Installation Conditions - Endress+Hauser Prosonic M FMU40 Brief Operating Instructions

Prosonic M FOUNDATION Fieldbus
2.3

Installation conditions

2.3.1 Installation conditions for level measurements
2
1
1/3D
• 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 1/3 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 α. 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 α.
α
Sensor
FMU40 11°
FMU41 11°
FMU42 9°
FMU43 6°
FMU44 11 °
Endress+Hauser
3 4
5
D
6
L
max
5 m (16 ft)
8 m (26 ft)
10 m (33 ft)
15 m (49 ft)
20 m (66 ft)
L
a
r
r
max
0.48 m (1.6 ft)
0.77 m (2.5 ft)
0.79 m (2.6 ft)
0.79 m (2.6 ft)
1.93 m (6.3 ft)
Mounting
7
L00-FMU4xxxx-17-00-00-de-005
7