DE58 Differential Pressure Transmitter for Cryogenic Tank Level | Fischer

Key Features: Fischer DE58 Differential Pressure Transmitter

The Fischer DE58 is a digital differential pressure transmitter and switch specifically designed for level measurement and monitoring in liquefied technical-gas and cryogenic storage tanks.

The instrument measures positive pressure, negative pressure and differential pressure in compatible liquid and gaseous media. In cryogenic applications, tank level is determined from the hydrostatic pressure generated by the liquid column.

The DE58 is particularly suitable for tanks containing liquid nitrogen, liquid oxygen, liquid argon and liquefied carbon dioxide, as well as technical-gas storage and distribution installations.

Its diaphragm measuring system provides a rugged design, high overload resistance and wear-free operation. An inductive pickup converts diaphragm movement into an electrical signal proportional to the measured value.

The unit combines digital indication and switching functions for minimum and maximum limit monitoring. Depending on the selected configuration, an analogue output can transmit the differential-pressure or level value to a PLC, remote indicator, data logger or SCADA system.

Available configuration functions include selectable pressure units, zero-point adjustment, characteristic scaling, inversion and offset. A table with up to 30 points can be used to adapt the characteristic, while advanced parameterisation and measuring-point documentation are available through the Fischer EU03 PC adapter.

As a Fischer distributor, Garma Electrónica recommends the DE58 for applications requiring level measurement, local indication, analogue transmission and alarm switching in a single rugged instrument for cryogenic storage tanks.

Main Specifications: Fischer DE58 Differential Pressure Transmitter

• Measured variable: differential pressure, positive pressure and negative pressure.
• Main application: level measurement in liquefied technical-gas and cryogenic storage tanks.
• Media: liquids and gases compatible with the instrument materials.
• Measuring ranges: from 160 mbar to 600 mbar, depending on version.
• Measuring principle: diaphragm system with wear-free inductive pickup.
• Indication: 3½-digit LED display.
• Binary outputs: configurable switching contacts for limit signalling.
• Analogue output: available depending on configuration for continuous measured-value transmission.
• Pressure units: selectable engineering units.
• Signal conditioning: characteristic scaling, inversion and offset adjustment.
• Linearisation: configurable table with up to 30 points.
• Configuration: local operation and advanced parameterisation using the Fischer EU03 PC adapter.
• Design: rugged and highly resistant to overload.
• Maintenance: wear-free inductive sensing and maintenance-free operation.
• Integration: suitable for PLCs, remote indicators, alarm systems and SCADA platforms.

Applications and Benefits: Fischer DE58 Differential Pressure Transmitter

Cryogenic Tank Level Measurement

The DE58 indirectly determines liquid level from the differential pressure generated by the product column. This technology provides continuous measurement without requiring moving components inside the storage tank.

Correct range selection must consider the effective measuring height and the density of the liquefied gas, as hydrostatic pressure depends on both parameters.

Liquid Nitrogen, Oxygen, Argon and CO₂ Tanks

The transmitter is suitable for monitoring tanks and mini-tank systems containing liquid N₂, O₂, Ar and CO₂. Local indication allows operators to check tank contents directly, while the electrical outputs support remote monitoring.

Minimum and Maximum Level Alarms

The switching outputs can generate minimum-level, maximum-level or deviation alarms. This supports replenishment planning, prevents tanks from running empty and improves process availability.

PLC and SCADA Integration

The optional analogue output transmits the continuous measured value to a PLC, data-acquisition system or SCADA platform. Operators can monitor trends, record consumption and generate maintenance or replenishment notifications.

Technical-Gas Installations

The DE58 can be used in welding, laser cutting, inerting, purging, gas blanketing, metal fabrication and other processes that use technical gases stored in liquid form.

Marine and Industrial Applications

Its rugged construction and overload resistance make it suitable for industrial storage tanks and selected marine applications requiring tank-content monitoring by differential pressure.

Technical Advantages of the Fischer DE58

• Measurement, indication, transmission and switching in one instrument.
• Specifically designed for liquefied technical-gas level monitoring.
• No moving components installed inside the tank.
• High overload resistance.
• Wear-free inductive sensing and low maintenance requirements.
• Configurable minimum and maximum level alarms.
• Characteristic adaptation using a table with up to 30 points.
• Easy integration into automation and monitoring systems.

Information Required to Select the Fischer DE58

The following application data should be defined before selecting the measuring range and product configuration:

• Technical gas or cryogenic fluid.
• Liquid density under operating conditions.
• Minimum and maximum measuring height.
• Maximum static tank pressure.
• Open, pressurised or closed tank.
• Available pressure connections.
• Required analogue output signal.
• Number and function of alarm points.
• Requirement for local indication and remote monitoring.
• Ambient temperature and installation conditions.

Garma Electrónica provides technical support for calculating the differential-pressure range from the liquid height and density, selecting the correct DE58 configuration and defining the accessories required for installation.