SIEMENS SITRANS P DS III series pressure transmitter

SIEMENS SITRANS P DS III series pressure transmitter

Product positioning and core functions

Product model: Covering three sub series: 7MF4.33., 7MF4.34., and 7MF4.35., suitable for pressure measurement of corrosive, non corrosive, and hazardous gases, vapors, and liquids.

Measurement type:

Basic measurements: Gauge Pressure, Absolute Pressure, Differential Pressure;

Extended measurement: Through parameter configuration and additional components such as flow orifice plates and remote seals, liquid level, volume, mass, volumetric flow, and mass flow measurements can be achieved.

Core output: Always a 4-20mA load independent DC signal, supporting three communication protocols: HART, PROFIBUS PA, and Foundation Fieldbus.

Explosion proof features: Provides two explosion-proof versions: intrinsic safety (Ex i) and explosion-proof (Ex d), compliant with ATEX 94/9/EC directive, can be installed in hazardous environments in zones 0/1/2, and has an EC type inspection certificate.

Safety warning system (core emphasis)

1. Risk grading standards

The document adopts a four level risk warning system, clarifying the definitions and response requirements for different risk levels:

Warning level identification, risk description, typical scenarios

DANGER red safety warning symbol. Failure to take measures may result in death or serious personal injury. Failure to ventilate during toxic medium leakage

Warning red safety warning symbol. Failure to take measures may result in death or serious personal injury. Use of non explosion proof equipment in hazardous areas

CAUTION yellow safety warning symbol. Failure to take measures may result in minor personal injury from contact with equipment surfaces above 70 ℃

NOTICE unsigned failure to take measures may result in property damage and unauthorized modification of equipment

2. Key safety requirements

Personnel qualifications: Only "qualified personnel" are allowed to operate, and the following abilities are required:

Master the knowledge of safety protection for electrical circuits, high-voltage equipment, and hazardous media;

Familiar with electrical operation standards in hazardous areas;

Able to use protective equipment and possess first aid skills.

Special requirements for hazardous areas:

Explosion proof type selection: The appropriate explosion-proof version (Ex i/Ex d/nA) should be selected based on the hazardous area level (such as Zone 0, Zone 1, Zone 2), and non corresponding explosion-proof components should be prohibited;

Electrostatic protection: When operating in hazardous areas, close the key cover and tighten the screws to avoid static electricity accumulation and explosion;

Wiring specifications: Use B-type RCD (trip limit 300mA), the power supply must comply with SELV (safety isolation ultra-low voltage) requirements, and shielded cables must only be grounded at one end.

Equipment modification restrictions: Only modifications according to document instructions are allowed. Unauthorized modifications will result in the invalidation of warranty and the invalidation of explosion-proof certification.

Installation specifications (mechanical+electrical)

1. Preparation before installation

Arrival inspection:

Check the packaging and equipment for any transportation damage. If there is any damage, immediately claim compensation from the shipping company and keep the damaged parts;

Compare the order with the shipping documents to confirm the integrity and correctness of the equipment model and accessories (such as flanges and seals);

Prohibit the use of damaged or incomplete equipment (especially in hazardous areas, which may cause explosions).

Environmental conditions: The following environmental requirements must be met, otherwise it may affect equipment performance or cause safety accidents:

Remarks on Environmental Parameter Requirements

Operating temperature -40~85 ℃ (Ex i/T6 version -40~60 ℃) Avoid direct sunlight, and additional heat dissipation is required in high-temperature environments

Storage temperature -50~85 ℃. The packaging only provides limited moisture-proof protection and requires additional protection

Humidity ≤ 95% (no condensation). Moisture proof devices need to be installed in condensing environments

Vibration acceleration ≤ 9.8m/s ² (in accordance with DIN IEC 68-2-6) Keep away from strong vibration equipment (such as pumps and compressors)

The output current drops to 80% when the altitude is ≤ 2000m (over altitude requires reduced capacity)

2. Mechanical installation specifications

General requirements:

Installation method: Only vertical installation is allowed to avoid shell rotation (which may damage the measuring unit);

Explosion proof gap: The distance between the explosion-proof surface of explosion-proof equipment and fixed components should be ≥ 40mm to prevent explosions caused by high-temperature gas leakage;

Sealing selection: The flange seal should be compatible with the process medium (such as PTFE seal used in FDA compliant scenarios), and the seal should be centered without obstructing the movement of the diaphragm.

Scenario based installation differences: According to the measurement medium state, the equipment installation position and pipeline layout need to be designed differently: