EDN.630 only for Hydrogen application
■ EDN.630, Gold plated diaphragm [Hydrogen explosion-proof]
- Gold plated diaphragm for Hydrogen
application
- Accuracy ±0.5%, ±0.25%, ±0.1% F.S
■ Product Overview
The EDN.630
pressure transmitter is specially designed for hydrogen environments. It can be
used for hydrogen supply line pressure measurement, hydrogen fueling stations,
hydrogen production systems, and high-pressure hydrogen storage systems.
The sensor
diaphragm is gold plated, and the product has obtained KOSHA flameproof
explosion-proof certification Ex d IIB+H2 T4. According to user requirements,
three accuracy grades are available: standard, high accuracy, and precision.
■ Measuring Principle
EDN.630 uses a
piezoresistive silicon pressure sensor to convert pressure into an electrical
signal. The gold plated diaphragm is designed to maintain stable measurement
performance in hydrogen service.
■ Materials
of Wetted Parts
The wetted parts
are made of stainless steel 316L, and the diaphragm of the measuring sensor is
gold plated to improve resistance against hydrogen permeation and hydrogen
embrittlement.
■ Accuracy Class
▶ EDN.630 -A4 / Standard: ±0.5% F.S
▶ EDN.630 -A7 / High accuracy: ±0.25% F.S
▶ EDN.630 -A9 / Precision: ±0.1% F.S
■ Applications
▶ Hydrogen supply line pressure measurement
▶ Hydrogen fueling stations
▶ Hydrogen production systems
▶ High-pressure hydrogen storage systems
■ Explosion-proof rating
▶ Ex d IIB+H2 T4, certified by KOSHA
■ General Technical Specifications
|
Pressure ranges |
-1…0 bar & 0…1050 bar |
|
Accuracy |
Standard: ± 0.5% F.S High accuracy: ± 0.25% Precision: ± 0.1% |
|
Electrical connection |
Explosion proof connecting cable gland |
|
Signal output |
4...20 mA, 2 wire-system 0…10V, 3 wire-system 0…5V, 3 wire-system 1…5 V, 3 wire-system 0.5…4.5V, 3-wire system 0.5…4.5V/5V, ratio-metic |
|
Operating temperature |
-20…+100 ℃ |
■ Hydrogen Permeation
The size of a
hydrogen molecule is about 1Å, while the lattice spacing of metallic materials
such as stainless steel or Hastelloy C276 is typically about 2 to 3Å. Because
of its small molecular size, hydrogen can pass through thin metal films easily.
EDN.630 applies a gold plated diaphragm to suppress this hydrogen permeation
effect.
■ Hydrogen Embrittlement
Hydrogen can cause
hydrogen embrittlement, a phenomenon in which metals exposed to hydrogen over
time become brittle. If this affects a pressure sensor, the sensor may harden
and fail to reflect actual pressure changes correctly. By applying gold plating
to the sensor diaphragm, EDN.630 minimizes problems associated with hydrogen
embrittlement and hydrogen permeation.
■ Product Image and Certificate
Left: EDN.630
product image Right:
KOSHA safety certificate
