In hazardous environments with flammable and explosive media such as petroleum, chemical, and pharmaceutical industries, the electric sparks or high-temperature surfaces of ordinary electric heaters may cause safety accidents. Explosion proof electric heaters, with their special structural design and safety protection performance, have become indispensable heating equipment in such scenarios.

Key points for selection and safe use

1. Core steps for selection

Step 1: Determine environmental parameters: specify the explosive gas level (IIA/IIB/IIC), temperature group (T1-T6), and protection level requirements (IP54/IP65) for the usage scenario;

Step 2: Calculate heating power: Calculate the required power according to the formula Q=cm Δ t (liquid) or Q=ρ Vc Δ t (gas), where c is the specific heat capacity of the medium, m is the mass, Δ t is the temperature change, and a power margin of 10% -20% should be reserved;

Step 3: Choose the structural form: immersion type is preferred for liquid heating, air duct type for gas heating, and heat tracing system for pipeline insulation;

Step 4: Confirm certification qualifications: Products with "Explosion proof Certificate" and "Inspection Report" must be selected, and imported products must comply with IECEx or ATEX certification.

2. Safe use and maintenance

Installation requirements: Installation must be carried out by personnel with explosion-proof operation qualifications. The grounding resistance of the equipment must be ≤ 4 Ω, and the safe distance from flammable and explosive media must comply with design specifications;

Operation monitoring: Regularly check the temperature control system and the sealing of the explosion-proof shell. If any abnormalities are found (such as sudden temperature rise or abnormal noise), immediately shut down the machine;

Maintenance taboos: It is prohibited to disassemble equipment while it is powered on. During maintenance, the power must be cut off and a "gas detection" must be performed to confirm that there are no flammable gases in the environment before operation;

Life management: The service life of electric heating elements is usually 2000-5000 hours, and they need to be replaced in a timely manner after reaching their service life to avoid short circuits caused by element aging.