24
FMT230, FMT250
THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B
… 6 Installation
Ambient conditions
Ambient temperature
•
Standard: −20
to 70
°C (−4
to 158 °F)
•
Optional (in preparation): −40
to 70
°C (−40
to 158 °F)
Relative humidity
Maximum 85
% RH, annual average ≤
65 % RH
IP rating
In accordance with EN 60529: IP 65 / IP 67
NEMA IP rating
NEMA 4X
Process conditions
Note
When using the device in potentially explosive atmospheres,
note the additional temperature data in
Use in potentially
explosive atmospheres in accordance with ATEX and IECEx
on
page 6 and
Use in potentially explosive atmospheres in
accordance with FM and CSA
on page 12 beachten!
Measured medium temperature
Devices with ceramic element and flange connection
• Standard and explosion-proof design:
−20
to 150
°C (−4
to 302 °F)
• High temperature design:
−20
to 300
°C (−4
to 572 °F)
• DVGW design:
0 to 70°C (32 to 158 °F)
The approved measuring medium temperature T
medium
also
depends on the selected sensor connection and the design of
the pipe components.
The following temperature specifications apply:
Sensor connection
T
medium
Threaded connection DIN 11851
−
20 to 150
°C (−4
to 302 °F)
Clamp ring fitting
−
20 to 150
°C (−4
to 302 °F)
Pipe components with ball valve
Maximum 150 °C (302 °F)
Integrated hot tap fitting
See
Integrated hot tap fitting
on
page 25
Maximum operating pressure
Sensor connection
Maximum measuring medium
pressure P
medium
Flange in accordance with
DIN EN 1092, PN 40
4 MPa, 40 bar (580 psi)
Threaded connection DIN 11851
1.6 MPa, 16 bar (232 psi)
Clamp ring fitting
2 MPa, 20 bar (290 psi)
Integrated hot tap fitting
See
Integrated hot tap fitting
on
page 25
Pressure loss
A
Pressure loss
B
Mass flow
Figure 9: Pressure loss in logarithmic representation
