Special Mounting Instructions - Endress+Hauser Micropilot FMR60B Technical Information

Micropilot FMR60B HART
Special mounting
instructions
Endress+Hauser
Measurement through a ball valve
• Measurements can be performed through an open full bore ball valve without any problems.
• At the transitions, no gap exceeding 1 mm (0.04 in) may be left.
• Opening diameter of ball valve must always correspond to the pipe diameter; avoid edges and
constrictions.
External measurement through plastic cover or dielectric windows
• Dielectric constant of medium: ε
• The distance from the tip of the antenna to the tank should be approx. 100 mm (4 in).
• Avoid installation positions where condensate or buildup can form between the antenna and the
vessel
• In the case of outdoor installations, ensure that the area between the antenna and the tank is
protected from the weather
• Do not install any fittings or attachments between the antenna and the tank that could reflect the
signal
The thickness of the tank ceiling or the dielectric window depends on the ε
The material thickness can be a full multiple of the optimum thickness (table); it is important to
note, however, that the microwave transparency decreases significantly with increasing material
thickness.
Optimum material thickness
Material
PE; ε 2.3
r
PTFE; ε 2.1
r
PP; ε 2.3
r
Perspex; ε 3.1
r
Container with heat insulation
≥ 10
r
Optimum material thickness
1.25 mm (0.049 in)
1.30 mm (0.051 in)
1.25 mm (0.049 in)
1.10 mm (0.043 in)
1
2
A0034564
of the material.
r
A0046566
25