Measure What Matters — Down to the Last Pascal
A differential pressure transmitter converts the pressure difference across pipes, vessels, filters, and flow elements into a precise electrical signal, enabling accurate monitoring of flow rate, liquid level, and system health across demanding industrial environments.
The pressure transmitter range covers capacitive, piezoresistive, and strain-gauge variants with outputs including 4-20 mA, HART, PROFIBUS, and Foundation Fieldbus, spanning from a few millibar up to several hundred bar. Models are available for gases, liquids, and steam across varied process conditions.
Dutco Tennant LLC is a leading supplier of instrumentation and process measurement solutions across the UAE and GCC, serving oil and gas, water treatment, power generation, and facilities management projects.
Precision Measurement Where Processes Cannot Afford Error
- The differential pressure transmitter pairs with orifice plates, venturis, or pitot tubes for consistent, repeatable flow rate readings
- Stainless steel wetted parts on the stainless differential pressure transmitter resist corrosive media in aggressive chemical and process environments
- Wide turndown ratios of up to 100:1 allow a single unit to cover broad operating ranges without hardware changes
- Low-power two-wire 4-20 mA loop operation reduces installation costs and simplifies control panel integration
- ATEX and IECEx certifications make these instruments fit for hazardous area classification in offshore, petrochemical, and refinery zones
Intelligent Features That Keep Processes Running
- Square Root Extraction: Built-in flow linearisation converts raw differential readings directly to volumetric flow without external computation
- One-Touch Programming: The dp 4000 pressure transmitter allows span and zero configuration via a single button and backlit display, without test pressure
- Multilingual Display: Engineering units, bargraph output, and live mA values shown simultaneously for on-site readability
- Chemical Seal Options: Remote diaphragm seals isolate the sensing element from viscous, crystallising, or highly corrosive process fluids
- Long-Term Stability: Drift rates below 0.1% FS per year on the stainless steel differential pressure sensor reduce recalibration intervals and lower lifecycle costs
Types
Capacitive Differential Pressure Transmitters
The capacitive type uses diaphragm displacement to change capacitance between electrodes, delivering accurate and stable readings for critical process control.
- High sensitivity across low to medium pressure ranges
- Minimal hysteresis with excellent long-term repeatability
- Compatible with HART and Foundation Fieldbus digital protocols
Piezoresistive Differential Pressure Transmitters
Piezoresistive models use silicon sensing elements that change resistance under stress, delivering fast response for dynamic processes.
- Suitable for rapidly changing differentials in compressors and pumps
- High overload tolerance without permanent zero shift
- Compact body with robust process connection options
Flanged Differential Pressure Transmitters
Flanged units mount directly to tank walls or large-diameter pipelines via standardised flange connections for secure, leak-free integration.
- Handles high-pressure and high-temperature process conditions reliably
- Resistant to vibration and mechanical shock in heavy industrial installations
- Available in flat, single, or double flange configurations for remote seal setups
Strain-Gauge Differential Pressure Transmitters
Strain-gauge models bond sensing elements to an elastic substrate, suitable for HVAC, general water supply, and mechanical equipment monitoring.
- Cost-effective for standard accuracy requirements in moderate conditions
- Compatible with water, air, and non-corrosive gases
- Standard two-wire 4-20 mA output for simple wiring
All-Stainless Differential Pressure Transmitters
The industrial differential pressure transmitter in full SS316L construction covers food, dairy, offshore, and petrochemical applications demanding corrosion resistance.
- Meets hygienic and sanitary connection standards for food and life sciences
- Withstands aggressive wash-down and clean-in-place procedures
- ATEX and IECEx certified variants available for Zone 0 and Zone 1 areas
Standout Features & Benefits
Robust All-Stainless Housing
- SS316L diaphragm and housing resist chloride-induced corrosion in coastal and offshore environments
- IP65 to IP68 ingress protection keeps moisture and dust away from sensitive electronics
- Welded construction eliminates potential leak paths at housing joints
Multi-Protocol Signal Outputs
- HART 7.0 enables simultaneous analogue and digital communication over the same two wires
- PROFIBUS and Foundation Fieldbus options integrate directly into DCS and SCADA architectures
- 4-20 mA output remains immune to electrical noise across extended cable runs
High Accuracy Across Wide Spans
- Basic accuracy of 0.075% FS, with options reaching 0.065%, supports critical metering and custody transfer
- Turndown ratios up to 100:1 eliminate the need for multiple instruments at a single measurement point
- Temperature compensation circuitry maintains accuracy from -20°C to +85°C
Certifications for Hazardous Areas
- ATEX II1G Ex ia IIC T6 Ga approval covers intrinsically safe operation in explosive gas atmospheres
- IECEx certification aligns with international standards for global project compliance
- SIL-rated variants support safety instrumented systems in process plants
Application Areas
Oil, Gas & Petrochemical Plants
- Monitors pressure differentials across separators, heat exchangers, and knock-out drums in upstream and downstream operations
- Flow measurement through orifice plates in custody transfer and allocation metering
- Filter and strainer clog detection in crude, condensate, and refined product lines
Water & Wastewater Treatment
- Tracks filter bed loading in sand filters, ultrafiltration membranes, and reverse osmosis trains
- Measures hydrostatic level in open and pressurised tanks using a single transmitter
- Controls pump duty cycles by monitoring differential head across pump stations
Power Generation & Utilities
- Steam flow measurement across boiler systems using the industrial differential pressure transmitter with orifice or annular primary elements
- Differential monitoring of cooling water and lube oil in turbines and generators
- Condenser pressure measurement for thermal efficiency optimisation
HVAC & Building Management Systems
- Maintains correct pressure differentials in cleanrooms, operating theatres, and pharmaceutical manufacturing suites
- Monitors airflow across fan coil units, AHUs, and variable air volume boxes
- Filter health tracking across HVAC ductwork to schedule maintenance before airflow is compromised
