Catex (ATEX) Centrifugal Pumps for Explosive Atmospheres

What the certification covers

Pump with Catex certificate for explosive atmospheres.
Zone 1 or 2 (Category 2 or 3) installation.
Temperature class T3, T4 or T5.
Flameproof motor II 2G Exd IIC T5.
Single or double Catex certified mechanical seal — the seal is part of the certification, not an accessory.

Construction details that matter on this duty

Very solid design to ensure maximum safety and durability.
Body-flange formed by microfusion, with the cold-stamped suction cover joined by screws — a stiff, dimensionally stable casing that holds alignment.
High hydraulic output from a semi-open impeller produced by microfusion techniques.
GAS, DIN 11851 or DIN 2633 flange connections.
Brushed matt finish and stainless steel baseplate.

Technical specifications

These are the published figures for the pump family; confirm the exact model against your duty point, since flow, head and power are linked on the curve.

Typical applications

Alcohols, liquors, water, wine, beer, brine, acids, glycols, solvents, hydrocarbons and similar low to medium viscosity liquids — with the additional constraint that the surrounding area is classified. Solvent transfer, fuel and oil handling, and chemical duties in classified areas are the usual cases.

Before you specify — the four things we ask

1. Zone and category (Zone 1 or 2, Category 2 or 3) and the gas group. 2. Temperature class required (T3, T4 or T5). 3. The fluid — concentration, temperature, and whether a barrier fluid is acceptable. 4. The duty point — flow and differential head, not just "a pump for this tank".

With those four we can confirm pump, seal and motor as a certified package rather than three separately certified parts.

Frequently asked questions

Is the mechanical seal included in the ATEX certification?

Yes. The seal is available single or double and Catex certified — it forms part of the certified assembly, not a separate item.

Which temperature class can be supplied?

T3, T4 or T5, depending on the model and motor selected. Tell us the class required and we will confirm the matching build.

Can a standard centrifugal pump be used in Zone 1 if it has an Exd motor?

No. Pump, seal and motor must all be suitable and certified for the zone and temperature class — that is the point of a Catex-certified package.

Which flange standards are available?

GAS, DIN 11851 or DIN 2633 connections, with a brushed matt finish and stainless steel baseplate.

Can the pump handle higher viscosity product?

Up to 500 cP at the published rating. Above that a positive displacement pump is normally the better answer — see our progressive cavity and triple screw ranges.