EDN.305 For industrial applications 0.5% F.S
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.
|
Classification |
R-134a
(HFC-134a) |
Ammonia
(NH₃) |
|
Chemical
formula |
C₂H₂F₄ |
NH₃ |
|
Odor |
Almost odorless |
Strong, pungent odor (easy
to detect leakage) |
|
Toxicity |
Very low (non-toxic) |
Toxic – hazardous at high
concentration |
|
Flammability |
Non-flammable |
Mildly flammable (explosive
limits exist) |
|
Environmental
impact |
ODP 0, GWP ~1300 →
significant global warming impact |
ODP 0, GWP 0 → eco-friendly,
widely used as a standard refrigerant |
|
Operating
pressure |
Medium pressure |
Relatively high pressure |
|
Cooling
efficiency (COP) |
Good; widely used in
standard refrigeration equipment |
Very high; one of the most
efficient refrigerants |
|
Material
requirements |
Compatible with most
metals/rubber materials |
Copper/brass corrosion →
requires iron-based materials |
|
Applications |
Automotive A/C,
refrigerators, commercial cooling |
Industrial cold storage,
food processing, ice-making systems |
|
Cost /
Maintenance |
Low cost, easy maintenance |
Higher initial cost;
requires specialized operation |
|
Typical
usage fields |
Automotive A/C, small and
mid-sized refrigeration & HVAC |
Food processing plants, cold
warehouses, ice systems, large industrial refrigeration |
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.
Specifications
Pressure ranges | -1…0 bar to 0…1000 bar |
Accuracy | ± 0.5% F.S |
Electrical connection | DIN 43650 mpm plug M12 plug 2m cable on request |
Signal output | 4...20 mA, 2 wire-system 0…10V, 3 wire-system 0…5V, 3 wire-system 1…5 V, 3 wire-system |
Operating temperature | -20…+80 ℃ / standard -40…+125℃ / option |
