DA09 Differential Pressure Gauge for Liquids and Aggressive Gases | Fischer

Key Features: Fischer DA09 Differential Pressure Gauge

The Fischer DA09 is a mechanical differential pressure gauge designed to measure and indicate differential pressure in liquids, gases and aggressive media within demanding industrial processes.

Its stainless-steel construction and highly corrosion-resistant materials make it suitable for the chemical, petrochemical, marine, power-generation and process-engineering industries.

The DA09 product family provides measuring ranges from 0–25 mbar up to 0–25 bar, as well as compound ranges combining negative and positive pressure. Depending on the selected range, the instrument is available for PN10 or PN25 nominal pressure.

The measuring system consists of a diaphragm located between two separate pressure chambers. The difference between the pressure applied to the positive and negative sides causes axial diaphragm movement, which is mechanically transferred to the indicating pointer.

The symmetrical measuring-system design compensates for static process pressure. The instrument also withstands one-sided overload of up to ten times the upper scale value without exceeding the relevant nominal pressure.

The DA09 can be used as a local indicator without electrical power or equipped with adjustable electrical contacts to generate alarms, control signals or notifications when differential pressure reaches the defined limits.

For installations exposed to vibration, heavy pulsation or condensation, the gauge can be supplied with damping-fluid filling. Multiple process connections and mounting options are available for direct, wall or pipe installation.

As a Fischer distributor, Garma Electrónica provides technical support for selecting the correct range, nominal pressure, materials, process connections and electrical contacts.

Main Specifications: Fischer DA09 Differential Pressure Gauge

• Measured variable: differential pressure.
• Media: liquids, gases and aggressive media compatible with the instrument materials.
• Application: local differential-pressure indication and monitoring in industrial processes.
• Minimum ranges: from 0–25 mbar.
• Maximum ranges: up to 0–25 bar.
• Compound ranges: available from −40/+60 mbar up to −1/+5 bar, depending on configuration.
• Available units: mbar, bar, kPa and PSI, depending on version.
• Measuring principle: diaphragm with two pressure chambers and mechanical pointer transmission.
• Accuracy: class 1.6; maximum deviation ±1.6% of measuring span.
• Nominal pressure: PN10 or PN25, depending on measuring range.
• One-sided overload resistance: up to ten times the upper scale value, limited by nominal pressure.
• Indication: analogue dial and pointer.
• Dial sizes: NG100 or NG160, depending on configuration.
• Output: local mechanical indication.
• Electrical contacts: optional limit contacts for alarm and control.
• Ingress protection: IP66 according to EN 60529.
• Ambient temperature: −20 to +80°C.
• Storage temperature: −20 to +80°C.
• Maximum medium temperature: up to 100°C.
• Housing: CrNi stainless steel 1.4301 or 1.4404, depending on version.
• Process connections: stainless steel 1.4404.
• Pressure chambers: stainless steel 1.4404.
• Diaphragm material: stainless steel, DURATHERM® or INCONEL® 718, depending on range.
• Metal bellows: nickel-chromium Alloy 625.
• Sealing: metal seal.
• Window: laminated safety glass.
• Construction: silicone-free in the standard configuration.
• Mounting: direct, wall or 2-inch pipe mounting.
• Mounting position: vertical.
• Weight: approximately 2.7 to 7 kg, depending on configuration.

Applications and Benefits: Fischer DA09 Differential Pressure Gauge

Differential Pressure Monitoring in Liquids and Gases

The DA09 compares the pressure at two points in an installation and directly displays the difference. This measurement helps identify pressure losses, blockages, process variations and abnormal operating conditions.

Chemical and Petrochemical Industry

Its stainless-steel construction and corrosion-resistant alloys make it suitable for many chemical fluids and aggressive gases, provided that material compatibility is confirmed before selection.

It can be used to monitor filters, separators, heat exchangers, pumps, reactors and other equipment in chemical and petrochemical plants.

Industrial Filter Monitoring

Differential pressure upstream and downstream of a filter indicates its degree of contamination. As pressure loss increases, the gauge shows that the filter requires cleaning, maintenance or replacement.

Versions equipped with electrical contacts can automatically generate an alarm when the configured limit is reached.

Pump Monitoring

The DA09 can compare pump suction and discharge pressure, helping to detect performance loss, cavitation, blockages or abnormal operating conditions.

Heat Exchangers

Differential-pressure measurement across a heat exchanger helps detect fouling, deposits or internal restrictions that reduce thermal efficiency and increase energy consumption.

Marine and Offshore Industry

Its rugged stainless-steel construction, IP66 protection and optional damping-fluid filling make the DA09 suitable for marine and offshore installations exposed to humidity, saline atmospheres, vibration and rapid pressure fluctuations.

Power-Generation Plants

The instrument can monitor filters, pumps, cooling circuits, auxiliary systems and heat exchangers in thermal power stations, generation plants and other energy installations.

Mechanical and Plant Engineering

Its wide selection of ranges and process connections allows the DA09 to be integrated into industrial machinery, test benches, hydraulic units and process plants requiring rugged local indication.

Alarm and Control Signals

Optional limit contacts allow the DA09 to operate as both an indicator and a monitoring device. Switching points can be adjusted to activate alarms, stop equipment or send signals to a control system.

Applications with Vibration and Pulsation

In installations exposed to strong vibration or rapid pressure fluctuations, optional case filling damps pointer movement, improves readability and reduces mechanical wear.

Technical Advantages of the Fischer DA09

• Mechanical measurement without an electrical power supply.
• Suitable for compatible liquids, gases and aggressive media.
• Highly corrosion-resistant construction.
• Ranges from 25 mbar to 25 bar.
• PN10 and PN25 versions.
• High one-sided overload resistance.
• IP66 protection for demanding industrial environments.
• Medium temperatures up to 100°C.
• Optional electrical contacts for alarm and control.
• Optional damping-fluid filling for vibration and pulsation.
• Multiple process connections and mounting systems.
• NG100 and NG160 dials for clear local reading.

Mounting and Configuration Options

• Direct mounting on pressure lines.
• Wall mounting using a plate or bracket.
• Mounting on a 2-inch or DN50 pipe.
• Female or male threaded connections.
• Stainless-steel cutting-ring fittings.
• 100 or 160 mm dial.
• Single or double electrical contacts.
• Side connector for versions with electrical contacts.
• Paraffin oil, glycerine or oil filling, depending on configuration.

Information Required to Select the Fischer DA09

The following application data should be defined before selecting the gauge:

• Minimum and maximum differential-pressure range.
• Maximum static process pressure.
• Type of liquid or gas.
• Chemical compatibility with wetted materials.
• Fluid and ambient temperature.
• Required display unit.
• Dial size: NG100 or NG160.
• Process-connection type and position.
• Direct, wall or pipe mounting.
• Requirement for electrical contacts.
• Number and function of switching points.
• Presence of vibration or pressure pulsation.
• Requirement for damping-fluid filling.

Garma Electrónica provides technical support for selecting the measuring range, nominal pressure, materials, process connections, contacts and options required for each differential-pressure application.