Technical data Cubemass DCI MODBUS RS485
90 Endress+Hauser
10.1.9 Operating conditions: Process
Medium temperature range Sensor
• –50 to +200 °C (–58 to +392 °F)
Seals (only for mounting sets with threaded connections):
• Viton: –15 to 200 °C (–5 to +392 °F)
• EPDM: –40 to +160 °C (–40 to +320 °F)
• Silicone: –60 to +200 °C (–76 to +392 °F)
• Kalrez: –20 to +275 °C (–4 to +527 °F)
Limiting medium pressure
range
(nominal pressure)
The material load diagrams (pressure-temperature diagrams) for the process connections are
provided in the separate "Technical Information" document on the measuring device in question.
This can be downloaded as a PDF file from www.endress.com. A list of the "Technical Information"
documents available is provided in the "Documentation" section → ä 94.
Pressure range of secondary containment
• 25 bar (362.5 psi)
Limiting flow → ä 83, "Measuring range"
The suitable nominal diameter is determined by optimizing the settings between the required flow
range and the permissible pressure loss. An overview of the maximum possible full scale values is
provided in the "Measuring range" section.
• The minimum recommended full scale value is approx. 1/20 of the max. full scale value.
• In most applications, 20 to 50% of the maximum full scale value can be considered ideal.
• Select a low full scale value for abrasive substances, such as liquids with entrained solids (flow
velocity < 1 m/s (< 3 ft/s)).
Pressure loss (SI units) Pressure loss depends on the fluid properties and on the flow rate.
The following formulas can be used to approximately calculate the pressure loss:
Reynolds number
A0003381
Re ≥ 2300
1)
A0003380
Re < 2300
A0003379
Δp = pressure loss [mbar]
ν = kinematic viscosity [m
2
/s]
g = mass flow [kg/s]
ρ = density [kg/m
3
]
d = inside diameter of measuring tubes [m]
K, K1 = constants (depending on nominal diameter)
1)
To compute the pressure loss for gases, always use the formula for Re ≥ 2300.
Re =
·d· ·
4·
g
p=K· · ·
0.25 1.75 –0.75
g
p=K1· ·g
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