Differential Pressure Transmitters (TM)
dP Flow Measurement or Static Pressure, Multi-Variable
Water, Waste Water, Air, Steam, Oil, Viscous Liquids & Gases
- Customization and wide range of brands available
Industry-Leading, Customizable dP Flow Transmitters
Differential pressure (dP) transmitters are precision instruments designed to measure the high and low pressure signals generated by a dP flow meter and convert them into a standardized 4–20 mA signal. This signal can be read directly as differential pressure or, with square root extraction enabled, expressed as flow rate.
Key Advantages of dP Transmitters:
- High Accuracy – Capable of measuring differential pressures as low as 0.1″ wc with reliable repeatability.
- Application Flexibility – Available for differential, gauge, and absolute pressure measurement, with options for materials, indicators, and electrical certifications.
- Ease of Maintenance – Typically paired with a 3-valve or 5-valve manifold, simplifying setup, zeroing, and removal for service or replacement.
- Process Adaptability – For dirty or viscous fluids, seals and capillaries protect against line plugging, while multivariable models compensate for changes in temperature and pressure in gas applications.
- Integration Ready – Designed to interface seamlessly with PLCs, SCADA systems, and other automation controls for process visibility and efficiency.
Compared to other flow measurement accessories, dP transmitters deliver a versatile, highly accurate solution that supports a broad range of fluid applications including water, wastewater, air, steam, oil, viscous liquids, and gases.
dP Transmitter Specifications
Produces reliable measurements and wide application flexibility.
• Static: Up to 6092 psi (420 bar)
• WirelessHART®
• FOUNDATION fieldbus
PROFIBUS PA and FOUNDATION Fieldbus platforms offering interchangeability and transmitter upgrade capabilities
0.2 … 2320 psi
dP Transmitter Brands Available
Brand Types
- ABB 266DSH Transmitter – Features in-field replaceable electronics with auto-configuration to improve uptime, along with a plug-and-play display that reduces maintenance time and costs.
- Emerson Rosemount 3051S Multivariable Transmitter – Designed with a coplanar flange for flexible installation and direct process mounting, enabling efficient, cost-effective deployment.
- Honeywell
- Yokogawa
- More brands also available
dP Transmitter Materials
Typical material selections for standard applications:
- Stainless Steel (316L SST) – The most common choice for standard applications, offering durability, corrosion resistance, and reliable performance across a wide range of process conditions.
Other options for material selection:
- Hastelloy (Alloy C-276) – Provides superior resistance to strong oxidizers, acids, and other aggressive chemicals.
- Tantalum – Exceptional corrosion resistance in highly acidic environments, making it ideal for harsh chemical processing.
- Gold-Plated 316L SST – Adds an extra layer of protection for processes requiring resistance to extremely corrosive media or trace contamination concerns.
dP Transmitter Certifications
NSF, NACE, hazardous location, see full specs at emerson.com for a complete list of certifications. SIL 2/3 certified to IEC 61508 by an independent 3rd party, NSF, NACE, hazardous location, see full specs for complete list of certifications for measurement of differential pressure.
PFS is a contributor to various international standards committees, fully supporting our staff’s memberships to these commissions.
Individual products follow relevant industry regulations, including requirements specific to the oil and gas, water/wastewater, and power generation industries.
PFS maintains the following certifications, standards & compliances:
- ISO 9001
- AGA
- ASME S & U
- API
- ANSI
- European Pressure Equipment Directive (PED)
Applications
Water & Wastewater Treatment
dP transmitters are widely used in municipal and industrial water systems to monitor and control flow in filtration, distribution, and treatment processes. Their precision ensures accurate measurement in applications ranging from clean water to sludge handling.
Industrial Processes
In industrial settings, dP transmitters provide reliable flow measurement for process liquids, steam, and compressed air. Their adaptability makes them ideal for operations handling viscous or dirty fluids, especially when paired with seals and capillaries.
Power & Energy
Power plants rely on dP transmitters for monitoring steam, cooling water, and chemical feed lines. With the ability to deliver accurate readings under variable conditions, they support safe, efficient, and cost-effective energy production.
Oil & Gas
From upstream extraction to refining and distribution, dP transmitters are essential for measuring liquid and gas flows under demanding conditions. Multivariable transmitters further improve accuracy by compensating for temperature and pressure changes.
Industry-Leading dP Flow Transmitter Manufacturer Since 1983
Four Decades of Proven Expertise
For over 40 years, Primary Flow Signal has specialized in differential pressure (dP) measurement solutions. Our transmitters are trusted across municipal, industrial, and process applications for their proven accuracy, durability, and consistent performance.
Custom Solutions & Support
Every application is unique, which is why PFS offers dP transmitters engineered to integrate seamlessly with Venturi meters, orifice plates, and other primary elements. Our team provides calibration, system integration, start-up training, and ongoing technical support to ensure precise flow measurement.
Certifications & Approvals
PFS dP transmitters are manufactured under ISO 9001 quality standards and can be supplied with ASME, PED, and Canadian Registration Number (CRN) compliance to meet global project requirements.
