PDS873 Single Flange Direct Mount Pressure Transmitter

PDS873 Single Flange Direct Mount Pressure Transmitter Overview

The PDS873 single flange direct mount pressure transmitter is used to measure process pressure through a flange-mounted diaphragm seal. Unlike a standard threaded pressure transmitter, the process medium does not enter a small threaded pressure port. Instead, the medium acts on the diaphragm seal surface, and the pressure is transferred to the sensing element through the filled seal system.

This structure is useful for difficult process conditions, especially when the medium is:

• corrosive
• viscous
• crystallizing
• dirty
• easy to block
• high temperature
• not suitable for small threaded process ports

The PDS873 uses a monocrystalline silicon compound sensor and supports remote setting, monitoring, diagnostics, and simulation through compatible communication devices. It is suitable for smart pressure measurement applications where reliable isolation, stable output, and easier maintenance are required.

Smart Flanged Pressure Transmitter Output and Communication

The PDS873 single flange direct mount pressure transmitter supports several output and communication options for different automation systems.

For most industrial pressure measurement loops, 4–20 mA with HART communication is commonly selected because it is easy to integrate with PLC and DCS systems while still supporting smart configuration and diagnostics.

Key Features of the PDS873 Flanged Pressure Transmitter

Single Flange Direct Mount Diaphragm Seal

The single flange direct mount structure allows the diaphragm seal to be installed directly on the process flange. It provides a larger sensing surface than a threaded connection and helps reduce blockage risk in difficult media.

Monocrystalline Silicon Compound Sensor

The transmitter uses a monocrystalline silicon compound sensor, supporting stable pressure measurement and smart signal conversion for industrial applications.

Gauge Pressure and Absolute Pressure Options

The PDS873 can be selected for gauge pressure or absolute pressure measurement according to process requirements.

30:1 Rangeability

The maximum rangeability of 30:1 provides flexibility for different calibrated spans and pressure measurement ranges.

Long-Term Stability for Process Pressure Measurement

The transmitter provides long-term stability of ±0.1% FS over 10 years, helping reduce recalibration frequency and maintenance work.

Intelligent Diagnostics and Simulation

The PDS873 supports intelligent diagnostics and simulation functions, helping users check transmitter status, verify output signals, and simplify commissioning or troubleshooting.

Multiple Configuration Methods

The transmitter can be configured through HART, PROFIBUS PA, FOUNDATION Fieldbus, WirelessHART, ZigBee, or compatible communication tools depending on the selected communication option.

Multiple Corrosion-Resistant Material Options

Different diaphragm and wetted material options can be selected for corrosive or special media. Material selection should be confirmed according to medium composition, temperature, pressure, and corrosion characteristics.

Technical Specifications for PDS873 Pressure Transmitter Selection

PDS873G Gauge Pressure and PDS873A Absolute Pressure Options

The PDS873 series can be selected according to pressure reference type.

PDS873G Gauge Pressure Transmitter

The PDS873G gauge pressure transmitter measures pressure relative to atmospheric pressure. It is commonly used for tank pressure, pipeline pressure, reactor pressure, vessel pressure, and process equipment pressure measurement where a diaphragm seal flange is required.

PDS873A Absolute Pressure Transmitter

The PDS873A absolute pressure transmitter measures pressure relative to absolute vacuum. It is suitable for vacuum systems, sealed vessels, evaporation processes, gas systems, and applications where atmospheric pressure variation should not affect the pressure measurement.

Industrial Applications of PDS873 Single Flange Direct Mount Pressure Transmitter

Chemical and Petrochemical Pressure Measurement

Used for pressure measurement in reactors, storage tanks, pipelines, dosing systems, separators, and process vessels where the medium may be corrosive, viscous, crystallizing, or easy to block.

Corrosive Liquid and Gas Pressure Measurement

With suitable diaphragm and flange material, the PDS873 can be used for acid, alkali, solvent, and other corrosive media. For severe corrosion, materials such as Hastelloy, tantalum, Monel, or PTFE-lined structures may be considered according to compatibility.

Viscous or Crystallizing Media

The flange-mounted diaphragm seal helps avoid the blockage problems that may occur with small threaded pressure ports. It is suitable for viscous liquids, sticky media, crystallizing liquids, slurry-like media, and dirty process fluids.

High-Temperature Process Pressure Measurement

For high-temperature liquids or steam-related service, the direct mount structure, filling fluid, and diaphragm seal design should be checked carefully. If the process temperature is too high for direct mounting, a capillary remote seal transmitter may be more suitable.

Power Generation and Utility Systems

Used in chemical dosing systems, auxiliary pipelines, storage vessels, boiler-related systems, and process pressure monitoring points.

Water Treatment and Environmental Systems

Suitable for pressure measurement in dosing skids, treatment tanks, wastewater systems, sludge-related applications, and industrial water systems where clogging or corrosion may occur.

Industrial Automation and Control Loops

Suitable for PLC/DCS systems requiring 4–20 mA HART, fieldbus, or wireless pressure measurement signals for process monitoring and control.

How to Select a PDS873 Single Flange Direct Mount Pressure Transmitter

When selecting a PDS873 single flange direct mount pressure transmitter, the following details should be confirmed:

1. Pressure type
   Select PDS873G for gauge pressure or PDS873A for absolute pressure.
2. Measuring range
   Confirm normal pressure, maximum pressure, vacuum condition if any, and calibrated range.
3. Process medium
   Confirm whether the medium is corrosive, viscous, crystallizing, dirty, toxic, high-temperature, or easy to block.
4. Diaphragm and wetted material
   Select suitable diaphragm, flange, and gasket materials according to medium compatibility.
5. Process flange size and standard
   Confirm flange size, pressure rating, sealing face, and standard, such as ASME, EN, DIN, JIS, or GB.
6. Process temperature
   Confirm whether direct mounting is suitable. For high-temperature service, check filling fluid, diaphragm seal design, and whether a capillary type is needed.
7. Output signal
   Select 4–20 mA + HART, PROFIBUS PA, FOUNDATION Fieldbus FF, WirelessHART, or ZigBee according to the control system.
8. Installation space
   Confirm whether the transmitter can be directly mounted on the flange without interference from pipes, platforms, insulation, or surrounding equipment.
9. Explosion-proof requirement
   For hazardous areas, confirm the required explosion-proof certification or project standard.
10. Accessories
    Confirm whether flushing ring, gasket, mating flange, flanged reducer, mounting bracket, cable gland, or other accessories are required.

Flanged Pressure Transmitter Accessories for PDS873 Installation

Depending on site conditions, the PDS873 single flange direct mount pressure transmitter may be used with different accessories:

• Mating flanges
• Flushing rings
• PTFE gaskets
• Spiral wound gaskets
• Flanged reducers
• Threaded flanges
• Mounting brackets
• Explosion proof cable glands
• Instrument valves
• Tube fittings and installation hardware

For corrosive, viscous, crystallizing, dirty, or high-temperature media, accessories such as flushing rings, suitable gaskets, and flanged reducers can improve installation reliability and maintenance convenience.

Typical installation:

Process Flange → Gasket → PDS873 Single Flange Direct Mount Pressure Transmitter

If a flushing ring is used:

Process Flange → Gasket → Flushing Ring → Gasket → PDS873 Single Flange Direct Mount Pressure Transmitter

Single Flange Direct Mount Pressure Transmitter vs Capillary Pressure Transmitter

The PDS873 single flange direct mount pressure transmitter is suitable when the transmitter can be installed directly on the process flange. However, it may not be the best choice for every application.

If the process is very hot, the flange position is difficult to access, or the transmitter needs to be installed away from the process connection, a capillary pressure transmitter may be more suitable.

PDS873 Single Flange Direct Mount Pressure Transmitter Supplier Support from SIYelectric

SIYelectric supplies PDS873 single flange direct mount pressure transmitters for industrial projects, replacement orders, and process instrumentation procurement. We can help check model codes, review datasheets, confirm technical specifications, match installation accessories, and prepare quotations based on actual operating conditions.

For accurate quotation, please provide:

• pressure type: gauge or absolute
• measuring range
• process medium
• process temperature and pressure
• flange size and standard
• diaphragm and wetted material requirement
• output signal requirement
• display and electrical connection requirement
• explosion-proof or certification requirement
• whether flushing ring or flanged reducer is required
• required accessories or installation conditions

SIYelectric can also support related pressure transmitter accessories such as flushing rings, mating flanges, PTFE gaskets, spiral wound gaskets, flanged reducers, mounting brackets, explosion-proof cable glands, valves, tubing, and fittings.

Available documents may include technical datasheet, certificate of conformity, inspection report, packing list, and commercial invoice, depending on the project and order requirements.