Explosion Proof Submersible Level Transmitter with Exia IIC T6 Certification for Hazardous Areas

Fuel storage tanks, chemical basins and refinery sumps sit in hazardous areas where every electrical instrument must be intrinsically safe. This explosion proof submersible level transmitter carries Exia IIC T6 certification, combining a corrosion-resistant submersible probe with 4-20mA output for level measurement in Zone 0 and Zone 1 hazardous locations.

Why Do You Need an Explosion Proof Submersible Level Transmitter?

Hazardous areas are defined by the presence of flammable gases, vapors or liquids, and any electrical device installed there must be certified incapable of igniting the atmosphere. Level measurement in fuel tanks, chemical storage basins and refinery sumps is essential for inventory, safety and leak detection, but standard instruments are not permitted in these zones. An intrinsically safe submersible level transmitter solves this: the Exia IIC T6 certification guarantees that the electrical energy in the probe and its circuit is limited to levels incapable of causing ignition, even under fault conditions, allowing installation in the most demanding hazardous zones including Zone 0. The submersible design measures the level directly in the liquid, and the certified barrier circuit transmits a 4-20mA signal to the safe area. For plants that must measure flammable liquid levels in hazardous areas, this transmitter provides the certified, dependable solution.

Working Principle: Intrinsically Safe Hydrostatic Measurement

The transmitter measures level through the hydrostatic pressure of the liquid column, using a submersible probe fitted with a pressure diaphragm. The probe is lowered into the tank or basin; the pressure on the diaphragm is proportional to the liquid level above it, and the electronics convert this into a level value. The entire electrical circuit is designed and certified to the Exia IIC T6 intrinsic safety standard: the energy available in the circuit is limited by safety barriers to levels that cannot ignite the surrounding atmosphere, even under fault conditions, and the T6 temperature class ensures surface temperatures remain below 85 °C. The 4-20mA signal is transmitted through the certified barrier to instruments in the safe area, allowing continuous level monitoring while maintaining complete safety in the hazardous zone. A vented cable provides atmospheric reference for accurate measurement.

Structural Advantages of the Explosion Proof Transmitter

• Exia IIC T6 certification: intrinsically safe for Zone 0 and Zone 1.
• Submersible probe design: measures directly in the liquid.
• 4-20mA output: standard signal through safety barrier.
• Corrosion-resistant construction: suitable for fuel and chemical service.
• Vented cable reference: accurate, drift-free measurement.
• Certified circuit: energy limited for guaranteed safety.
• No moving parts: low maintenance in continuous duty.
• Rugged sealed probe: reliable in submerged hazardous service.

Selection and Installation Guide

Select the measuring range to match the maximum liquid depth, and confirm the cable length reaches the safe-area termination point. The transmitter must be installed with an approved intrinsic safety barrier between the hazardous area circuit and the safe-area instruments, sized and certified for the transmitter's parameters. The probe is lowered into the tank or basin and secured at the top; the vent opening must remain in the safe area or be protected appropriately. Confirm the area classification, gas group and temperature class of your site match the Exia IIC T6 certification before installation. Our engineers provide certified installation guidance and barrier selection support with every order.

Pain Point Analysis: 4 Challenging Working Conditions

Application Cases

Product Advantages

• Exia IIC T6 intrinsically safe certification
• Suitable for Zone 0 and Zone 1 hazardous areas
• Submersible probe for direct level measurement
• 4-20mA output through certified safety barrier
• Corrosion-resistant construction
• Vented cable for accurate reference
• No moving parts, low maintenance
• Manufacturer-certified configuration support

Technical Parameters

SEO FAQ

Q1: What does Exia IIC T6 certification mean?

Exia is the intrinsic safety protection type, meaning the instrument's electrical energy is limited to levels incapable of igniting the surrounding atmosphere, even under two simultaneous fault conditions. IIC denotes the gas group, covering the most easily ignited gases such as hydrogen and acetylene, which means the certification extends to all less demanding gas groups as well. T6 is the temperature class, limiting the maximum surface temperature to 85 °C, safe for all flammable substances with ignition temperatures above this value. Together, Exia IIC T6 is one of the highest intrinsic safety ratings available, permitting installation in Zone 0, where explosive atmospheres are continuously present, and Zone 1, where they occur occasionally.

Q2: Where can this transmitter be installed?

The transmitter can be installed in hazardous areas classified Zone 0 and Zone 1, where flammable gases, vapors or liquids are present continuously or occasionally. Typical applications include fuel storage tanks, chemical basins, refinery sumps, solvent collection pits and other locations handling flammable liquids in petrochemical, chemical, fuel distribution and pharmaceutical plants. The Exia IIC T6 rating covers essentially all industrial flammable substances. The transmitter must be used with an approved intrinsic safety barrier in the safe area, and the installation must follow the certified parameters and wiring requirements. Confirm your site's area classification with your safety department before installation.

Q3: How does intrinsic safety protect against ignition?

Intrinsic safety protects by limiting energy rather than containing an explosion. The transmitter's circuit is designed so that the electrical energy available at any point, including under fault conditions, is below the minimum energy required to ignite the most easily ignitable gas in the atmosphere. This is achieved through current and voltage limiting by safety barriers located in the safe area, which restrict the energy delivered to the hazardous area circuit. Because the energy is inherently insufficient to cause ignition, the instrument is safe in the hazardous zone without heavy flameproof enclosures. This approach is particularly suited to low-power instruments like level transmitters, and it allows maintenance and adjustment in the hazardous area under certified conditions.

Q4: What is the role of the safety barrier?

The safety barrier is an essential part of the intrinsically safe system, installed in the safe area between the hazardous-area circuit and the control instruments. It limits the voltage and current that can reach the hazardous area, ensuring that under normal and fault conditions the energy in the hazardous area circuit stays below the ignition threshold. The barrier is selected to match the transmitter's certified parameters, including maximum voltage, current and capacitance, and it is certified as part of the overall intrinsic safety loop. Correct barrier selection and wiring are critical for safety and certification compliance, and our engineers provide barrier selection guidance with every certified order.

Q5: Can the transmitter measure corrosive liquids?

Yes. The standard probe is constructed from 316L stainless steel, which resists corrosion in fuel, water and many chemical liquids. For more aggressive media, the probe can be supplied with enhanced materials and protective options to suit the specific chemical, its concentration and temperature. The submersible design also allows the probe to be protected by installation arrangements that suit the basin or tank. When ordering, describe your liquid and its properties so our engineers can confirm the correct material configuration, ensuring long service life in your specific hazardous-area application while maintaining the certified safety performance.

Q6: What support and certification documentation do you offer?

As the manufacturer, we provide the certification documentation for the Exia IIC T6 rating, together with the certified electrical parameters required for barrier selection. Our engineers support the complete process: range selection, cable length, material selection, barrier selection and installation guidance. Customization options include measuring range, cable length, probe material, output configuration, labeling and packaging, plus OEM and ODM programs. Every transmitter is factory-calibrated and tested before shipment. Contact us with your area classification, liquid properties and system requirements for a certified, tailored solution.

Why Choose Our Explosion Proof Submersible Level Transmitter?

Hazardous areas demand instruments that are certified, and level data in flammable liquids demands sensors that are dependable. This transmitter delivers both: Exia IIC T6 intrinsic safety for Zone 0 and Zone 1, a corrosion-resistant submersible probe for direct measurement, and a 4-20mA signal that crosses the safety barrier to your control system. As the manufacturer, you receive certification documentation, barrier selection support and application-matched configuration. When the liquid is flammable and the level must be known, choose the intrinsically safe transmitter that measures without risk.