DA03 Differential Pressure Gauge for Industrial Processes | Fischer

Key Features: Fischer DA03 Differential Pressure Gauge

The Fischer DA03 is a mechanical differential pressure gauge designed to measure and monitor differential pressure in liquids and gases within demanding industrial processes.

Unlike compact transmitters primarily intended for HVAC applications, the DA03 is designed for process installations involving high static pressure, aggressive media, vibration, pressure pulsation and severe environmental conditions.

The product family covers differential-pressure ranges from low mbar values to high bar ranges, depending on the measuring cell, pressure rating and selected configuration. Versions are available for PN40, PN100 and PN160 pressure levels.

Its measuring system uses two mechanically connected diaphragms. The difference between the pressures applied to the high- and low-pressure chambers produces a proportional displacement that is transferred to the indicating pointer.

The design includes one-sided overload protection. When one chamber is subjected to pressure beyond the measuring range, the internal transfer fluid supports the measuring diaphragms and compensates for the forces applied.

The DA03 can be configured as a local indicator or equipped with electrical alarm contacts for minimum and maximum limit monitoring. Inductive contacts, snap-action contacts, low-action contacts and an angular-position transmitter are available, depending on the selected version.

Different material combinations, including stainless steel and Hastelloy C276 versions, enable the instrument to be adapted to corrosive fluids and chemical applications. Diaphragm seals can also be considered for particularly demanding process conditions.

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

Main Specifications: Fischer DA03 Differential Pressure Gauge

• Measured variable: differential pressure.
• Media: liquids and gases compatible with the selected wetted materials.
• Application: local differential-pressure indication and monitoring in industrial processes.
• Measuring ranges: from 40 mbar to 40 bar within the product family, depending on version.
• Compound ranges: available depending on configuration.
• Measuring principle: mechanical twin-diaphragm system with motion transfer.
• Accuracy: ±1.6% of measuring span.
• Zero-point adjustment: approximately ±25% of measuring span.
• Nominal pressure: PN40, PN100 and PN160 versions.
• Overload protection: one-sided overload resistance up to the rated pressure of the selected measuring system.
• Indication: analogue dial with pointer movement up to 270°.
• Dial sizes: NG100 or NG160, depending on configuration.
• Output: local indication with optional electrical contacts.
• Optional contacts: low-action, snap-action or inductive contacts.
• Remote transmission: angular-position transmitter available for selected versions.
• Ingress protection: IP65 according to EN 60529.
• Ambient temperature: −20 to +60°C.
• Storage temperature: −40 to +80°C.
• Maximum medium temperature: up to 100°C, depending on configuration.
• Process connections: G or NPT threads, tube fittings and DIN EN 61518 flange, depending on version.
• Standard connection material: 316L stainless steel.
• Special materials: Hastelloy C276 measuring systems for aggressive media.
• Mounting: wall, pipe or panel mounting.
• Approvals: ATEX versions available according to execution and contact type.

Applications and Benefits: Fischer DA03 Differential Pressure Gauge

Differential Pressure Measurement in Industrial Processes

The Fischer DA03 directly compares two pressures within an installation. This measurement is used to monitor pressure losses, verify equipment performance and identify abnormal process conditions.

Industrial Filter Monitoring

Differential pressure upstream and downstream of a filter indicates its degree of contamination. The DA03 provides clear local indication and, when fitted with contacts, can generate an alarm when the defined limit is reached.

Pump and Hydraulic-System Monitoring

The instrument can monitor pressure differences across pumps, hydraulic circuits, heat exchangers, valves and other process equipment. Its high static-pressure resistance is particularly useful when the measured differential pressure is small compared with the total system pressure.

Chemical and Petrochemical Industry

Stainless-steel and Hastelloy versions allow the DA03 to be used with compatible corrosive media. Diaphragm-seal configurations can be considered for particularly aggressive, viscous or high-temperature fluids.

Marine and Offshore Applications

Its rugged construction, IP65 protection and optional case filling make it suitable for marine installations, offshore plants and machinery exposed to vibration or rapid pressure fluctuations.

Power Plants and Process Engineering

The DA03 is suitable for monitoring filters, pumps, heat exchangers and auxiliary circuits in power plants, industrial machinery and process installations.

Differential Pressure Alarms

Optional electrical contacts turn the gauge into a monitoring device. Limit values can be used to generate alarms, stop equipment or signal a control system when differential pressure exceeds the permitted level.

Hazardous-Area Applications

Fischer offers ATEX configurations for selected DA03 versions. Selection must consider the hazardous-area classification, contact type, gas or dust group and maximum permitted temperature.

Options for Demanding Operating Conditions

• Case filling to damp vibration and pressure pulsation.
• Trailing pointer to retain the highest measured value.
• Reference pointer for visual limit indication.
• Electrical contacts for alarm and control functions.
• Corrosion-resistant wetted materials.
• Remote diaphragm seals for aggressive or high-temperature fluids.
• Valve manifold for isolation and pressure equalisation.
• Wall, pipe or panel mounting.

Technical Advantages of the Fischer DA03

• Mechanical measurement without an external power supply in the indicator-only version.
• Wide selection of differential-pressure ranges.
• High static-pressure and one-sided overload resistance.
• Suitable for liquids, gases and compatible aggressive media.
• Rugged construction for industrial process applications.
• Clear local indication with NG100 or NG160 dial.
• Optional alarm contacts and remote transmission.
• ATEX versions available for selected configurations.
• Different wetted materials and process connections.
• Suitable for chemical, energy, marine and process-engineering applications.

Information Required to Select the Fischer DA03

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

• Minimum and maximum differential-pressure range.
• Maximum static system pressure.
• Fluid type, composition and temperature.
• Chemical compatibility of wetted materials.
• Requirement for stainless steel, Hastelloy or diaphragm seals.
• Required dial size: NG100 or NG160.
• Process-connection type and position.
• Wall, pipe or panel mounting.
• Requirement for alarm contacts.
• Number and function of switching points.
• Presence of vibration or pressure pulsation.
• ATEX zone classification, when applicable.

Garma Electrónica provides technical support for selecting the measuring range, pressure rating, materials, contacts and accessories required for each differential-pressure application.