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3151DP Differential Pressure Transmitter
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3151DP Differential Pressure Transmitter
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The 3151DP Differential Pressure Transmitter is a smart DP transmitter designed for measuring differential pressure in liquid, gas, and steam applications. It converts the measured differential pressure into a standard 4–20 mA DC output with HART communication, with optional fieldbus communication such as FF or PROFIBUS PA depending on configuration.
With a compact and rugged structure, local LCD display, zero and span adjustment, adjustable damping, modular electronics, anti-interference design, and 316L stainless steel wetted parts, the 3151DP is suitable for flow measurement, liquid level measurement, filter differential pressure monitoring, vacuum measurement, and process pressure difference applications.
The 3151DP differential pressure transmitter is an intelligent field instrument used to measure the pressure difference between two process points. It is commonly applied in industrial automation systems for differential pressure measurement, flow measurement, level measurement, vacuum measurement, and density-related measurement.
In process plants, differential pressure transmitters are widely used with impulse lines, manifolds, or primary elements. The 3151DP converts the measured DP signal into a 4–20 mA DC analog output and supports HART communication for remote configuration, monitoring, and maintenance.
It can be connected to a PLC, DCS, HART handheld communicator, or upper-level host system, allowing users to configure output parameters according to different site requirements.
The 3151DP smart differential pressure transmitter supports standard analog output and optional digital communication.
| Output Type | Description |
|---|---|
| 4–20 mA DC + HART | Analog DP output with digital communication for configuration and diagnostics |
| EPA / FF / PROFIBUS PA | Optional full digital fieldbus communication for pressure, temperature, and percentage range data |
For most industrial DP measurement loops, 4–20 mA with HART is the most commonly used signal because it is compatible with many existing PLC and DCS systems while still supporting smart parameter setting and diagnostics.
The 3151 series provides multiple sensor ranges for flexible project selection. For differential pressure applications, the available range can cover:
This allows the transmitter to be used in low DP applications, flow measurement, tank level measurement, and higher differential pressure conditions depending on the selected sensor.
The transmitter uses a compact field housing and robust sensor structure. It is designed for industrial environments where vibration, mechanical stress, and harsh field conditions may exist.
The transmitter supports local zero and span adjustment, helping technicians simplify commissioning, calibration, and field maintenance.
Local configuration buttons on the transmitter housing allow users to adjust zero point, span, and LCD display parameters conveniently. This is useful when quick field configuration is required.
The local digital display can show several operating values in a cyclic mode, including:
This helps operators check field status directly at the instrument.
The damping time can be adjusted to smooth output signals when the process pressure fluctuates, such as in flow measurement, pump systems, or gas lines.
Solid plug-in printed circuit boards and modular electronics help simplify troubleshooting, reduce spare parts inventory, and improve service convenience.
The transmitter includes independent electromagnetic interference protection and software anti-interference design, improving reliability in industrial environments with electrical noise, motors, inverters, and long signal cables.
An internal temperature sensor improves compensation for ambient and process temperature influence. It can also provide temperature information related to the sensor body and contacted medium.
The wetted parts are made of 316L stainless steel, suitable for many common liquids, gases, and steam applications. For corrosive media, special material options or remote diaphragm seals should be considered.
| Item | Specification |
|---|---|
| Product Name | 3151DP Differential Pressure Transmitter |
| Product Type | Smart Differential Pressure Transmitter |
| Measured Media | Liquid, Gas, Steam |
| Main Measurement Type | Differential Pressure |
| Differential Pressure Range | 0–0.05 kPa to 7 MPa |
| Series Gauge Pressure Range Option | 0–0.15 kPa to 42 MPa |
| Series Absolute Pressure Range Option | 0–40 kPa to 7 MPa |
| Output Signal | 4–20 mA DC + HART |
| Optional Digital Output | EPA, FF, PROFIBUS PA |
| Medium Temperature at Sensor Contact | -40°C to +85°C |
| Display Parameters | DP Value, Output Current, Percentage Range, Sensor/Medium Temperature |
| Local Configuration | Zero, Span, LCD Display Parameters |
| Main Configuration Functions | Zero Migration, Range, Unit, Damping, Alarm, Current Calibration, Write Protection, Output Function, Factory Data Recovery |
| Wetted Material | 316L Stainless Steel |
| Structure | Sensor Module + Electronic Circuit Module |
| Typical Applications | DP Measurement, Flow, Level, Filter Monitoring, Vacuum, Density-Related Measurement |
The 3151DP differential pressure transmitter is mainly used for measuring pressure difference between two process points.
| Measurement Type | Range |
|---|---|
| Differential Pressure | 0–0.05 kPa to 7 MPa |
This range makes the 3151DP suitable for applications such as:
Although the 3151 series platform can include gauge pressure and absolute pressure versions, the 3151DP should be positioned mainly as a differential pressure transmitter page.
The 3151DP differential pressure transmitter is designed to support convenient field operation. The local display and configuration functions allow operators to check important data and perform basic settings directly at the instrument.
| Display / Setting Item | Function |
|---|---|
| Differential Pressure Value | Shows real-time DP measurement |
| Output Current | Shows 4–20 mA analog output value |
| Percentage Range | Shows DP as percentage of configured span |
| Sensor / Medium Temperature | Shows temperature information near the sensor |
| Zero Adjustment | Used for zero correction after installation |
| Span Adjustment | Used for measuring range setting |
| Damping Setting | Used to smooth output under fluctuating DP |
| Unit Setting | Used to select engineering unit according to project requirement |
This is useful during installation, commissioning, loop checking, routine inspection, and troubleshooting.
The 3151DP smart differential pressure transmitter consists mainly of a sensor module and an electronic circuit module.
The sensor section includes:
The electronics section includes:
During operation, high-pressure and low-pressure process signals act on the sensor module. The differential pressure signal is processed by the microprocessor, compensated with temperature and characterization data, and converted into a 4–20 mA DC output signal with digital communication capability.
In simple terms:
High / Low Process Pressure → DP Sensor Module → Digital Processing → 4–20 mA DC / HART Output
The 3151DP can be used with orifice plates, venturi tubes, flow nozzles, pitot tubes, and other DP primary elements to measure liquid, gas, or steam flow.
Used for tank and vessel level measurement by measuring hydrostatic pressure difference. For closed or pressurized vessels, differential pressure measurement can help compensate top pressure.
Suitable for monitoring pressure drop across filters, strainers, membranes, bag filters, and dust collectors. Increasing DP can indicate clogging or maintenance demand.
Applied in reactors, pipelines, separators, distillation columns, pumps, filters, and process equipment where differential pressure monitoring is required.
Used in boiler systems, feedwater systems, steam flow measurement, condensate systems, and turbine auxiliary systems.
Used for filtration systems, pump differential pressure, membrane systems, desalination equipment, wastewater treatment, and water distribution processes.
Can be used for air duct pressure difference, fan pressure, filter pressure drop, and ventilation system monitoring when the selected DP range is suitable.
When selecting a 3151DP differential pressure transmitter, confirm the following details:
Depending on site conditions, the 3151DP differential pressure transmitter may be used with:
For flow measurement, the transmitter should be matched with a suitable primary element such as an orifice plate, venturi tube, flow nozzle, or pitot tube.
For high-temperature steam, dirty media, crystallizing fluids, or corrosive service, installation accessories should be selected together with the transmitter model.
| Item | 3151DP Differential Pressure Transmitter | Remote Seal Differential Pressure Transmitter |
|---|---|---|
| Pressure Transfer | Impulse lines or manifold connection | Diaphragm seals and capillaries |
| Suitable Media | Clean liquid, gas, steam | Corrosive, viscous, crystallizing, high/low temperature media |
| Installation Cost | Usually lower | Usually higher |
| Response | Generally faster | May be affected by capillary length and fill fluid |
| Maintenance | Impulse lines may require cleaning | Reduces impulse line blockage risk |
| Typical Use | Flow, DP, filter monitoring, level | Difficult media level and DP measurement |
For clean media and standard process conditions, the 3151DP is usually a practical and economical choice. For crystallizing, viscous, corrosive, or high-temperature media, a remote seal DP transmitter may be more suitable.
SIYelectric supplies 3151DP differential pressure transmitters for industrial projects, replacement orders, and process instrumentation procurement. We can help check model codes, review technical parameters, confirm DP range and static pressure, match installation accessories, and prepare quotations based on actual operating conditions.
For accurate quotation, please provide:
SIYelectric can also support related DP transmitter accessories such as 3-valve manifolds, 5-valve manifolds, mounting brackets, impulse tubing, fittings, condensate pots, cooling elements, explosion-proof cable glands, gaskets, and HART communicators.
Available documents may include technical datasheet, certificate of conformity, inspection report, packing list, and commercial invoice, depending on order and project requirements.
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