30 SensyMaster FMT430, FMT450 THERMAL MASS FLOWMETER | OI/FMT430/450-EN REV. B
… 6 Installation
… Installation conditions
Installation at high ambient temperatures
Figure 13: Mounting position at high ambient temperatures
Under high but permissible ambient temperatures, avoid
additional thermal stress from heat convection or radiation,
since these sources of heat may exceed the permissible ambient
temperature on the equipment surface.
If the device needs to be installed directly on a hot, horizontal
piping, we recommend installing it on the side. In such cases,
you should avoid installing it in the 12 o'clock position, otherwise
the warm air that rises up will cause additional heating of the
electronics.
Sensor insulation
Insulation
Figure 14: Isolation of the sensor
The sensor may be insulated as shown in Figure 13.
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
Measured medium temperature
Note
When using the device in potentially explosive atmospheres,
note the additional temperature data in Temperature data on
page 10!
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:
T
11851 −20 to 150 °C (−4 to 302
−20 to 150 °C (−4 to 302 °F)
Pipe components with ball valve
Maximum 150 °C (302
Integrated hot tap fitting
See
Material loads for process
connections on page 31
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