Process; Process Temperature Range; Process Pressure Range; Dielectric Constant (Dc) - Endress+Hauser Levelflex FMP51 Modbus Technical Information

Process temperature range

Process pressure range

Dielectric constant (DC)

Expansion of the rope probes
through temperature
50

Process

The maximum permitted temperature at the process connection is determined by the O-ring version
ordered:
Device O-ring material
FMP51 FKM (Viton GLT 37559)
EPDM (70C4 pW FKN or E7515) –40 to +120 °C (–40 to +248 °F)
FFKM (Kalrez 6375)
FVMQ (FVMQ 70C79)
1) Recommended for steam applications
2) Not recommended for saturated steam above 150 °C (302 °F). Use FMP54 instead.
With uncoated probes, the medium temperature may be higher, under the condition that the
maximum process temperature specified in the table above is not exceeded at the process
connection.
However, when using rope probes, the stability of the probe rope is reduced by structural
changes at temperatures above 350 °C (662 °F).
Device Process pressure
FMP51 –1 to 40 bar (–14.5 to 580 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 100 °F.
Pay attention to pressure-temperature dependencies.
Please refer to the following standards for the pressure values permitted for higher
temperatures:
• EN 1092-1: 2007 Tab. G.4.1-x
With regard to their temperature stability properties, the materials 1.4435 and 1.4404 are
grouped under 13E0 in EN 1092-1:2007 Tab. G.3.1-1. The chemical composition of the two
materials can be identical.
• ASME B 16.5a - 2013 Tab. 2-2.2 F316
• ASME B 16.5a - 2013 Tab. 2.3.8 N10276
• JIS B 2220
• Coax probes: DC (ε ) ≥ 1.4
r
• Rod and rope probe: DC (ε
Elongation through temperature increase from 30 °C (86 °F) to 150 °C (302 °F): 2 mm / m rope
length
Process temperature
–30 to +150 °C (–22 to +302 °F)
–40 to +150 °C (–40 to +302 °F)
only in combination with feature 610 "Accessory
Mounted" option model NC "Gas-tight feed through"
1)
–20 to +200 °C (–4 to +392 °F)
–50 to 130 °C (–58 to 260 °F)
) ≥ 1.6 (when installing in pipes DN ≤ 150 mm (6 in): DC (ε
r
Levelflex FMP51 Modbus
Approval
2)
) ≥ 1.4)
r
Endress+Hauser