■ ERS.368, IP68 Submersible Pressure Transmitter with RS485 & Analog Output

- All stainless steel housing & wetted parts

- Pressure range: 0…20 mbar to 0…30 bar

- Accuracy: ±0.5%, ±0.25% & ±0.1% F.S

- RS485 (Modbus RTU) & analog output

- IP68 certified with cable gland

- Special cable with atmospheric pressure compensation tube

 

■ Product Overview

The ERS.368 is a submersible pressure transmitter designed for hydrostatic pressure and level measurement of liquids such as water and oil.

The housing and all wetted parts are made of stainless steel 316L, providing reliable pressure measurement in various liquid environments. With an IP68-rated construction, the transmitter is suitable for installation in submerged environments and inside tanks or storage systems.

The ERS.368 supports RS485 digital communication and various analog output signals, including 4…20 mA and voltage outputs. The RS485 interface uses the Modbus RTU protocol, allowing integration with various control and monitoring systems.

The transmitter is also equipped with a special cable containing an atmospheric pressure compensation tube, which allows compensation for changes in atmospheric pressure during level measurement.

 

■ Pressure Measurement Principle

The ERS.368 measures hydrostatic pressure generated by the liquid head and is used to determine liquid level or depth.

The pressure acting on the sensor diaphragm is converted into an electrical signal and processed by the internal electronics. The measured value is then provided through an analog output or RS485 digital communication interface.

For level measurement, the appropriate pressure range should be selected according to the specific gravity and measurement depth of the liquid. The total cable length should also be specified according to the final connection point during the initial ordering process.

 

■ Application Areas

The ERS.368 is designed for various industrial applications requiring hydrostatic pressure and liquid level measurement.

▶ Hydrostatic pressure measurement

▶ Level measurement in vessels and storage systems

▶ Water and fuel storage tank level measurement

▶ Seawater desalination plants

▶ Submerged and liquid storage systems

▶ Industrial liquid level monitoring and control systems

 

■ Materials of Wetted Parts

The pressure port, housing, sensor diaphragm, and other wetted parts of the ERS.368 are made of stainless steel 316L.

FKM is used for the sensor sealing, providing reliable operation in various liquid environments.

The transmitter also features a stainless steel cable gland and an IP68-rated construction for submerged installation and level measurement inside tanks.

■ Accuracy Class

The ERS.368 is available in the following accuracy classes according to the user's requirements.

▶ A4: ≤ ±0.5% F.S

▶ A7: ≤ ±0.25% F.S

▶ A9: ≤ ±0.1% F.S

Accuracy is specified according to IEC 60770 limit point adjustment and includes Non-Linearity, Hysteresis, and Repeatability.

 

■ Communication & Switches

The ERS.368 is designed to support RS485 digital communication together with analog output signals.

The RS485 interface uses the Modbus RTU protocol, while various analog output options are available depending on the user's system requirements.

▶ RS485 (Modbus RTU)
▶ 4…20 mA, 2-wire system
▶ 0…10 V, 3-wire system
▶ 0…5 V, 3-wire system
▶ 1…5 V, 3-wire system

 

■ General Technical Specifications

Pressure ranges	0…20 mbar to 0…30 bar
Accuracy	≤ ±0.5% FSO ≤ ±0.25% FSO ≤ ±0.1% FSO
Electrical connection	IP68 cable gland, stainless steel
Signal output	Modbus protocol via RS485 interface (Standard)   4...20 mA, 2 wire-system (option) 0…10V, 3 wire-system (option) 0…5V, 3 wire-system (option) 1…5 V, 3 wire-system (option)
Operating temperature	-20…+80 ℃ / standard -40…+125℃ / option