PDS883 Remote Seal Differential Pressure Transmitter

PDS883 Remote Seal Differential Pressure Transmitter Overview

The PDS883 remote seal differential pressure transmitter is used for measuring differential pressure, level, or flow under difficult process conditions. Unlike a standard differential pressure transmitter that uses impulse lines to transfer process pressure, the PDS883 uses remote diaphragm seals and capillaries to transfer pressure to the transmitter sensor.

This structure is especially useful when the process medium is:

• easy to crystallize
• easy to precipitate
• viscous or sticky
• corrosive
• high-temperature or low-temperature
• dirty or slurry-like
• likely to block impulse lines
• unsuitable for direct contact with the transmitter sensor

The remote diaphragm seal isolates the process medium from the transmitter body, while the capillary transfers pressure through filling fluid. This makes the PDS883 suitable for applications where ordinary impulse line installation may cause blockage, freezing, crystallization, or maintenance problems.

Remote Seal DP Transmitter for Differential Pressure, Level, and Flow

The PDS883 can be used for several types of process measurement.

For tank level measurement, the PDS883 is commonly used as a remote seal differential pressure level transmitter, especially in closed tanks, pressurized vessels, high-temperature tanks, or applications where top pressure compensation is required.

Key Features of the PDS883 Remote Seal DP Transmitter

Remote Diaphragm Seal Structure

The remote seal design separates the process medium from the transmitter sensor. This helps prevent crystallization, sediment, corrosion, or viscous media from entering impulse lines or damaging the sensor module.

Suitable for -90°C to +400°C Process Conditions

The PDS883 is designed for difficult temperature applications from -90°C to +400°C. Actual suitability depends on diaphragm seal type, filling fluid, capillary length, installation method, and process conditions.

Differential Pressure, Level, and Flow Measurement

The transmitter can be used for DP measurement, tank level measurement, and flow measurement when matched with suitable process connections or differential pressure primary elements.

Accuracy of ±0.1% FS

The PDS883 provides ±0.1% FS accuracy, suitable for industrial measurement applications where stable differential pressure or level signal output is required.

20:1 Rangeability

With a maximum rangeability of 20:1, the transmitter can be calibrated to different measurement spans within the available range.

Long-Term Stability

The transmitter provides long-term stability of ±0.1% FS over 10 years, helping reduce maintenance and recalibration workload in continuous process operation.

Intelligent Diagnostics and Simulation

The PDS883 supports intelligent diagnostics and simulation functions, helping users check transmitter status, verify output, and simplify commissioning or troubleshooting.

Multiple Corrosion-Resistant Materials

Different diaphragm and wetted materials can be selected according to medium corrosion characteristics, including stainless steel, Hastelloy, tantalum, Monel, PTFE-lined options, or other special materials depending on project requirements.

Technical Specifications for PDS883 Remote Seal Differential Pressure Transmitter Selection

Remote Seal Differential Pressure Level Measurement Principle

For liquid level measurement, the PDS883 remote seal DP transmitter measures the pressure difference between two points of a tank or vessel.

In a closed or pressurized vessel, the bottom side receives pressure from the liquid column plus vapor space pressure, while the top side receives vapor space pressure. The transmitter calculates the differential pressure related to the liquid level after the common top pressure is compensated.

In simple terms:

Liquid Level → Differential Pressure → Remote Diaphragm Seals → Capillary Filling Fluid → DP Sensor → Output Signal

This makes the PDS883 suitable for closed tanks, pressurized vessels, vacuum vessels, high-temperature vessels, and difficult liquid level applications where a single flange level transmitter may not provide reliable compensation.

Industrial Applications of PDS883 Remote Seal Differential Pressure Transmitter

Crystallizing and Precipitating Media

Used for media that may crystallize, precipitate, or solidify in impulse lines. Remote diaphragm seals help avoid blockage and reduce maintenance caused by plugged pressure lines.

High-Temperature and Low-Temperature Applications

Suitable for process conditions from -90°C to +400°C, such as hot oil, high-temperature chemical liquids, low-temperature process fluids, and special industrial media. Filling fluid and seal structure must be selected according to temperature requirements.

Closed Tank Level Measurement

Used for liquid level measurement in closed tanks and pressurized vessels where vapor space pressure must be compensated by the differential pressure measurement principle.

Chemical and Petrochemical Processes

Applied in reactors, separators, storage tanks, distillation columns, process vessels, and pipelines where corrosive, viscous, crystallizing, or dirty media are present.

Flow Measurement with DP Primary Elements

Can be used with orifice plates, venturi tubes, flow nozzles, or other differential pressure flow elements when remote seals are required because the medium is difficult or the temperature is extreme.

Power Generation and Utility Systems

Suitable for high-temperature liquids, chemical dosing systems, boiler auxiliary systems, condensate systems, and process vessels where remote diaphragm seals are needed.

Slurry, Dirty, or Easy-to-Block Process Lines

Used in applications where suspended solids, sediment, sticky media, or process deposits may cause impulse line blockage.

How to Select a PDS883 Remote Seal DP Transmitter

When selecting a PDS883 remote seal differential pressure transmitter, confirm the following details:

1. Measurement purpose
   Confirm whether the transmitter is used for differential pressure, level, flow, filter monitoring, or pressure difference measurement.
2. Tank or process type
   For level measurement, confirm whether the tank is open, closed, pressurized, vacuum, or high-temperature.
3. Differential pressure range
   Confirm the required measuring span, normal differential pressure, and maximum differential pressure.
4. Static pressure
   Confirm the maximum process pressure on the high-pressure and low-pressure sides.
5. Medium characteristics
   Confirm whether the medium is crystallizing, precipitating, viscous, corrosive, dirty, toxic, or easy to block.
6. Process temperature
   Confirm minimum and maximum temperature. For -90°C to +400°C applications, filling fluid and capillary design must be checked carefully.
7. Remote seal type
   Confirm flange size, diaphragm size, sealing face, flange standard, pressure rating, and whether one side or both sides need remote seals.
8. Capillary length
   Confirm required capillary length and installation height difference. Long capillaries may affect response time and temperature influence.
9. Wetted material
   Select diaphragm and flange materials according to corrosion compatibility, such as SS316L, Hastelloy, tantalum, Monel, or PTFE-lined options.
10. Installation accessories
    Confirm whether flushing rings, gaskets, mating flanges, brackets, cable glands, or protective capillary supports are required.

Remote Seal DP Transmitter Accessories for PDS883 Installation

Depending on site conditions, the PDS883 may be used with different accessories:

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

For crystallizing, precipitating, viscous, corrosive, or high-temperature media, proper diaphragm seal material, filling fluid, gasket material, and flushing structure are especially important.

Typical dual remote seal level installation:

Lower Vessel Flange → Gasket → Remote Diaphragm Seal → Capillary → DP Transmitter

Upper Vessel Flange → Gasket → Remote Diaphragm Seal → Capillary → DP Transmitter

If flushing rings are required:

Process Flange → Gasket → Flushing Ring → Gasket → Remote Diaphragm Seal

PDS883 Remote Seal DP Transmitter vs Standard Differential Pressure Transmitter

For clean media and normal temperatures, a standard DP transmitter may be more economical. For difficult media, extreme temperatures, or closed tank level measurement, a remote seal DP transmitter is often more reliable.

PDS883 Remote Seal Differential Pressure Transmitter Supplier Support from SIYelectric

SIYelectric supplies PDS883 remote seal differential pressure transmitters for industrial projects, replacement orders, and process instrumentation procurement. We can help check model codes, review datasheets, confirm diaphragm seal structure, select filling fluid, match installation accessories, and prepare quotations based on actual site conditions.

For accurate quotation, please provide:

• measurement purpose: DP, level, or flow
• differential pressure range
• static pressure
• process medium
• process temperature range
• tank type and installation position
• flange size and standard
• diaphragm and wetted material requirement
• capillary length
• output signal and display requirement
• explosion-proof or certification requirement
• whether flushing rings or special gaskets are required

SIYelectric can also support related accessories such as flushing rings, mating flanges, PTFE gaskets, spiral wound gaskets, flanged reducers, mounting brackets, explosion-proof cable glands, capillary protection parts, 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.