+GF+ 2298 Bedienungsanleitung Seite 35

Instruction manual
5.6.4 P26/27 Level tracking speed
FACTORY DEFAULT: 600 m/h (1 970 ft / h)
The level tracking speed is the fastest level change speed that the device can continuously track. The device will only follow a level
change slower than the set value. If the device senses a level signal change faster than this value, it assumes it is the result of a
measurement error (e.g., condensation), it will not accept it, and the outputs will show the last valid value. Suppose this resulted from
an incorrect measurement, and the result of the next measurement is plausible based on the set maximum speed. Then hold is can-
celed, and the actual measured level takes effect. If the rapid change in level was actually real, the device recalculates with each
measurement whether the currently measured level is within the range determined by the product of the tracking speed and the
elapsed time. If it is within the range, it cancels the hold, and the output adjusts to the new value according to the set damping para-
meter. Setting the level tracking speed is important when technological processes, especially during filling or discharging, produce
interfering factors (e.g., ripples, foaming) that affect measurement stability. The set level tracking speed must be higher than the
maximum filling/discharging speed prescribed by the technology. By entering it correctly, measurements during filling and dischar-
ging become more reliable.
Note: In tanks with a conical or pyramidal bottom, the level change rate at the bottom of the tank increases significantly due to the
shape of the tank.
In this parameter pair, the filling and discharging speed can be set separately:
P26 – Level rising rate (filling speed)
•
P27 – Level descent rate (emptying speed)
•
The parameter's unit of measure: metric: [m/h]; US: [ft/h].
P26/27 a
Measurement optimalization ➙ Level ➙
EView2
➙ Level elevation rate (filling speed)
➙ Level descent rate (emptying speed)
5.6.5 P28 Measurement loss handling
FACTORY DEFAULT: 0010
P25 a
Measurement optimalization ➙ Measurement loss
EView2
management ➙ Echo loss handling
a Echo loss ("no-Echo") handling
0 Hold for the period in the P28b decade.
1 Hold (indefinitely)
2 Filling simulation (at detected speed)
3 Filling simulation (at P26/P27 maximum speed)
4 Tank empty (DIST = maximum / LEV = 0)
5 Tank full (DIST minimum / LEV = maximum)
Type 2298 80 GHz Radar Level Sensor
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