Liquicap M FMI51 HART Technical data
Endress+Hauser 87
12.4.7 Response time
FEI50H (4 to 20 mA / HART version 5)
The response time affects the speed at which the display and the current output react to
changes in the level.
The factory setting for time constant τ = 1 s; 0 to 60 s can be set.
12.4.8 Accuracy of factory calibration
Empty calibration (0 %) and full calibration (100 %):
• probe length < 2 m (6.6 ft)
≤ 5 mm (0.2 in)
• probe length > 2 m (6.6 ft)
approximately ≤ 2 %
Reference conditions for the factory calibration:
• medium conductivity ≥ 100 µS/cm
• minimum distance to tank wall = 250 mm (9.84 in)
A0040419
Unit of measurement mm (in)
L1 Measuring range from the tip of the probe to the process connection
L3 The inactive length
In an installed state, recalibration is only necessary when:
• the 0 % or the 100 % values have to be adjusted specifically for the customer
• the liquid is not conductive
• the probe distance to the tank wall is < 250 mm (9.84 in)
12.4.9 Resolution
Analog in % (4 to 20 mA)
• 11 bit/ 2 048 steps, 8 µA
• the resolution of the electronics can be directly converted to units of length of the probe
e.g. rod probe length is 1 000 mm, resolution equals 1 000 mm/2048 = 0.48 mm
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