Endress+Hauser Levelflex M FMP40 - Page 104

Technical data Levelflex M FMP40 FOUNDATION Fieldbus
104 Endress+Hauser
10.1.6 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!
• 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.
The specified 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 100 °F.
Observe pressure-temperature dependency.
Please refer to the following standards for the pressure values permitted for higher temperatures:
• EN 1092-1: 2001 Tab.18
With regard to their temperature stability properties, the materials 1.4404 and 1.4435 are
grouped under 13E0 in EN 1092-1 Tab.18. The chemical composition of the two materials can
be identical.
• ASME B 16.5a - 1998 Tab. 2-2.2 F316
• ASME B 16.5a - 1998 Tab. 2.3.8 N10276
• JIS B 2220
!
Note!
All Levelflex probes have two levels of sealing. There is an O-ring seal and a moulded seal behind
that.
Dielectric constant • with coax probe:
ε
r ≥ 1,4
• Rod and rope probe:
ε
r ≥ 1,6
Extension of the rope probes
through tension and
temperaturer
4 mm rope:
• Elongation through tension: at max. permitted tensile load (12 KN): 11 mm / m rope length
• Elongation through temperature increase from 30 °C to 150 °C: 2 mm / m rope length
6 mm rope:
• Elongation through tension: at max. permitted tensile load (30 KN): 13 mm / m rope length
• Elongation through temperature increase from 30 °C to 150 °C: 2 mm / m rope length
O-ring-material min. Temperature max. Temperature
1)
1) For PA coated probes, the maximal admissible temperature ist 100 °C (212 °F).
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)
2) The min. temperature of FFKM may be -15 °C (5 °F) if the max. temperature of +80 °C (176 °F) is not exceeded.
+150 °C/302 °F
measured
here