Output variables (continued)
Speed of transmission
31.25 kbit/s
Signal encoding
Manchester II
Signal on alarm
The following applies for the duration of a fault:
• Red LED lights up permanently
• Totalizer remains at the last calculated value
• Status “BAD” in the cyclic data telegram
Galvanic isolation
The electrical connections are galvanically isolated from the sensor.
Measuring accuracy
Reference conditions
Error limits based on ISO/DIN 11631:
• 20...30 °C, 2...4 bar
• Calibration rig traceable to national standards
Measured error
Liquids < 0.75% o.r. for Re >20000
< 0.75% o.f.s. for Re 4000...20000
Gas / steam < 1% o.r. for Re >20000
< 1% o.f.s. for Re 4000...20000
Current output temperature coefficient < 0.03% o.f.s./Kelvin
Repeatability
≤ ±0.25% o.r.
Operating conditions
Installation instruction
Any position (vertical, horizontal)
For limitations and other recommendations see page 10
Inlet / outlet sections
Inlet section: minimum 10 x DN
Outlet section: minimum 5 x DN
(For detailed information on the relationship between pipe installation and
pipe internals see page 10)
Ambient temperature
–40...+60 °C
When mounted outside, it is recommended that it is protected
from direct sunlight by a sun shade, especially in warm climates
with high process temperatures.
Ingress protection
IP 67 (NEMA 4X)
Shock and
vibration resistance
At least 1 g in every axis over the whole frequency range up to 500 Hz
Electromagnetic
compatibility (EMC)
To EN 50081 Part 1 and 2 / EN 50082 Part 1 and 2 and NAMUR industrial
standard
Process conditions
Process temperature
• Fluid: Standard sensor –40...+260 °C
High/low temperature sensor –200...+400 °C
Wafer type instruments of sizes DN 100 (4") and
DN 150 (6") may not be mounted in orientation
according to position B (see page 10) for fluid
temperatures above 200 °C.
• Seal: Graphite –200...+400 °C
Viton – 15...+175 °C
Kalrez – 20...+220 °C
Gylon (PTFE) –200...+260 °C
9 Technical Data Prowirl 77 PROFIBUS-PA
56 Endress+Hauser
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