Pumps for ATEX zones
Pumps pose a potential source of ignition during operation. The essential sources of ignition are hot surfaces, mechani- cally triggered sparks or electrostatic discharge. SAWA pumps of Categories 2 and 3 are designed to guaran- tee a high level of safety if operated within speci cations.
The SAWA ATEX pumps comply with the ATEX Directives and are allowed for zones 1/21 and 2/22. Running dry must be avoided at all costs since, otherwise, inadmissibly high temperatures may occur within a very short time.
The following measures may be taken to prevent inadmissible operating states (e.g. motor over- load or running dry):
The following measures may be taken to prevent inadmissible operating states (e.g. motor over- load or running dry):
- current-consumption monitoring
- protection against dry running using Liquiphant
- temperature monitoring at the containment shell or at the slide bearings (on pumps with magnetic coupling) or at the mechanical seal
- use of double-acting mechanical seals in tandem or back-to-back arrangement
- Dpressure monitoring at the pressure dis- charge nozzle
- flow monitoring
Optional forms
Category 2 – high safety
ATEX Zone 1 and 21
- bearing housing option with single-acting or double-acting mechanical seal
- magnetic coupling
Category 3 – normal safety
ATEX Zone 2 and 22
The ATEX identi cation of the SAWA pumps is as follows: II 2G cX or II 2G/3D cX
- bearing housing option with single-acting or double-acting mechanical seal
- block pump with plug-in shaft with single-acting or double-acting mechanical seal
- magnetic coupling
The ATEX identi cation of the SAWA pumps is as follows: II 2G cX or II 2G/3D cX
Motors
- with ameproof enclosure EEx de IIC T4 (e.g. for operation with frequency converter) forzones1and2or
- EEx e II T3 for zones 1 and 2
Other motor types are also available on request.
