For the level switch and temp. sensor, the approval specified by you : EEx e IIA T3 is not available. They have EEx de IIC T6. T6 is 85 deg C and T3 is 200 deg C. I have attached the pdf files of the approvals available from their catalogue ordering information. The supplier is Endress+Hauser. I have also attached the ATEX directive for your reference. Please have a look and let us know if this is acceptable.