EDN.337 – Refrigerant Gas Pressure Transmitter for NH₃ and HFC-134a Applications

·         Ammonia (NH₃), toxic gas

·         Refrigerant gas R-134a (HFC-134a), low-toxicity

The EDN.337 pressure transmitter is specially designed for refrigeration systems that use ammonia gas (NH₃) and the refrigerant gas HFC-134a. Although HFC-134a is considered a relatively stable substance, it still requires attention when used in industrial plants or confined spaces. Due to the material properties of these refrigerants, the flush diaphragm of the pressure sensor must be constructed as a single integrated structure with the sensor body.

If the wetted parts were joined by laser welding or other heat-based welding processes, the chemical characteristics of toxic gases could cause the welded seams of the diaphragm to detach or separate.

The flush diaphragm of the pressure sensor used in the EDN.337 is not formed by laser welding or any type of thermal seam-joining process. Instead, the flush diaphragm and the sensor body are manufactured as a single-piece, integrated Piezoresistive silicon pressure sensor.

This design eliminates the risk of weld separation or detachment that can occur when conventional pressure transmitters are exposed to toxic ammonia gas or HFC-134a refrigerants.

The EDN.337 is an advanced pressure transmitter developed to prevent the typical failures that general pressure transmitters may experience when used with toxic ammonia gas (NH₃) or non-toxic refrigerant gas HFC-134a (C₂H₂F₄). By applying a one-body flush diaphragm pressure sensor structure that is inherently resistant to these gases, EDN.337 offers enhanced durability and reliability in refrigeration applications.