Levelflex FMP56, FMP57
Endress+Hauser 85
3-point linearity protocol
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:
A0021843
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
Rod probe Rope probe
LN ≤ 6 m (20 ft)
Rope probe
LN > 6 m (20 ft)
Position of 1st measuring point A = 350 mm (13.8 in) A = 350 mm (13.8 in) A = 350 mm (13.8 in)
Position of 2nd measuring
point
centrally between 1st and 3rd
measuring point
centrally between 1st and 3rd
measuring point
centrally between 1st and 3rd
measuring point
Position of 3rd measuring point C = 250 mm (9.84 in) C = 500 mm (19.7 in) A+B = 5 500 mm (217 in)
Minimum measuring range B ≥ 400 mm (15.7 in) B ≥ 400 mm (15.7 in) B ≥ 400 mm (15.7 in)
Minimum length of probe LN ≥ 1 000 mm (39.4 in) LN ≥ 1 250 mm (49.2 in) LN ≥ 1 250 mm (49.2 in)
The position of the measuring points may vary by ±1 cm (±0.04 in).
The linearity check is performed with the complete device and under reference conditions.
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