Performance characteristics. ENDRESS+HAUSER Levelflex FMP55

Levelflex FMP55

Reference operating conditions

Maximum measured error

Performance characteristics

• Temperature = +24 °C (+75 °F) ±5 °C (±9 °F)

• Pressure = 960 mbar abs. (14 psia) ±100 mbar (±1.45 psi)

• Humidity = 60 % ±15 %

• Reflection factor ≥ 0,8 (surface of the water for coax probe, metal plate for rod and rope probe with min.

1 mm (0.04 in) diameter)

• Flange for rod or rope probe ³ 300 mm (12 in) diameter

• Distance to obstacles ³ 1 m (40 in)

• For interface measurement:

– Coax probe

– DC of the lower medium = 80 (water)

– DC of the upper medium = 2 (oil)

Typical data under reference operating conditions: DIN EN 61298-2, percentage values in relation to the span.

Output: digital

Sum of non-linearity, nonrepeatability and hysteresis

Level measurement:

Measuring range up to 10 m (33 ft): ±2 mm (0.08 in)

Offset / Zero

Interface measurement:

• Measuring range up to 500 mm (19.7 in): ±20 mm (0.79 in)

• Measuring range >500 mm (19.7 in): ±10 mm (0.39 in)

• If the thickness of the interface is <100 mm (3.94 in):

±40 mm (1.57 in)

±4 mm (0.16 in)

1) Add error of the analogous value to the digital value.

analog

1)

±0.02 %

±0.03 %

If the reference conditions are not met, the offset/zero point arising from the mounting situation may be up to

±12 mm (0.47 in) for rope and rod probes. This additional offset/zero point can be compensated for by entering a correction (parameter "level correction") during commissioning.

Differing from this, the following measuring error is present in the vicinity of the lower probe end:

rod probe and coax probe

80

60

40

20

0

-20

-40

-60

-80

0

DC = 2

DC > 7

50 100 150 200 250

distance from probe end [mm]

300

rope probe

80

60

40

DC > 7

20

0

-20

-40

-60

-80

0 50 100 150 200 250 300

distance from probe end [mm]

A0014154-EN

If for rope probes the DC value is less than 7, then measurement is not possible in the area of the straining weight (0 to 250 mm from end of probe; lower blocking distance).

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Levelflex FMP55

Differing from this, the following measuring error is present in the vicinity of the upper probe end

(rod/rope only):

Resolution

Reaction time

Influence of ambient temperature

R

40 mm

30 mm

20 mm

10 mm

D

2 mm

0 mm

- 2 mm

- 10 mm

- 20 mm

- 30 mm

- 40 mm

DC = 2

DC > 7

100 mm 200 mm

A0015091

D Sum of non-linearity, non-repeatability and hysteresis

R Reference point of measurement

DC Dielectric constant

• digital: 1 mm

• analog: 1 mA

The reaction time can be parametrized. The following step response times (as per DIN EN 61298-2)

3)

if the damping is switched off:

are valid

Probe length

< 10 m (33 ft)

Level measurement

Sampling rate

3.6 measurements/second

Step response time

< 0.8 s

Probe length

< 10 m (33 ft)

Interface measurement

Sampling rate

³ 1.1 measurements/second

The measurements are carried out in accordance with EN 61298-3

• digital (HART, PROFIBUS PA): average T

K

= 0.6 mm/10 K

• analog (current output):

– zero point (4 mA): average T

– span (20 mA): average T

K

K

= 0.02 %/10 K

= 0.05 %/10 K

Step response time

< 2.2 s

3) According to DIN EN 61209-2 the response time is the time which passes after a sudden change of the input signal until the output signal for the first time assumes 90% of the steady-state value.

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