Endress+Hauser PMD75-1QA7F13DCAU Deltabar Differential Pressure Transmitter 0-500 mbar

Overview

The Endress+Hauser PMD75 Deltabar is a digital differential pressure transmitter built on the capacitive ceramic or metallic sensor cell platform used across the Cerabar/Deltabar S family, and this configuration, order code PMD75-1QA7F13DCAU, is factory-calibrated to a 0-500 mbar differential range. That narrow, low-end span makes the instrument especially well suited to applications where small pressure differentials carry critical process information: filter differential monitoring, low-flow orifice and venturi measurement, and closed-tank level applications where only a few millibars separate normal operation from an alarm condition.

As the official authorized partner and exclusive regional representative for Endress+Hauser, Seven Star LLC proudly supplies the PMD75 Deltabar to water treatment plants, HVAC contractors, and process industries across the Sultanate of Oman, Muscat, and the wider GCC region. Specifying the PMD75 through Seven Star LLC ensures a genuine, factory-calibrated instrument backed by local warranty, spares availability, and commissioning support that grey-market channels cannot provide.

Measurement Principle

The PMD75 measures differential pressure by applying the high-side and low-side process pressures across opposite faces of an internal diaphragm, which deflects in proportion to the pressure difference between the two ports. This deflection changes the capacitance of an internal measuring cell, and the transmitter’s digital electronics convert that capacitance change into a precise electrical signal representing the differential pressure, independent of absolute line pressure fluctuations.

Because the PMD75 measures the differential directly at the sensor rather than deriving it from two separate absolute measurements, it eliminates the subtraction error that would otherwise dominate a low-range 0-500 mbar reading, delivering reference accuracy of up to 0.075% of the calibrated span. This direct-measurement approach also gives the PMD75 excellent long-term stability and a fast response time, both essential when the transmitter is being used to protect equipment through filter differential alarms or to drive tight closed-loop flow control.

Engineering Design of the Endress+Hauser PMD75

The PMD75 uses a two-chamber transmitter housing, available in aluminum or stainless steel, that physically separates the terminal compartment from the electronics compartment so that field wiring can be serviced without exposure to the measuring circuitry. The process wetted parts and diaphragm seal materials are selected at the point of order to match the process medium, and the instrument supports both direct process connection and remote-seal configurations depending on the installation.

A backlit local display with a four-key operating concept allows field engineers to configure the zero and span, apply damping, and read diagnostic information without a separate handheld communicator, while the HART-based 4-20mA output integrates directly with existing control loops. This on-site configurability is a major reason plant engineers specify the Endress+Hauser PMD75 for retrofit projects where minimizing commissioning time is a priority. The PMD75 is designed to IEC 61508 and can be applied in SIL2/SIL3 safety instrumented functions, an important consideration for differential pressure loops tied to plant protection systems.

Key Features

The Endress+Hauser PMD75 combines low-range differential accuracy with rugged industrial construction. Core capabilities include:

• Factory-calibrated 0-500 mbar differential pressure range suited to low-flow and filter monitoring duties.
• Reference accuracy of up to 0.075% of calibrated span for stable, drift-free low-range readings.
• Direct differential measurement that avoids the subtraction error inherent in dual absolute-pressure setups.
• Two-chamber aluminum or stainless steel housing isolating wiring from sensitive electronics.
• Local backlit display with four-key configuration for on-site zero, span, and damping adjustment.
• SIL2/SIL3-capable design per IEC 61508 for use in safety instrumented systems.
• HART-compatible 4-20mA output for seamless integration with existing DCS and PLC platforms.
• Broad selection of wetted materials and remote-seal options to match aggressive or hygienic media.

Industrial Applications

The narrow 0-500 mbar span of this Endress+Hauser PMD75 configuration makes it a natural fit for filter differential pressure monitoring in Oman’s district cooling plants, RO desalination pretreatment trains, and HVAC air-handling systems, where clogged filters must be detected well before they compromise system performance. The same low-range sensitivity is widely used for low-flow orifice plate and venturi flow measurement in utility and process water networks across the GCC, and engineers across the region increasingly standardize on the Endress+Hauser PMD75 for these low-differential duties because of its long-term stability and minimal recalibration requirements.

As the officially authorized partner for Endress+Hauser, Seven Star LLC distributes the Deltabar PMD75 to EPC contractors and plant operators throughout the Sohar and Salalah economic zones, supporting closed-tank level measurement, blanket gas pressure monitoring, and burner management differential interlocks. Facility engineers across the region rely on Seven Star LLC for both the initial specification of the correct calibrated range and the long-term parts and calibration support that follows commissioning.

Technical Specifications

Full technical parameters for the Endress+Hauser PMD75 differential pressure transmitter, order code PMD75-1QA7F13DCAU, are summarized below to help engineers confirm the Endress+Hauser PMD75 matches their process requirements before submitting a purchase order:

Call To Action

To submit a formal Request for Quote (RFQ), confirm regional stock availability, or obtain the complete technical datasheet for the Endress+Hauser PMD75-1QA7F13DCAU Deltabar differential pressure transmitter, please contact the instrumentation division at Seven Star LLC today. As the authorized partner for Endress+Hauser in Oman and the GCC, our engineers are ready to support specification, sourcing, and commissioning of your differential pressure measurement project.