The Endress+Hauser Deltabar PMD78B is a heavy-duty smart differential pressure transmitter engineered to master severe processes where traditional direct-mount instruments fail. Designed for extreme thermodynamic environments—such as high-vacuum distillation columns, corrosive chemical reactors, and high-pressure steam lines—this specialized transmitter utilizes a remote capillary diaphragm seal system to isolate sensitive electronics from destructive process conditions.
At the core of the PMD78B’s performance is the patented TempC (Temperature Compensated) Membrane Technology. While standard remote seals suffer severe zero-point shifts due to the volumetric expansion of internal fill-fluids under radiant heat or solar exposure, the TempC membrane dynamically absorbs these variations. This delivers ultra-low temperature coefficients, drastically minimizes drift, and cuts baseline recovery times after Clean-in-Place/Steam-in-Place (CIP/SIP) thermal shocks by up to 50%.
| Metrological / Structural Feature | Engineered Performance Details |
|---|---|
| Reference System Accuracy | Up to ±0.075% (Total system accuracy including capillary diaphragm effects) |
| Process Temperature Envelope | -70°C to +400°C (-94°F to +752°F) continuous thermal tolerance |
| Static Line Pressure Max | Up to 160 bar (2,400 psi) maximum operational line limit |
| Measuring Range Limits | 100 mbar to 40 bar (1.5 psi to 600 psi) continuous span flexibility |
| Diaphragm Membrane Options | Patented TempC Membrane (Standard/Platinum configurations) |
| Wetted Process Materials | 316L Stainless Steel, Alloy C, Tantalum, Monel, Gold-coated, PTFE-coated layers |
| Digital Protocols Stack | 4-20mA HART, PROFIBUS PA, PROFINET (Ethernet-APL supported), Secure Bluetooth® |
When implementing remote seal systems like the Deltabar PMD78B on high-altitude process vessels, the physical mass of the fill-oil within the capillaries generates a constant hydrostatic pressure offset. Follow this standard operational sequence during field commissioning to execute a zero-point correction:
Isolate the transmitter from the live process flow by shutting down the vessel nozzles block valves. Ensure both the high-pressure (HP) and low-pressure (LP) remote diaphragm membranes are brought to a true, equalized atmospheric state or identical blanket conditions.
Launch the Endress+Hauser SmartBlue App on an authorized field tablet. Connect via the encrypted Bluetooth® interface to the PMD78B transmitter core. Verify that configuration passcodes match your local nameplate parameters.
Navigate to the Guided Setup menu and trigger the 'Position Zero Adjustment' command. The internal micro-processor will immediately read the oil-mass gravity head and re-calibrate the baseline to 0.000, eliminating installation density errors without warping the calibrated upper sensor range span.
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Get a Technical Price Quote in 2 HoursA: Conventional remote seals expand heavily when heated by hot fluids or direct sunlight, creating false pressure readings. The TempC (Temperature Compensated) membrane utilizes a unique mechanical design that absorbs fill-fluid expansion internally, minimizing measurement drift and drastically reducing recovery wait times after thermal flushes (CIP/SIP).
A: Yes. Combined with specific high-temperature vacuum fill-oils and proper wetted metals (such as Tantalum or Gold-coatings), the PMD78B remote seal assembly delivers reliable and stable level monitoring in harsh vacuum distillation columns.
A: Yes. All shipped instruments are 100% original, brand-new factory builds. They are fully accompanied by original serial numbers, traceable calibration sheets, and complete EN 10204 3.1 Material Test Certificates (MTC) to pass stringent plant audits.
