Endress Hauser Differential Pressures Transmitter

PMD75 Endress Hauser Differential Pressures Transmitter

The Endress Hauser Differential Pressures Transmitter is a transmitter that measures the pressure difference between the two ends of the transmitter, and outputs a standard signal (such as 4~20mA, 0~5V). Differential pressure transmitters are different from ordinary pressure transmitters in that they all have two pressure ports.

Differential pressure transmitters are generally divided into positive pressure terminals and negative pressure terminals. The pressure at the end should be greater than the pressure at the negative pressure section to be measured.

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Features

  • Best accuracy, reproducibility and long-term stability
  • Highest safety due to gas tight feedthrough with capabilities up to SIL2/3, certified to IEC 61508
  • Easy menu-guided commissioning via local display, 4 to 20mA with HART, PROFIBUS PA, FOUNDATION Fieldbus
  • Histo ROM data management concept for fast and easy commissioning, maintenance and diagnostics
  • Cost savings with modular concept for easy replacement of sensor, display or electronics
  • Overload-resistant up to 420bar / 42MPa / 6300psi, function- monitored
  • Seamless and independent system integration (HART/PA/FF)

 

Application

  • Automated industry
  • monitor pressure changes
  • Measure the pressure difference across the transmitter
  • Measurement and control of parameters such as pressure
  • Electric power automation 50/60Hz AC current measurement

 

Specification

Parameter Value
Measuring principle Differential pressure
Characteristic Digital transmitter with metallic measuring diaphragms Modular transmitter

Long-term stability

High static pressure/Overload resistance Secondary process barrier
Supply voltage 4…20 mA HART

10,5…45V DC (Non Ex): Ex ia: 10,5…30V DC PROFIBUS PA:

9…32 V DC (Non Ex)

FOUNDATION Fieldbus: 9…32 V DC (Non Ex)
Reference Accuracy Standard: 0.05% Platinum: up to 0.035%
Long term stability 0.03 % of URL/ year

0.05 % of URL/ 5 years

0.08 % of URL/ 10 years
Process temperature -40°C…85°C

(-40°F…185°F)
Ambient temperature -50°C…85°C

(-58°F…185°F)
Measuring cell 10 mbar…250 bar

(0.15 psi…3750 psi)
Smallest calibratable span 1 mbar (0.015 psi)
Vacuum resistance 50 mbar (0.73 psi)
Max. Turn down 100:1
Max. overpressure limit On one side:

420 bar (6300psi)
Process connection 1/4-18NPT RC1/4″
Material process membrane 316L, AlloyC, Tantal,

Gold-Rhodium
Material gasket Viton, PTFE, EPDM, NBR
Fill fluid Silicone oil Inert oil
Material housing 316L, Die-cast aluminum
Communication 4…20 mA HART PROFIBUS PA

FOUNDATION Fieldbus
Certificates / Approvals ATEX, FM, CSA, CSA C/US, IEC Ex, INMETRO, NEPSI, EAC, UK

Ex

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