Endress+Hauser prowirl 77 - 2 System Description; Prowirl 77 Measuring System

2 System Description
The Prowirl 77 vortex flowmeter measures the volumetric flow of steam, gases and liq-
uids for fluid temperatures in the range of –200...+400 °C and at nominal pressures of
up to PN 160 / ANSI class 600.
Prowirl 77 measures the volumetric flow at operating conditions. If the process
pressure and temperature are constant, Prowirl 77 can be programmed to supply the
flowrate in mass, energy or corrected volume units.
2.1 Prowirl 77 Measuring System
A measuring system consists of:
• Prowirl 77 transmitter
• Prowirl 77 W, Prowirl 77 F or Prowirl 77 H body
The Prowirl 77 transmitter is available in different versions. The transmitter versions
differ in the type of electrical output signals and digital communication capabilities.
This Operating Manual describes the “PROFIBUS-PA” version.
The Prowirl 77 transmitter is available in two other versions:
• Version: “PFM”
• Version: “4...20 mA” (optional with HART)
Operation of those versions is not included in this Operating Manual. Separate
Operating Manuals for those instruments are available on request.
Prowirl 77 W
(wafer)
DN 15...150
Prowirl 77 F
(flanged)
DN 15...300
(larger sizes
upon request)
Transmitter
Prowirl 77
ba037y10
Prowirl 77 H
(high pressure)
DN 15...150
Sensor
Fig. 1
Prowirl 77 measuring system
Prowirl 77 PROFIBUS-PA 2 System Description
Endress+Hauser 7