Levelflex M FMP40 - Process Centre Of Excellence.

Technical data Levelflex M FMP40 with HART/4...20 mA
Cleaning the probe Depending on the application, soilings or sediments can accumulate on the probe. A thin, even layer
only influences measurement slightly. Thick layers can dampen the signal and then reduce the
measuring range. Heavy, uneven build-up, adhesion e.g. through crystallisation, can lead to
incorrect measurement. In this case, we recommend that you use a non-contact measuring
principle, or check the probe regularly for soiling
Electromagnetic
compatibility (EMC)
When installing the probes in metal and concrete tanks and when using a coax probe:
• Interference Emission to EN 61326, Electrical Equipment Class B
• Interference immunity to EN 61326, Annex A (Industrial area) and NAMUR Recommendation
NE 21 (EMC)
The measured value can be affected by strong electromagnetic fields when installing rod and rope
probes without a shielding/metallic wall, e.g. plastic, and in wooden silos.
• Interference emission to EN 61326, Class A equipment.
• Interference immunity: the measured value can be affected by strong electromagnetic fields.
10.1.5 Operating conditions: Process
Process temperature range The maximum permitted temperature at the process connection (see Figure for measuring point) is
determined by the O-ring version ordered:
! Note!
! Note!
O-ring-material min. Temperature max. Temperature 1)
FKM (Viton) -30 °C/-22 °F +150 °C/302 °F
EPDM -40 °C/-40 °F +120 °C/248 °F
FFKM (Kalrez) -5 °C/23 °F 2)
+150 °C/302 °F
1) For PA coated probes, the maximal admissible temperature ist 100 °C (212 °F).
measured
here
2) The min. temperature of FFKM may be -15 °C (5 °F) if the max. temperature of +80 °C (176 °F) is not
exceeded.
The medium temperature can be higher.
However, when using rope probes the stability of the probe rope is reduced by structural changes
at temperatures over 350 °C.
The bare metallic probes are only insulated in the area of the bushing. Thus there is no danger of
electrostatic charging. The PA-coated rope has been tested and there is no dangerous electrostatic
charging. As a result, there are no restrictions on use in Ex-areas for any of the probes.
Process pressure All models: -1...40 bar/585,9 psi.
This range may be reduced by the selected process connection.
The pressure rating (PN) specified on the flanges refers to a reference temperature of 20 °C, for
ASME flanges to 100 °F.
Note!
All Levelflex probes have two levels of sealing. There is an O-ring seal and a moulded seal behind
that.
96 Endress + Hauser