E&H PMD55B pressure transmitter

E&H PMD55B pressure transmitter

Product Overview

The E&H Deltabar PMD55B is a differential pressure transmitter featuring a welded metallic membrane measuring cell with fill fluid for pressure transfer [4†L10-L12]. Designed for differential pressure, level and flow measurement in liquids and gases, this device belongs to the new Deltabar generation and is engineered for exceptional robustness and ease of operation [7†L2-L7]. The transmitter supports both local operation and remote wireless control via a secure Bluetooth connection using the SmartBlue App, enabling condition-based maintenance that significantly increases efficiency in technical service [3†L8-L10].

One of the key differentiators of the PMD55B platform is its integrated digital assistant. Intuitive wizards guide users through commissioning, proof testing and device locking, minimizing operating errors and reducing systematic failures [6†L13-L15]. An RFID tag is embedded in the housing for easy identification, while the device supports optional Bluetooth wireless technology for maintenance and monitoring without interrupting the process [6†L24-L26][6†L17-L19].

Key Technical Specifications

Environmental & Process Conditions

Electrical & Communication

The current output offers three selectable operating modes: 4.0 to 20.5 mA, NAMUR NE 43 (3.8 to 20.5 mA, factory setting), and US mode (3.9 to 20.8 mA) [12†L9-L10]. Alarm signals can be set with maximum alarm configurable from 21.5 to 23 mA, while the minimum alarm is factory-set below 3.6 mA [12†L11-L12]. The device also features a linearization function that allows the measured value to be converted to any units of height or volume, supporting user-defined tables of up to 32 value pairs [12†L20-L23].

Long-Term Stability & Reliability

Wetted Materials

Process Connections

The PMD55B supports multiple process connection standards to accommodate diverse installation requirements: NPT 1/4–18, RC1/4″, G1/2, and NPT1/2, with flanged versions also available for specific applications [6†L32-L33][10†L13-L14].

Housing & Electrical Connection

The standard housing is single compartment aluminium, coated (AlSi10Mg), offering robust protection for harsh industrial environments [21†L27]. Electrical connection options include gland M20 (plastic) with IP66/IP68 NEMA Type 4X/6P rating, as well as thread NPT1/2 variants with the same ingress protection classification [10†L9-L11][8†L16-L17].

Approvals & Certifications

PMC71B-BABAABA6A3CAAAAAJD – Order Code Breakdown

The order code defines the exact configuration of the device for procurement and traceability. The following breakdown applies to the PMC71B Cerabar pressure transmitter model [3†L20-L21]. Note that while PMC71B shares a similar coding logic, the full official code table should be referenced for absolute accuracy.

PMD55B Complete Configuration Example

The following order codes illustrate the configurability of the PMD55B platform:

PMD55B-BABACBA37BAASAJA1B – This configuration features an ATEX/IECEx Ex ia IIC T6 Ga approval with a 2-wire 4-20mA HART output and a segment display without buttons. The housing is single compartment, aluminium coated with a gland M20 plastic electrical connection rated IP66/68 NEMA Type 4X/6P. The pressure type is differential with a 10 mbar (0.15 psi) sensor range, featuring nominal value calibration and a horizontal impulse line installation with left side high pressure and side vent. The process connection is NPT 1/4–18 IEC61518 UNF7/16–20 (316L) with a 316L membrane, silicone oil fill fluid and PTFE seal [10†L3-L15].

PMD55B-NAFACBA37BAASAJA1B – This variant includes a NEPSI Ex ia IIC T6 Ga approval and communicates via PROFINET over Ethernet-APL at 10 Mbit/s. Other configuration parameters follow a similar differential pressure specification with a 10 mbar sensor range [22†L3-L15].

PMD55B-KRBAABA37BAASAJA1B – Designed for non-hazardous areas with KC marking, this version uses a 2-wire 4-20mA HART output and features no local display, relying entirely on communication for operation [23†L3-L15].

Key Features & Benefits

Condition-based maintenance – The PMD55B enables predictive maintenance strategies, significantly increasing technical service efficiency [3†L8-L10].

Bluetooth wireless operation – Secure remote configuration and monitoring via the SmartBlue App allows device access without physical proximity, reducing on-site accidents and protecting equipment in hard-to-reach areas [6†L17-L19].

Integrated digital assistants – Wizards guide users through commissioning, proof testing and SIL deployment, reducing errors and enabling straightforward SIL2/SIL3 applications [6†L19-L20][7†L18-L19].

Undervoltage detection – Built-in monitoring prevents dangerous plant conditions and the transmitting of frozen current values, maximizing process reliability [7†L13-L14].

Multiple communication options – Available with 4-20mA HART (2-wire) and PROFINET over Ethernet-APL, ensuring seamless integration into both legacy and modern automation infrastructures [5†L11-L12].

Plug-and-play functionality – Integrated HistoROM data module enables easy management of process and device parameters [3†L38-L39].

RFID tag – Embedded for easy device identification during maintenance rounds [6†L24-L25].

Applications

The Deltabar PMD55B is suitable for a wide variety of differential pressure measurement tasks across process industries and environmental applications:

Conventional filter monitoring – Detecting pressure drops across filter elements [7†L7-L8].

Low differential pressure measurement – Monitoring towers and columns with extremely low pressure differences [7†L8-L9].

Hydrostatic level measurement – Continuous level monitoring in vessels and tanks [7†L9-L10].

Differential pressure flow measurement – Measuring volume or mass flow using primary flow elements [7†L10-L11].

Pump differential pressure monitoring – Tracking pump performance and wear [14†L14-L15].