-40°C to +125°C). Advanced models include features like digital output (RS485, HART), LCD displays, and programmable ranges. The diffusion silicon technology provides excellent long-term stability with minimal drift. Corrosion-resistant materials (316L stainless steel, Hastelloy) are available for aggressive media applications.
Application Areas
Primary applications include oil and gas facilities (wellheads, refineries), chemical processing plants, and pharmaceutical production. They monitor pipeline pressures, tank levels, and process pressures in Zone 1/Zone 2 hazardous areas. Mining operations use these sensors for hydraulic systems in explosive dust environments. Other applications include offshore platforms, biogas plants, and any industrial process handling flammable substances. The sensors are compatible with liquids, gases, and some viscous media when properly configured.
Maintenance and Precautions
Regular inspection should verify the integrity of explosion-proof seals and cable entries. Never open the housing in hazardous areas - all maintenance must be performed in safe zones. Check for corrosion or damage to process connections that could compromise safety. Calibration should be performed annually or per manufacturer recommendations. Use only replacement parts specified by the OEM to maintain certification. During installation, ensure proper grounding and follow the Ex marking requirements for the specific hazardous area classification.
B2B Procurement Guide
When sourcing these sensors, verify the required explosion-proof certification matches your regional standards (ATEX for EU, IECEx for international, NEC for North America). Specify the pressure range with appropriate overpressure capability (typically 2-3x full scale). Consider process connections (thread type, size), electrical output (4-20mA, voltage, digital), and media compatibility. Lead times for certified sensors can be 4-8 weeks. For large projects, request third-party certification documents and factory test reports. Prices vary significantly based on certification level and materials - request quotations from multiple suppliers for comparison.
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