Endress+Hauser Prosonic M FMU40 - Installation Conditions

Prosonic M - FOUNDATION Fieldbus Installation
Endress+Hauser 21
3.3 Installation conditions
3.3.1 Installation conditions for level measurements
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• Do not install the sensor in the middle of the tank (3). We recommend leaving a distance between
the sensor and the tank wall (1) measuring 1/6 of the tank diameter.
• Use a protective cover, in order to protect the device from direct sun or rain (2).
• Avoid measurements through the filling curtain (4).
• Make sure that equipment (5) such as limit switches, temperature sensors, etc. are not located
within the emitting angle . In particular, symmetrical equipment (6) such as heating coils, baffles
etc. can influence measurement.
• Align the sensor so that it is vertical to the product surface (7).
• Never install two ultrasonic measuring devices in a tank, as the two signals may affect each other.
• To estimate the detection range, use the 3 dB emitting angle .
3.3.2 Installation in narrow shafts
1
234
5
6
1/6D
7
D
r
a
L
Sensor  L
max
r
max
FMU40 11° 5 m (16 ft) 0.48 m (1.6 ft)
FMU41 11° 8 m (26 ft) 0.77 m (2.5 ft)
FMU42 9° 10 m (33 ft) 0.79 m (2.6 ft)
FMU43 6° 15 m (49 ft) 0.79 m (2.6 ft)
FMU44 11 ° 20 m (66 ft) 1.93 m (6.3 ft)
In narrow shafts with strong interference
echoes, we recommend using an ultrasound
guide pipe (e.g. PE or PVC wastewater pipe)
with a minimum diameter of 100 mm (3.94 in).
Make sure that the pipe is not soiled by accumu-
lated dirt. If necessary, clean the pipe at regular
intervals.
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1 Venting hole
1