In refrigeration systems using refrigerant gas HFC-134a, the gas is relatively stable, but caution is required when used in industrial or enclosed environments. Due to the material properties of HFC-134a, if the flush diaphragm of a pressure transmitter is joined by laser welding or similar welding methods, detachment or separation at the welded area of the diaphragm may occur as a result of the gas characteristics.

The flush diaphragm of the pressure sensor applied to EDN.337 has no laser welding or other welded joints. It is a piezoresistive silicon pressure sensor with a one-body flush diaphragm.

In other words, EDN.337 is a pressure transmitter developed with applied technology that fundamentally prevents damage caused by refrigerant gas HFC-134a during the manufacturing process. It addresses and eliminates potential issues that commonly occur in general pressure transmitters when used with refrigerant gas HFC-134a.