■ EDN.369 Threaded Level Measurement Pressure Transmitter

-       Threaded process connection (various types)

-       Suitable for level & pressure measurement (water, oil, air)

-       Piezoresistive silicon pressure sensor

-       IP68 protection

-       Accuracy ±0.5%, ±0.25%, ±0.1% F.S

 

■ Product Overview

The EDN.369 series is a threaded-type pressure transmitter designed for hydrostatic level measurement.

 

Unlike submersible types, it can be installed externally on pipelines or structures using threaded process connections, offering flexibility in installation.

 

It is based on a piezoresistive silicon pressure sensor and constructed with stainless steel, making it suitable for water, oil, and other non-corrosive fluids.

 

With IP68 protection, the transmitter is suitable for outdoor, submerged, and harsh environmental conditions.

 

The EDN.369 can be used not only for level measurement but also for general pressure measurement in pipelines.

 

■ Pressure Measurement Principle

The EDN.369 measures level using hydrostatic pressure.

 

P = ρ g h+ Po

            Ρ : Density of the liquid

            g : Gravitational acceleration

            h: Height (level) of the liquid

            Po : Pressure applied at the liquid surface (atmospheric pressure)

            (For example, a liquid depth of 100 cm corresponds approximately to 100 mbar (for water))

The pressure generated by the fluid height is transmitted to the sensor and converted into an electrical signal.

 

This method assumes a specific gravity of 1 (water), and compensation can be applied for other fluids such as oil.

 

Atmospheric pressure compensation is essential to ensure accurate measurement.

 

■ Materials of Wetted Parts

Wetted parts are made of stainless steel, ensuring durability and corrosion resistance in water and oil applications.

 

■ Accuracy Class

▶ ±0.5% F.S (standard)

▶ ±0.25% F.S (option)

▶ ±0.1% F.S (option)

 

■ Applications

▶ Level measurement systems

▶ Water and oil tanks

▶ Pipeline pressure monitoring

▶ Water treatment systems

▶ Outdoor instrumentation

▶ Pneumatic & hydraulic systems

 

■ Installation Notes

▶ Suitable for open tank applications

▶ Differential pressure transmitters recommended for closed tanks

▶ Cable length must be defined at order stage (no extension possible)

 

■ General Specifications

Pressure ranges	0…20 mbar to 0…20 bar
Accuracy	± 0.5% F.S ± 0.25% F.S ± 0.1% F.S
Electrical connection	Vented cable (atmospheric pressure compensated)
Signal output	4...20 mA, 2 wire-system 0…10V, 3 wire-system 0…5V, 3 wire-system 1…5V, 3 wire-system 0.5…4.5V, 3 wire-system
Operating temperature	-20…+80 ℃ / standard -40…+125℃ / option