Explosion Proof Instrumentation (Exd/Exi)

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Brief Description

Explosion Proof Instrumentation refers to devices certified for use in hazardous areas where flammable gases, vapors, or dust may be present, ensuring they cannot initiate an explosion.

In-depth Overview

Protecting personnel and equipment in chemical plants, refineries, and mines is achieved through specialized techniques. Explosion-Proof (Exd) enclosures are designed to contain an internal explosion and prevent the flame from propagating outside. Intrinsically Safe (Exi) devices limit the electrical and thermal energy to a level so low that ignition cannot occur, even under fault conditions. Our range includes certified pressure transmitters and temperature sensors built to global standards (ATEX, IECEx) and marked with the required classification (e.g., Zone 1, Zone 2, Class 1 Div 1) for safe deployment in volatile atmospheres.

Specification

Parameter	Details
Protection Method	Ex d (Flameproof) or Ex i (Intrinsically Safe)
Certification	ATEX (Europe), IECEx (International), FM/CSA (North America)
Hazardous Zone	Zone 0, 1, 2 (Gas); Zone 20, 21, 22 (Dust)
Enclosure Material	Heavy-duty Aluminium or Stainless Steel 316L
Temperature Class	T1 to T6 (Maximum surface temperature)
Instrument Types	Transmitters, RTDs, Thermocouples, Indicators
Cable Gland	Certified Ex d or Ex i barrier glands required
Power Requirements	2-wire or 4-wire systems (with safety barrier for Ex i)

Applications

Oil and Gas Refineries: Pressure and temperature monitoring in distillation columns and cracking units.
Chemical Manufacturing: Level and pressure control in reactor vessels containing flammable liquids or gases.
Grain and Powder Handling: Ex d/Ex i devices used to prevent ignition of combustible dust in silos and mills.
Liquefied Natural Gas (LNG) Terminals: Instruments installed in areas prone to natural gas leaks.

Key Advantages

Guaranteed Safety: Certified construction eliminates the risk of instrument-caused explosions in hazardous areas.
Global Compliance: IECEx and ATEX certifications ensure worldwide acceptance for large-scale projects.
High Durability: Robust, heavy-duty enclosures (especially Ex d) offer superior mechanical protection.
Wide Range of Protection: Covers all classes of flammable substances, including gases, vapors, and dusts.

Payment and Shipping

We accept secured international payments including T/T and L/C. Ex-rated instruments are highly specialized and often configured to order; lead times are typically 4−6 weeks. All shipments include the original certification documents and safety manuals. We ensure the specialized cable entry ports are protected to maintain the flameproof path during transit.

Frequently Asked Questions

Q: What is the main difference between Ex d (Flameproof) and Ex i (Intrinsically Safe)?
A: Ex d contains the explosion (preventing propagation). Ex i prevents the explosion by limiting the energy available to the device to below the minimum ignition energy of the surrounding atmosphere. Ex i is generally easier to maintain as it doesn't require complex flameproof cable glands.

Q: What does the T-Class rating (e.g., T4) mean?
A: The T-Class specifies the maximum surface temperature the instrument can reach. T4 means the max surface temperature is 135∘C. This is critical because it must be below the auto-ignition temperature of the hazardous gas present in the area.

Q: Are pressure gauges required to be Ex-certified?
A: Mechanical pressure gauges without electrical components generally do not require electrical Ex-certification. However, the diaphragm seal assembly or the gauge case itself may need to meet certain standards for non-electrical equipment in hazardous areas (EN13463).

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Explosion Proof Instrumentation (Exd/Exi) Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.