Endress+Hauser Levelflex FMP51 Technical Information page 111

Levelflex FMP51, FMP52, FMP54
3-point linearity protocol
Rod or coax probe
LN ≤ 6 m (20 ft)
Position of 1st measuring • FMP51/FMP52/FMP54 withoput gas phase compensation/
point
• FMP54 with gas phase compensation, L
• FMP54 with gas phase compensation, L
Position of 2nd measuring centrally between 1st and
point 3rd measuring point
Position of 3rd measuring measured from the
point bottom end of the probe:
C = 250 mm (9.84 in)
Minimum measuring B ≥ 400 mm (15.7 in)
range
Minimum length of probe LN ≥ 1 000 mm (39.4 in)
1) also valid for divisible rods
Endress+Hauser
The following notes must be taken into account if option F3 ("3 point linearity protocol") has
been selected in feature 550 ("Calibration").
Depending on the probe the 3 points of the linearity protocol are defined as follows:
A Distance from reference point R to first measuring point
B Measuring range
C Distance from end of probe to third measuring point
LN Length of probe
R Reference point of the measurement
1 First measuring point
2 Second measuring point (centrally between first and third measuring point)
3 Third measuring point
1)
Divisible rod probe
LN > 6 m (20 ft)
FMP55:
A = 350 mm (13.8 in)
A = 600 mm (23.6 in)
A = 850 mm (33.5 in)
centrally between 1st and 3rd
measuring point
measured from the top end of the
probe:
A+B = 5 750 mm (226 in)
B ≥ 400 mm (15.7 in)
LN ≥ 1 000 mm (39.4 in)
The position of the measuring points may vary by ±1 cm (±0.04 in).
• For rod and rope probes the linearity check is performed with the complete device.
• For divisible rod probes a reference probe is used instead of the original one.
• For coax probes the electronics is mounted to a reference rod probe and the linearity check is
performed to this configuration.
• The linearity is checked under reference conditions.
R
1
2
3
Rope probe
LN ≤ 6 m (20 ft)
A = 350 mm (13.8 in)
= 300 mm (11 in):
ref
= 550 mm (21 in):
ref
centrally between 1st and
3rd measuring point
measured from the
bottom end of the probe:
C = 500 mm (19.7 in)
B ≥ 400 mm (15.7 in)
LN ≥ 1 250 mm (49.2 in)
1
2
3
Rope probe
LN > 6 m (20 ft)
A = 350 mm (13.8 in)
centrally between 1st and
3rd measuring point
measured from the top
end of the probe:
A+B = 5 500 mm (217 in)
B ≥ 400 mm (15.7 in)
LN ≥ 1 250 mm (49.2 in)
A0021843
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