Chemistry pumping unit MD 4C EX VARIO +AK+EK, 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 Gbcable without plug, control signal line 4-20 mA without plug