Chemistry diaphragm pump MD 4C EX three stage, 230 V / 50 Hz with ATEX approval: pumping chamber (pumped gases): II 2G IIC T3 X environment (without inert purge gas): II 3G IIB T4 X environment (with inert purge gas): II 2G IIB T4 X motor: II 2G Ex d IIB T4, incl. switch for manual reset, safety protective switch, cable without plug